CN112358262A - Anti-efflorescence concrete and preparation method thereof - Google Patents
Anti-efflorescence concrete and preparation method thereof Download PDFInfo
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- CN112358262A CN112358262A CN202011392866.3A CN202011392866A CN112358262A CN 112358262 A CN112358262 A CN 112358262A CN 202011392866 A CN202011392866 A CN 202011392866A CN 112358262 A CN112358262 A CN 112358262A
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- 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
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- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2023—Resistance against alkali-aggregate reaction
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- 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
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/82—Coloured materials
Abstract
The invention relates to a saltpetering-resistant concrete and a preparation method thereof. Relates to the field of building materials. The preparation raw materials of the anti-whiskering concrete comprise, by weight; 8-25 parts of cement; 60-90 parts of aggregate; 2-6 parts of admixture; 0.01-0.4 part of acrylate functional agent and 0.1-0.3 part of water reducing agent; water; the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers. The anti-whiskering concrete can effectively improve the whiskering phenomenon of the concrete on the basis of not influencing the compressive strength of the concrete, and meanwhile, has good construction performance.
Description
Technical Field
The invention relates to the field of building materials, in particular to a saltpetering-resistant concrete and a preparation method thereof.
Background
The whiskering is a common problem of concrete, affects the beauty of concrete products, limits the popularization and application of cement-based decorative concrete, reduces the durability of the concrete and causes potential safety hazards of structures.
Scientific researchers summarize the surface efflorescence process of cement-based decorative concrete: soluble salt in the concrete is dissolved in water, migrates to the surface along with capillary pores in the concrete, and white crystals are separated out on the surface of the concrete or are mixed with CO in the air2And the like to generate white precipitates. Soluble salts in concrete include two types: one is soluble salt contained in raw materials such as cement, sand, stone, additive and the like, such as CaCO3、CaSO4·2H2O、Na2O、K2O, etc. are precipitated on the concrete surfaceWhite crystals, forming crystalline whiskering; the other being produced by hydration of cement, e.g. Ca (OH)2It can be dissolved in trace water and can be mixed with CO in air2Reaction to form white CaCO3Precipitation and further formation of the phenomenon of efforescence. CaCO3 Is the main component of the whitening substance on the surface of the concrete.
The traditional alkali efflorescence resisting measures are that redispersible latex powder, cellulose ether and the like are added into concrete, and if the redispersible latex powder is used for complexing partial free calcium ions, the number of the free calcium ions is reduced, so that the alkali efflorescence phenomenon is reduced; the cellulose ether can hinder the free diffusion of free calcium ions in the concrete through the thickening and cohering effects, and further plays a role in inhibiting the concrete from efflorescence; however, the effect of the traditional anti-whiskering measures is not ideal, on one hand, the improvement effect on the whiskering phenomenon of concrete is limited, even though the redispersible latex powder and the cellulose ether are added, the obvious whiskering phenomenon still occurs after humidification and maintenance for a period of time, and the phenomenon is more obvious in color concrete; on the other hand, the addition of the redispersible latex powder and cellulose ether affects the compressive strength of concrete.
Disclosure of Invention
Aiming at the current situation, the invention provides the anti-whiskering concrete which can effectively improve the whiskering phenomenon of the concrete on the basis of not influencing the compressive strength of the concrete.
The preparation raw materials of the anti-whiskering concrete comprise, by weight;
8-25 parts of cement;
60-90 parts of aggregate;
2-6 parts of admixture;
0.01-0.4 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
water;
the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers.
In a preferred embodiment, the raw materials for preparing the anti-whiskering concrete comprise, by weight;
8-20 parts of cement;
65-82 parts of aggregate;
2-6 parts of admixture;
0.01-0.2 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
3-8 parts of water.
In a preferred embodiment, the acrylate monomer is selected from calcium acrylate and/or magnesium acrylate.
In a preferred embodiment, the acrylate polymer is selected from calcium polyacrylate and/or magnesium polyacrylate.
In a preferred embodiment, the particle size of the admixture is from 0.1 μm to 30 μm. The method is favorable for further reducing the porosity of the concrete and synergistically improving the saltpetering resistance of the concrete.
In a preferred embodiment, the admixture is selected from one or more of silica fume, slag powder, fly ash and metakaolin. It has hydration activity or porous adsorption capacity. On the one hand, the efflorescence of the concrete is reduced by adsorption of free calcium ions and, on the other hand, by reaction with the cement hydration products Ca (OH)2The secondary reaction is carried out to form gel, so that the number of free calcium ions of the concrete is reduced, and the occurrence of the whiskering phenomenon is reduced.
