CN112897978A - Self-healing waterproof anti-permeability mortar and preparation method thereof - Google Patents
Self-healing waterproof anti-permeability mortar and preparation method thereof Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 95
- 230000003487 anti-permeability effect Effects 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 22
- 239000007767 bonding agent Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 14
- 239000011707 mineral Substances 0.000 claims abstract description 14
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 36
- 239000002518 antifoaming agent Substances 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 25
- 241001474374 Blennius Species 0.000 claims description 23
- 244000005700 microbiome Species 0.000 claims description 22
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 20
- 235000019353 potassium silicate Nutrition 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 235000015097 nutrients Nutrition 0.000 claims description 17
- 229910021487 silica fume Inorganic materials 0.000 claims description 14
- 239000004202 carbamide Substances 0.000 claims description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 8
- 159000000007 calcium salts Chemical class 0.000 claims description 7
- 239000010451 perlite Substances 0.000 claims description 6
- 235000019362 perlite Nutrition 0.000 claims description 6
- 239000010455 vermiculite Substances 0.000 claims description 6
- 229910052902 vermiculite Inorganic materials 0.000 claims description 6
- 235000019354 vermiculite Nutrition 0.000 claims description 6
- 241000193386 Lysinibacillus sphaericus Species 0.000 claims description 4
- 241000193469 Clostridium pasteurianum Species 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 16
- 239000011083 cement mortar Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 239000011398 Portland cement Substances 0.000 description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 235000010755 mineral Nutrition 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 description 7
- 239000001639 calcium acetate Substances 0.000 description 7
- 235000011092 calcium acetate Nutrition 0.000 description 7
- 229960005147 calcium acetate Drugs 0.000 description 7
- 108010046334 Urease Proteins 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229940044172 calcium formate Drugs 0.000 description 3
- 239000004281 calcium formate Substances 0.000 description 3
- 235000019255 calcium formate Nutrition 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical compound [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 description 2
- 239000001527 calcium lactate Substances 0.000 description 2
- 229960002401 calcium lactate Drugs 0.000 description 2
- 235000011086 calcium lactate Nutrition 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000002503 metabolic effect Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 241000179039 Paenibacillus Species 0.000 description 1
- 241000606860 Pasteurella Species 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 241000193395 Sporosarcina pasteurii Species 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229910052914 metal silicate Inorganic materials 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to the technical field of waterproof mortar materials, and particularly relates to self-healing waterproof anti-permeability mortar and a preparation method thereof. The self-healing waterproof impervious mortar comprises the following raw materials: cement, mineral admixture, sand, water, bonding agent, repairing agent and auxiliary agent; the self-healing waterproof anti-permeability mortar prepared by the invention has good compactness, waterproofness and anti-permeability, the preparation method is simple, the cost is low, the waterproof anti-permeability performance is improved, and the workability and the strength performance of the construction are not influenced.
Description
Technical Field
The invention belongs to the technical field of waterproof mortar materials, and particularly relates to self-healing waterproof anti-permeability mortar and a preparation method thereof.
Background
The cement mortar is a kind of adhesive material used in construction and is made up by mixing a certain proportion of fine aggregate with cement. In general, micro cracks exist in the interior and on the surface of the formed mortar, and the micro cracks can be used as passages for water and harmful substances to enter the mortar, so that the impermeability and the strength of the mortar are reduced, and the durability of the mortar masonry is seriously damaged.
The bonding agent is a material bonded by various bonding agents and abrasive materials in the bonded abrasive tool, the repairing agent can be used for repairing microcracks formed on the surface of the formed mortar, and the bonding agent and the repairing agent are combined to play a role in inhibiting crack propagation and filling microcracks, so that the waterproofness and the impermeability are improved, and no relevant report exists at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide self-healing waterproof anti-permeability mortar and a preparation method thereof, wherein the self-healing waterproof anti-permeability mortar has good compactness, waterproofness and anti-permeability; the preparation method is simple and low in cost, and the construction workability and the strength performance of the waterproof and anti-permeability material are not influenced while the waterproof and anti-permeability performance is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the self-healing waterproof anti-permeability mortar comprises the following raw materials: cement, mineral admixture, sand, water, bonding agent, repairing agent and auxiliary agent.
Preferably, the mineral admixture comprises one or more of fly ash, mineral powder and silica fume.
