CN116161932B - Wet-mixed mortar and preparation method thereof - Google Patents
Wet-mixed mortar and preparation method thereof Download PDFInfo
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- CN116161932B CN116161932B CN202310456395.5A CN202310456395A CN116161932B CN 116161932 B CN116161932 B CN 116161932B CN 202310456395 A CN202310456395 A CN 202310456395A CN 116161932 B CN116161932 B CN 116161932B
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- 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
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- 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
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Abstract
The invention provides wet-mixed mortar and a preparation method thereof, and belongs to the field of wet-mixed mortar. The preparation method of the wet-mixed mortar comprises the following steps: modifying polypropylene fiber, preparing modified sodium alginate microspheres and mixing; the polypropylene fiber is modified and consists of the following steps: primary fiber treatment, secondary fiber treatment, and surface treatment. The preparation method of the wet-mixed mortar can prolong the opening time of the wet-mixed mortar, reduce the volume weight of the wet-mixed mortar, improve the bleeding performance and improve the compressive strength and the flexural strength of the wet-mixed mortar; and the stability of the wet-mixed mortar in the transportation and storage processes or in the high-temperature environment is improved, and the subsequent application performance of the wet-mixed mortar is ensured to be stable.
Description
Technical Field
The invention relates to the field of wet-mixed mortar, in particular to wet-mixed mortar and a preparation method thereof.
Background
The wet-mixed mortar is a wet-mixed mortar mixture which is prepared from raw material components such as cement, admixture, fine aggregate, additive, water and the like by metering, mixing and stirring in a stirring station according to a certain proportion, transporting to a using place by adopting a stirring transport vehicle, discharging to a special container for the wet-mixed mortar, and storing the wet-mixed mortar mixture after the wet-mixed mortar mixture is used in a specified time. Compared with dry-mixed mortar, the wet-mixed mortar has the advantages of low production cost, uniform and stable quality, less secondary dust, capability of avoiding secondary stirring, capability of avoiding noise and dust pollution caused by on-site stirring, and the like.
Years of practice prove that the wet-mixed mortar is a novel green building material, and can be conveniently used in engineering construction after being prepared in advance in a professional mortar production factory. The wet mixed mortar plays a remarkable role in saving resources, protecting environment, improving engineering quality and the like, and is a product for further assisting energy conservation and emission reduction after the concrete is ready mixed. In order to meet the requirements of the existing construction site for taking out and working, namely, no need of hardening, the wet-mixed mortar needs a certain opening time (generally 24 hours). The wet-mixed mortar needs to meet the quality requirements of the whole process of centralized production, centralized distribution and site on-site use of a mixing plant in the opening time. Therefore, when the amount of engineering tasks becomes large, the wet-mixed mortar is prefabricated in advance according to engineering requirements and is centralized and distributed to a construction site, and the advantages of the wet-mixed mortar are brought into full play.
In order to prolong the opening time of the wet-mixed mortar, the prior art generally adopts a mode of adding additives such as retarder, air entraining agent and the like, and the addition of the external additives such as retarder, air entraining agent and the like can prolong the opening time of the wet-mixed mortar, reduce the volume weight of the wet-mixed mortar and improve the bleeding performance of the wet-mixed mortar to a certain extent. However, the addition of external additives such as retarder, air entraining agent and the like can lead to the attenuation of the compressive strength and the flexural strength of the wet-mixed mortar; in addition, the dispersibility of various additives and components (such as fibers, metal powder and the like) for improving the physical properties of the wet-mixed mortar in the wet-mixed mortar is not ideal, and the stability is difficult to maintain in a stable state in the middle or high-temperature environment of the transportation and storage processes, so that the subsequent application performance of the wet-mixed mortar is unstable, and the construction progress can be influenced when the subsequent application performance of the wet-mixed mortar is serious.
Therefore, the wet-mixed mortar and the preparation method thereof are provided, and the compressive strength and the flexural strength of the wet-mixed mortar can be improved while the opening time of the wet-mixed mortar is prolonged, the volume weight of the wet-mixed mortar is reduced, and the bleeding performance is improved; and the stability of the wet-mixed mortar in the transportation and storage processes or in the high-temperature environment is improved, and the method has important significance for ensuring the stability of the subsequent application performance of the wet-mixed mortar.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the wet-mixed mortar and the preparation method thereof, which can prolong the opening time of the wet-mixed mortar, reduce the volume weight of the wet-mixed mortar, improve the bleeding performance and improve the compressive strength and the flexural strength of the wet-mixed mortar; and the stability of the wet-mixed mortar in the transportation and storage processes or in the high-temperature environment is improved, and the subsequent application performance of the wet-mixed mortar is ensured to be stable.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of wet-mixed mortar comprises the following steps: modifying polypropylene fiber, preparing modified sodium alginate microspheres, and mixing.