In a preferred embodiment, the cement is portland cement.
In a preferred embodiment, the aggregate is selected from sand and/or stone.
In a preferred embodiment, the raw materials for preparing the anti-efflorescence concrete further comprise a pigment.
In a preferred embodiment, the admixture is silica fume; the cement is portland cement; the aggregate is sand and stones; the raw materials for preparing the anti-efflorescence concrete also comprise pigment;
the preparation raw materials of the saltpetering-resistant concrete comprise, by weight:
8-20 parts of Portland cement;
30-40 parts of sand;
33-43 parts of stones;
2-6 parts of silica fume;
0.01-0.2 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
0.01-1 part of pigment;
3-8 parts of water.
The invention also provides a preparation method of the anti-saltpetering concrete.
The preparation method of the anti-efflorescence concrete comprises the following steps:
mixing cement, aggregate and admixture to prepare dry material;
mixing an acrylate functional agent, a water reducing agent and water to prepare a liquid material;
mixing the dry material and the liquid material;
8-25 parts of cement; 60-90 parts of aggregate; the weight part of the admixture is 2-6 parts; the weight part of the acrylate functional agent is 0.01-0.4; the weight part of the water reducing agent is 0.1-0.3;
the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers.
Compared with the prior art, the invention has the following beneficial effects:
according to the anti-efflorescence concrete, the acrylate functional agent, the admixture and the water reducing agent are added, the acrylate functional agent (acrylate monomer and/or acrylate polymer) has the functions of thickening and cohering of cellulose ether and the function of complexing part free calcium ions of the redispersible emulsion, and the amount of the free calcium ions is reduced through physical and chemical actions, so that the efflorescence phenomenon can be effectively inhibited; meanwhile, no matter the acrylate monomer or the acrylate polymer has good bonding effect with cement, and the acrylate monomer or the acrylate polymer is filled in pores among cement hydration products; and can be tightly combined with cement to form a three-dimensional net structure, and the compressive strength of the concrete can not be influenced after the cement is added. Moreover, because the acrylate functional agent aqueous solution has the property of pseudoplastic fluid, the fluidity can be changed to a certain degree by mechanical stirring after the acrylate functional agent aqueous solution is added into concrete, and the working performance of the concrete cannot be greatly influenced. On the basis, the admixture and the water reducing agent are added in a matched mode, the admixture can reduce the porosity of the concrete, and the saltpetering resistance of the concrete is improved in a synergistic mode. The water reducing agent can reduce the water consumption of concrete, is beneficial to enhancing the compressive strength of the concrete, and can also greatly increase the fluidity of the concrete. After the concrete is placed into a standard curing room with the temperature of 20 ℃ and the humidity of 98% for humidifying and curing, the surface has no obvious efflorescence phenomenon, the compressive strength is not obviously reduced, and meanwhile, the concrete also has good construction performance.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The anti-efflorescence concrete comprises the following preparation raw materials in parts by weight;
8-25 parts of cement;
60-90 parts of aggregate;
2-6 parts of admixture;
0.01-0.4 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
water;
the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers.
The acrylate functional agent (acrylate monomer and/or acrylate polymer) has the functions of thickening and cohering cellulose ether and complexing part free calcium ions of the redispersible emulsion, and reduces the amount of free calcium ions (such as calcium hydroxide) through physical and chemical actions, thereby effectively inhibiting the occurrence of the whiskering phenomenon; meanwhile, no matter the acrylate monomer or the acrylate polymer has good bonding effect with cement, and the acrylate monomer or the acrylate polymer is filled in pores among cement hydration products; and can be tightly combined with cement to form a three-dimensional net structure, and the compressive strength of the concrete can not be influenced after the cement is added. Moreover, because the acrylate functional agent aqueous solution has the property of pseudoplastic fluid, the fluidity can be changed to a certain degree by mechanical stirring after the acrylate functional agent aqueous solution is added into concrete, and the working performance of the concrete cannot be greatly influenced.
Preferably, the acrylate monomer is selected from calcium acrylate and/or magnesium acrylate.
Preferably, the acrylate polymer is selected from calcium polyacrylate and/or magnesium polyacrylate.
Taking calcium polyacrylate as an example, the structural formula of the calcium polyacrylate is as follows:
wherein n is 2.3-2.7 ten thousand.
