CN112679190B - Reinforcing waterproof mortar for filling concrete bottom cavity - Google Patents
Reinforcing waterproof mortar for filling concrete bottom cavity Download PDFInfo
- Publication number
- CN112679190B CN112679190B CN202110080602.2A CN202110080602A CN112679190B CN 112679190 B CN112679190 B CN 112679190B CN 202110080602 A CN202110080602 A CN 202110080602A CN 112679190 B CN112679190 B CN 112679190B
- Authority
- CN
- China
- Prior art keywords
- parts
- concrete
- water glass
- mortar
- waterproof mortar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The invention discloses a reinforced waterproof mortar for filling a cavity at the bottom of concrete, which comprises the following components in parts by weight: 80-100 parts of cement, 25-35 parts of graded sand, 20-30 parts of polymer emulsion, 5-7 parts of active substances, 8-10 parts of water glass, 5-8 parts of modified sodium bentonite, 1.0-1.5 parts of triethanolamine and 0.5-1.0 part of penetrating agent; the active substance is a self-polycondensation crystallization reactant, and polycondensation crystals occur under the condition of water. The reinforced waterproof slurry has certain viscosity and certain fluidity, so that the slurry can be diffused around a filling part, and simultaneously the slurry is diffused into gaps to generate crystal filling gaps. The method can be applied to waterproof construction of concrete bottom cavity filling, and can also be applied to leakage stoppage construction of structural cracking, water seepage points and holes, and waterproof and leakage stoppage construction of subway stations, underground continuous walls, tunnels, culverts and reservoir dams.
Description
Technical Field
The invention belongs to the technical field of concrete repair materials, and mainly relates to a reinforced waterproof mortar for filling a cavity at the bottom of concrete.
Background
The concrete at the bottom of a water storage pool, a sedimentation pool and a neutralization pool of a sewage treatment plant, a reaction pool, a cooling pool and a sewage pool of a chemical plant, a thermal power plant and other places is easy to generate a cavity and water seepage phenomenon at the bottom under the corrosion of strong acid, strong alkali and high-salinity water for a long time, and the service life is seriously influenced. At present, the repair materials for concrete cracks are mainly divided into three types, namely inorganic repair materials, organic repair materials and organic-inorganic composite repair materials. The inorganic repair material mainly refers to a cement-based repair material, the application range of the inorganic repair material is the most extensive, the technology is correspondingly mature, but the bonding performance is not good in the application process; the organic repairing material takes organic matters with certain repairing characteristics as a repairing main agent, organic matters such as a toughening agent, an initiator, a coupling agent and the like are blended together, so that the organic repairing material has the effect of repairing concrete cracks; the organic-inorganic composite repairing material which is composed of the inorganic material as the matrix and the organic substance as the auxiliary material can improve the bonding property of the inorganic repairing material, and simultaneously, the good flexibility of the organic material can endow the repairing material with better fluidity.
The application of the waterproof mortar is very common in the field of buildings, at present, more cement-based capillary crystalline waterproof mortar is used, and the principle that calcium silicate crystals are formed by mainly utilizing the chemical and catalytic enzyme actions among silicate ions, calcium ions and hydroxide ions in concrete is utilized. CN103755286B discloses an efficient cement-based capillary crystalline waterproof mortar, which comprises the following raw materials in parts by weight: 55% of Portland cement, 17% of high-activity master batch, 25% of quartz sand, 1% of catalyst and 2% of dispersing agent; the high-activity master batch has a molecular structure of Ca (OROH)2The active substance of (1); the catalyst is methyl cellulose ether with molecular weight of 6-8 ten thousand. The waterproof mortar can only repair fine cracks, so that the effect of treating larger cracks is poor, and other waterproof mortar is needed, so that the application range of the waterproof mortar is limited. In addition, there is also a cement-based rigid waterproof material which is a waterproof mortar formed mainly by using cement as a base material and then mixing a water repellent, a gel material and the like. CN101234874B discloses a cement-based rigid waterproof material, which is prepared by mixing raw materials of cement, a superfine siliceous mineral admixture, a salic mineral admixture, a water repellent, siliceous fine sand, a high-efficiency water release admixture, a superplasticizer and an anti-cracking agent; the mass number of each raw material is as follows: 6 to 8 parts of cement, 0.6 to 1 part of superfine siliceous mineral admixture, 1.5 to 3 parts of alumino-silica mineral admixture, 0.24 to 0.4 part of water repellent, 11 to 14 parts of siliceous fine sand, 0.1 to 0.3 part of high-efficiency water-releasing admixture and 0.08 to up to 0 DEG of superplasticizer0.10 part of anti-cracking agent and 0.01-0.03 part of anti-cracking agent. The waterproof material has good deformation coordination performance with a base material, good crack resistance and lower cost, but is mainly used for parts with lower waterproof grade and cannot be independently used as a waterproof layer. Therefore, in view of the current situation of the current waterproof mortar, a waterproof mortar with good comprehensive performance and wide application range is urgently needed.