Preferably, the bonding agent comprises seaweed powder and water glass, and the mass ratio of the seaweed powder to the water glass is (1: 5) - (1: 1).
Further preferably, the modulus of the water glass is 3.1 to 3.4.
More preferably, the viscosity of the seaweed powder is 20 ten thousand, and the seaweed powder is water-free S70 seaweed powder.
Preferably, the repairing agent comprises lightweight aggregate, microorganisms and nutrients; the mass ratios of the lightweight aggregate, the microorganism and the nutrient in the repairing agent are respectively 45-60%, 15-20% and 20-40%.
Preferably, the lightweight aggregate is one or two of expanded perlite and expanded vermiculite; the microorganism is one or two of bacillus pasteurianus and bacillus sphaericus; the nutrient is urea and soluble calcium salt, and the molar ratio of the urea to the soluble calcium salt is 1: 1.
Further preferably, the soluble calcium salt is one or more of calcium acetate, calcium formate, calcium acetate or calcium lactate.
Preferably, the auxiliary agent comprises a water reducing agent and a defoaming agent, and the mass ratio of the water reducing agent to the defoaming agent is 1: 1.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent; the defoaming agent is an organic silicon defoaming agent.
Further preferably, the fineness modulus of the sand is 2.4-2.7.
Further preferably, the particle size of the silica fume is 120-200 meshes.
Preferably, the raw materials are used in the following amounts: 80-100 parts of cement, 10-20 parts of mineral admixture, 250-350 parts of sand, 70-90 parts of water, 5-10 parts of binding agent, 5-10 parts of repairing agent and 2-3 parts of auxiliary agent.
(II) a preparation method of self-healing waterproof anti-permeability mortar, which comprises the following steps:
step 1, uniformly mixing water, cement, mineral admixture, sand and an auxiliary agent to obtain a mixed system A;
and 2, sequentially adding the repairing agent and the bonding agent into the mixed system A, and uniformly stirring at room temperature to obtain the self-healing waterproof anti-permeability mortar.
Preferably, in the step 2, the stirring time is 2-5 min.
The invention can produce the beneficial effects that:
1) according to the invention, silica fume, a repairing agent, a bonding agent and an auxiliary agent are added on the basis of common mortar, the silica fume has small granularity, and can be filled in gaps in the mortar, so that the hardened cement paste is more compact, and meanwhile, a product generated by secondary hydration of the silica fume can block a permeation channel in the cement paste, thereby being beneficial to improving the anti-permeability capability of a cement base material, greatly improving the waterproof and anti-permeability effects, meeting the engineering requirements and improving the engineering quality.
2) The bonding agent comprises seaweed powder and water glass, wherein the seaweed powder is an adhesive substance and has strong adhesive capacity after being dissolved in water; the water glass is a metal silicate substance which is formed by combining alkali metal oxide and silicon dioxide and can be dissolved in water, has good cohesiveness, and silicic acid gel precipitated when the cement paste is hardened can block pores, so that water is prevented from permeating into the pores. The seaweed powder and the water glass play a role in bonding at the initial stage of crack generation in the cement paste hardening process, and crack expansion is prevented.
3) The repairing agent comprises lightweight aggregate, microorganisms and nutrients, wherein the lightweight aggregate has the characteristics of rough surface porosity, strong water absorption and the like, the concrete is internally provided with a high-alkalinity environment, the pH value of the concrete can reach 12-13, the concrete is compacted by hydration of cement, the living space of the microorganisms is extruded, the microorganism can be coated by the porous structure in the concrete, the damage of the high-alkalinity environment to the concrete is reduced, the living space can be provided for the concrete, a good metabolic site can be provided for the microorganisms in the formed mortar test block, and the effect of protecting the microorganisms is achieved; the microorganism metabolizes to generate urease, and the urease hydrolyzes urea to generate NH3And CO2，NH3The generation of (A) results in an increase in the pH of the environment inside the mortar test block, the alkaline condition further being able to drive CO2Conversion to carbonate ions, followed by carbonate ions and Ca in the surrounding solution2+The reaction produces calcium carbonate precipitate.