The polypropylene fiber is modified and consists of the following steps: primary fiber treatment, secondary fiber treatment, and surface treatment.
The primary fiber treatment is carried out, namely, polypropylene fibers are put into ethanol solution with the volume of 8-10 times, stirred for 2-3 hours, filtered out and put into deionized water with the volume of 8-10 times, dispersed by ultrasound for 30-60 minutes, stirred for 1-2 hours, filtered out and put into sulfuric acid solution with the volume of 3-5 times, heated to 45-55 ℃ at the heating rate of 0.2-0.4 ℃/min, and immersed for 1-2 hours after heat preservation; filtering, sequentially washing with 3-5 times of absolute ethyl alcohol and 3-5 times of deionized water, and drying at 55-65deg.C for 7-9 hr to obtain primary treated product.
In the primary fiber treatment, the length of the polypropylene fiber is 25-40mm, and the diameter is 80-120 mu m;
the volume concentration of the ethanol solution is 40-50%;
the concentration of the sulfuric acid solution is 30-35wt%.
And (3) carrying out secondary fiber treatment, namely adding the primary treatment object into the first treatment liquid with the volume being 3-5 times that of the primary treatment liquid, heating to 90-95 ℃, carrying out heat preservation and stirring for 60-90min, filtering out, adding the primary treatment object into the second treatment liquid with the volume being 3-5 times that of the primary treatment liquid, heating to 85-90 ℃, carrying out heat preservation and stirring for 60-90min, filtering out, adding the secondary treatment object into the third treatment liquid with the volume being 3-5 times that of the primary treatment liquid, heating to 80-85 ℃, carrying out heat preservation and stirring for 60-90min, filtering out, washing for 2-3 times by adopting the deionized water with the volume being 8-10 times that of the primary treatment object, and placing the secondary treatment object into a constant-temperature drying oven, and drying for 7-9h at the temperature of 45-55 ℃ to obtain the secondary treatment object.
In the secondary fiber treatment, the first treatment liquid is hydrogen peroxide solution with the concentration of 2-3 wt%;
the second treatment solution is hydrogen peroxide solution with the concentration of 5-6wt%;
the third treatment solution is hydrogen peroxide solution with the concentration of 12-13 wt%.
The surface treatment is carried out, the surface treatment liquid is uniformly sprayed on the outer surface of the secondary treatment object, the spraying speed is controlled to be 8-10g/min, the dosage of the surface treatment liquid for each 100g of the secondary treatment object is 3-4g, after the spraying is finished, the temperature is raised to 40-50 ℃, and the heat preservation and standing are carried out for 20-30h; and then transferring into a constant temperature drying oven, and drying at 50-60 ℃ to constant weight to obtain the modified polypropylene fiber.
The preparation method of the surface treatment liquid comprises the steps of putting nano silicon dioxide and sodium dodecyl sulfate into deionized water, uniformly dispersing, and stirring for 20-40min; adjusting pH to 5-5.5 with hydrochloric acid, continuously adding nano kaolin, nano titanium dioxide and silane coupling agent KH-570, heating to 50-60 ℃, keeping the temperature, refluxing and stirring for 3-4 hours, and obtaining the surface treatment liquid.
In the surface treatment liquid, the weight ratio of nano silicon dioxide to sodium dodecyl sulfate to nano kaolin to nano titanium dioxide to silane coupling agent KH-570 to deionized water is 10-12:0.8-1:6-8:3-4:2-3:100-110;
the concentration of hydrochloric acid is 1-2mol/L.
The sodium alginate microspheres are prepared, sodium alginate is put into deionized water, the temperature is raised to 50-60 ℃, and the sodium alginate microspheres are stirred at the temperature of 50-60 ℃ until the sodium alginate microspheres are completely dissolved, so that sodium alginate solution with the concentration of 1.2-1.5wt% is prepared; dropwise adding the sodium alginate solution into the calcium chloride solution with the volume of 3-5 times at the dropwise adding rate of 2-3mL/min under the stirring condition, continuously stirring for 4-6h after the dropwise adding is finished, and standing for 48-72h under the normal temperature environment; and then filtering out sodium alginate microspheres, washing for 2-3 times by adopting 8-10 times of deionized water, adding into 4-6 times of modified liquid, stirring for 30-40h, filtering out and placing into a constant temperature drying oven, and drying for 5-6h at 80-90 ℃ to obtain the modified sodium alginate microspheres.