The cavity at the bottom of the concrete is filled, and the used waterproof mortar needs to have better deformation coordination capability with the original concrete, good anti-cracking and water seepage-proofing performance and also needs to have the function of self-healing of micro cracks. Therefore, it is necessary to research and develop a reinforced waterproof mortar for filling the cavity at the bottom of the concrete, which has the characteristics of good waterproofness, self-healing of micro cracks, infiltration crystallization and the like.
Disclosure of Invention
The invention aims to provide a reinforced waterproof mortar for filling a concrete bottom cavity, which has good deformation compatibility with a concrete base material, good crack resistance and water resistance, has the effect of self-healing of micro cracks and can resist water and permeation for a long time when the bottom cavity is repaired.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
a reinforcing waterproof mortar for filling a concrete bottom cavity is composed of the following components in parts by weight: 80-100 parts of cement, 25-35 parts of graded sand, 20-30 parts of polymer emulsion, 5-7 parts of active substances, 8-10 parts of water glass, 5-8 parts of modified sodium bentonite, 1.0-1.5 parts of triethanolamine and 0.5-1.0 part of penetrating agent; the active substance is a self-polycondensation crystallization reactant and generates polycondensation crystals under the condition of water;
the preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, and then sequentially adding water glass, modified sodium bentonite and water, stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the water-based emulsion; wherein the mass ratio of the added water to the mortar solid material is 0.21-0.25: 1.
The invention adds the graded sand and the polymer emulsion on the basis of cement, and the distribution of the graded sand can improve the internal structure of the mortar, improve the compactness and be beneficial to the increase of the strength. The polymer emulsion is gradually gathered together along with the consumption and the escape of water, polymer particles are solidified to form a continuous polymer film structure, the outdoor durability and the base layer adaptability are better, larger gaps can be filled, and the waterproofness and the tensile strength of the mortar are further enhanced. Adding water glass and bentonite; the water glass is a metal silicate substance formed by combining alkali metal oxide and silicon dioxide, and can improve the compactness, acid resistance and water resistance of the mortar and improve the strength of the mortar. The bentonite is activated after being modified by adding alkali, the lattice structure of the bentonite is damaged, the surface water is lost, and the adsorption capacity and the binding capacity with a concrete structure of the modified bentonite are obviously improved. Under the condition of water, the modified bentonite can form a large amount of crystals which are not dissolved by water, so that gaps are compact, and the modified bentonite is firmly combined with a concrete structure.
The invention further adds active substance, penetrant and triethanolamine; in the process of producing the waterproof effect of the mortar, infiltration, crystallization or generation of new insoluble substances are inevitable. The active substance forms small molecules after being dissolved in water, then the small molecules are polymerized and grown under certain conditions, and finally water-insoluble crystals are generated to block cracks and capillary pores. The triethanolamine is used as a diffusant and can drive the active substances to diffuse to the periphery, and the penetrant is favorable for the active substances to permeate to the deep part of the concrete, so that the active substances can be distributed in the pores of the whole structure. The active substance absorbs water and expands in the structural pore gaps from sparse to dense, so that a dense anti-permeability area is gradually formed on the surface layer of the concrete structure towards depth, and the anti-permeability capability of the whole structure is greatly improved.
