CN115838270B - Marble-imitated light mirror concrete and preparation method thereof - Google Patents
Marble-imitated light mirror concrete and preparation method thereof Download PDFInfo
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of building materials, in particular to marble-imitated light mirror concrete and a preparation method thereof. The marble-like light mirror concrete comprises the following raw material components: cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer; the components of the modified diatom ooze comprise black diatom ooze powder, a modifier, carbon nanofibers, latex powder and ethylene bis stearamide. According to the application, the raw material components such as the functional raw materials, the light powder, the aggregate and the like are mixed, so that the problem of high apparent density of the concrete is effectively solved, the apparent density of the concrete is reduced, and the light effect is achieved; and the surface texture and durability of the concrete are improved, so that the surface compactness, color uniformity and smoothness of the concrete are improved.
Description
Technical Field
The application relates to the technical field of building materials, in particular to marble-imitated light mirror concrete and a preparation method thereof.
Background
The mirror concrete has the characteristics of accurate geometric dimension, smooth and straight column edges, compact inside, flat surface, smooth finish, consistent color, fine and exquisite texture, dense and nearly homogeneous marble texture and the like, and forms the unique mirror decoration aesthetic feeling.
Mirror concrete represents the highest level of concrete construction in China at present, the quality of appearance is exclusionary, but the requirements on processing, supporting and reinforcing a template, raw materials and mixing proportion of concrete and the requirements on the concrete construction process are very high, and the natural cost is relatively high. Because the control requirements of all links are strict, the implementation personnel of all links are required to have higher technical level, and the quality of any link is reduced due to the error. At present, concrete has the defect of larger apparent density, the appearance of the concrete is difficult to reach the surface texture of the required mirror surface concrete, and the concrete is inconvenient to carry and decorate, so that the decoration difficulty is greatly increased.
The difficulty in preparing mirror concrete is: how to pour the original rough concrete surface into the mirror-like brightness with less air holes, and can completely reflect the opposite things. To solve the above problems, it is necessary to improve the apparent mass of the mirror concrete by optimizing the form, raw materials, mix ratio, pouring vibration, etc. of the mirror concrete, so as to achieve the effects of densification and weight reduction on the concrete surface, which is a technical problem that the skilled person is working to solve.
Disclosure of Invention
In order to solve the problems in the background art, the application provides marble-imitated light mirror concrete, which has the following technical scheme:
the marble-like light mirror concrete comprises the following raw material components: cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer; the components of the modified diatom ooze comprise black diatom ooze powder, a modifier, carbon nanofibers, latex powder and ethylene bis stearamide; the mass ratio of the black diatom ooze powder to the modifier to the carbon nano fiber to the latex powder to the ethylene bis-stearamide is (40-50) to (0.025-0.5) to (10-15) to (0.001-0.3) to (0.2-1).
In one embodiment, the modified diatom ooze is prepared by adding mixed powder into a carbon nanofiber aqueous solution, mixing, and drying; the mixed powder comprises black diatom ooze powder, latex powder, ethylene bis-stearamide and a modifier.
In one embodiment, the specific surface area of the black diatom ooze powder is 700m 2 /kg～800m 2 /kg。
In one embodiment, the cement is 250 to 300 parts, the modified diatom ooze is 15 to 40 parts, the fly ash is 40 to 75 parts, the silica fume is 25 to 40 parts, the floating beads are 100 to 150 parts, the expanding agent is 15 to 30 parts, the coarse aggregate is 500 to 560 parts, the fine aggregate is 700 to 750 parts, the water is 150 to 170 parts, and the polycarboxylic acid high-performance water reducer is 6 to 9 parts.
In an embodiment, the modifier is one or more of a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent.
In an embodiment, the carbon nanofibers are one or more of carbon nanofibers and vapor grown carbon nanofibers.
In one embodiment, the cement is one or more of p.o42.5 cement, p.o52.5 cement, p.o42. R, P.o52.r5 cement; the fly ash is one or a combination of more of class I fly ash and class I I fly ash; the silica fume is one or a combination of more of SF 90-grade silica fume and SF 94-grade silica fume.
In an embodiment, the expanding agent is one or more of a concrete type I expanding agent, a concrete type I I expanding agent and a plastic expanding agent; the coarse aggregate is one or a combination of more of ceramsite with the grain size of 5-10 mm and ceramsite with the grain size of 10-20 mm; the fine aggregate is one or a combination of more of ceramic sand with the grain diameter of 0-5 mm and machine-made sand with the grain diameter of 0-5 mm.
The application also provides a preparation method of the marble-imitated light mirror concrete, which comprises the following preparation steps:
weighing the following raw material components: weighing cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer according to a certain weight part;
uniformly mixing coarse aggregate and fine aggregate to obtain a mixture A; uniformly mixing cement, modified diatom ooze, fly ash, silica fume, floating beads and an expanding agent to obtain a mixture B; uniformly mixing a polycarboxylic acid high-performance water reducer and water to obtain a mixed solution C;
uniformly mixing the mixture A and the mixture B, and then adding the mixed solution C to uniformly mix to obtain a light mirror surface bare concrete mixture;
pouring the obtained light mirror concrete mixture into a mould, stirring, inserting and tamping after pouring is completed until the surface is flat;
and waiting for a certain time after pouring is completed, and removing the die to obtain the marble-imitated light mirror concrete.
