CN113912353B - Thermal insulation mortar and preparation method thereof - Google Patents
Thermal insulation mortar and preparation method thereof Download PDFInfo
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- CN113912353B CN113912353B CN202111387665.9A CN202111387665A CN113912353B CN 113912353 B CN113912353 B CN 113912353B CN 202111387665 A CN202111387665 A CN 202111387665A CN 113912353 B CN113912353 B CN 113912353B
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 85
- 238000009413 insulation Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 117
- 239000000919 ceramic Substances 0.000 claims abstract description 105
- 238000005498 polishing Methods 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000004576 sand Substances 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 34
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 239000011324 bead Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 16
- 239000004816 latex Substances 0.000 claims abstract description 16
- 229920000126 latex Polymers 0.000 claims abstract description 16
- 230000008719 thickening Effects 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims description 39
- 239000000203 mixture Substances 0.000 claims description 30
- 239000002562 thickening agent Substances 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 11
- 239000003607 modifier Substances 0.000 claims description 9
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 8
- -1 polypropylene Polymers 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 238000000498 ball milling Methods 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000006703 hydration reaction Methods 0.000 description 15
- 230000036571 hydration Effects 0.000 description 14
- 239000000047 product Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004005 microsphere Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000006259 organic additive Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 230000007704 transition Effects 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
- C04B18/082—Cenospheres
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/165—Ceramic waste
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to thermal insulation mortar and a preparation method thereof, wherein the thermal insulation mortar comprises the following components in parts by weight: 100-220 parts of cement; 40-80 parts of floating beads; 150-350 parts of modified ceramic polishing powder; 200-300 parts of ceramic sand; 5-20 parts of dispersible latex powder; 5-10 parts of a polycarboxylic acid water reducing agent; 5-10 parts of thickening powder; the modified ceramic polishing powder comprises ceramic polishing powder waste. The thermal insulation mortar and the preparation method thereof provided by the invention can be used for solving the problems of high manufacturing cost and the like of the existing thermal insulation mortar while ensuring the performance of the thermal insulation mortar.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to thermal insulation mortar and a preparation method thereof.
Background
The heat-insulating mortar is a premixed dry-mixed mortar which is prepared by mixing ceramic sand as aggregate, cement as cementing material and some modified additives, and is generally used for constructing a building surface heat-insulating layer.
At present, the most used heat insulation material of the heat insulation mortar is a vitrified microsphere heat insulation material, the cost of the vitrified microsphere heat insulation material is high, and the cement consumption of the existing heat insulation mortar is large, so that the total engineering cost is increased.
Disclosure of Invention
Based on the heat-insulating mortar and the preparation method thereof, the invention solves the problems of high manufacturing cost and the like of the existing heat-insulating mortar while ensuring the performance of the heat-insulating mortar.
The thermal insulation mortar comprises the following components in parts by weight:
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
Preferably, the thermal mortar comprises the following components in parts by weight:
preferably, the thermal mortar further comprises the following components in parts by weight:
20-80 parts of fly ash;
2-16 parts of polypropylene fiber.
Preferably, the cement comprises at least one of 42.5R ordinary portland cement, pc32.5 composite portland cement, and pc32.5 cement.
Preferably, the ceramic sand includes at least one of silt ceramic sand, electroceramic ceramic sand and fly ash ceramic sand.
Preferably, the thickening powder comprises at least one of an inorganic thickener, a ligno-cellulosic thickener, an ether-based thickener, and a polyacrylate thickener.
Preferably, the modified ceramic polishing powder has activity>60% of specific surface area>920m 2 Density/kg>2.58g/cm 3 。
The invention also provides a preparation method of the thermal insulation mortar, which comprises the following steps:
the method comprises the following steps of physically stirring cement, floating beads, modified ceramic polishing powder and ceramic sand, and uniformly stirring to obtain a first mixture;
adding water into the first mixture, and uniformly stirring to obtain a second mixture;
adding dispersible latex powder, thickening powder and polycarboxylic acid water reducing agent into the second mixture, and uniformly stirring to react to prepare heat-insulating mortar;
100-220 parts of cement; 40-80 parts of floating beads; 150-350 parts of modified ceramic polishing powder; 200-300 parts of ceramic sand; 5-20 parts of dispersible latex powder; (ii) a 5-10 parts of a polycarboxylic acid water reducing agent; 5-10 parts of thickening powder;
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
Preferably, the mass ratio of the first mixture to water is (7-10): (1-4).