The reinforced waterproof slurry has certain viscosity and certain fluidity, so that the slurry can be diffused around a filling part, and simultaneously the slurry is diffused into gaps to generate crystal filling gaps. The invention can be applied to the waterproof construction of concrete bottom cavity filling, and can also be applied to the leaking stoppage construction of structural cracking, water seepage points and holes, and the waterproof and leaking stoppage construction of subway stations, underground continuous walls, tunnels, culverts and reservoir dams.
In the invention, preferably, the water glass is one or a mixture of more of lithium silicate water glass, potassium silicate water glass and sodium silicate water glass; the modulus of the lithium silicate water glass is 2.8-3.0, and the concentration is 40%; the modulus of the potassium silicate water glass is 3.0-3.2, and the concentration is 38%; the modulus of the sodium silicate water glass is 3.0-3.2, and the concentration is 40%. The modulus of water glass is an important parameter of water glass and is generally between 1.5 and 3.5. The larger the modulus of the water glass is, the more the silicon oxide content is, the viscosity of the water glass is increased, the water glass is easy to decompose and harden, and the binding power is increased.
In the invention, preferably, the distribution of the graded sand is 15-18% of coarse sand; 64-70% of medium sand; 15-18% of fine sand. Coarse sand is sand with a content of gravel particles of not more than 25% and a content of particles with a particle size of more than 0.5 mm of more than 50% of the total mass. Medium sand, sand with the particle size of more than 0.25mm and the mass of the particles exceeding 50 percent of the total mass. Fine aggregate with fineness modulus of 3.0-2.3. The sand consisting of particles with a diameter between 0.1 and 0.25mm is fine sand. The grading is the sand matching condition of large, medium and small particles, and the sand matching of the large, medium and small particle contents is proper, so that the porosity and the total surface area are small, namely the grading of the particles is good; aiming at the characteristics of epoxy mortar, the invention adjusts the distribution of graded sand, can improve the internal structure of mortar, improves the compactness and is beneficial to the increase of strength.
In the invention, preferably, the penetrating agent is one or a mixture of more than two of sodium di-sec-octyl maleate sulfonate, JFC-E, OE-35 and aminoethylpiperazine.
In the present invention, preferably, the reinforced waterproof mortar is composed of the following components in parts by weight: 95 parts of cement, 30 parts of graded sand, 25 parts of polymer emulsion, 6 parts of active substances, 9 parts of water glass, 6 parts of modified sodium bentonite, 1.0 part of triethanolamine and 0.8 part of penetrating agent. The mass ratio can ensure that all components in the mortar are uniformly dispersed, and the effects of compactness and impermeability are achieved.
In the present invention, preferably, the self-polycondensation crystallization reactant is Ca (OROH)2And/or NaOROH. The molecular structure is NaOROH and Ca (OROH)2The active substance of (2) has a small molecular weight, and contains a hydrophobic group-R-and a hydrophilic group-OH in the molecular structure. In the powdery and dry state, the hydrophilicity is greater than the hydrophobicity, and the water-soluble polyurethane is soluble in water; no condensation crystallization occurs in dry environment, and condensation crystallization occurs in wet environment to form water insoluble crystal- (OR)2n-。
In the present invention, preferably, the cement is P.O 42.5.5-grade ordinary portland cement, p.i 42.5-grade portland cement, or p.ii 42.5-grade portland cement.
In the invention, preferably, the high molecular polymer is redispersible latex powder, preferably ethylene-vinyl acetate copolymer, the solid content of the polymer is 93-98%, the pH value is 7-8, and the lowest film forming temperature is 0-5 ℃. The ethylene-vinyl acetate copolymer has the characteristics that the ethylene-vinyl acetate copolymer can easily form a film in mortar, and the performance of the mortar is improved.
In the invention, preferably, the reinforced waterproof mortar further comprises anti-crack fibers, and the addition amount of the anti-crack fibers is 0.5wt% to 1.5wt% of the mortar solid material. The crack-resistant fiber is added, so that the cracking phenomenon of the mortar is further improved, and the seepage-proofing effect is better.