In the preparation of the modified sodium alginate microspheres, the concentration of the calcium chloride solution is 0.1-0.12mol/L;
the modifying liquid is deionized water solution dissolved with sodium citrate; the weight ratio of sodium citrate to deionized water in the modified liquid is 25-30:100.
Mixing sand, P.O 42.5.5 cement, fly ash, crushed stone powder, limestone powder, modified polypropylene fibers, modified sodium alginate microspheres, a polycarboxylate water reducer, sodium abietate and water uniformly to prepare the wet-mixed mortar.
In the mixing process, the weight ratio of sand to P.O 42.5.5 cement to fly ash to crushed stone to limestone to modified polypropylene to modified sodium alginate microspheres to polycarboxylate water reducer to sodium abietate to water is 1000-1100:280-300:110-120:150-160:60-70:7-9:8-10:1-1.2:1.5-1.8:120-130.
The preparation method of the wet-mixed mortar is adopted.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the preparation method of the wet-mixed mortar, after primary fiber treatment is carried out on polypropylene fiber by adopting sulfuric acid, secondary fiber treatment is carried out by adopting hydrogen peroxide solutions with different concentrations, then surface spraying treatment is carried out by adopting surface treatment liquid with specific composition, and the prepared modified polypropylene fiber is used in the mixing step of the wet-mixed mortar; meanwhile, modifying the sodium alginate microspheres by adopting a specific modifying liquid, and using the prepared modified sodium alginate microspheres in a mixing step of wet-mixed mortar; the specific raw material components in the mixing step are matched, so that the influence of the additive on the physical properties such as the compressive strength, the flexural strength and the like of the wet-mixed mortar can be effectively reduced, the opening time of the wet-mixed mortar can be prolonged, the volume weight of the wet-mixed mortar can be reduced, the bleeding performance can be improved, and meanwhile, the compressive strength and the flexural strength of the wet-mixed mortar can be improved; and the stability of the wet-mixed mortar in the transportation and storage processes or in the high-temperature environment is improved, and the subsequent application performance of the wet-mixed mortar is ensured.
(2) The wet-mixed mortar has an opening time of 25.2-26.3h and a volume weight of 1.83-1.86kg/m 3 The water retention rate is 94.0-94.7%, and the consistency is 85-87mm; the cured molding body of the wet-mixed mortar has the flexural strength of 12.6-13.0MPa, the 7d compressive strength of 25.0-25.8MPa, the 28d compressive strength of 46.7-47.9MPa and the 28d shrinkage of 0.084-0.091 percent. The additive can effectively reduce the influence of the additive on the physical properties such as the compressive strength, the flexural strength and the like of the wet-mixed mortar, and can prolong the opening time of the wet-mixed mortar, reduce the volume weight of the wet-mixed mortar, improve the bleeding performance and simultaneously improve the physical properties such as the compressive strength, the flexural strength and the like of the wet-mixed mortar.
(3) The wet-mixed mortar of the invention is kept stand and stored for 24 hours at normal temperature in a closed container, and no bleeding chromatography phenomenon exists; after standing and storing for 24 hours at the temperature of 45 ℃, no bleeding chromatography phenomenon exists, and the stability of the wet mixed mortar in the transportation and storage processes or in the high-temperature environment is effectively improved.
(4) The wet-mixed mortar provided by the invention has the consistency of 79-82mm, the flexural strength of 11.9-12.6MPa, the 7d compressive strength of 24.6-25.4MPa, the 28d compressive strength of 45.5-46.8MPa and the 28d shrinkage rate of 0.088-0.099% after being kept stand and stored for 24 hours at the temperature of 45 ℃, so that the stability of the wet-mixed mortar in a high-temperature environment is effectively improved, and the subsequent application performance of the wet-mixed mortar is ensured.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention.
Example 1
A preparation method of wet-mixed mortar specifically comprises the following steps:
1. polypropylene fiber modification
1) Primary fiber treatment
Adding polypropylene fibers into ethanol solution with the volume being 8 times that of the polypropylene fibers, stirring for 2 hours, filtering out and adding the polypropylene fibers into deionized water with the volume being 8 times that of the polypropylene fibers, performing ultrasonic dispersion for 30 minutes, stirring for 1 hour, filtering out and adding the polypropylene fibers into sulfuric acid solution with the volume being 3 times that of the polypropylene fibers, heating to 45 ℃ at a heating rate of 0.2 ℃/min, and preserving heat and immersing for 1 hour; filtering, washing with 3 times of absolute ethyl alcohol and 3 times of deionized water, and drying at 55deg.C for 7 hr.