Preferably, the preparation method of the modified ceramic polishing powder comprises the following steps:
and after drying and ball milling the ceramic polishing powder waste, adding a surface modifier solution into the polishing powder waste, stirring at 40-50 ℃, uniformly stirring to obtain a mixed solution, filtering the mixed solution, and drying and grinding the filtered solid to obtain the modified ceramic polishing powder.
Compared with the prior art, the invention has the following beneficial effects:
the modified ceramic polishing powder has certain activity, can replace part of cement, and can promote the generation of cement hydration products; on the other hand, the modified ceramic polishing powder which does not participate in hydration is filled in the internal gap of the mortar, so that the internal structure of the thermal insulation mortar is more compact, and the compressive strength and the durability of the mortar are improved.
The floating bead is used for replacing a vitrified microsphere thermal insulation material in the existing thermal insulation mortar, the floating bead is a thermal insulation refractory material, the thermal insulation mortar has a thermal insulation effect by adding the floating bead into the mortar, and the manufacturing cost of the floating bead is lower than that of the vitrified microsphere, so that the manufactured thermal insulation mortar is low.
The dispersible latex powder and the thickening powder can improve the adhesive property of the thermal insulation mortar, the polycarboxylate water reducer can reduce the water consumption of the thermal insulation mortar and improve the fluidity and the compressive strength of the thermal insulation mortar, and the components are combined to ensure the excellent compressive property and the crack resistance durability of the thermal insulation mortar.
The modified ceramic polishing powder used in the invention is derived from ceramic polishing powder waste, realizes the reutilization of the waste, meets the requirement of environmental protection, and reduces the cost of raw materials for preparing the thermal insulation mortar.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The experimental procedures in the following examples are conventional unless otherwise specified. Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, and includes a technical scheme a, a technical scheme B, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides thermal insulation mortar which comprises the following components in parts by weight:
the modified ceramic polishing powder is derived from ceramic polishing powder waste.
The modified ceramic polishing powder has certain activity, can replace part of cement, and can promote the generation of cement hydration products; on the other hand, the modified ceramic polishing powder which does not participate in hydration is filled in the internal gap of the mortar, so that the internal structure of the thermal insulation mortar is more compact, and the compressive strength and the durability of the mortar are improved.
The dispersible latex powder and the thickening powder can improve the adhesive property of the thermal insulation mortar, the polycarboxylate water reducer can reduce the water consumption of the thermal insulation mortar and improve the fluidity and the compressive strength of the thermal insulation mortar, and the components are combined to ensure the excellent compressive property and the crack resistance durability of the thermal insulation mortar.
The floating beads are used for replacing vitrified micro bubbles in the existing thermal insulation mortar, are thermal insulation refractory materials and are added into the mortar to ensure that the thermal insulation mortar has the thermal insulation effect, and the manufacturing cost of the floating beads is lower than that of the vitrified micro bubbles. The effect of reducing the cost is achieved.
The modified ceramic polishing powder used in the invention is derived from ceramic polishing powder waste, so that the waste is recycled, the environment-friendly requirement is met, and the cost of raw materials for preparing the thermal insulation mortar is reduced.
In addition, the ceramic sand is prepared by replacing clay with river bottom mud through dredging, natural drying, balling of raw materials, preheating, roasting and cooling, so that the soil competition between building material manufacturing industry and agricultural land can be reduced, a reasonable path is found for the river bottom mud, the problem of secondary pollution of the river bottom mud is solved, and the purpose of recycling waste is achieved;
the water reducing efficiency of the used polycarboxylic acid water reducing agent is 30-36%.
In some embodiments, the thermal mortar comprises, in parts by weight:
in some embodiments, the thermal mortar further comprises, in parts by weight:
20-80 parts of fly ash;
2-16 parts of polypropylene fiber.
Specifically, the fly ash can replace part of cement so as to reduce the cost of the thermal insulation mortar;
and the fly ash is waste powder after coal combustion, so that the reutilization of wastes is realized, the requirements of environmental protection are met, and the cost of raw materials for preparing the thermal insulation mortar is reduced.
The dispersible latex powder and the thickening powder can wrap polypropylene fibers in the thermal insulation mortar, and the polypropylene fibers can improve the crack resistance and durability of the thermal insulation mortar.
In some embodiments, the thermal mortar comprises, in parts by weight:
in some embodiments, the cement comprises at least one of 42.5R ordinary portland cement, pc32.5 composite portland cement, and pc32.5 cement.
In some embodiments, the ceramic sand includes at least one of silt ceramic sand, electroceramic ceramic sand, and fly ash ceramic sand.