The invention also provides a construction method for filling the cavity at the bottom of the concrete by using the reinforced waterproof mortar, which comprises the following steps:
s1, cleaning a bottom cavity structure, uniformly paving a layer of reinforced waterproof mortar in the cavity, wherein the paving amount of the reinforced waterproof mortar is 1.5-2.0 kg/m2；
S2.30 minutes later, pouring concrete; after the cast concrete is initially set, the reinforcing waterproof mortar is laid on the surface of the concrete, wherein the laying amount is 1.5-2.0 kg/m2；
And S3, compacting the concrete before final setting.
Compared with the prior art, the invention has the following beneficial effects:
1. the reinforced waterproof slurry has certain viscosity and certain fluidity, so that the slurry can be diffused around a filling part, and simultaneously the slurry is diffused into gaps to generate crystal filling gaps. The method can be applied to waterproof construction of concrete bottom cavity filling, and can also be applied to leakage stoppage construction of structural cracking, water seepage points and holes, and waterproof and leakage stoppage construction of subway stations, underground continuous walls, tunnels, culverts and reservoir dams.
2. The invention adds the graded sand and the polymer emulsion on the basis of the cement, and the distribution of the graded sand can improve the internal structure of the mortar, improve the compactness and be beneficial to the increase of the strength. The polymer emulsion is cured to form a continuous polymer membrane structure, so that larger gaps can be filled, and the waterproofness and tensile strength of the mortar are further enhanced.
3. The invention adds water glass and modified sodium bentonite; the sodium silicate promotes the density and strength of the mortar to be improved, and can improve the compactness, acid resistance and water resistance of the mortar and improve the strength of the mortar. The modified sodium bentonite can form a large amount of crystals which are not dissolved by water under the condition of water, so that gaps are compact, and the modified sodium bentonite is firmly combined with a concrete structure.
4. The invention adds active substance, penetrant and triethanolamine; the active substance forms small molecules after being dissolved in water, then the small molecules are polymerized and grown under certain conditions, and finally crystals which are not dissolved in water are generated to block cracks and capillary holes. The triethanolamine is used as a diffusant which can drive the active substances to diffuse to the periphery, and the penetrant is favorable for the active substances to permeate to the deep part of the concrete, so that the active substances are distributed in the pores of the whole structure. The active substance absorbs water and expands in the structural pore seams from sparse to dense, so that a compact anti-permeability area is gradually formed on the surface layer of the concrete structure towards depth, and the anti-permeability capability of the whole structure is greatly improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to specific examples and performance tests, but the scope of the present invention is not limited to the examples.
The starting materials used in the following examples are all commercially available unless otherwise specified.
Wherein the cement used in the following examples is P.O 42.5.5 grade Portland cement; the polymer emulsion is an ethylene-vinyl acetate copolymer, the solid content of the polymer emulsion is 96 percent, the pH value is 7.5, and the lowest film forming temperature is 3 ℃.
Example 1:
the embodiment provides a reinforcing waterproof mortar for filling a concrete bottom cavity, which consists of the following components in parts by weight: 80kg of cement, 25kg of graded sand, 20kg of polymer emulsion, 5kg of active substances, 8kg of lithium silicate waterglass, 5kg of modified sodium bentonite, 1.0kg of triethanolamine and 0.5kg of penetrant di-sec-octyl maleate sodium sulfonate; the active substance is Ca (OROH)2(ii) a The modulus of the lithium silicate waterglass is 3.0, and the concentration is 40%. The distribution of the graded sand is 15 percent of coarse sand; 70% of medium sand; 15 percent of fine sand.
The preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, and then sequentially adding water glass, modified sodium bentonite and water, stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the composite material; wherein the mass ratio of the added water to the mortar solid is 0.21: 1.