It is understood that calcium polyacrylate is white powder and is easily soluble in water, the aqueous solution of calcium polyacrylate exhibits pseudoplastic fluid property, the viscosity of the solution is obviously reduced under high shearing force, and the rheological property is more obvious and the thixotropy is stronger when the polymerization degree is higher and the solution concentration is higher.
Meanwhile, on the basis of adding the acrylate functional agent, an admixture and a water reducing agent are added in a matching manner. The admixture can reduce the porosity of concrete and synergistically improve the saltpetering resistance of the concrete. The water reducing agent can reduce the water consumption of concrete, is beneficial to enhancing the compressive strength of the concrete, and can also greatly increase the fluidity of the concrete. After the concrete is placed in a standard curing room with the temperature of 20 ℃ and the humidity of 98% for humidification and curing for 7d, the surface has no obvious efflorescence phenomenon, which indicates that the efflorescence resistance of the concrete is effectively improved. And compared with a blank control, the 28d compressive strength is not obviously reduced, which indicates that the strength of the concrete is not influenced. Meanwhile, the concrete also has good construction performance.
Preferably, the particle size of the admixture is 0.1 μm to 30 μm. More preferably, the admixture is selected from one or more of silica fume, slag powder, fly ash and metakaolin. It has hydration activity or porous adsorption capacity. On the one hand, the efflorescence of the concrete is reduced by adsorption of free calcium ions and, on the other hand, by reaction with the cement hydration products Ca (OH)2The secondary reaction is carried out to form gel, so that the number of free calcium ions of the concrete is reduced, and the occurrence of the whiskering phenomenon is reduced.
The silica fume can be white silica fume, which is a type of industrial waste with pozzolanic activity. On one hand, the silica fume has larger specific surface area and can adsorb partial free calcium ions, thereby inhibiting the saltpetering performance of the concrete; on the other hand, the silica fume particles are in a micro-nanometer scale, and the particle size (the average particle size is 0.1 mu m) of the silica fume particles is far smaller than that of cement particles (the average particle size is 30 mu m), so that the silica fume can be doped into the silica fume particles to reduce capillary pores in the concrete and 'block' the way of separating free calcium ions out of the surface of the concrete. And the silica fume has higher activity and can be mixed with cement hydration products Ca (OH)2Performing a secondary reaction to reduce Ca (OH)2Thereby reducing the amount of free calcium ions and playing a role in inhibiting concrete whiskering. The concrete doped with 5 percent of silica fume (based on the total amount of the concrete) can reduce the pore volume of 28d from 0.20mL/g to 0.13mL/g。
Wherein the slag powder is preferably superfine slag powder with the particle size of 10-20 μm. The performance is similar to silica fume.
Wherein the fly ash is preferably fine ground fly ash with the particle size of 18-25 μm. The performance is similar to silica fume.
Preferably, the cement is portland cement. In one embodiment, the cement is a white portland cement, i.e., white cement.
Preferably, the aggregate is selected from sand and/or stones.
In one embodiment, the sand is river sand with a fineness modulus of 2-3.
In one embodiment, the stones are 5mm to 25mm continuous graded stones.
Preferably, the raw materials for preparing the anti-efflorescence concrete also comprise pigment. It will be appreciated that, after the addition of the pigment, a coloured concrete is obtained, in which case no significant efflorescence occurs. Preferably, the pigment is an inorganic pigment.
In a preferred embodiment, the raw materials for preparing the anti-whiskering concrete comprise the following components in parts by weight:
8-20 parts of Portland cement;
30-40 parts of sand;
33-43 parts of stones;
2-6 parts of silica fume;
0.01-0.2 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
0.01-1 part of pigment;
3-8 parts of water.
The concrete of the invention has no obvious efflorescence, high compressive strength and good construction performance.
The preparation method of the anti-efflorescence concrete comprises the following steps:
mixing cement, aggregate and admixture to prepare dry material;
mixing an acrylate functional agent, a water reducing agent and water to prepare a liquid material;
mixing the dry material and the liquid material;
8-25 parts of cement; 60-90 parts of aggregate; the weight part of the admixture is 2-6 parts; the weight part of the acrylate functional agent is 0.01-0.4; the weight part of the water reducing agent is 0.1-0.3;
the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers.
Preferably, after mixing the dry material and the liquid material, forcibly stirring the mixture to form a mixture with good fluidity.
When in use, the mixture is injected into a mould.