In one embodiment, the mold is formed by splicing templates with smooth and flat surfaces and low water absorption.
Compared with the prior art, the application has the following technical effects:
according to the application, the raw material components such as the functional raw materials, the light powder, the aggregate and the like are mixed, so that the problem of high apparent density of the concrete is effectively solved, the apparent density of the concrete is reduced, the light effect is achieved, the manual transportation and installation can be facilitated, the labor cost is reduced, and the economical efficiency and the practicability are realized; and the surface texture and durability of the concrete are improved, so that the surface compactness, color uniformity and smoothness of the concrete are improved.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the following description will be made in connection with the technical solutions in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a preparation method of marble-like light mirror concrete, which comprises the following preparation steps:
1. the mold is assembled by the mold plates, hot melt adhesive is sprayed at the joint, the periphery of the mold plates is bolted by steel rings, and the joint is required to be strictly and smoothly ensured.
Preferably, the die is formed by splicing templates with smooth and flat surfaces and low water absorption. The template can be one or a plurality of combinations of a glass template and a plastic template (such as an acrylic plate), wherein the acrylic plate is used as a better choice, has a smooth and flat surface structure, is poor in water absorbability, is not easy to combine with concrete slurry, and is strong in plasticity, large in template modeling variability, simple to process, good in acid and alkali resistance and capable of being repeatedly used.
2. Pre-wetting coarse aggregate and fine aggregate in advance, soaking in water for 12-24 h, and filtering to dry for later use.
3. Weighing the following raw materials: weighing cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer according to a certain weight portion. Wherein the mass of the coarse aggregate and the fine aggregate is obtained by subtracting the water consumption from the water content of the coarse aggregate and the fine aggregate by an equal amount.
4. Mixing coarse aggregate and fine aggregate, and stirring uniformly to form a mixture A; mixing cement, modified diatom ooze, fly ash, silica fume, floating beads and an expanding agent, and uniformly stirring to form a mixture B; and mixing the polycarboxylic acid high-performance water reducer with water, and uniformly stirring to obtain a mixed solution C.
5. And pouring the mixture A and the mixture B into a stirrer to stir for 60-90 s, adding the mixed solution C, and stirring for 240-300 s to obtain the light mirror-surface bare concrete mixture.
6. And uniformly pouring the light mirror concrete mixture into a mold, stirring, and tamping by using a tamping rod until the surface is flat.
7. And placing a steel wire mesh, keeping a certain depth from the upper surface of the concrete mixture, and finally covering with a plastic film.
8. And after pouring is finished and a certain period of time is waited, removing the template of the mould, and spraying curing agent curing the upper surface of the concrete to prepare the marble-like light mirror concrete.
The formula of the concrete is as follows: the cement mortar is prepared from, by weight, 250-300 parts of cement, 15-40 parts of modified diatom ooze, 40-75 parts of fly ash, 25-40 parts of silica fume, 100-150 parts of floating beads, 15-30 parts of an expanding agent, 500-560 parts of coarse aggregate, 700-750 parts of fine aggregate, 150-170 parts of water and 6-9 parts of a polycarboxylic acid high-performance water reducer.
The application also provides a preferred embodiment of the preparation method of the modified diatom ooze, which comprises the following specific steps:
(1) Pouring the carbon nanofiber into water, and stirring for 30 min-45 min while performing ultrasonic treatment to obtain a carbon nanofiber aqueous solution.
(2) Grinding black diatom ooze powder to specific surface area of 700m 2 /kg～800m 2 And (3) carrying out electric stirring and mixing on the weighed black diatom ooze fine powder, the emulsion powder, the ethylene bis-stearamide and the modifier for 10-20 min to obtain mixed powder.
(3) And slowly and uniformly pouring the mixed powder into the stirring carbon nanofiber aqueous solution, continuously stirring for a certain period of time after the mixed powder is completely poured, and drying, breaking and grinding to obtain the modified diatom ooze for later use.
Wherein the mass ratio of the black diatom ooze powder to the modifier to the carbon nano fiber to the latex powder to the ethylene bis-stearamide is (40-50) to (0.025-0.5) to (10-15) to (0.001-0.3) to (0.2-1).
The application also provides the formulations (unit: parts by weight) of the examples and comparative examples shown in table 1:
TABLE 1
Specifically, the preparation processes of the examples, the comparative examples and the comparative examples provided by the application are as follows:
example 1
In this embodiment, each raw material composition includes, in parts by weight: 300 parts of cement, 15 parts of modified diatom ooze, 50 parts of fly ash, 30 parts of silica fume, 100 parts of floating beads, 15 parts of expanding agent, 560 parts of coarse aggregate, 700 parts of fine aggregate, 150 parts of water and 9 parts of polycarboxylic acid high-performance water reducer.
Wherein the mass ratio of the components of the black diatom ooze powder, the modifier, the carbon nanofiber, the latex powder and the ethylene bis stearamide in the modified diatom ooze is 50:0.5:15:0.2:0.5. Wherein the modifier is kh560 silane coupling agent, and the carbon nanofiber is CNF carbon nanofiber.