Wherein the polypropylene fiber has a length of 25mm and a diameter of 80 μm.
The volume concentration of the ethanol solution was 40%.
The concentration of the sulfuric acid solution was 30wt%.
2) Secondary fiber treatment
And (3) adding the primary treatment object into the first treatment liquid with the volume being 3 times, heating to 90 ℃, preserving heat and stirring for 60min, filtering out and adding the primary treatment object into the second treatment liquid with the volume being 3 times, heating to 85 ℃, preserving heat and stirring for 60min, filtering out and adding the primary treatment object into the third treatment liquid with the volume being 3 times, heating to 80 ℃, preserving heat and stirring for 60min, filtering out and washing with the deionized water with the volume being 8 times for 2 times, placing the primary treatment object into a constant temperature drying oven, and drying at 45 ℃ for 7h to obtain the secondary treatment object.
Wherein the first treatment liquid is a hydrogen peroxide solution with the concentration of 2wt%.
The second treatment solution is a hydrogen peroxide solution with the concentration of 5 weight percent.
The third treatment solution is hydrogen peroxide solution with the concentration of 12 weight percent.
3) Surface treatment
Uniformly spraying the surface treatment liquid on the outer surface of the secondary treatment object, controlling the spraying speed to be 8g/min, controlling the dosage of the surface treatment liquid for each 100g of the secondary treatment object to be 3g, heating to 40 ℃ after the spraying is finished, and preserving heat and standing for 20h; and then transferring the polypropylene fibers into a constant temperature drying oven, and drying the polypropylene fibers at 50 ℃ to constant weight to obtain the modified polypropylene fibers.
The preparation method of the surface treatment liquid comprises the steps of putting nano silicon dioxide and sodium dodecyl sulfate into deionized water, uniformly dispersing, and stirring for 20min; adjusting the pH to 5 by adopting hydrochloric acid, continuously adding nano kaolin, nano titanium dioxide and a silane coupling agent KH-570, heating to 50 ℃, preserving heat, refluxing and stirring for 3 hours, and thus obtaining the surface treatment liquid.
In the surface treatment liquid, the weight ratio of nano silicon dioxide to sodium dodecyl sulfate to nano kaolin to nano titanium dioxide to silane coupling agent KH-570 to deionized water is 10:0.8:6:3:2:100.
The concentration of hydrochloric acid is 1mol/L.
2. Preparation of modified sodium alginate microspheres
Adding sodium alginate into deionized water, heating to 50 ℃, preserving heat, and stirring until the sodium alginate is completely dissolved to prepare sodium alginate solution with the concentration of 1.2 wt%; dropwise adding the sodium alginate solution into the calcium chloride solution with the volume being 3 times at the dropwise adding rate of 2mL/min under the stirring condition, continuously stirring for 4 hours after the dropwise adding is finished, and standing for 48 hours under the normal temperature environment; and filtering out sodium alginate microspheres, washing for 2 times by adopting 8 times of deionized water, adding into 4 times of modified liquid, stirring for 30 hours, filtering out and placing into a constant-temperature drying oven, and drying at 80 ℃ for 5 hours to obtain the modified sodium alginate microspheres.
Wherein the concentration of the calcium chloride solution is 0.1mol/L.
The modifying liquid is deionized water solution dissolved with sodium citrate; the weight ratio of sodium citrate to deionized water in the modified liquid is 25:100.
3. Mixing
Sand, P.O 42.5.5 cement, fly ash, crushed stone powder, limestone powder, modified polypropylene fibers, modified sodium alginate microspheres, a polycarboxylate water reducer, sodium abietate and water are uniformly mixed to prepare the wet-mixed mortar.
The weight ratio of sand to P.O 42.5.5 cement to fly ash to crushed stone powder to limestone powder to modified polypropylene fibers to modified sodium alginate microspheres to polycarboxylate water reducer to sodium abietate to water is 1000:280:110:150:60:7:8:1:1.5:120.
Example 2
A preparation method of wet-mixed mortar specifically comprises the following steps:
1. polypropylene fiber modification
1) Primary fiber treatment
Adding polypropylene fibers into ethanol solution with the volume being 9 times that of the polypropylene fibers, stirring for 2.5 hours, filtering out and adding the polypropylene fibers into deionized water with the volume being 9 times that of the polypropylene fibers, performing ultrasonic dispersion for 45 minutes, stirring for 1.5 hours, filtering out and adding the polypropylene fibers into sulfuric acid solution with the volume being 4 times that of the polypropylene fibers, heating to 50 ℃ at a heating rate of 0.3 ℃/min, and performing heat preservation and impregnation for 1.5 hours; filtering, washing with 4 times of absolute ethyl alcohol and 4 times of deionized water, and drying at 60deg.C for 8 hr to obtain primary treated product.