The grain diameter of the ceramic sand is at least one of 5-10mm, 5-20mm and 10-20 mm; the volume weight of the pottery sand is 400-600kg/m 3 。
The ceramic sand can reduce the volume weight of the thermal insulation mortar.
In some embodiments, the thickening powder comprises at least one of an inorganic thickener, a lignocellulosic thickener, an ether thickener, and a polyacrylate thickener.
In some embodiments, the activity of the modified ceramic polishing powder>60% ratioSurface area>Is 920m 2 Density/kg>2.58g/cm 3 。
The invention also provides a preparation method of the thermal insulation mortar, which comprises the following steps:
the method comprises the following steps of physically stirring cement, floating beads, modified ceramic polishing powder and ceramic sand, and uniformly stirring to obtain a first mixture;
adding water into the first mixture, and uniformly stirring to obtain a second mixture;
adding the dispersible latex powder, thickening powder and polycarboxylic acid water reducing agent into the second mixture, and uniformly stirring to react to obtain the heat-insulating mortar;
100-220 parts of cement by weight; 40-80 parts of floating beads; 150-350 parts of modified ceramic polishing powder; 200-300 parts of ceramic sand; 5-20 parts of dispersible latex powder; 5-10 parts of a polycarboxylic acid water reducing agent; 5-10 parts of thickening powder; water;
specifically, in the step of uniformly stirring the cement, the floating beads, the modified ceramic polishing powder and the ceramic sand to obtain a first mixture, physical mechanical stirring is carried out, and no chemical reaction occurs;
adding water into the first mixed solution, hydrating the cement and the modified ceramic polishing powder to form a hydration product, wherein the hydration product contains Ca (OH) 2 Solution, ca (OH) 2 The solution quickly reaches saturation and precipitates crystals, and meanwhile, ettringite crystals and calcium silicate hydrate gel are generated.
Adding the dispersed latex powder, thickening powder and polycarboxylic acid water reducing agent into the second mixture, and then stirring for reaction;
specifically, the dispersible emulsion powder is contacted with water to form an emulsion, polymer particles in the emulsion are deposited on the calcium silicate hydrate gel and the unhydrated cement particles, hydration products are increased along with the progress of hydration reaction, and the polymer particles in the emulsion form a compact accumulation layer on the surface of the calcium silicate hydrate gel and the unhydrated cement particles;
the tight accumulation layer is gradually filled with the pores of the mortar, and the tight accumulation layer is condensed into a continuous film due to further reduction of hydration or dry moisture, so that a mixture interpenetrating with the hydrated cement paste is formed, and the bonding of a hydration product and the ceramic sand is improved.
On the other hand, the hydration product with the polymer forms a covering layer on the interface, thereby influencing the growth of ettringite and coarse calcium hydroxide crystals, and the polymer is condensed into a film in the pores of the mortar, thereby leading the transition zone of the polymer and the cement to be more compact.
Reactive groups in some polymer molecules with Ca in cement hydration products 2+ 、A1 3+ And the like to generate a crosslinking reaction to form a special bridge bond effect, improve the physical organization structure of the cement-based material hardened body, relieve the internal stress and reduce the generation of microcracks.
The stirring time for physically stirring the cement, the floating beads, the modified ceramic polishing powder and the ceramic sand is not less than 2min.
All the components are added at the same time and agglomerated together, so that the inorganic powder is mixed uniformly, and then other organic additives are added, so that the materials can be mixed more uniformly, and the performance is improved more obviously.
In addition, the inorganic powder is mixed before water is added, because the inorganic powder is hydrated after water is added and is difficult to be uniformly mixed, and the organic additives are dispersed after water is added, or the organic additives are absorbed and agglomerated by the inorganic powder.
In some embodiments, the mass ratio of the first mixture to the water is (7-10): (1-4).
In some embodiments, the method of preparing the modified ceramic polishing powder comprises the steps of:
drying and ball-milling the ceramic polishing powder waste, adding a surface modifier solution into the polishing powder waste, stirring at 40-50 ℃, uniformly stirring to obtain a mixed solution, filtering the mixed solution, and drying and grinding the filtered solid to obtain the modified ceramic polishing powder.
Specifically, the mass ratio of the ceramic polishing powder subjected to dry ball milling to the surface modifier solution is 1:4 to 6;
the surface modifier is added to perform surface modification treatment on the ceramic polishing powder after drying and ball milling, and solute in the surface modifier is adsorbed on the surface of the ceramic polishing powder, so that the ceramic polishing powder forms an organic molecular layer, and the ceramic polishing powder is changed from hydrophilicity to organophilic property;
adding the surface modifier solution into the polishing powder waste, and stirring at 40-50 deg.C for 2-6min.
