CN111302740A - Low-mixing high-strength all-lightweight aggregate concrete for members and preparation method thereof - Google Patents
Low-mixing high-strength all-lightweight aggregate concrete for members and preparation method thereof Download PDFInfo
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- CN111302740A CN111302740A CN202010268647.8A CN202010268647A CN111302740A CN 111302740 A CN111302740 A CN 111302740A CN 202010268647 A CN202010268647 A CN 202010268647A CN 111302740 A CN111302740 A CN 111302740A
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- 239000004567 concrete Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 34
- 239000000919 ceramic Substances 0.000 claims abstract description 29
- 239000010881 fly ash Substances 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 26
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 230000000740 bleeding effect Effects 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 19
- 239000000203 mixture Substances 0.000 description 13
- 239000010754 BS 2869 Class F Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- -1 ceramsite Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a low-admixture high-strength all-lightweight aggregate concrete for members and a preparation method thereof, wherein the high-strength all-lightweight aggregate concrete comprises the following components in parts: 400-480 parts of cement; 140-160 parts of mixing water; 500-650 parts of ceramsite; 300-450 parts of ceramic sand; 4.4-6.5 parts of an additive; 50-100 parts of fly ash; the slump of the prepared lightweight aggregate concrete is 172mm, the 7d average compressive strength is 37.4MPa, the 28d average compressive strength is 43.5MPa, and the dry apparent density is 1637kg/m3. The invention improves the strength and the workability of the lightweight aggregate concrete through the reasonable proportion of the cement and the ceramsite, ensures that the lightweight aggregate concrete can meet the strength requirement under the condition of low admixture, is suitable for the actual production of the member, and can improve the transportation and hoisting efficiency of the member.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to low-admixture high-strength all-lightweight aggregate concrete for a member and a preparation method thereof.
Background
The light aggregate concrete has the characteristics of light dead weight, heat preservation and insulation, good fire resistance and the like. The light aggregate concrete is researched from the 50 th of the 20 th century in China, is mainly used for large-scale external wall panels and small-scale hollow building blocks of industrial and civil buildings, and is a little used for bearing structures and thermal structures of high-rise and bridge buildings.
At present, the research on the lightweight aggregate concrete mainly focuses on the aspects of light weight and high strength, and the density grade and the strength grade of the lightweight aggregate concrete are in direct proportion. Relevant researches show that the admixture of fly ash, mineral powder, silica fume, cellulose and the like can improve the strength of the lightweight aggregate concrete. However, in the production process of the member, only a small amount of fly ash can be mixed due to the limitation of raw materials and production requirements, and the requirements of light weight and high strength are difficult to achieve. Therefore, how to select raw materials and optimize the proportion to meet the use requirement of light weight and high strength and meet the economic requirement of low cost is a research difficulty of the current high-strength light aggregate concrete.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the low-admixture high-strength full-lightweight aggregate concrete for the member, and the lightweight aggregate concrete with the density grade of 1600 and the strength grade of LC40 can be prepared. In addition, the invention also provides a preparation method of the low-admixture high-strength all-lightweight aggregate concrete for the member.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which comprises the following components in parts:
400-480 parts of cement; P.O 52.5.5 ordinary Portland cement, 28d mortar compressive strength is more than or equal to 56MPa, water consumption of standard consistency of cement is less than or equal to 27 percent, initial setting time of cement is more than or equal to 135min, final setting time is less than or equal to 221min, specific surface area of cement is less than or equal to 380m2/kg；
140-160 parts of mixing water;
500-650 of ceramsite, wherein the particle size of the ceramsite is 5-20 mm, the continuous grading is 700-grade shale ceramsite, and the stacking density grade is 680-700 kg/m3The apparent density grade is 1420-1450 kg/m3The water absorption rate is 5 percent, and the cylinder pressure strength is 7.8 MPa;
300-450 parts of ceramic sand, wherein the particle size of the ceramic sand is 3-5 mm, and the stacking density is 680-700 kg/m3；
4.4-6.5 of an additive, wherein the additive is a polycarboxylic acid high-performance water reducing agent, the water reducing rate of the additive is 23-27%, and the bleeding rate in 3 hours is not more than 5%;
50-100 parts of fly ash, wherein the fly ash is F-type fly ash;
the slump of the prepared lightweight aggregate concrete is 172mm, the 7d average compressive strength is 37.4MPa, the 28d average compressive strength is 43.5MPa, and the dry apparent density is 1637kg/m3。
In one embodiment of the invention, the composition consists of the following components in parts: mixing water 149, cement 474, ceramsite 528, ceramic sand 376, fly ash 100 and an additive 4.52.