4) The auxiliary agent comprises a water reducing agent and a defoaming agent, wherein the water reducing agent adopts a polycarboxylic acid water reducing agent, and the polycarboxylic acid water reducing agent has a dispersing effect on cement particles after being added into a concrete mixture, so that the workability of the polycarboxylic acid water reducing agent can be improved, the unit water consumption can be reduced, the fluidity of the concrete mixture can be improved, and the strength of concrete can be improved; the defoaming agent is an organic silicon defoaming agent, so that the generation of foam in a cement mortar system can be effectively controlled, and the concrete member is more compact and bright.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a scanning electron microscope image of a mortar test block formed by the self-healing waterproof and anti-permeability mortar prepared in example 1 for 7 days;
FIG. 2 is a scanning electron microscope image of a mortar sample obtained by molding the cement mortar obtained in comparative example 1 of the present invention for 7 d.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
The self-healing waterproof anti-permeability mortar provided by the invention is prepared from the raw materials of cement, mineral admixture, sand, water, bonding agent, repairing agent and auxiliary agent, wherein the cement is Portland cement with the label not less than 42.5 or ordinary Portland cement with the label not less than 42.5; the mineral admixture comprises one or more of fly ash, mineral powder and silica fume; the fineness modulus of the sand is 2.4-2.7; the granularity of the silica fume is 120-200 meshes;
the bonding agent comprises seaweed powder and water glass in a mass ratio of (1: 5) - (1: 1), the viscosity of the seaweed powder is 20 ten thousand, the seaweed powder is water-free S70 seaweed powder, and the modulus of the water glass is 3.1-3.4, wherein the seaweed powder is an adhesive substance and has strong adhesive capacity after being dissolved in water; the water glass used in the invention is the water solution of sodium silicate, has good cohesiveness, and the silicic acid gel precipitated during hardening can block the pores to prevent water from permeating, namely, the seaweed powder and the water glass both have good cohesiveness, and have good sealing effect on cracks, pores and the like in the process of forming the concrete mortar into a test block.
The repairing agent comprises lightweight aggregate, microorganisms and nutrients, wherein the lightweight aggregate is one or two of expanded perlite and expanded vermiculite, the microorganisms are one or two of bacillus pasteurianus and bacillus sphaericus, the nutrients are urea and soluble calcium salt with a molar ratio of 1:1, the soluble calcium salt is one or more of calcium acetate, calcium formate, calcium acetate or calcium lactate, and specifically, the expanded perlite or expanded vermiculite and the like which are the lightweight aggregate have the characteristics of rough surface, strong water absorption and the like, can provide a good metabolic site for the microorganisms, and the microorganisms have the following effects:
first, the microorganisms metabolize to produce urease, which hydrolyzes urea to NH3And CO2The generation of ammonia gas causes the pH value in the environment inside the mortar test block to rise and the inside of the concrete is a strong alkaline environment, the alkaline condition can further convert carbon dioxide into carbonate ions, and then the carbonate ions can react with Ca in the water environment2+Reacting to generate calcium carbonate precipitate to be filled in the cracks, thereby realizing the repair of the cracks, and the specific reaction formula is as follows:
second, the microorganisms provide nucleation sites for the deposition of calcium carbonate.
The auxiliary agent comprises a water reducing agent and a defoaming agent in a mass ratio of 1:1, the water reducing agent is a polycarboxylic acid water reducing agent, specifically is a basf 10 polycarboxylic acid water reducing agent, and after the concrete mixture is added, the water reducing agent has a dispersing effect on cement particles, so that the workability of the concrete mixture can be improved, the unit water consumption is reduced, the fluidity of the concrete mixture is improved, and the strength of the concrete is improved; the defoamer is an organic silicon defoamer, particularly ww-863 organic silicon defoamer, and can effectively control the generation of foam in a cement mortar system, so that the concrete member is more compact and bright.
In the process of preparing the self-healing waterproof anti-permeability mortar, the seaweed meal and the water glass perform a cementing function in the early stage of mortar forming, and the formation of early strength of a mortar test block is facilitated. With the progress of cement hydration, the strength of the cement is gradually increased, and the repairing agent gradually plays a role; in addition, in the process, the generated calcium carbonate has the function of filling and repairing the cracks of the test block formed by the self-healing mortar in a strong alkaline mortar environment by microorganisms.