It will be appreciated that the forced mixing may be carried out in a forced mixer in which the mixing drum is stationary and the mixing action is intense as a result of the rotation of the blades on the rotating shaft within the drum to mix the material (and also as a result of the relative rotation of the mixing drum and blades to effect forced mixing). Except the forced mixer, also have from falling formula mixer, the churn of this kind of mixer is placed perpendicularly, and along with the churn rotates, the concrete mixture does free fall formula upset stirring in the churn to reach the purpose of stirring. In general, concrete mixing plants use forced mixers for mixing the concrete.
It is to be understood that the saltpetering resistant concrete of the present invention can be used for prefabricated exterior walls, or as fair-faced concrete, decorative concrete, and the like.
The following examples and comparative examples are further described below, and the starting materials used in the following examples can be commercially available, unless otherwise specified, and the equipment used therein can be commercially available, unless otherwise specified. The following examples and comparative examples used starting materials or their suppliers:
the cement is Arabic brand white cement with the label of 42.5; the water reducing agent is a polycarboxylic acid water reducing agent and is prepared from Guangdong Bihongteng building materials with limited technologyThe water reducing rate of the Spibincheng mixing station is 25 percent; the sand is river sand, the fineness modulus is 2.4, the mud content is 1%, and the sand is taken from Bihongteng stirring station of Guangdong Bihongteng building materials science and technology Limited company; the stones are 5-25mm continuous-grade stones, and are taken from Bihongteng stirring station of Guangdong Bihongteng building materials science and technology Limited company; the white silica has a mesh size of 8000-12500 meshes (the particle size range is 1-1.6 mu m), has a silicon content of more than 94 percent, and is purchased from Shandong Boken silicon materials Co., Ltd; the calcium polyacrylate white powder has a density of 1.62g/cm3Purchased from zhengzhou rongzhong chemical products limited; the magnesium acrylate is white powder, is purchased from Huai' an Xin Xuan Source New Material, and has a density of 1.15g/cm3。
Example 1
The embodiment provides a saltpetering-resistant concrete and a preparation method and a using method thereof, and the method comprises the following steps:
by weight, 15 parts of white cement, 0.5 part of inorganic pigment, 3 parts of white silica fume, 35 parts of sand, 39 parts of pebbles, 7 parts of water, 0.2 part of calcium polyacrylate and 0.3 part of water reducer are weighed.
Mixing cement, inorganic pigment, white silica fume, sand and stones to obtain a dry material.
Mixing the water reducing agent, water and calcium polyacrylate to obtain a liquid material.
And mixing the dry material and the liquid material, and forcibly stirring to form a mixture with good fluidity, namely the saltpetering resistant concrete.
When in use, the anti-efflorescence concrete is poured into a mould.
Example 2
The embodiment provides a saltpetering-resistant concrete and a preparation method and a using method thereof, and the method comprises the following steps:
by weight, 12 parts of white cement, 0.2 part of inorganic pigment, 2 parts of white silica fume, 38 parts of sand, 42 parts of pebble, 4.5 parts of water, 0.1 part of magnesium acrylate and 0.1 part of water reducing agent are weighed.
Mixing cement, inorganic pigment, white silica fume, sand and stones to obtain a dry material.
Mixing the water reducing agent, water and magnesium acrylate to obtain a liquid material.
And mixing the dry material and the liquid material, and forcibly stirring to form a mixture with good fluidity, namely the saltpetering resistant concrete.
When in use, the anti-efflorescence concrete is poured into a mould.
Example 3
The embodiment provides a saltpetering-resistant concrete and a preparation method and a using method thereof, and the method comprises the following steps:
weighing 18 parts by weight of white cement, 1 part by weight of inorganic pigment, 4 parts by weight of white silica fume, 32 parts by weight of sand, 35 parts by weight of pebble, 9.5 parts by weight of water, 0.1 part by weight of calcium polyacrylate, 0.1 part by weight of magnesium acrylate and 0.3 part by weight of water reducer.
Mixing cement, inorganic pigment, white silica fume, sand and stones to obtain a dry material.
Mixing the water reducing agent, water, magnesium acrylate and calcium polyacrylate to obtain a liquid material.
And mixing the dry material and the liquid material, and forcibly stirring to form a mixture with good fluidity, namely the saltpetering resistant concrete.
When in use, the anti-efflorescence concrete is poured into a mould.