Example 2:
the embodiment provides a reinforcing waterproof mortar for filling a concrete bottom cavity, which consists of the following components in parts by weight: 100kg of cement, 35kg of graded sand, 30kg of polymer emulsion, 7kg of active substances, 10kg of potassium silicate water glass, 8kg of modified sodium bentonite, 1.5kg of triethanolamine and 1.0kg of penetrating agent JFC-E; the active substance is NaOROH; the modulus of the potassium silicate waterglass is 3.2, and the concentration is 38%; the distribution of the graded sand is 18 percent of coarse sand; medium sand 64 percent; 18 percent of fine sand.
The preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, and then sequentially adding water glass, modified sodium bentonite and water, stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the composite material; wherein the mass ratio of the added water to the mortar solid is 0.25: 1.
Example 3:
the embodiment provides a reinforcing waterproof mortar for filling a concrete bottom cavity, which consists of the following components in parts by weight: 95kg of cement, 30kg of graded sand, 25kg of polymer emulsion, 6kg of active substances, 9kg of sodium silicate water glass, 6kg of modified sodium bentonite, 1.0kg of triethanolamine and 350.8kg of penetrant OE; the active substance is 3kg Ca (OROH)2And 3kg NaOROH; the modulus of the sodium silicate water glass is 3.2, and the concentration is 40%; the distribution of the graded sand is 16 percent of coarse sand; medium sand 67%; 17 percent of fine sand.
The preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, then sequentially adding water glass, modified sodium bentonite and water, and stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the composite material; wherein the mass ratio of the added water to the mortar solid is 0.22: 1.
Example 4:
the embodiment provides a reinforcing waterproof mortar for filling a concrete bottom cavity, which consists of the following components in parts by weight: 85kg of cement, 30kg of graded sand, 22kg of polymer emulsion, 5kg of active substances, 8kg of water glass (lithium silicate water glass and potassium silicate water glass are mixed according to the mass ratio of 1: 1), 7kg of modified sodium bentonite, 1.2kg of triethanolamine, 0.7kg of penetrant aminoethylpiperazine and 5kg of anti-cracking fibers. The active substance is Ca (OROH)2(ii) a The modulus of the lithium silicate water glass is 2.8, and the concentration is 40%; the modulus of the potassium silicate waterglass is 3.0, and the concentration is 38%. The distribution of the graded sand is 17 percent of coarse sand; medium sand 67%; 16 percent of fine sand.
The preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, and then sequentially adding water glass, modified sodium bentonite and water, stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the composite material; wherein the mass ratio of the added water to the mortar solid is 0.23: 1.
Example 5:
the embodiment provides a reinforcing waterproof mortar for filling a concrete bottom cavity, which consists of the following components in parts by weight: 95kg of cement, 30kg of graded sand, 25kg of polymer emulsion, 6kg of active substances, 9kg of water glass (sodium silicate water glass and potassium silicate water glass are mixed according to the mass ratio of 1: 1), 6kg of modified sodium bentonite, 1.0kg of triethanolamine, 0.8kg of penetrating agent JFC-E0.8kg and 4kg of anti-crack fibers. The active substance is NaOROH; the modulus of the potassium silicate waterglass is 3.2, and the concentration is 38%; the modulus of the sodium silicate waterglass is 3.2, the concentration is 40%. The distribution of the graded sand is 18 percent of coarse sand; medium sand 65%; 17 percent of fine sand.
The preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, and then sequentially adding water glass, modified sodium bentonite and water, stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the composite material; wherein the mass ratio of the added water to the mortar solid is 0.24: 1.
Comparative examples 1 to 4:
compared with example 1, comparative example 1 does not add modified sodium bentonite, comparative example 2 does not add a penetrant, comparative example 3 does not add an active substance, and comparative example 4 does not add a polymer emulsion; other operations of comparative examples 1 to 4 were the same as in example 1.