The preparation method of the modified diatom ooze comprises the following steps:
(1) Pouring the carbon nanofiber into water, and stirring for 30 min while performing ultrasonic treatment to obtain a carbon nanofiber aqueous solution.
(2) Grinding black diatom ooze powder to specific surface area of 750m 2 And (3) carrying out electric stirring and mixing on the weighed black diatom ooze fine powder, the emulsion powder, the ethylene bis stearamide and the modifier for 20 min to obtain mixed powder B.
(3) And slowly and uniformly pouring the mixed powder B into the stirring carbon nanofiber aqueous solution, and continuously stirring for 24 hours after the powder is completely poured, drying, breaking, grinding and reserving.
The cement is P.O52.5 ordinary Portland cement; the fly ash is I-grade fly ash; the silica fume is SF94 grade silica fume; the expansion agent is a concrete I-type expansion and plastic expansion agent, and the mass ratio is 50:1; the coarse aggregate is 5 mm-10 mm haydite with bulk density up to 1000kg/m 3 The barrel pressure strength is 6.5MPa; the fine aggregate is ceramic sand with the fineness modulus of 2.7, the mud content of 0.3% and the bulk density of 900kg/m 3 . The polycarboxylic acid high-performance water reducer is a polycarboxylic acid water reducer Poi nt-50ECS special for Jack mirror concrete, the water reduction rate is up to 30%, the polycarboxylic acid high-performance water reducer is mainly formed by compounding polycarboxylic acid mother liquor, slump retaining agent, air entraining agent, defoaming agent, retarder, water retaining agent, viscosity regulator and water, the polycarboxylic acid high-performance water reducer can be obtained through market, and specific components are not tired.
In this embodiment, a preparation method and a construction process of a marble-like light mirror concrete, which includes the following preparation steps:
(1) And assembling an acrylic mold, spraying hot melt adhesive at the joint, and bolting the periphery by using a steel ring, wherein the joint is required to be tight and smooth.
(2) The coarse aggregate and the fine aggregate are subjected to pre-wetting treatment in advance, soaked in water for 24 hours, and filtered to be dried for later use.
(3) Weighing the following raw materials: weighing cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer according to a certain weight portion. Wherein the mass of the coarse aggregate and the fine aggregate is obtained by subtracting the water consumption from the water content of the coarse aggregate and the fine aggregate.
(4) Mixing coarse aggregate and fine aggregate, and stirring uniformly to form a mixture A; mixing cement, modified diatom ooze, fly ash, silica fume, floating beads and an expanding agent, and uniformly stirring to form a mixture B; and mixing the polycarboxylic acid high-performance water reducer with water, and uniformly stirring to obtain a mixed solution C.
(4) And pouring the mixture A and the mixture B into a stirrer to stir for 60s, adding the mixed solution C, and stirring for 300s to obtain the light mirror-surface bare concrete mixture.
(5) And uniformly pouring the light mirror concrete mixture into a mold, stirring, and tamping by using a tamping rod until the surface is flat.
(6) And placing the steel wire mesh sheet at a depth of 20mm from the upper surface, and finally covering with a plastic film.
(7) And after pouring for 72 hours, dismantling the acrylic template, and spraying a curing agent for curing the upper surface.
Example 2
In this embodiment, each raw material composition includes, in parts by weight: 275 parts of cement, 25 parts of modified diatom ooze, 65 parts of fly ash, 30 parts of silica fume, 100 parts of floating beads, 15 parts of expanding agent, 530 parts of coarse aggregate, 725 parts of fine aggregate, 160 parts of water and 8 parts of polycarboxylic acid high-performance water reducer.
Wherein the mass ratio of the components of the black diatom ooze powder, the modifier, the carbon nanofiber, the latex powder and the ethylene bis-stearamide in the modified diatom ooze is 50:0.5:15:0.2:0.5. Wherein the modifier is kh560 silane coupling agent, and the carbon nanofiber is CNF carbon nanofiber.
The preparation method of the modified diatom ooze comprises the following steps:
(1) Pouring the carbon nanofiber into water, and stirring for 30 min while performing ultrasonic treatment to obtain a carbon nanofiber aqueous solution.
(2) Grinding black diatom ooze powder to specific surface area of 750m 2 And (3) carrying out electric stirring and mixing on the weighed black diatom ooze fine powder, the emulsion powder, the ethylene bis stearamide and the modifier for 20 min to obtain mixed powder B.
(3) And slowly and uniformly pouring the mixed powder B into the stirring carbon nanofiber aqueous solution, and continuously stirring for 24 hours after the powder is completely poured, drying, breaking, grinding and reserving.
The cement is P.O52.5 ordinary Portland cement; the fly ash is I-grade fly ash; the silica fume is SF94 grade silica fume; the expansion agent is a concrete I-type expansion and plastic expansion agent, and the mass ratio is 50:1; the coarse aggregate is 5 mm-10 mm haydite with bulk density up to 1000kg/m 3 The barrel pressure strength is 6.5MPa; the fine aggregate is ceramic sand with the fineness modulus of 2.7, the mud content of 0.3% and the bulk density of 900kg/m 3 。
The polycarboxylic acid high-performance water reducer is a polycarboxylic acid water reducer Poi nt-50ECS special for Jack mirror concrete, the water reduction rate is up to 30%, the polycarboxylic acid high-performance water reducer is mainly formed by compounding polycarboxylic acid mother liquor, slump retaining agent, air entraining agent, defoaming agent, retarder, water retaining agent, viscosity regulator and water, the polycarboxylic acid high-performance water reducer can be obtained through market, and specific components are not tired.