Comparative example 1
This comparative example provides a saltpetering resistant concrete and method of making and using the same as example 3, except that calcium polyacrylate and magnesium acrylate are not added, and the amount of water is increased accordingly, as follows:
by weight, 18 parts of white cement, 1 part of inorganic pigment, 4 parts of white silica fume, 32 parts of sand, 35 parts of pebble, 9.7 parts of water and 0.3 part of water reducing agent are weighed.
Mixing cement, inorganic pigment, white silica fume, sand and stones to obtain a dry material.
And mixing the water reducing agent and water to obtain a liquid material.
And mixing the dry material and the liquid material, and forcibly stirring to form a mixture with good fluidity, namely the saltpetering resistant concrete.
When in use, the anti-efflorescence concrete is poured into a mould.
Comparative example 2
This comparative example provides a saltpetering resistant concrete and method of making and using the same as example 3, except that the amount of magnesium acrylate is increased and the amount of water is correspondingly decreased, as follows:
weighing 18 parts by weight of white cement, 1 part by weight of inorganic pigment, 4 parts by weight of white silica fume, 32 parts by weight of sand, 35 parts by weight of pebble, 8.6 parts by weight of water, 0.1 part by weight of calcium polyacrylate, 1 part by weight of magnesium acrylate and 0.3 part by weight of water reducing agent.
Mixing cement, inorganic pigment, white silica fume, sand and stones to obtain a dry material.
Mixing the water reducing agent, water, magnesium acrylate and calcium polyacrylate to obtain a liquid material.
And mixing the dry material and the liquid material, and forcibly stirring to form a mixture with good fluidity, namely the saltpetering resistant concrete.
When in use, the anti-efflorescence concrete is poured into a mould.
Comparative example 3
The comparative example provides a saltpetering-resistant concrete and a preparation method and a using method thereof, which are basically the same as the example 3, except that no water reducing agent is added, and the using amount of water is correspondingly increased, and the steps are as follows:
by weight, 18 parts of white cement, 1 part of inorganic pigment, 4 parts of white silica fume, 32 parts of sand, 35 parts of pebble, 9.8 parts of water, 0.1 part of calcium polyacrylate and 0.1 part of magnesium acrylate are weighed.
Mixing cement, inorganic pigment, white silica fume, sand and stones to obtain a dry material.
Mixing water, magnesium acrylate and calcium polyacrylate to obtain liquid material.
And mixing the dry material and the liquid material, and forcibly stirring to form a mixture with good fluidity, namely the saltpetering resistant concrete.
When in use, the anti-efflorescence concrete is poured into a mould.
Testing
The alkali-efflorescence resistant concrete prepared in the above examples and comparative examples was placed in a standard curing room at a temperature of 20 ℃ and a humidity of 98% for wet curing for 7 days. The surface efflorescence phenomenon of the product was observed and recorded, and the results are shown in table 1. The compressive strength of the saltpetering-resistant concrete 28d prepared in the above examples and comparative examples was tested according to the national referencesAccording to the standard GB/T50081 plus 2019 concrete physical and mechanical property test method standard, a test piece reaching the curing age is taken out of a standard curing chamber, the side surface of the test piece during molding is used as a pressure-bearing surface after the test size and the shape are qualified, the upper pressure-bearing surface and the lower pressure-bearing surface are wiped clean, the test piece is placed on a lower pressing plate or a base plate of a testing machine, the center of the test piece is aligned with the center of the lower pressing plate of the testing machine, the testing machine is started, and the surface of the test piece is in uniform contact with the upper pressure-bearing plate. Continuously and uniformly loading in the test process, wherein the loading speed is 0.3-1.0MPa/s, when the test piece is close to the damage and begins to deform rapidly, the pressurization is stopped manually (or the machine is stopped automatically), the damage load is recorded, and the formula f is adoptedcc= F/A calculated compressive strength, where FccThe compressive strength (MPa) of the concrete cubic test piece; f is the test piece failure load (N); a is the bearing area (mm) of the test piece2) And the calculation result is accurate to 0.1 MPa. The results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the efflorescence resistant concrete prepared in examples 1-3 has no obvious efflorescence phenomenon on the surface after being placed in a standard curing room with the temperature of 20 ℃ and the humidity of 98% for humidifying and curing for 7 days, which indicates that the efflorescence resistant performance of the concrete is effectively improved. And compared with the blank control of comparative example 1 without adding calcium polyacrylate and magnesium acrylate, the compressive strength of 28d is not obviously reduced, which indicates that the strength of the concrete is not influenced by adding proper amounts of calcium polyacrylate and magnesium acrylate. Furthermore, the concrete of examples 1 to 3 had good fluidity and could be normally constructed. In contrast, in comparative example 2, when the amount of magnesium acrylate was increased to 1 part, the workability was deteriorated, and although the concrete whiskering phenomenon was improved, the 28d compressive strength was significantly reduced due to the presence of a large amount of air bubbles after molding, and the concrete was likely to lose fluidity and be unable to be normally constructed due to the continuous increase of the amount of magnesium acrylate. Comparative example 3 no water reducing agent was added, more water was needed to maintain the working performance, and water evaporation left pores, which left channels for free calcium hydroxide, which was not good for improving the whiskering phenomenon.