Performance test
The reinforced waterproof mortar obtained in examples 1 to 5 and comparative examples 1 to 4 was used for repairing cracked concrete, and included the following steps:
1) cleaning the release agent, the slurry coating impurities and the loosened gravels on the surface of the structural concrete by using a steel brush, and blowing away floating dust by using an air blower to ensure that the surface of the concrete is clean; the base layer with a smooth surface is subjected to roughening treatment on the surface of the base layer;
2) fully wetting the concrete surface with water to keep the base surface moist but not have open water;
3) coating the reinforced waterproof mortar obtained in the examples 1-5 and the comparative examples 1-4, wherein the thickness of the coating is ensured to be uniform during coating, the coating thickness is 0.9mm-1.5mm, the coating is coated for two to four times according to the consistency of the slurry, and the total consumption is not less than 1.5 kg/square meter;
4) when the surface of the maintenance coating is dry and white, immediately watering and maintaining for 7 days, and adopting spray type watering and maintaining to avoid water flow from damaging the coating and keep the surface of the coating wet during the maintenance period;
5) and the water is sprayed for no more than 1 hour in a high-temperature strong wind period, generally the water is sprayed for no less than 10 times every day, and the surface of the coating is prevented from being subjected to rain, frost, sun exposure, wind blowing and low-temperature freezing damage below 0 ℃ in a maintenance period.
The reinforced waterproof mortar is preferably used up within 30 minutes, and water cannot be added randomly in the using process.
After the coating is cured (the curing time is respectively 7d, 28d and 56d), various performance tests are carried out according to the national standard GB18445-2012 and the national performance standard is contrasted. The test results are shown in table 1.
TABLE 1
As can be seen from the above table, the reinforced waterproof mortar has significant advantages in the aspects of compressive strength, flexural strength, wet base surface bonding strength, permeation pressure ratio, permeation pressure resistance, secondary permeation pressure resistance and the like, and far exceeds the use standard indexes; among them, example 3 is the most preferable scheme. In addition, comparative examples 1-4 compare to example 1, comparative example 1 does not add modified sodium bentonite, comparative example 2 does not add a penetrant, comparative example 3 does not add an active substance, comparative example 4 does not add a polymer emulsion; the mechanical property and the anti-seepage property of the obtained mortar are reduced.
Variations and modifications to the above-described embodiments may occur to those skilled in the art based upon the disclosure and teachings of the above specification. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
1. The reinforcing waterproof mortar for filling the cavity at the bottom of the concrete is characterized by comprising the following components in parts by weight: 80-100 parts of cement, 25-35 parts of graded sand, 20-30 parts of polymer emulsion, 5-7 parts of active substances, 8-10 parts of water glass, 5-8 parts of modified sodium bentonite, 1.0-1.5 parts of triethanolamine and 0.5-1.0 part of penetrating agent; the active substance is a self-polycondensation crystallization reactant and generates polycondensation crystals under the condition of water;
the preparation of the modified sodium bentonite comprises the following steps: crushing and homogenizing bentonite raw ore, and screening to obtain bentonite with 50-100 meshes; uniformly mixing 50-100 meshes of bentonite with a sodium agent and a modification auxiliary agent, adding water, stirring to obtain a mixture, stacking, aging and drying the mixture to obtain modified sodium bentonite;
the reinforced waterproof mortar is prepared on site, and the concrete preparation steps are as follows: mixing cement, graded sand and polymer emulsion, uniformly stirring, and then sequentially adding water glass, modified sodium bentonite and water, stirring and mixing to form slurry; finally adding triethanolamine, a penetrating agent and an active substance, and uniformly mixing to obtain the composite material; wherein the mass ratio of the added water to the mortar solid material is 0.21-0.25: 1; the distribution of the graded sand is 15-18% of coarse sand; 64-70% of medium sand; 15-18% of fine sand; the polymer emulsion is redispersible emulsion powder, the solid content of the polymer emulsion is 93-98%, the pH value is 7-8, and the lowest film forming temperature is 0-5 ℃;
the water glass is one or a mixture of more of lithium silicate water glass, potassium silicate water glass and sodium silicate water glass; the modulus of the lithium silicate water glass is 2.8-3.0, and the concentration is 40%; the modulus of the potassium silicate water glass is 3.0-3.2, and the concentration is 38%; the modulus of the sodium silicate water glass is 3.0-3.2, and the concentration is 40%; the self-polycondensation crystallization reactant is Ca (OROH)2And/or NaOROH;
the reinforced waterproof mortar also comprises anti-crack fibers, and the addition amount of the anti-crack fibers is 0.5-1.5 wt% of the mortar solid material.