In this embodiment, a preparation method and a construction process of a marble-like light mirror concrete, which includes the following preparation steps:
(1) And assembling an acrylic mold, spraying hot melt adhesive at the joint, and bolting the periphery by using a steel ring, wherein the joint is required to be tight and smooth.
(2) The coarse aggregate and the fine aggregate are subjected to pre-wetting treatment in advance, soaked in water for 24 hours, and filtered to be dried for later use.
(3) Weighing the following raw materials: weighing cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer according to a certain weight portion. Wherein the mass of the coarse aggregate and the fine aggregate is obtained by subtracting the water consumption from the water content of the coarse aggregate and the fine aggregate.
(4) Mixing coarse aggregate and fine aggregate, and stirring uniformly to form a mixture A; mixing cement, modified diatom ooze, fly ash, silica fume, floating beads and an expanding agent, and uniformly stirring to form a mixture B; and mixing the polycarboxylic acid high-performance water reducer with water, and uniformly stirring to obtain a mixed solution C.
(4) And pouring the mixture A and the mixture B into a stirrer to stir for 60s, adding the mixed solution C, and stirring for 300s to obtain the light mirror-surface bare concrete mixture.
(5) And uniformly pouring the light mirror concrete mixture into a mold, stirring, and tamping by using a tamping rod until the surface is flat.
(6) And placing the steel wire mesh sheet at a depth of 20mm from the upper surface, and finally covering with a plastic film.
(7) And after pouring for 72 hours, dismantling the acrylic template, and spraying a curing agent for curing the upper surface.
Example 3
In this embodiment, each raw material composition includes, in parts by weight: 250 parts of cement, 40 parts of modified diatom ooze, 75 parts of fly ash, 30 parts of silica fume, 100 parts of floating beads, 15 parts of expanding agent, 500 parts of coarse aggregate, 750 parts of fine aggregate, 170 parts of water and 6 parts of polycarboxylic acid high-performance water reducer.
Wherein the mass ratio of the components of the black diatom ooze powder, the modifier, the carbon nanofiber, the latex powder and the ethylene bis-stearamide in the modified diatom ooze is 50:0.5:15:0.2:0.5. Wherein the modifier is kh560 silane coupling agent, and the carbon nanofiber is CNF carbon nanofiber.
The preparation method of the modified diatom ooze comprises the following steps:
(1) Pouring the carbon nanofiber into water, and stirring for 30 min while performing ultrasonic treatment to obtain a carbon nanofiber aqueous solution.
(2) Grinding black diatom ooze powder to obtain powderSpecific surface area 750m 2 And (3) carrying out electric stirring and mixing on the weighed black diatom ooze fine powder, the emulsion powder, the ethylene bis stearamide and the modifier for 20 min to obtain mixed powder B.
(3) And slowly and uniformly pouring the mixed powder B into the stirring carbon nanofiber aqueous solution, and continuously stirring for 24 hours after the powder is completely poured, drying, breaking, grinding and reserving.
The cement is P.O52.5 ordinary Portland cement; the fly ash is I-grade fly ash; the silica fume is SF94 grade silica fume; the expansion agent is a concrete I-type expansion and plastic expansion agent, and the mass ratio is 50:1; the coarse aggregate is 5 mm-10 mm haydite with bulk density up to 1000kg/m 3 The barrel pressure strength is 6.5MPa; the fine aggregate is ceramic sand with the fineness modulus of 2.7, the mud content of 0.3% and the bulk density of 900kg/m 3 。
The polycarboxylic acid high-performance water reducer is a polycarboxylic acid water reducer Poi nt-50ECS special for Jack mirror concrete, the water reduction rate is up to 30%, the polycarboxylic acid high-performance water reducer is mainly formed by compounding polycarboxylic acid mother liquor, slump retaining agent, air entraining agent, defoaming agent, retarder, water retaining agent, viscosity regulator and water, the polycarboxylic acid high-performance water reducer can be obtained through market, and specific components are not tired.
In this embodiment, a preparation method and a construction process of a marble-like light mirror concrete, which includes the following preparation steps:
(1) And assembling an acrylic mold, spraying hot melt adhesive at the joint, and bolting the periphery by using a steel ring, wherein the joint is required to be tight and smooth.
(2) The coarse aggregate and the fine aggregate are subjected to pre-wetting treatment in advance, soaked in water for 24 hours, and filtered to be dried for later use.
(3) Weighing the following raw materials: weighing cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer according to a certain weight portion. Wherein the mass of the coarse aggregate and the fine aggregate is obtained by subtracting the water consumption from the water content of the coarse aggregate and the fine aggregate.
(4) Mixing coarse aggregate and fine aggregate, and stirring uniformly to form a mixture A; mixing cement, modified diatom ooze, fly ash, silica fume, floating beads and an expanding agent, and uniformly stirring to form a mixture B; and mixing the polycarboxylic acid high-performance water reducer with water, and uniformly stirring to obtain a mixed solution C.