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 (11)
1. The anti-efflorescence concrete is characterized by comprising the following preparation raw materials in parts by weight:
8-25 parts of cement;
60-90 parts of aggregate;
2-6 parts of admixture;
0.01-0.4 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
water;
the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers.
2. The anti-whiskering concrete according to claim 1, wherein the raw materials for the preparation thereof comprise, in parts by weight:
8-20 parts of cement;
65-82 parts of aggregate;
2-6 parts of admixture;
0.01-0.2 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
3-8 parts of water.
3. The anti-efflorescence concrete according to claim 2, wherein the acrylate monomer is selected from calcium acrylate and/or magnesium acrylate.
4. The anti-efflorescence concrete according to claim 2, wherein the acrylate polymer is selected from calcium polyacrylate and/or magnesium polyacrylate.
5. The saltpetering resistant concrete according to any one of claims 1 to 4, wherein the admixture has a particle size of 0.1 μm to 30 μm.
6. The anti-efflorescence concrete according to claim 5, wherein the admixture is selected from one or more of silica fume, slag powder, fly ash and metakaolin.
7. The saltpetering resistant concrete according to any one of claims 1 to 4, wherein the cement is portland cement.
8. The saltpetering resistant concrete according to any one of claims 1 to 4, characterized in that the aggregate is selected from sand and/or stones.
9. The saltpetering resistant concrete according to any one of claims 1 to 4, wherein the raw materials for the production of the saltpetering resistant concrete further comprise a pigment.
10. The saltpetering resistant concrete of any one of claims 1 to 4 wherein the admixture is silica fume; the cement is portland cement; the aggregate is sand and stones; the raw materials for preparing the anti-efflorescence concrete also comprise pigment;
the preparation raw materials of the saltpetering-resistant concrete comprise, by weight:
8-20 parts of Portland cement;
30-40 parts of sand;
33-43 parts of stones;
2-6 parts of silica fume;
0.01-0.2 part of acrylate functional agent;
0.1-0.3 part of water reducing agent;
0.01-1 part of pigment;
3-8 parts of water.
11. The preparation method of the anti-whiskering concrete is characterized by comprising the following steps:
mixing cement, aggregate and admixture to prepare dry material;
mixing an acrylate functional agent, a water reducing agent and water to prepare a liquid material;
mixing the dry material and the liquid material;
8-25 parts of cement; 60-90 parts of aggregate; the weight part of the admixture is 2-6 parts; the weight part of the acrylate functional agent is 0.01-0.4; the weight part of the water reducing agent is 0.1-0.3;
the acrylate functional agent is selected from acrylate monomers and/or acrylate polymers.
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| CN202011392866.3A Active CN112358262B (en) | 2020-12-03 | 2020-12-03 | Anti-efflorescence concrete and preparation method thereof |
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| CN114180861A (en) * | 2021-11-16 | 2022-03-15 | 华润水泥技术研发有限公司 | Anti-efflorescence gel material |
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| CN101885595A (en) * | 2009-05-14 | 2010-11-17 | 郑州恒昊玻璃技术有限公司 | Glass gluing material for architectural decoration |
| CN110105024A (en) * | 2019-06-13 | 2019-08-09 | 广州市泰和混凝土有限公司 | Normal concrete |
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| CN101885595A (en) * | 2009-05-14 | 2010-11-17 | 郑州恒昊玻璃技术有限公司 | Glass gluing material for architectural decoration |
| CN110105024A (en) * | 2019-06-13 | 2019-08-09 | 广州市泰和混凝土有限公司 | Normal concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114180861A (en) * | 2021-11-16 | 2022-03-15 | 华润水泥技术研发有限公司 | Anti-efflorescence gel material |
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