In some embodiments, the surface modifying agent comprises at least one of an aluminate coupling agent, a silane coupling agent, and a titanate coupling agent.
Example 1
100kg of composite portland cement pc32.5, 20kg of fly ash, 40kg of floating beads, 160kg of modified ceramic polishing powder and 260kg of silt ceramic sand are placed in a stirrer for physical stirring. Stirring for 2min to obtain a first mixture;
adding 73kg of water into the first mixture, and uniformly stirring to obtain a second mixture;
and adding 5kg of dispersible latex powder, 2kg of inorganic thickening agent, 5kg of polypropylene fiber and 5kg of polycarboxylic acid water reducing agent into the second mixture, and uniformly stirring and reacting for 4min to obtain the thermal insulation mortar.
Wherein the activity of the modified ceramic polishing powder is 60 percent, and the specific surface area is 920m 2 Kg, density 2.58g/cm 3 ；
The silt ceramic sand has the grain diameter of 5-10mm and the volume weight of 400kg/m 3 ；
The water reducing efficiency of the polycarboxylic acid water reducing agent is 36%.
Example 2
Placing 220kg of composite portland cement pc32.5, 80kg of fly ash, 80kg of floating beads, 320kg of modified ceramic polishing powder and 250kg of silt ceramic sand in a stirrer for physical stirring for 2min, and uniformly stirring to obtain a first mixture;
adding 136kg of water into the first mixture, and uniformly stirring to obtain a second mixture;
and adding 20kg of dispersible latex powder, 16kg of inorganic thickening agent, 10kg of polypropylene fiber and 10kg of polycarboxylic acid water reducing agent into the second mixture, and uniformly stirring and reacting for 4min to obtain the thermal insulation mortar.
Wherein the activity of the modified ceramic polishing powder is 60 percent, and the specific surface area is 920m 2 Kg, density 2.58g/cm 3 ；
The silt ceramic sand has a particle size of 5-10mm and a volume weight of 400kg/m 3 ；
The water reducing efficiency of the polycarboxylic acid water reducing agent is 36%.
Example 3
Placing 160kg of composite portland cement pc32.5, 50kg of fly ash, 60kg of floating beads, 210kg of modified ceramic polishing powder and 250kg of silt ceramic sand in a stirrer, physically stirring for 2min, and uniformly stirring to obtain a first mixture;
adding 102kg of water into the first mixture, and stirring for 4min to obtain a second mixture;
and adding 13kg of dispersed latex powder, 7kg of inorganic thickening agent, 8kg of polypropylene fiber and 7kg of polycarboxylic acid water reducing agent into the second mixture, and uniformly stirring to react to obtain the thermal insulation mortar.
Wherein the activity of the modified ceramic polishing powder is 60 percent, and the specific surface area is 920m 2 Kg, density 2.58g/cm 3 ；
The silt ceramic sand has the grain diameter of 5-10mm and the volume weight of 400kg/m 3 ；
The water reducing efficiency of the polycarboxylate superplasticizer is 36%.
Comparative example 1
In strict comparison with example 3, no modified ceramic polishing powder was added during the preparation of the thermal mortar, and the thermal mortar was compared with the thermal mortar of the present invention.
The preparation methods of the modified ceramic polishing powders used in examples 1 to 3 and comparative example 1 were as follows:
drying and ball-milling the ceramic polishing powder waste, adding a surface modifier solution into the polishing powder waste, stirring at 40 ℃, stirring for 4min to obtain a mixed solution, filtering the mixed solution, and drying and grinding the filtered solid to obtain the modified ceramic polishing powder.
Performance test of thermal insulation mortar
The thermal mortar prepared in the above examples 1 to 3 and comparative example 1 was prepared according to the following standards: GB/T20473-2006 building thermal insulation mortar carries out performance test, and the result is shown in Table 1:
TABLE 1 Performance test results for thermal mortar
The test results in Table 1 show that all properties of the environment-friendly mortar meet the requirements of national standard GB/T20473-2006 building thermal insulation mortar;
compared with the example 1, the polishing powder mixing amount of the example 2 is increased, and as can be seen from the table 1, the dry density, the compressive strength, the linear shrinkage rate and the compression-shear bonding strength of the thermal insulation mortar are respectively improved by 11.7%, 161%, 28.6% and 42.4% along with the increase of the modified ceramic polishing powder mixing amount in the thermal insulation mortar;
the modified ceramic polishing powder is related to the morphological effect of the modified ceramic polishing powder, one part of the modified ceramic polishing powder participates in the hydration of cement to generate more hydration products, the unit water consumption of the mortar can be reduced, the other part of the modified ceramic polishing powder which does not participate in the hydration is filled among cement particles, and then the pores formed after the mortar is hardened by redundant water are reduced, so that the structure of the thermal insulation mortar is more compact, and the performances of the thermal insulation mortar, such as the compressive strength, the bonding strength and the like, are improved.