Wherein the length of the polypropylene fiber is 35mm and the diameter is 100 μm.
The volume concentration of the ethanol solution was 45%.
The concentration of the sulfuric acid solution was 32wt%.
2) Secondary fiber treatment
And (3) adding the primary treatment object into the first treatment liquid with the volume being 4 times, heating to 92 ℃, preserving heat and stirring for 80min, filtering out and adding the primary treatment object into the second treatment liquid with the volume being 4 times, heating to 88 ℃, preserving heat and stirring for 80min, filtering out and adding the primary treatment object into the third treatment liquid with the volume being 4 times, heating to 82 ℃, preserving heat and stirring for 80min, filtering out and washing with the deionized water with the volume being 9 times for 3 times, placing the primary treatment object into a constant temperature drying oven, and drying at 50 ℃ for 8h to obtain the secondary treatment object.
Wherein the first treatment liquid is hydrogen peroxide solution with the concentration of 2.5 weight percent.
The second treatment solution is hydrogen peroxide solution with the concentration of 5.5 weight percent.
The third treatment solution is hydrogen peroxide solution with the concentration of 12.5 weight percent.
3) Surface treatment
Uniformly spraying the surface treatment liquid on the outer surface of the secondary treatment object, controlling the spraying speed to be 9g/min, controlling the dosage of the surface treatment liquid for each 100g of the secondary treatment object to be 3.5g, heating to 45 ℃ after spraying is finished, and preserving heat and standing for 25h; and then transferring the polypropylene fibers into a constant temperature drying oven, and drying the polypropylene fibers at 55 ℃ to constant weight to obtain the modified polypropylene fibers.
The preparation method of the surface treatment liquid comprises the steps of putting nano silicon dioxide and sodium dodecyl sulfate into deionized water, uniformly dispersing, and stirring for 30min; adjusting the pH to 5.2 by adopting hydrochloric acid, continuously adding nano kaolin, nano titanium dioxide and a silane coupling agent KH-570, heating to 55 ℃, preserving heat, refluxing and stirring for 3.5 hours, and thus obtaining the surface treatment liquid.
In the surface treatment liquid, the weight ratio of nano silicon dioxide to sodium dodecyl sulfate to nano kaolin to nano titanium dioxide to silane coupling agent KH-570 to deionized water is 11:0.9:7:3.5:2.5:105.
The concentration of hydrochloric acid is 1.5mol/L.
2. Preparation of modified sodium alginate microspheres
Adding sodium alginate into deionized water, heating to 55 ℃, preserving heat, and stirring until the sodium alginate is completely dissolved to prepare sodium alginate solution with the concentration of 1.3 wt%; dropwise adding the sodium alginate solution into the calcium chloride solution with the volume of 4 times at the dropwise adding rate of 2.5mL/min under the stirring condition, continuously stirring for 5 hours after the dropwise adding is finished, and standing for 60 hours under the normal temperature environment; and filtering out sodium alginate microspheres, washing 3 times by adopting deionized water with the volume of 9 times, adding the sodium alginate microspheres into a modified liquid with the volume of 5 times, stirring for 35 hours, filtering out the sodium alginate microspheres, placing the sodium alginate microspheres in a constant-temperature drying oven, and drying the sodium alginate microspheres at the temperature of 85 ℃ for 5.5 hours to obtain the modified sodium alginate microspheres.
Wherein the concentration of the calcium chloride solution is 0.11mol/L.
The modifying liquid is deionized water solution dissolved with sodium citrate; the weight ratio of sodium citrate to deionized water in the modified liquid is 28:100.
3. Mixing
Sand, P.O 42.5.5 cement, fly ash, crushed stone powder, limestone powder, modified polypropylene fibers, modified sodium alginate microspheres, a polycarboxylate water reducer, sodium abietate and water are uniformly mixed to prepare the wet-mixed mortar.
The weight ratio of sand to P.O 42.5.5 cement to fly ash to crushed stone powder to limestone powder to modified polypropylene fibers to modified sodium alginate microspheres to polycarboxylate water reducer to sodium abietate to water is 1050:290:115:155:65:8:9:1.1:1.7:125.