Therefore, the self-healing waterproof anti-permeability mortar is prepared by the mutual synergistic effect of the raw materials and the reasonable weight ratio of the raw materials, so that the waterproof and anti-permeability effects of the self-healing waterproof anti-permeability mortar are met, the engineering requirements are met, and the engineering quality is improved.
The self-healing waterproof anti-permeability mortar prepared in the examples 1 to 3 and the cement mortar prepared in the comparative examples 1 to 3 are tested for performance parameters, and the effect of the self-healing waterproof anti-permeability mortar is compared with that of the cement mortar, and the test results are as follows:
example 1
A preparation method of self-healing waterproof anti-permeability mortar comprises the following steps:
step 1, uniformly mixing 117g of water, 432g of 42.5 g of ordinary portland cement, 1350g of sand with the fineness modulus of 2.5, 18g of silica fume, 4.5g of water reducing agent and 4.5g of defoaming agent to obtain a mixed system A, wherein the water reducing agent is a basf 10 polycarboxylate water reducing agent, and the defoaming agent is a ww-863 organic silicon defoaming agent;
and 2, sequentially adding 9g of repairing agent and 2.7g of binding agent into the mixed system A, and stirring for 5min at room temperature to obtain the self-healing waterproof and anti-permeability mortar, wherein the mass ratio of expanded vermiculite, Paenibacillus pasteurianus and nutrients in the repairing agent is 60%, 20% and 20%, the molar ratio of calcium acetate and urea in the nutrients is 1:1, and the mass ratio of S70 seaweed powder and water glass with the modulus of 3.4 in the binding agent is 1: 5.
Example 2
A preparation method of self-healing waterproof anti-permeability mortar comprises the following steps:
step 1, uniformly mixing 126g of water, 432g of 42.5 g of ordinary portland cement, 1350g of sand with the fineness modulus of 2.5, 18g of silica fume, 4.5g of water reducing agent and 4.5g of defoaming agent to obtain a mixed system A, wherein the water reducing agent is a basf 10 polycarboxylic acid water reducing agent, and the defoaming agent is a ww-863 organic silicon defoaming agent;
step 2, sequentially adding 10g of repairing agent and 2.7g of binding agent into the mixed system A, and stirring for 5min at room temperature to obtain the self-healing waterproof and anti-permeability mortar, wherein the mass ratio of expanded perlite to bacillus pasteurii to the nutrient in the repairing agent is 60%, 20% and 20%, the molar ratio of calcium formate to urea in the nutrient is 1:1, and the mass ratio of S70 seaweed powder to water glass with the modulus of 3.1 in the binding agent is 1: 5.
example 3
A preparation method of self-healing waterproof anti-permeability mortar comprises the following steps:
step 1, uniformly mixing 135g of water, 432g of 42.5 g of ordinary portland cement, 1350g of sand with the fineness modulus of 2.5, 18g of silica fume, 4.5g of water reducing agent and 4.5g of defoaming agent to obtain a mixed system A, wherein the water reducing agent is a basf 10 polycarboxylic acid water reducing agent, and the defoaming agent is a ww-863 organic silicon defoaming agent;
and 2, sequentially adding 10g of repairing agent and 2.7g of binding agent into the mixed system A, and stirring for 2min at room temperature to obtain the self-healing waterproof and anti-permeability mortar, wherein the mass ratio of expanded perlite to bacillus sphaericus to nutrients in the repairing agent is 45%, 15% and 40%, the molar ratio of calcium acetate to urea in the nutrients is 1:1, and the mass ratio of S70 seaweed powder to water glass with the modulus of 3.4 in the binding agent is 1: 2.
Comparative example 1
A preparation method of self-healing waterproof anti-permeability mortar comprises the following steps:
step 1, uniformly mixing 117g of water, 432g of 42.5 g of ordinary portland cement, 1350g of sand with the fineness modulus of 2.5, 18g of silica fume, 4.5g of water reducing agent and 4.5g of defoaming agent to obtain cement mortar B, wherein the water reducing agent is a basf 10 polycarboxylic acid water reducing agent, and the defoaming agent is a ww-863 organic silicon defoaming agent;
comparative example 2
A preparation method of self-healing waterproof anti-permeability mortar comprises the following steps:
step 1, uniformly mixing 117g of water, 432g of 42.5 g of ordinary portland cement, 1350g of sand with the fineness modulus of 2.5, 18g of silica fume, 4.5g of water reducing agent and 4.5g of defoaming agent to obtain a mixed system A, wherein the water reducing agent is a basf 10 polycarboxylate water reducing agent, and the defoaming agent is a ww-863 organic silicon defoaming agent;
and 2, adding 9g of repairing agent into the mixed system A, and stirring for 5min at room temperature, wherein the mass ratio of expanded vermiculite to the pasteurella to the nutrient in the repairing agent is 60%, 20% and 20%, respectively, and the molar ratio of calcium acetate to urea in the nutrient is 1:1, so as to obtain cement mortar C.