2. The reinforced waterproof mortar for filling concrete bottom cavities according to claim 1, characterized in that the penetrating agent is one or a mixture of two or more of sodium di-sec-octyl maleate sulfonate, JFC-E, OE-35, and aminoethylpiperazine.
3. The reinforcing waterproof mortar for filling the concrete bottom cavity according to claim 1, which is characterized by comprising the following components in parts by weight: 95 parts of cement, 30 parts of graded sand, 25 parts of polymer emulsion, 6 parts of active substances, 9 parts of water glass, 6 parts of modified sodium bentonite, 1.0 part of triethanolamine and 0.8 part of penetrating agent.
4. The reinforcing and waterproofing mortar for filling concrete bottom cavities according to claim 1, wherein said cement is P.O 42.5.5-grade ordinary portland cement, p.i 42.5-grade portland cement, or p.ii 42.5-grade portland cement.
5. The construction method of the reinforced waterproof mortar for concrete bottom cavity filling according to any one of claims 1 to 4, characterized by comprising the following steps:
s1, cleaning a bottom cavity structure, uniformly paving a layer of reinforced waterproof mortar in the cavity, wherein the paving amount of the reinforced waterproof mortar is 1.5-2.0 kg/m2；
S2.30 minutes later, pouring concrete; after the cast concrete is initially set, the reinforcing waterproof mortar is laid on the surface of the concrete, wherein the laying amount is 1.5-2.0 kg/m2；
And S3, compacting the concrete before final setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110080602.2A CN112679190B (en) | 2021-01-21 | 2021-01-21 | Reinforcing waterproof mortar for filling concrete bottom cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110080602.2A CN112679190B (en) | 2021-01-21 | 2021-01-21 | Reinforcing waterproof mortar for filling concrete bottom cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112679190A CN112679190A (en) | 2021-04-20 |
| CN112679190B true CN112679190B (en) | 2022-07-05 |
Family
ID=75458769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110080602.2A Active CN112679190B (en) | 2021-01-21 | 2021-01-21 | Reinforcing waterproof mortar for filling concrete bottom cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112679190B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855705A (en) * | 2021-06-21 | 2022-08-05 | 韩元元 | Method for treating leakage of water engineering |
| CN114164039B (en) * | 2021-11-23 | 2023-06-27 | 科之杰新材料集团有限公司 | Environment-friendly concrete release agent and preparation method thereof |
| CN114605169B (en) * | 2022-03-30 | 2023-03-21 | 长安大学 | Silicon-based reinforcer for reinforcing stone and preparation method thereof |
| CN115925380A (en) * | 2022-10-27 | 2023-04-07 | 湖南沿湖建设工程有限公司 | Phosphogypsum composite sandy soil impermeable material with crack self-healing property and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503346A (en) * | 2011-11-08 | 2012-06-20 | 姜哲 | Cement-based penetrable crystallized waterproof paint, preparation method and construction method thereof |
| KR20140132164A (en) * | 2013-05-07 | 2014-11-17 | 주식회사 화승티엔씨 | Mortar composition comprising high efficient photocatalyst and preparing method thereof |
| CN105218152A (en) * | 2015-09-16 | 2016-01-06 | 桂林市和鑫防水装饰材料有限公司 | A kind of infiltration crystallization type concrete water-resisting agent |
| CN107522450A (en) * | 2017-09-04 | 2017-12-29 | 东南大学 | A kind of impervious waterproof mortar of high flexibility |
| CN108409253A (en) * | 2018-05-17 | 2018-08-17 | 肥西县碧涛建材有限公司 | A kind of mortar and preparation method thereof shortening setting time |
| CN109336497A (en) * | 2018-10-18 | 2019-02-15 | 中国铁道科学研究院集团有限公司金属及化学研究所 | A kind of polymer cement mortar and a kind of repair type railway concrete bridge floor waterproof construction |
| CN110357545A (en) * | 2019-08-16 | 2019-10-22 | 广西理工职业技术学院 | Concrete base layer local damage rapid-patching motar and preparation method thereof |