Example 3
A preparation method of wet-mixed mortar specifically comprises the following steps:
1. polypropylene fiber modification
1) Primary fiber treatment
Adding polypropylene fibers into ethanol solution with the volume of 10 times, stirring for 3 hours, filtering out and adding the polypropylene fibers into deionized water with the volume of 10 times, performing ultrasonic dispersion for 60 minutes, stirring for 2 hours, filtering out and adding the polypropylene fibers into sulfuric acid solution with the volume of 5 times, heating to 55 ℃ at a heating rate of 0.4 ℃/min, and preserving heat and soaking for 2 hours; filtering, washing with 5 times of absolute ethyl alcohol and 5 times of deionized water, and drying at 65deg.C for 9 hr.
Wherein the length of the polypropylene fiber is 40mm and the diameter is 120 mu m.
The volume concentration of the ethanol solution was 50%.
The concentration of the sulfuric acid solution was 35wt%.
2) Secondary fiber treatment
And (3) adding the primary treatment object into 5 times of the first treatment liquid, heating to 95 ℃, preserving heat and stirring for 90min, filtering and adding into 5 times of the second treatment liquid, heating to 90 ℃, preserving heat and stirring for 90min, filtering and adding into 5 times of the third treatment liquid, heating to 85 ℃, preserving heat and stirring for 90min, filtering and washing 3 times by 10 times of deionized water, placing into a constant temperature drying oven, and drying at 55 ℃ for 9h to obtain the secondary treatment object.
Wherein the first treatment liquid is hydrogen peroxide solution with the concentration of 3 wt%.
The second treatment solution is hydrogen peroxide solution with the concentration of 6 weight percent.
The third treatment solution is a 13wt% hydrogen peroxide solution.
3) Surface treatment
Uniformly spraying the surface treatment liquid on the outer surface of the secondary treatment object, controlling the spraying speed to be 10g/min, controlling the dosage of the surface treatment liquid for each 100g of the secondary treatment object to be 4g, heating to 50 ℃ after the spraying is finished, and preserving heat and standing for 30h; and then transferring the polypropylene fibers into a constant temperature drying oven, and drying the polypropylene fibers at 60 ℃ to constant weight to obtain the modified polypropylene fibers.
The preparation method of the surface treatment liquid comprises the steps of putting nano silicon dioxide and sodium dodecyl sulfate into deionized water, uniformly dispersing, and stirring for 40min; adjusting the pH to 5.5 by adopting hydrochloric acid, continuously adding nano kaolin, nano titanium dioxide and a silane coupling agent KH-570, heating to 60 ℃, preserving heat, refluxing and stirring for 4 hours, and thus obtaining the surface treatment liquid.
In the surface treatment liquid, the weight ratio of nano silicon dioxide to sodium dodecyl sulfate to nano kaolin to nano titanium dioxide to silane coupling agent KH-570 to deionized water is 12:1:8:4:3:110.
The concentration of hydrochloric acid is 1mol/L.
2. Preparation of modified sodium alginate microspheres
Adding sodium alginate into deionized water, heating to 60 ℃, preserving heat, and stirring until the sodium alginate is completely dissolved to prepare sodium alginate solution with the concentration of 1.5 wt%; dropwise adding the sodium alginate solution into the calcium chloride solution with the volume being 5 times at the dropwise adding rate of 3mL/min under the stirring condition, continuously stirring for 6 hours after the dropwise adding is finished, and standing for 72 hours under the normal temperature environment; and filtering out sodium alginate microspheres, washing for 3 times by adopting 10 times of deionized water, adding into 6 times of modified liquid, stirring for 40 hours, filtering out and placing into a constant-temperature drying oven, and drying at 90 ℃ for 6 hours to obtain the modified sodium alginate microspheres.
Wherein the concentration of the calcium chloride solution is 0.12mol/L.
The modifying liquid is deionized water solution dissolved with sodium citrate; the weight ratio of sodium citrate to deionized water in the modified liquid is 30:100.
3. Mixing
Sand, P.O 42.5.5 cement, fly ash, crushed stone powder, limestone powder, modified polypropylene fibers, modified sodium alginate microspheres, a polycarboxylate water reducer, sodium abietate and water are uniformly mixed to prepare the wet-mixed mortar.
The weight ratio of sand to P.O 42.5.5 cement to fly ash to crushed stone powder to limestone powder to modified polypropylene fibers to modified sodium alginate microspheres to polycarboxylate water reducer to sodium abietate to water is 1100:300:120:160:70:9:10:1.2:1.8:130.
Comparative example 1
The technical scheme of the embodiment 2 is adopted, and the difference is that: 1) In the modification of polypropylene fiber, the steps of primary fiber treatment and secondary fiber treatment are omitted; 2) The step of preparing modified sodium alginate microspheres is omitted.