Comparative example 3
A preparation method of self-healing waterproof anti-permeability mortar comprises the following steps:
step 1, uniformly mixing 117g of water, 432g of 42.5 g of ordinary portland cement, 1350g of sand with the fineness modulus of 2.5, 18g of silica fume, 4.5g of water reducing agent and 4.5g of defoaming agent to obtain a mixed system A, wherein the water reducing agent is a basf 10 polycarboxylate water reducing agent, and the defoaming agent is a ww-863 organic silicon defoaming agent;
and 2, adding 2.7g of a bonding agent into the mixed system A, and stirring for 5min at room temperature to obtain cement mortar D, wherein the mass ratio of S70 seaweed powder in the bonding agent to water glass with the modulus of 3.4 is 1: 5.
In the above examples, the self-healing waterproof and impervious mortar obtained in examples 1 to 3, the cement mortar obtained in comparative examples 1 to 3, and the ordinary portland cement with the cement designation of 42.5 were tested for their compressive strength, flexural strength, impervious designation, water absorption ratio, and influence on corrosion of reinforcing steel bars, respectively, according to the pouring method specified in JGJ/T70-2009 "standard for basic performance test method of building mortar", and the test results are shown in table 1:
TABLE 1 Performance data for examples 1-3 and comparative examples 1-3
As can be seen from Table 1, the self-healing water-proofing and anti-permeability mortar obtained in examples 1 to 3 has a smaller change in compressive strength, an increased flexural strength and a significantly decreased water absorption after curing for 7 days, compared with the mortar obtained in comparative examples 1 to 3, which indicates that the self-healing water-proofing and anti-permeability mortar prepared according to the present invention has significantly improved water resistance and anti-permeability properties.
Scanning electron microscope tests are carried out on the mortar test block formed in the 7d age period in the example 1 and the mortar test block formed in the 7d age period in the comparative example 1, and the results are shown in the figures 1 and 2 respectively.
As can be seen from fig. 1, the pores of the self-healing waterproof and impervious mortar with the age of 7d prepared in example 1, which is molded into the mortar test block, are significantly reduced, which indicates that the internal structure of the mortar test block cast by the self-healing waterproof and impervious mortar is more compact, because the seaweed powder and the water glass have a bonding effect during the molding process of the self-healing waterproof and impervious mortar, the hydration products are contacted more tightly and firmly, and simultaneously, the pores in the mortar test block are filled with calcium carbonate generated by the induction of the microorganisms in the repairing agent, so that the pores are fewer, and the structure of the molded mortar test block is more compact.
As can be seen from FIG. 2, the mortar-cast mortar sample prepared in comparative example 1, which had an age of 7d, had a loose internal structure, many pores and was not dense.
As can be seen from fig. 1 and 2, compared with the common cement mortar, the self-healing waterproof impervious mortar prepared by the invention has better compactness, waterproofness and impermeability. The bonding agent added into the mortar can play a role in bonding in formed cracks to prevent crack propagation in the initial stage of pouring and forming the self-healing waterproof impervious mortar into a mortar test block, and microorganisms contained in the repairing agent added into the mortar can induce the generation of calcium carbonate which is used for filling the cracks after the cracks are generated. Therefore, the self-healing waterproof anti-permeability mortar prepared by the invention has good compactness, waterproofness and anti-permeability; the preparation method is simple and low in cost, and the waterproof and anti-permeability performance is improved without influencing the construction workability and the strength performance.