By combining the example 3 and the comparative example 1, the dry density, the compressive strength, the linear shrinkage rate and the compression-shear bonding strength of the comparative example 1 without adding the modified ceramic tile polishing powder are obviously lower than those of the example 3 with adding the modified ceramic tile polishing powder, which shows that the dry density, the compressive strength, the linear shrinkage rate, the compression-shear bonding strength and other properties of the thermal insulation mortar can be obviously improved by the modified ceramic polishing powder.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The thermal insulation mortar is characterized by comprising the following components in parts by weight:
100-220 parts of cement;
40-80 parts of floating beads;
150-350 parts of modified ceramic polishing powder;
200-300 parts of ceramic sand;
5-20 parts of dispersible latex powder;
5-10 parts of a polycarboxylic acid water reducing agent;
5-10 parts of thickening powder; and
water;
the modified ceramic polishing powder is derived from ceramic polishing powder waste, and the activity of the modified ceramic polishing powder is more than or equal to 60 percent;
the preparation method of the modified ceramic polishing powder comprises the following steps:
and after drying and ball milling the ceramic polishing powder waste, adding a surface modifier solution into the polishing powder waste, stirring at 40-50 ℃, uniformly stirring to obtain a mixed solution, filtering the mixed solution, and drying and grinding the filtered solid to obtain the modified ceramic polishing powder.
2. The thermal insulation mortar of claim 1, which comprises the following components in parts by weight:
120-200 parts of cement;
50-70 parts of floating beads;
160-320 parts of modified ceramic polishing powder;
220-280 parts of pottery sand;
8-18 parts of dispersible latex powder;
6-8 parts of a polycarboxylic acid water reducing agent;
6-8 parts of thickening powder; and
and (3) water.
3. The thermal mortar of claim 1, further comprising, in parts by weight:
20-80 parts of fly ash;
2-16 parts of polypropylene fiber.
4. The thermal mortar of claim 1, wherein the cement comprises at least one of 42.5R Portland cement, pc32.5 Portland composite cement, and pc32.5 cement.
5. The thermal mortar of claim 1, wherein the ceramic sand comprises at least one of silt ceramic sand, electroceramic ceramic sand and fly ash ceramic sand.
6. The thermal mortar of claim 1, wherein the thickening powder comprises at least one of an inorganic thickener, a lignocellulosic thickener, an ether thickener, and a polyacrylate thickener.
7. The thermal mortar of claim 1, wherein the modified ceramic polishing powder has a specific surface area of>920m 2 Per kg, density of>2.58g/cm 3 。
8. The preparation method of the thermal insulation mortar is characterized by comprising the following steps:
the method comprises the following steps of physically stirring cement, floating beads, modified ceramic polishing powder and ceramic sand, and uniformly stirring to obtain a first mixture;
adding water into the first mixture, and uniformly stirring to obtain a second mixture;
adding dispersible latex powder, thickening powder and a polycarboxylic acid water reducing agent into the second mixture, and uniformly stirring to react to obtain thermal insulation mortar;
100-220 parts of cement; 40-80 parts of floating beads; 150-350 parts of modified ceramic polishing powder; 200-300 parts of ceramic sand; 5-20 parts of dispersible latex powder; 5-10 parts of a polycarboxylic acid water reducing agent; 5-10 parts of thickening powder;
the modified ceramic polishing powder is derived from ceramic polishing powder waste, and the activity of the modified ceramic polishing powder is more than or equal to 60 percent;
the preparation method of the modified ceramic polishing powder comprises the following steps:
and after drying and ball milling the ceramic polishing powder waste, adding a surface modifier solution into the polishing powder waste, stirring at 40-50 ℃, uniformly stirring to obtain a mixed solution, filtering the mixed solution, and drying and grinding the filtered solid to obtain the modified ceramic polishing powder.
9. The preparation method of the thermal mortar according to claim 8, wherein the mass ratio of the first mixture to the water is (7-10): (1-4).
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| KR101113750B1 (en) * | 2010-11-10 | 2012-02-20 | 니오가드(주) | Polishing loess granule mortar composition and flooring construction method using dry dust grinding |
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