Comparative example 2
The technical scheme of the embodiment 2 is adopted, and the difference is that: 1) In the modification of polypropylene fibers, the surface treatment step is omitted; 2) Sodium alginate is adopted to replace modified sodium alginate microspheres for the mixing step.
The wet-mixed mortar of examples 1 to 3 and comparative examples 1 to 2 was used as a test sample, and the opening time, the volume weight, the water retention rate, the consistency, the flexural strength, the 7d compressive strength, the 28d compressive strength and the shrinkage of each test sample and the cured molded article were examined with reference to the relevant regulations in GB/T25181-2019 "premixed mortar" and JGJ/T70-2009 "basic test method Standard for building mortar". Meanwhile, each test sample is respectively placed in an equal-volume closed container, and after standing for 24 hours, whether bleeding layering phenomenon occurs or not is observed. The specific detection results are as follows:
further, each test sample is respectively placed in an equal-volume closed container, the temperature is kept at 45 ℃, and after standing for 24 hours, whether bleeding layering phenomenon occurs or not is observed; meanwhile, the consistencies, flexural strengths, 7d compressive strengths, 28d compressive strengths, and 28d shrinkage of the cured molded articles after high-temperature standing were examined. The specific detection results are as follows:
it can be seen that the wet-mixed mortar of examples 1 to 3 of the present invention uses sulfuric acid to perform primary fiber treatment on polypropylene fiber, uses hydrogen peroxide solutions with different concentrations to perform secondary fiber treatment, uses a surface treatment liquid with a specific composition to perform surface spray treatment, and uses the prepared modified polypropylene fiber in the mixing step of the wet-mixed mortar; meanwhile, modifying the sodium alginate microspheres by adopting a specific modifying liquid, and using the prepared modified sodium alginate microspheres in a mixing step of wet-mixed mortar; the specific raw material components in the mixing step are matched, so that the influence of the additive on the physical properties such as the compressive strength, the flexural strength and the like of the wet-mixed mortar can be effectively reduced, the opening time of the wet-mixed mortar can be prolonged, the volume weight of the wet-mixed mortar can be reduced, the bleeding performance can be improved, and meanwhile, the compressive strength and the flexural strength of the wet-mixed mortar can be improved; and the stability of the wet-mixed mortar in the transportation and storage processes or in the high-temperature environment is improved, and the subsequent application performance of the wet-mixed mortar is ensured.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The preparation method of the wet-mixed mortar is characterized by comprising the following steps of: modifying polypropylene fiber, preparing modified sodium alginate microspheres and mixing;
the polypropylene fiber is modified and consists of the following steps: primary fiber treatment, secondary fiber treatment, and surface treatment;
the primary fiber treatment is carried out, and after the polypropylene fiber is washed by ethanol solution and deionized water, the polypropylene fiber is put into sulfuric acid solution with the volume of 3-5 times, and the temperature is raised to 45-55 ℃, and the temperature is kept for soaking; filtering, washing with absolute ethyl alcohol and deionized water in sequence, and drying to obtain a primary treated matter;
the secondary fiber treatment, namely, putting the primary treatment object into a first treatment liquid with the volume being 3-5 times, heating to 90-95 ℃, preserving heat and stirring for a certain time, filtering out, putting the primary treatment object into a second treatment liquid with the volume being 3-5 times, heating to 85-90 ℃, preserving heat and stirring for a certain time, filtering out, putting the primary treatment object into a third treatment liquid with the volume being 3-5 times, heating to 80-85 ℃, preserving heat and stirring for a certain time, filtering out, washing, and drying to obtain a secondary treatment object;
in the secondary fiber treatment, the first treatment liquid, the second treatment liquid and the third treatment liquid are hydrogen peroxide solutions with different concentrations;
the surface treatment is carried out, the surface treatment liquid is uniformly sprayed on the outer surface of the secondary treatment object, after the spraying is finished, the temperature is raised to 40-50 ℃, the heat preservation and standing are carried out for 20-30 hours, and then the modified polypropylene fiber is obtained after drying;
the preparation method of the surface treatment liquid comprises the steps of putting nano silicon dioxide and sodium dodecyl sulfate into deionized water, uniformly dispersing, and stirring; regulating pH to 5-5.5, continuously adding nano kaolin, nano titanium dioxide and silane coupling agent KH-570, heating to 50-60 ℃, and carrying out heat preservation, reflux and stirring to obtain a surface treatment liquid;
the modified sodium alginate microspheres are prepared, the sodium alginate microspheres are put into a modified liquid with the volume of 4-6 times, stirred for 30-40h, filtered out and dried, and the modified sodium alginate microspheres are prepared;
the modifying liquid is deionized water solution in which sodium citrate is dissolved;
mixing sand, P.O 42.5.5 cement, fly ash, crushed stone powder, limestone powder, modified polypropylene fibers, modified sodium alginate microspheres, a polycarboxylate water reducer, sodium abietate and water uniformly to prepare the wet-mixed mortar.