As a further preference, the water-cement ratio in the all-lightweight aggregate concrete is: 0.25-0.35, wherein the mass ratio of the fly ash to the cement is as follows: 0.13-0.21, the sand rate is: 30 to 42 percent. The sand ratio is the mass of the ceramic sand/(mass of the ceramic sand + mass of the ceramsite) × 100%.
Preferably, the ceramsite is subjected to pre-water absorption treatment and reaches a saturated surface dry state before preparation.
In a second aspect of the invention, a preparation method of low-admixture high-strength all-lightweight aggregate concrete for a member is provided, which comprises the following steps:
step one, preparing raw materials; the paint comprises the following components in parts by weight: 140-160 parts of mixing water, 400-480 parts of cement, 550-650 parts of ceramsite, 300-450 parts of ceramic sand, 50-65 parts of fly ash and 4.4-6.5 parts of an additive;
and step two, fully mixing and stirring the raw materials in the step one to obtain the high-strength all-light aggregate concrete.
Preferably, in the first step, the ceramsite is subjected to pre-water absorption treatment for a duration longer than 1 hour, and reaches a saturated surface dry state before preparation.
As a further preference, the second step is specifically as follows: and putting the cement, the ceramsite, the ceramic sand and the fly ash with all the mass into the mixer, stirring for 1min, then mixing the mixing water with all the mass into the mixer, and stirring for 4 min.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the high-strength all-light aggregate concrete, the ceramsite is subjected to pre-water absorption treatment before preparation, the strength and the workability of the light aggregate concrete are improved through the reasonable proportion of the cement to the ceramsite, the light aggregate concrete can meet the strength requirement under the condition of low admixture, the high-strength all-light aggregate concrete is suitable for the actual production of components, and the component transportation and hoisting efficiency can be improved.
(2) The invention does not adopt admixtures of mineral powder, silica fume, fiber and the like to improve the strength, solves the problem of lack of related raw materials in a component factory, has stronger practicability of the prepared light aggregate concrete, has certain economic benefit and engineering potential, and provides favorable reference for the preparation of the subsequent high-performance high-strength light aggregate concrete.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition consists of the following components:
400-480 parts of cement; P.O 52.5.5 ordinary Portland cement, 28d mortar compressive strength is more than or equal to 56MPa, water consumption of standard consistency of cement is less than or equal to 27 percent, initial setting time of cement is more than or equal to 135min, final setting time is less than or equal to 221min, specific surface area of cement is less than or equal to 380m2/kg。
Mixing water 140-160 parts.
500-650 of ceramsite, wherein the particle size of the ceramsite is 5-20 mm, the continuous grading is 700 grades of shale ceramsite, and the bulk density is 680-700 kg/m3The apparent density is 1420-1450 kg/m3The water absorption was 5% and the barrel pressure was 7.8 MPa.
300-450 parts of ceramic sand, wherein the particle size of the ceramic sand is 3-5 mm, and the bulk density is 700kg/m3Apparent densityDegree rating of 1440kg/m3The water absorption was 6%.
4.4-6.5 of an additive, wherein the additive is a polycarboxylic acid high-performance water reducing agent, the water reducing rate is 23-27%, and the bleeding rate in 3 hours is not more than 5%.
50-100 parts of fly ash, wherein the fly ash is F-type fly ash.
The water-cement ratio of the high-strength full-light aggregate concrete is as follows: 0.25-0.35, wherein the mass ratio of the fly ash to the cement is as follows: 0.13-0.21, the sand rate is: 30 to 42 percent.
The preparation steps of the high-strength all-lightweight aggregate concrete are as follows:
step one, preparing raw materials;
step two, carrying out pre-water absorption treatment on the ceramsite for more than 1 hour, and achieving a saturated surface dry state before configuration;
thirdly, putting cement, ceramsite, ceramic sand and fly ash in the balance, and stirring for 1 min;
and step four, mixing and adding all the mixing water and the additives, and stirring for 4 min.
Example 1
This example provides a concrete having a single concrete mix ratio (kg/m)3) The composition is shown in table 1:
TABLE 1
In order to screen out the ceramsite with better performance, the invention firstly carries out primary selection to screen out 700-grade Yichang bright large shale ceramsite and 900-grade Shanghai group shale ceramsite, and the two ceramsite have better performance compared with the ceramsite of other brands. The material properties of the two ceramic granules are shown in Table 2.