(4) And pouring the mixture A and the mixture B into a stirrer to stir for 60s, adding the mixed solution C, and stirring for 300s to obtain the light mirror-surface bare concrete mixture.
(5) And uniformly pouring the light mirror concrete mixture into a mold, stirring, and tamping by using a tamping rod until the surface is flat.
(6) And placing the steel wire mesh sheet at a depth of 20mm from the upper surface, and finally covering with a plastic film.
(7) And after pouring for 72 hours, dismantling the acrylic template, and spraying a curing agent for curing the upper surface.
Comparative example 1
The difference between this comparative example 1 and example 3 is only that: comparative example 1 the modified diatom ooze of example 3 was replaced with cement in equal amounts, the other conditions being kept unchanged, wherein the cement used was replaced with p.o52.5 portland cement.
Comparative example 2
This comparative example 2 differs from example 3 only in that: the black diatom ooze of comparative example 2 was only ground to a specific surface area of 750m 2 The modified starch is directly added after/kg, and other conditions are kept unchanged without modification treatment.
Comparative example 3
This comparative example 3 differs from example 3 only in that: comparative example 3 the floating beads of example 3 were replaced equally with cement, the other conditions being kept unchanged, wherein the cement used was also p.o52.5 portland cement.
Comparative example 4
This comparative example 4 differs from example 3 only in that: comparative example 4 the smooth and flat-surfaced acrylic template used in example 3 was changed to a normal wood template, the other conditions remained unchanged, wherein the normal wood template was a building normal template, had a certain water absorption, and the surface was rough.
The concretes prepared in the above examples and comparative examples were subjected to performance test according to the standard GB/T50080-2016 "Standard for Performance test method for common concrete mixtures", and GB/T50081-2019 "Standard for physical and mechanical Properties test method for concrete", and the test results are shown in Table 2:
TABLE 2
In Table 2, the slump, expansion, and air content are fresh concrete mix properties; the dry apparent density refers to the mass per unit volume after the concrete is molded and demolded; the 28d compressive strength represents the compressive strength of the concrete after 28 days, and the apparent morphology test project adopts a manual visual observation method to observe the apparent morphology result.
From the test results in table 2, it can be seen that:
from the test results of examples 1-3 of the present application, it is clear that: the light mirror concrete prepared by the application has few surface pores, smooth and transparent surface, mirror shape, almost no microcrack after 28d, no difference between the surface and marble appearance, excellent apparent quality and higher ornamental value; the apparent density is small, and the light weight effect is achieved; meanwhile, the 28d compressive strength is high, and the prepared concrete has good durability.
Comparing the test results of examples 1-3, it can be seen that: the use amount of the modified diatom ooze is increased, the influence on the workability of the concrete is small, the apparent density is slightly reduced, the strength of the concrete is slightly reduced, but the greatest benefit is that the color of the surface of the concrete is further deepened, the color difference is reduced, and no crack is generated after 28 days. Therefore, the usage amount of the modified diatom ooze is controlled within the limit range of the application, and the effects of good workability, low apparent density, high concrete strength, high apparent quality of the concrete surface and the like can be achieved.
Comparative example 1 has a larger concrete slump and expansion degree and an increased apparent density, compared with example 3, and the apparent mass is deteriorated although the 28d compressive strength is improved. The results show that: the comparative example 1 is not doped with modified diatom ooze, the color of the concrete surface is light, the concrete is in gray-black distribution, partial color difference appears, the subsequent surface is hydrated and whitened, the mirror effect is poor, and microcracks appear after 28 days, which shows that the embodiment of the application can change the color of concrete slurry by adding the modified diatom ooze, reduce the color difference of concrete, and the carbon nano fibers in the modified diatom ooze can effectively reduce the cracks on the concrete surface and enhance the crack resistance.
Comparative example 2 in comparison with example 3, the black diatom ooze of comparative example 2 was merely ground and not modified, and the result showed that: the problem of uneven surface color distribution of the concrete prepared in the comparative example 1 and microcrack on the surface of the concrete 28d show that the modified substance added in the modification treatment process of the black diatom ooze can increase the dispersion degree of the diatom ooze in the cement slurry and improve the crack resistance of the concrete.
Comparative example 3 in comparison with example 3, comparative example 3 replaced the same amount of floating beads with cement, and the results showed that: the concrete mix properties of comparative example 3 and example 3 are similar, but the dry apparent density of comparative example 3 is increased and the strength is improved compared with example 3, which shows that the addition of floating beads to the raw material components of the examples of the application can effectively reduce the apparent density of the concrete to achieve the effect of light weight, but a small amount of compressive strength is required to be sacrificed. Therefore, the use amount of the floating beads is controlled within the limit range of the application, so that the concrete has the characteristic of low apparent density and good concrete strength, and the prepared concrete can meet the actual use requirement.