2. The method for preparing wet-mixed mortar according to claim 1, wherein in the primary fiber treatment, the length of the polypropylene fiber is 25-40mm and the diameter is 80-120 μm;
the volume concentration of the ethanol solution is 40-50%;
the concentration of the sulfuric acid solution is 30-35wt%.
3. The method for preparing wet-mixed mortar according to claim 1, wherein in the secondary fiber treatment, the first treatment liquid is a hydrogen peroxide solution with a concentration of 2-3 wt%;
the second treatment solution is hydrogen peroxide solution with the concentration of 5-6wt%;
the third treatment solution is hydrogen peroxide solution with the concentration of 12-13 wt%.
4. The method for preparing wet-mixed mortar according to claim 1, wherein in the surface treatment, the spraying rate of the surface treatment liquid is 8-10g/min, and the amount of the surface treatment liquid per 100g of the secondary treated matter is 3-4g.
5. The method for preparing wet-mixed mortar according to claim 1, wherein in the surface treatment, the weight ratio of nano silicon dioxide, sodium dodecyl sulfate, nano kaolin, nano titanium dioxide, silane coupling agent KH-570 and deionized water in the surface treatment liquid is 10-12:0.8-1:6-8:3-4:2-3:100-110.
6. The method for preparing wet-mixed mortar according to claim 1, wherein sodium alginate is added into deionized water in the preparation of modified sodium alginate microspheres, the temperature is raised to 50-60 ℃, and the mixture is stirred at a constant temperature until the sodium alginate is completely dissolved, so as to prepare sodium alginate solution with the concentration of 1.2-1.5 wt%; dropwise adding the sodium alginate solution into the calcium chloride solution with the volume of 3-5 times at the dropwise adding rate of 2-3mL/min under the stirring condition, continuously stirring for 4-6h after the dropwise adding is finished, and standing for 48-72h under the normal temperature environment; then filtering out sodium alginate microspheres, washing for 2-3 times by adopting deionized water with the volume of 8-10 times, and then adding the sodium alginate microspheres into the modified treatment liquid;
the concentration of the calcium chloride solution is 0.1-0.12mol/L.
7. The method for preparing wet-mixed mortar according to claim 1, wherein in the preparation of the modified sodium alginate microspheres, the weight ratio of sodium citrate to deionized water in the modified liquid is 25-30:100.
8. The method for preparing wet-mixed mortar according to claim 1, wherein the weight ratio of sand, P.O 42.5.5 cement, fly ash, crushed stone powder, limestone powder, modified polypropylene fiber, modified sodium alginate microspheres, polycarboxylate water reducer, sodium abietate and water in the mixing is 1000-1100:280-300:110-120:150-160:60-70:7-9:8-10:1-1.2:1.5-1.8:120-130.
9. A wet-mix mortar prepared by the preparation method according to any one of claims 1 to 8.
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| WO2020183429A1 (en) * | 2019-03-14 | 2020-09-17 | Green Build Products India Pvt.Ltd. | A mortar composition and a process for its preparation |
| CN113912350A (en) * | 2021-11-09 | 2022-01-11 | 浙江龙游通衢建材有限公司 | High-quality concrete based on nano bamboo fibers and preparation method thereof |
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| JP2007534605A (en) * | 2004-04-27 | 2007-11-29 | ハーキュリーズ・インコーポレーテッド | Cement mortar for tiles using moisture retention agent |
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| CN1346380A (en) * | 1999-12-28 | 2002-04-24 | 金泽等 | Method of modifying polymeric material and use thereof |
| CN103936366A (en) * | 2014-03-27 | 2014-07-23 | 滁州市三和纤维制造有限公司 | Thermal insulation mortar containing polypropylene fiber |
| CN105294141A (en) * | 2014-07-29 | 2016-02-03 | 金承黎 | Nano porous concrete taking thixotropic colloid as template agent and preparation method |
| CN106478017A (en) * | 2016-09-28 | 2017-03-08 | 广西吉顺能源科技有限公司 | A kind of mortar of water-proof heat insulation |
| WO2020183429A1 (en) * | 2019-03-14 | 2020-09-17 | Green Build Products India Pvt.Ltd. | A mortar composition and a process for its preparation |
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