TABLE 2
700-grade Yichang large shale ceramsite and 900-grade Shanghai group shale ceramsite are added into the mixture ratio of the example 1, and the obtained relevant physical properties are shown in Table 3.
TABLE 3
As can be seen from the above table, the physical and mechanical properties of the lightweight aggregate concrete prepared from the 700-grade ceramsite are better.
Example 2
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition is shown in table 4:
TABLE 4
| Name (R) | Mixing water | Cement | Ceramic particle | Ceramic sand | Fly ash | Admixture (Maiste) |
| Variety specification | Clean water | P.O52.5 | 700 stage | 700 stage | Class F | 8101 |
| Dosage of | 149 | 474 | 528 | 376 | 100 | 4.52 |
Under the condition of the mixture ratio, the lightweight aggregate concrete is produced in small batches, and the blended lightweight aggregate concrete does not bleed or is not grouted. The compressive strength of the prepared light aggregate concrete is tested according to the acceptance criteria of concrete structure construction quality (GB50204-2015), and the compressive strength of the light aggregate concrete 28d is detected to be 43.5MPa, and the dry apparent density is 1637kg/m 3.
Example 3
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition is shown in table 5:
TABLE 5
| Name (R) | Mixing water | Cement | Ceramic particle | Ceramic sand | Fly ash | Admixture (Maiste) |
| Variety specification | Clean water | P.O52.5 | 700 stage | 700 stage | Class F | 8101 |
| Dosage of | 160 | 400 | 650 | 400 | 70 | 4.4 |
Example 4
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition is shown in table 6:
TABLE 6
| Name (R) | Mixing water | Cement | Ceramic particle | Ceramic sand | Fly ash | Admixture (Maiste) |
| Variety specification | Clean water | P.O52.5 | 700 stage | 700 stage | Class F | 8101 |
| Dosage of | 155 | 420 | 600 | 400 | 80 | 4.5 |
Example 5
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition is shown in table 7:
TABLE 7
| Name (R) | Mixing water | Cement | Ceramic particle | Ceramic sand | Fly ash | Admixture (Maiste) |
| Variety specification | Clean water | P.O52.5 | 700 stage | 700 stage | Class F | 8101 |
| Dosage of | 150 | 450 | 550 | 395 | 80 | 5.5 |
Example 6
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition is shown in table 8:
TABLE 8
| Name (R) | Mixing water | Cement | Ceramic particle | Ceramic sand | Fly ash | Admixture (Maiste) |
| Variety specification | Clean water | P.O52.5 | 700 stage | 700 stage | Class F | 8101 |
| Dosage of | 145 | 475 | 550 | 375 | 100 | 4.5 |
Example 7
The embodiment provides a low-admixture high-strength all-lightweight aggregate concrete for a member, which is prepared according to a single concrete mixing ratio (kg/m)3) The composition is shown in table 9:
TABLE 9
| Name (R) | Mixing water | Cement | Ceramic particle | Ceramic sand | Fly ash | Admixture (Maiste) |
| Variety specification | Clean water | P.O52.5 | 700 stage | 700 stage | Class F | 8101 |
| Dosage of | 140 | 480 | 520 | 375 | 100 | 6.5 |
The compressive strength of the prepared lightweight aggregate concrete is tested according to the acceptance criteria of concrete structure construction quality (GB50204-2015), and the results are shown in Table 10.
Watch 10
As can be seen from Table 10, the high strength compression concrete obtained by using the formulation of example 2 has the best physical properties and good economic benefits, and is suitable for mass production of structural members.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (7)
1. The low-admixture high-strength all-lightweight aggregate concrete for the members is characterized by comprising the following components in parts by weight:
400-480 parts of cement; P.O 52.5.5 ordinary Portland cement, 28d mortar compressive strength is more than or equal to 56MPa, water consumption of standard consistency of cement is less than or equal to 27 percent, initial setting time of cement is more than or equal to 135min, final setting time is less than or equal to 221min, specific surface area of cement is less than or equal to 380m2/kg；
140-160 parts of mixing water;
500-650 of ceramsite, wherein the particle size of the ceramsite is 5-20 mm, the continuous grading is 700 grades of shale ceramsite, and the bulk density is 680-700 kg/m3The apparent density is 1420-1450 kg/m3The water absorption rate is 5% in 1 hour, and the cylinder pressure strength is 7.8 MPa;
300-450 parts of ceramic sand, wherein the particle size of the ceramic sand is 3-5 mm, and the stacking density is 680-700 kg/m3；
4.4-6.5 of an additive, wherein the additive is a polycarboxylic acid high-performance water reducing agent, the water reducing rate of the additive is 23-27%, and the bleeding rate in 3 hours is not more than 5%;
50-100 parts of fly ash, wherein the fly ash is F-type fly ash;
prepared light aggregate concreteThe falling degree is 172mm, the 7d average compressive strength is 37.4MPa, the 28d average compressive strength is 43.5MPa, and the dry apparent density is 1637kg/m3。
2. The low-admixture high-strength all-lightweight aggregate concrete for construction members as claimed in claim 1, which is composed of the following components in parts: 149 parts of mixing water, 474 parts of cement, 528 parts of ceramsite, 376 parts of ceramic sand, 100 parts of fly ash and 4.52 parts of an additive.