Comparative example 4 in comparison with example 3, comparative example 4 uses a rough surface normal building template, and the results show that: compared with example 3, the concrete surface part of comparative example 4 was skinned, the grain color was darker, there was a clear color difference, and the pores were increased, which produced a mirror surface in a small part of the smooth area. The results show that the common building template is not suitable for manufacturing light mirror concrete, chromatic aberration is easy to cause, large air holes are easy to occur, and water absorption can be combined with concrete slurry, so that when the concrete is demolded, the template is stuck and peeled, and poor visual effect is caused. According to the application, through optimizing the template selection of the mould in the concrete preparation process, the materials (such as glass templates, plastic templates and the like) with smooth and smooth surfaces and difficult water absorption are selected, and the process is further optimized so as to improve the apparent quality of the prepared concrete.
In summary, the embodiment of the application has the following technical effects:
(1) The modified diatom ooze used in the embodiment of the application can deepen the color of the concrete surface, more prominently show the mirror effect, effectively improve the workability of the concrete, reduce the apparent pores of the concrete and enhance the crack resistance of the concrete.
(2) The polycarboxylic acid high-performance water reducer used in the embodiment of the application is a polycarboxylic acid water reducer special for light mirror concrete, and is prepared by compounding polycarboxylic acid water reducing mother liquor, slump retaining agent, air entraining agent, defoaming agent, retarder, water retaining agent, viscosity regulator and water. The concrete is more stable, the uniform mixing of the concrete slurry and the lightweight aggregate can be effectively controlled, and the concrete is not floated.
(3) The template used in the embodiment of the application has the characteristics of low water absorption and smooth and flat surface, and the outer surface of the concrete is tightly attached to the template in the preparation process, and the template is a mirror surface after demoulding, wherein the template is preferably an acrylic plate, the acrylic plate has strong plasticity, large template modeling variability, simple processing and good acid and alkali resistance, and can be repeatedly used for many times.
(4) The floating beads, the silica fume, the coarse aggregate (ceramsite) and the fine aggregate (ceramic sand) used in the embodiment of the application have the effect of reducing the apparent density of mirror surface concrete, can be convenient for manually carrying and installing the concrete, reduce the labor cost and have certain economical efficiency and practicability.
(5) The embodiment of the application can effectively improve the apparent state of the concrete and prevent the light raw materials from floating upwards, namely silica fume, floating beads, coarse aggregate (ceramsite) and fine aggregate (ceramic sand), so that the concrete is tightly attached to the template, and the surface layer is smoother and transparent.
The marble-like light mirror concrete and the preparation method thereof at least comprise the following design conception, action mechanism and beneficial effects:
the marble-like light mirror concrete provided by the application is doped with functional raw materials (modified diatom ooze, fly ash and expanding agent), light powder (silica fume and floating beads) and aggregate (coarse aggregate and fine aggregate), so that the problem of high apparent density of the concrete can be effectively solved, and the surface texture of the concrete is remarkably improved. The black diatom ooze is modified, so that the apparent color and luster of the concrete are distributed more uniformly, the durability of the concrete is effectively improved, the apparent density of the concrete is reduced by introducing light powder and aggregate, the light effect is achieved, the manual carrying and installation can be facilitated, the labor cost is reduced, and the concrete has certain economical efficiency and practicability. Further selecting a mould composed of templates with smooth and flat surfaces and poor water absorbability, and matching the raw material formula with a concrete preparation process to ensure that the concrete achieves the apparent mirror effect.
Firstly, the application innovatively introduces the functionalized raw material modified diatom ooze, the modified diatom ooze is obtained by modifying black diatom ooze, the application modifies the black diatom ooze through modifying substances (modifier, carbon nanofiber, latex powder and ethylene bis stearamide), so that the color distribution of concrete is more uniform, the durability of the concrete is improved, and the action mechanism of the cooperation of each modifying substance and the black diatom ooze is as follows:
the black diatom ooze powder is black inorganic color-mixing powder, and can make concrete black and present a better mirror surface state. The modifier is a coupling agent, and has the function of enabling the black diatom ooze powder of the color matching powder to be easily wetted by the cementing material, being dispersed in the cementing material stably, preventing precipitation and caking, and enabling the viscosity of the color matching powder to be greatly reduced after the surface of the color matching powder (namely the black diatom ooze powder) is modified by the coupling agent, so that the flow of the color matching powder is not influenced even if the adding amount of the color matching powder is increased. The carbon nanofiber is used as a carrier of the color mixing powder, on one hand, the color mixing powder can be effectively and quantitatively dispersed, local accumulation is prevented, the local color of the concrete is deep, on the other hand, cracks in the concrete matrix can be controlled to be controlled at a lower level, and the mechanical property and durability of the concrete are greatly improved. The emulsion powder can effectively disperse the color-changing powder, can improve the performance of cement paste and improve the bonding strength of the paste and various base materials. The ethylene bis stearamide has good coupling effect and dispersibility on pigment, can make the color of concrete more uniform, and has the effect of improving brightness. In conclusion, the black diatom ooze is modified by the modifying substances (the modifying agent, the carbon nanofiber, the latex powder and the ethylene bis stearamide), and the components are matched to ensure that the color distribution of the concrete is more uniform, the surface texture of the concrete is improved, and the durability of the concrete is effectively improved.
The polycarboxylic acid high-performance water reducer with the water reducing function is formed by compounding polycarboxylic acid water reducing mother liquor, a slump retaining agent, an air entraining agent, a defoaming agent, a retarder, a water retaining agent, a viscosity regulator and water, has a strong dispersing effect on a cementing material, obviously improves concrete workability, increases concrete viscosity, reduces floating of a concrete light material, and obviously reduces air bubbles on the surface of the concrete, thereby further improving apparent texture of the concrete.
And secondly, the application is doped with functional raw materials, light powder and aggregate to be mutually matched so as to achieve the required effect. The light powder, aggregate and other raw material components are introduced, so that the apparent density of the concrete is reduced, the concrete is light, the workability of the concrete is improved, and the human resource waste is reduced. The action mechanism of introducing the light powder, the aggregate and other raw material components is as follows:
the main mineral composition of the fly ash is aluminosilicate glass beads, the surface is smooth, the particles are fine, the texture is compact, the internal specific surface area is small, the adsorption force to water is small, the fluidity is good, and the ball bearing function is realized in the slurry; the pozzolanic reaction of fly ash lags behind the hydration of cement clinker. The secondary products of the hysteresis reaction are filled in the pores of cement hydrate, so that the porosity of the cement powdered coal mortar body is greatly reduced, the pore diameter is miniaturized and the particle size is miniaturized, the pore structure and interface characteristics of a hardened body are obviously improved, and the compactness of concrete is improved. The silica fume can fill the pores among cement particles, and simultaneously reacts with hydration products to generate gel, and the gel reacts with alkaline material magnesium oxide to generate gel, so that the compression resistance, fracture resistance, impermeability, corrosion resistance, impact resistance and wear resistance of the concrete can be remarkably improved, and the silica fume has the functions of water retention, segregation and bleeding prevention and substantial reduction of the pumping resistance of the concrete. The floating beads are hollow silicate glass microspheres, the conventional diameter of the floating beads is between 20 and 400 mu m, the conventional loose stacking density of the floating beads is between 250 and 350kg/m3, and the floating beads can be doped into concrete to greatly reduce the apparent density, so that the concrete has better fluidity, good heat preservation performance and the like. The expanding agent can lead the concrete to generate micro expansion, lead the outer wall of the concrete to be tightly attached to the template, improve the apparent density of the concrete and achieve the mirror effect.
The coarse aggregate is granular and round ceramsite, the internal structural characteristics of the ceramsite are fine honeycomb micropores, the apparent density of concrete can be effectively reduced, and the fine aggregate is ceramic sand with good grading, so that the effect of reducing the apparent density of the concrete is achieved.
In conclusion, the application effectively solves the problem of high apparent density of concrete by doping functional raw materials, light powder, aggregate and other raw material components and optimizing the mixing ratio, and can improve the surface texture and durability of the concrete and the surface compactness, color uniformity and smoothness of the concrete. And furthermore, a mould composed of templates with smooth surfaces and poor water absorbability is further selected, and the raw material formula and the concrete preparation process are matched, so that the prepared light mirror concrete has the characteristics of compact, smooth and bright surfaces, mirror surface mapping state and small apparent density, and the workability of the concrete is improved. In addition, the whole-process preparation method of the light mirror concrete provided by the application is simple, the materials are easy to obtain, and the practicability is strong.
It should be noted that:
the carbon nanofiber is abbreviated as CNF, and the vapor grown carbon nanofiber is abbreviated as VGCNF.
In addition to the practical choices presented in the above embodiments, the polycarboxylic acid high performance water reducer may preferably be an existing polycarboxylic acid water reducer with a water reduction rate of 28% to 32%, including but not limited to the practical choices presented in the above embodiments; in addition, the existing polycarboxylic acid high-performance water reducer selected by the embodiment of the application is formed by compounding polycarboxylic acid water reducing mother liquor, slump retaining agent, air entraining agent, defoaming agent, retarder, water retaining agent, viscosity regulator and water. Wherein, the collocation of each component can be finely adjusted according to different materials, so that the performance of the concrete reaches an optimal value, including but not limited to the water reducer selected by the embodiment.
In addition to the practical choices presented in the above specific embodiments, the modifier may preferably be one or more combinations of silane coupling agents, titanate coupling agents, and aluminate coupling agents, where the silane coupling agents, titanate coupling agents, and aluminate coupling agents are all existing materials, and may be adaptively selected, including but not limited to the practical choices presented in the above embodiments;
in addition to the actual choices presented by the specific embodiments described above, the carbon nanofibers may preferably be one or more combinations of carbon nanofibers, vapor grown carbon nanofibers, including but not limited to the actual choices presented by the embodiments described above;
in addition to the actual choices embodied in the specific examples above, the cement may preferably be one or more of p·o42.5 cement, p·o52.5 cement, p·o42. R, P ·o52.r5 cement, including but not limited to the actual choices embodied in the examples above;
in addition to the actual choices presented in the specific embodiments described above, the fly ash may preferably be one or more combinations of class I fly ash, I I fly ash, including but not limited to the actual choices presented in the embodiments described above;
in addition to the actual choices presented in the specific embodiments above, the expansion agent may preferably be one or more combinations of concrete type I expansion agent, concrete type I I expansion agent, plastic expansion agent, including but not limited to the actual choices presented in the embodiments above;
in addition to the practical choices embodied in the above specific examples, the coarse aggregate may preferably be one or a combination of 5-10 mm-sized ceramsite, 10-20 mm-sized ceramsite, and preferably have a bulk density of 900-1100 kg/m 3 Coarse aggregates having a barrel pressure strength in the range of 6.5MPa to 7.2MPa, including but not limited to the abovePractical choices presented in the examples;
in addition to the practical selection of the specific embodiment, the fine aggregate is one or a combination of ceramic sand with the grain diameter of 0-5 mm and machine-made sand with the grain diameter of 0-5 mm, and the fineness modulus is preferably 2.4-2.9, the mud content is 0-1%, and the bulk density is 900kg/m 3 ～1000kg/m 3 Including but not limited to the actual choices embodied in the examples above;
according to the embodiment, an acrylic plate with low water absorption, smooth and flat surface and strong plasticity is selected as a template, and according to the above conception, other material templates with low water absorption, smooth and flat surface and strong plasticity can be selected by the person skilled in the art, including but not limited to the embodiment scheme.
In summary, the specific parameters or some common reagents or raw materials in the above embodiments are specific embodiments or preferred embodiments under the concept of the present application, and are not limiting; and can be adaptively adjusted by those skilled in the art within the concept and the protection scope of the application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (7)
1. The marble-imitated light mirror concrete is characterized by comprising the following raw material components in parts by weight: 250 to 300 parts of cement, 15 to 40 parts of modified diatom ooze, 40 to 75 parts of fly ash, 25 to 40 parts of silica fume, 100 to 150 parts of floating beads, 15 to 30 parts of expanding agent, 500 to 560 parts of coarse aggregate, 700 to 750 parts of fine aggregate, 150 to 170 parts of water and 6 to 9 parts of polycarboxylic acid high-performance water reducer;
the modified diatom ooze comprises black diatom ooze powder, a modifier, carbon nanofibers, latex powder and ethylene bis stearamide, and is prepared by adding mixed powder into carbon nanofiber aqueous solution, mixing and drying; the mixed powder comprises black diatom ooze powder, latex powder, ethylene bis stearamide and a modifier; pouring the carbon nanofiber into water, and stirring while carrying out ultrasonic treatment to obtain a carbon nanofiber aqueous solution; the mass ratio of the black diatom ooze powder to the modifier to the carbon nano fiber to the latex powder to the ethylene bis-stearamide is (40-50) to (0.025-0.5) to (10-15) to (0.001-0.3) to (0.2-1);
the modifier is one or a combination of more of silane coupling agent, titanate coupling agent and aluminate coupling agent.
2. The marble-like light weight specular concrete of claim 1, wherein: the specific surface area of the black diatom ooze powder is 700m 2 /kg～800m 2 /kg。
3. The marble-like light weight specular concrete of claim 1, wherein: the carbon nanofiber is one or a combination of more of carbon nanofiber and vapor grown carbon nanofiber.
4. The marble-like light weight specular concrete of claim 1, wherein: the cement is one or a combination of more of P.O42.5 cement, P.O52.5 cement and P.O42. R, P.O52.5R cement;
the fly ash is one or a combination of more of class I fly ash and class II fly ash;
the silica fume is one or a combination of more of SF 90-grade silica fume and SF 94-grade silica fume.
5. The marble-like light weight specular concrete of claim 1, wherein: the expanding agent is one or a combination of more of a concrete I expanding agent, a concrete II expanding agent and a plastic expanding agent;
the coarse aggregate is one or a combination of more of ceramsite with the grain size of 5-10 mm and ceramsite with the grain size of 10-20 mm;
the fine aggregate is one or a combination of more of ceramic sand with the grain diameter of 0-5 mm and machine-made sand with the grain diameter of 0-5 mm.
6. A method for preparing the marbleized light weight specular concrete according to any one of claims 1 to 5, comprising the following steps:
weighing the following raw material components: weighing cement, modified diatom ooze, fly ash, silica fume, floating beads, an expanding agent, coarse aggregate, fine aggregate, water and a polycarboxylic acid high-performance water reducer according to a certain weight part;
uniformly mixing coarse aggregate and fine aggregate to obtain a mixture A; uniformly mixing cement, modified diatom ooze, fly ash, silica fume, floating beads and an expanding agent to obtain a mixture B; uniformly mixing a polycarboxylic acid high-performance water reducer and water to obtain a mixed solution C;
uniformly mixing the mixture A and the mixture B, and then adding the mixed solution C to uniformly mix to obtain a light mirror concrete mixture;
pouring the obtained light mirror concrete mixture into a mould, stirring, inserting and tamping after pouring is completed until the surface is flat;
and waiting for a certain time after pouring is completed, and removing the die to obtain the marble-imitated light mirror concrete.
7. The method for preparing the marble-like light mirror concrete according to claim 6, wherein the mold is formed by splicing templates with smooth and flat surfaces and low water absorption.
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| CN103803904A (en) * | 2013-12-30 | 2014-05-21 | 北京新航建材集团有限公司 | Self-compacting light aggregate concrete and preparation method thereof |
| CN106882946A (en) * | 2015-12-16 | 2017-06-23 | 营口渤海科技有限公司 | A kind of preparation method of modified diatom ooze |
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