The method judges whether the cracks on the mortar test block are filled completely along with the increase of the age of the mortar test block by comparing the crack widths of the same mortar test block in different ages so as to represent the repairing effect of the cracks of the mortar test block. Specifically, the crack widths of the mortar test block 1 corresponding to example 1, the mortar test block 2 corresponding to example 2, and the mortar test block 3 corresponding to example 3 in different ages were measured in sequence by using a concrete crack width measuring instrument, 5 points were uniformly selected from one crack, an average value was obtained, the crack width of each test block was obtained, the unit of the crack width was mm, and finally, the average value was obtained, and the test results are shown in table 2.
Table 2 fracture widths of different ages of mortar test blocks corresponding to examples 1-3
| Item | 0d | 5d | 40d |
| Mortar test block 1 | 1.03 | 0.45 | 0 |
| Mortar test block 2 | 1.10 | 0.39 | 0 |
| Mortar test block 3 | 1.05 | 0.51 | 0 |
| Mean value of | 1.06 | 0.45 | 0 |
As can be seen from table 2, as the mortar sample age increased, the width of the cracks became smaller, and the cracks on the surface were completely filled with calcium carbonate crystals at about 40d, thereby effectively preventing harmful substances from entering the inside of the concrete.
In conclusion, in the early stage of forming the self-healing waterproof and anti-permeability mortar, the seaweed powder and the water glass play a role in cementation, the formation of the early strength of a mortar test block is facilitated, the repairing agent gradually plays a role along with the progress of cement hydration, microorganisms secrete urease during metabolism, and the urease hydrolyzes urea to generate NH3And CO2，NH3The generation of (A) causes the pH value of the internal environment of the mortar test block to rise and the internal environment of the mortar test block is originally a strong alkaline environment, and CO is generated under the alkaline condition2Will be converted into CO3 2-Then CO3 2-Can react with Ca in the water environment2+And reacting to generate calcium carbonate precipitate at the crack. Therefore, the self-healing waterproof anti-permeability mortar can greatly improve the waterproof and anti-permeability effects, meet the engineering requirements and improve the engineering quality.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The self-healing waterproof anti-permeability mortar is characterized by comprising the following raw materials: cement, mineral admixture, sand, water, bonding agent, repairing agent and auxiliary agent.
2. A self-healing waterproof and impervious mortar according to claim 1, wherein said mineral admixture comprises one or more of fly ash, mineral powder and silica fume.
3. The self-healing waterproof and anti-permeability mortar according to claim 1, wherein the bonding agent comprises seaweed powder and water glass, and the mass ratio of the seaweed powder to the water glass is (1: 5) - (1: 1).
4. A self-healing waterproof and impervious mortar according to claim 1, wherein said repair agent comprises lightweight aggregate, microorganisms and nutrients;
the mass ratios of the lightweight aggregate, the microorganism and the nutrient in the repairing agent are respectively 45-60%, 15-20% and 20-40%.
5. The self-healing waterproof and impervious mortar according to claim 4, wherein the lightweight aggregate is one or both of expanded perlite and expanded vermiculite;
the microorganism is one or two of bacillus pasteurianus and bacillus sphaericus;
the nutrient is urea and soluble calcium salt, and the molar ratio of the urea to the soluble calcium salt is 1: 1.
6. The self-healing waterproof and anti-permeability mortar according to claim 1, wherein the auxiliary agent comprises a water reducing agent and a defoaming agent, and the mass ratio of the water reducing agent to the defoaming agent is 1: 1.
7. The self-healing waterproof and anti-permeability mortar according to claim 6, wherein the water reducing agent is a polycarboxylic acid water reducing agent;
the defoaming agent is an organic silicon defoaming agent.
8. The self-healing waterproof and anti-permeability mortar according to claim 1, wherein the raw materials are used in amounts of: 80-100 parts of cement, 10-20 parts of mineral admixture, 250-350 parts of sand, 70-90 parts of water, 5-10 parts of binding agent, 5-10 parts of repairing agent and 2-3 parts of auxiliary agent.
9. A preparation method of self-healing waterproof anti-permeability mortar is characterized by comprising the following steps:
step 1, uniformly mixing water, cement, mineral admixture, sand and an auxiliary agent to obtain a mixed system A;
and 2, sequentially adding the repairing agent and the bonding agent into the mixed system A, and uniformly stirring at room temperature to obtain the self-healing waterproof anti-permeability mortar.
10. The method for preparing self-healing waterproof and anti-permeability mortar according to claim 9, wherein in the step 2, the stirring time is 2-5 min.
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