3. The low-admixture high-strength all-lightweight aggregate concrete for structural members as claimed in claim 1, wherein the water-cement ratio in the all-lightweight aggregate concrete is: 0.25-0.35, wherein the mass ratio of the fly ash to the cement is as follows: 0.13-0.21, the sand rate is: 30 to 42 percent.
4. The low-admixture high-strength all-lightweight aggregate concrete for structural members as claimed in claim 1, wherein said ceramsite is pre-treated with water to be in a saturated surface dry state before being disposed.
5. The preparation method of the low-admixture high-strength all-lightweight aggregate concrete for the components is characterized by comprising the following steps of:
step one, preparing raw materials; the paint comprises the following components in parts by weight: 140-160 parts of mixing water, 400-480 parts of cement, 500-650 parts of ceramsite, 300-450 parts of ceramic sand, 50-100 parts of fly ash and 4.4-6.5 parts of an additive;
and step two, fully mixing and stirring the raw materials in the step one to obtain the high-strength all-light aggregate concrete.
6. The method for preparing a low-admixture high-strength all-lightweight aggregate concrete for structural members as claimed in claim 5, wherein in the first step, the ceramsite is subjected to pre-water absorption treatment for a duration of more than 1 hour to reach a saturated surface dry state before preparation.
7. The method for preparing the low-admixture high-strength all-lightweight aggregate concrete for the structural member according to claim 5, wherein the second step is as follows: and putting the cement, the ceramsite, the ceramic sand and the fly ash with all the mass into the mixer, stirring for 1min, then mixing the mixing water with all the mass into the mixer, and stirring for 4 min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114409435A (en) * | 2021-12-07 | 2022-04-29 | 上海建工建材科技集团股份有限公司 | Ceramsite surface modified lightweight concrete and preparation method thereof |
| CN114560662A (en) * | 2022-03-25 | 2022-05-31 | 东南大学 | Lightweight material with high specific strength and anti-drying shrinkage and preparation method thereof |
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| CN103848606A (en) * | 2014-01-14 | 2014-06-11 | 中铁第一勘察设计院集团有限公司 | High-strength ceramsite lightweight aggregate concrete |
| CN104788050A (en) * | 2015-01-27 | 2015-07-22 | 浙江大学 | Ceramsite lightweight aggregate structural concrete and preparation method thereof |
| CN110386789A (en) * | 2019-08-07 | 2019-10-29 | 山东大元实业股份有限公司 | A kind of concrete product and preparation method thereof using flyash haydite production |
| WO2020063203A1 (en) * | 2018-09-26 | 2020-04-02 | 广西旭腾实业集团有限公司 | High-strength light-weight aggregate concrete and preparation method therefor |
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2020
- 2020-04-08 CN CN202010268647.8A patent/CN111302740A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103641415A (en) * | 2013-12-16 | 2014-03-19 | 中国人民解放军理工大学 | High-strength anti-cracking ceramsite concrete and preparation method thereof |
| CN103848606A (en) * | 2014-01-14 | 2014-06-11 | 中铁第一勘察设计院集团有限公司 | High-strength ceramsite lightweight aggregate concrete |
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| WO2020063203A1 (en) * | 2018-09-26 | 2020-04-02 | 广西旭腾实业集团有限公司 | High-strength light-weight aggregate concrete and preparation method therefor |
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| CN114409435A (en) * | 2021-12-07 | 2022-04-29 | 上海建工建材科技集团股份有限公司 | Ceramsite surface modified lightweight concrete and preparation method thereof |
| CN114560662A (en) * | 2022-03-25 | 2022-05-31 | 东南大学 | Lightweight material with high specific strength and anti-drying shrinkage and preparation method thereof |
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