-
2021
- 2021-01-21 CN CN202110080602.2A patent/CN112679190B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503346A (en) * | 2011-11-08 | 2012-06-20 | 姜哲 | Cement-based penetrable crystallized waterproof paint, preparation method and construction method thereof |
| KR20140132164A (en) * | 2013-05-07 | 2014-11-17 | 주식회사 화승티엔씨 | Mortar composition comprising high efficient photocatalyst and preparing method thereof |
| CN105218152A (en) * | 2015-09-16 | 2016-01-06 | 桂林市和鑫防水装饰材料有限公司 | A kind of infiltration crystallization type concrete water-resisting agent |
| CN107522450A (en) * | 2017-09-04 | 2017-12-29 | 东南大学 | A kind of impervious waterproof mortar of high flexibility |
| CN108409253A (en) * | 2018-05-17 | 2018-08-17 | 肥西县碧涛建材有限公司 | A kind of mortar and preparation method thereof shortening setting time |
| CN109336497A (en) * | 2018-10-18 | 2019-02-15 | 中国铁道科学研究院集团有限公司金属及化学研究所 | A kind of polymer cement mortar and a kind of repair type railway concrete bridge floor waterproof construction |
| CN110357545A (en) * | 2019-08-16 | 2019-10-22 | 广西理工职业技术学院 | Concrete base layer local damage rapid-patching motar and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112679190A (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112679190B (en) | Reinforcing waterproof mortar for filling concrete bottom cavity | |
| CN110256023B (en) | Anti-freezing, anti-permeability and anti-cracking concrete and preparation method thereof | |
| CN100475733C (en) | Adhesive, heat insulating and sound isolating material with the adhesive and preparing process thereof | |
| CN101269935B (en) | Conduit pipe joint sealing perfusion mortar and manufacturing method thereof | |
| CN112341123B (en) | Seawater corrosion resistant ceramic tile adhesive and production method thereof | |
| CN103979901B (en) | A kind of cement based shrinking-free grouting material and using method being mixed with phosphorus slag powder | |
| CN112047679B (en) | Recycled concrete and preparation method thereof | |
| CN108328977B (en) | Concrete repairing material | |
| CN109354463A (en) | Impervious freeze proof C30 concrete of one kind and preparation method thereof | |
| CN113816643B (en) | Concrete reinforcing agent for sponge city construction, preparation method thereof and pervious concrete | |
| CN107337408A (en) | A kind of wear-resisting antiseepage composite mortar of cracking resistance and preparation method thereof | |
| CN114956681A (en) | High-temperature cured low-carbon high-strength geopolymer concrete material and preparation method thereof | |
| CN108793935B (en) | Precast dry material sprayed concrete | |
| CN112408880A (en) | Basalt fiber water-permeable concrete and preparation method thereof | |
| CN110092623A (en) | A kind of dredging and reclamation silt curing agent | |
| CN111253127A (en) | C30 carbon fiber broken brick recycled concrete and preparation method thereof | |
| CN111196704B (en) | Concrete for prefabricated part and preparation method thereof | |
| CN107892531A (en) | The production method of tunnel cement mortar | |
| CN111362636A (en) | C60 carbon fiber concrete and preparation method thereof | |
| CN110317006A (en) | A kind of architecture construction concrete and preparation method thereof | |
| CN115259802A (en) | Seawater sea sand concrete with chloride ion curing capability and toughness | |
| CN107572954B (en) | Red clay curing agent and use method thereof | |
| CN111848068A (en) | Rapid repair mortar for horizontal surface defects and preparation method thereof | |
| CN112321226A (en) | Plant-growing concrete material prepared by wet grinding of potassium feldspar and phosphate tailings and preparation method thereof | |
| CN1356281A (en) | Low-heat silicate cement and its preparing process and application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |