CN114230282A - High-durability polypropylene fiber polymer modified repair mortar and preparation method thereof - Google Patents
High-durability polypropylene fiber polymer modified repair mortar and preparation method thereof Download PDFInfo
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- CN114230282A CN114230282A CN202111614826.3A CN202111614826A CN114230282A CN 114230282 A CN114230282 A CN 114230282A CN 202111614826 A CN202111614826 A CN 202111614826A CN 114230282 A CN114230282 A CN 114230282A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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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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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-durability polypropylene fiber polymer modified repair mortar, which relates to the technical field of mortar processing and comprises polypropylene fiber/rubber powder modified mortar and polypropylene fiber/emulsion modified mortar, wherein the repair mortar takes styrene-acrylic emulsion and VAE emulsion as organic components, common portland cement as an inorganic component, a water reducing agent and a defoaming agent as functional auxiliaries, adopts polypropylene fiber to reinforce the mortar, utilizes the effective composition of an inorganic cement cementing material and an organic high polymer material, generates a two-component polymer through the interaction of polymer emulsion dehydration film forming and cement hydration reaction, can have the characteristics of good durability, high strength, low price, environmental protection, good deformation flexibility, strong caking property, water resistance, high tensile strength, good durability and the like of an inorganic cement-based material, has excellent technical performance advantages.
Description
Technical Field
The invention belongs to the technical field of mortar processing, and particularly relates to high-durability polypropylene fiber polymer modified repair mortar and a preparation method thereof.
Background
As the construction geological conditions of underground engineering in China are complex, the management and maintenance are not in place, the phenomena of leakage, lining cracking, surrounding rock damage and the like generally exist, the leakage hidden underground is called as 'cancer' of a building by an industry person, and the influence and loss caused by the leakage problem are difficult to estimate. The impact and loss caused by the leakage problem are difficult to estimate. Therefore, the leakage of the building structure is effectively solved, the service life is prolonged, and the method has important significance for the development of the building industry.
At present, common mortar is a repairing, waterproof and anti-permeability material commonly used in underground engineering. However, ordinary mortar is a typical brittle material, and low tensile strength and breaking strength cause poor toughness, and low bonding strength causes easy cracking; the compression strength and the elastic modulus are high, the folding pressure is low, and the deformation capability is insufficient. If the material is used as a repairing material, the interface is easy to be bonded firmly to cause cracking, the use is limited, and the repairing effect is poor for projects with higher requirements on construction efficiency and durability, so that the requirements are difficult to meet.
The polymer modification is to add a small amount of polymer in the molding process of cement mortar, thereby improving the performance of the mortar, improving the use quality, meeting the special requirements of actual engineering and having wide application fields and prospects. However, the existing polymer modified mortar has the defects of insufficient toughness, relatively low anti-permeability performance, weak corrosion resistance and the like, and is difficult to meet the requirement of underground engineering repair. The polypropylene fiber has the characteristics of high tensile strength and good durability, and can play a role in reinforcing and effectively improve the defects of polymer mortar when being doped into the mortar.
CN113121177A discloses a polyvinyl alcohol reinforced polymer repair mortar and a preparation method thereof. The polyvinyl alcohol enhanced polymer repair mortar has good performance, convenient and simple material taking, low price and simple construction process, can enhance the durability of the structure and save the maintenance cost, but has poor crack resistance and impermeability, and needs to be improved when being used as a repair, waterproof and impermeable material for underground engineering.
CN111205039A discloses a polymer repair mortar and a preparation method thereof. The polymer repair mortar has the advantages of strong frost resistance of repaired cracks, stable structure and difficult secondary cracking, but has the defects of low rupture strength, poor toughness, poor corrosion resistance and the like, and the service life of the material is shortened.
In order to solve the leakage problem of underground engineering and prolong the service life and overcome the defects of insufficient mechanical property, poor durability and the like in the existing repairing and waterproof impervious materials, the invention designs the high-durability polypropylene fiber/polymer modified repairing mortar and the preparation method thereof based on the design concept of adopting polypropylene fiber reinforced polymer mortar.
Disclosure of Invention
The invention aims to solve the existing problems and provides high-durability polypropylene fiber polymer modified repair mortar and a preparation method thereof.
The invention is realized by the following technical scheme:
a high-durability polypropylene fiber polymer modified repair mortar comprises polypropylene fiber/rubber powder modified mortar and polypropylene fiber/emulsion modified mortar,
wherein the polypropylene fiber/rubber powder modified mortar comprises the following components in proportion: 1 part of sand, 0.375 part of sand-lime ratio, 12 parts of poly-ash ratio, 0.39 part of water-lime ratio, 0.5 part of fiber mixing amount, 1 part of water reducing agent and 0.2 part of defoaming agent;
the polypropylene fiber/emulsion modified mortar comprises the following components in percentage by weight: 1 percent of sand, 0.458 percent of lime-sand ratio, 11 percent of aggregate-ash ratio, 0.38 percent of water-ash ratio, 0.3 percent of fiber mixing amount, 1 percent of water reducing agent and 0.2 percent of defoaming agent.
Further, the preparation of the polypropylene fiber/rubber powder modified mortar comprises the following steps:
(1) fully and uniformly mixing a water reducing agent, polypropylene fibers and half of water, and standing to disperse the fibers in a water reducing agent solution to obtain a mixed solution;
(2) pouring the sand and the mixed solution into a stirring pot, and slowly stirring for 30 s;
(3) slowly pouring cement and VEA rubber powder, and slowly stirring for 30 s;
(4) and adding the styrene-acrylic emulsion and the defoaming agent dispersed in the other half of the water into a stirring pot, slowly stirring for 30 seconds, and then quickly stirring for 60 seconds to obtain the polypropylene fiber/rubber powder modified mortar.
Further, the preparation of the polypropylene fiber/emulsion modified mortar comprises the following steps:
(1) fully and uniformly mixing a water reducing agent, polypropylene fibers and half of water, and standing to disperse the fibers in a water reducing agent solution to obtain a mixed solution;
(2) pouring the sand and the mixed solution into a stirring pot, and slowly stirring for 30 s;
(3) slowly pouring cement, and slowly stirring for 30 s;
(4) and adding the styrene-acrylic emulsion and the defoaming agent dispersed in the other half of the water into a stirring pot, slowly stirring for 30 seconds, and then quickly stirring for 60 seconds to obtain the polypropylene fiber/emulsion modified mortar.
Further, the rubber powder is VAE rubber powder, and the technical indexes are as follows: the coating is white powder in appearance and can move freely, the solid content is more than or equal to 98 percent, the ash content at 1000 ℃ is 10 +/-2 percent, the bulk density is 400-600 g/L, the average particle size is more than 80 mu m, the viscosity of 50 percent aqueous solution is more than or equal to 10pas, and the lowest film forming temperature is 5 ℃.
Further, the technical indexes of the styrene-acrylic emulsion are as follows: the appearance of the glass is milky white liquid with blue light, the solid content is 48 +/-2%, the viscosity is 500-1500 Mpa.s, the residual monomer content is less than or equal to 1.0%, the mechanical stability is 3000r/min, the glass transition temperature is 14-23 ℃ and the glass transition temperature is half an hour.
Further, the cement is 42.5-grade ordinary portland cement.
Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent mother liquor with the solid content of 40%.
Further, the performance indexes of the polypropylene fiber are as follows: the size of the fiber is bundle-shaped monofilament, the specific gravity is 0.91, the fiber diameter is 18-48 mu m, the tensile limit is more than 15%, the tensile strength is more than 358MPa, and the tensile modulus is more than 3.5 GPa.
Further, the performance indexes of the defoaming agent are as follows: the density is 0.974-0.980 g/cm3The content is 99.5 percent, the acid value is less than or equal to 0.2H + mmol/100g, the water content is less than or equal to 0.1, and the appearance is colorless and transparent.
Compared with the prior art, the invention has the following advantages:
1. the repair mortar is a high-performance composite material obtained by blending organic polymers, polypropylene fibers and cement serving as main raw materials, can have the characteristics of good durability, high strength, low price, environmental friendliness, good deformation flexibility, strong cohesiveness, water resistance, high tensile strength of polypropylene, good durability and the like of inorganic cement-based materials, and has excellent technical performance advantages.
2. The repair mortar is a two-component polymer which is prepared by taking styrene-acrylic emulsion and VAE emulsion as organic components, ordinary portland cement as an inorganic component, a water reducing agent and a defoaming agent as functional auxiliaries, reinforcing the mortar by adopting polypropylene fibers, effectively compounding an inorganic cement cementing material and an organic high polymer material, dehydrating the polymer emulsion to form a film and interacting the film with the hydration reaction of the cement.
Drawings
FIG. 1 is a flow chart of the preparation process of the polypropylene fiber/rubber powder modified mortar of the present application;
FIG. 2 is a flow chart of the preparation process of the polypropylene fiber/emulsion modified mortar of the present application.
Detailed Description
A high-durability polypropylene fiber polymer modified repair mortar comprises polypropylene fiber/rubber powder modified mortar and polypropylene fiber/emulsion modified mortar,
wherein the polypropylene fiber/rubber powder modified mortar comprises the following components in proportion: 1 part of sand, 0.375 part of sand-lime ratio, 12 parts of poly-ash ratio, 0.39 part of water-lime ratio, 0.5 part of fiber mixing amount, 1 part of water reducing agent and 0.2 part of defoaming agent;
the polypropylene fiber/emulsion modified mortar comprises the following components in percentage by weight: 1 percent of sand, 0.458 percent of lime-sand ratio, 11 percent of aggregate-ash ratio, 0.38 percent of water-ash ratio, 0.3 percent of fiber mixing amount, 1 percent of water reducing agent and 0.2 percent of defoaming agent.
The preparation method of the polypropylene fiber/rubber powder modified mortar comprises the following steps:
(1) fully and uniformly mixing a water reducing agent, polypropylene fibers and half of water, and standing to disperse the fibers in a water reducing agent solution to obtain a mixed solution;
(2) pouring the sand and the mixed solution into a stirring pot, and slowly stirring for 30 s;
(3) slowly pouring cement and VEA rubber powder, and slowly stirring for 30 s;
(4) and adding the styrene-acrylic emulsion and the defoaming agent dispersed in the other half of the water into a stirring pot, slowly stirring for 30 seconds, and then quickly stirring for 60 seconds to obtain the polypropylene fiber/rubber powder modified mortar.
The preparation of the polypropylene fiber/emulsion modified mortar comprises the following steps:
(1) fully and uniformly mixing a water reducing agent, polypropylene fibers and half of water, and standing to disperse the fibers in a water reducing agent solution to obtain a mixed solution;
(2) pouring the sand and the mixed solution into a stirring pot, and slowly stirring for 30 s;
(3) slowly pouring cement, and slowly stirring for 30 s;
(4) and adding the styrene-acrylic emulsion and the defoaming agent dispersed in the other half of the water into a stirring pot, slowly stirring for 30 seconds, and then quickly stirring for 60 seconds to obtain the polypropylene fiber/emulsion modified mortar.
The rubber powder is VAE rubber powder, and the technical indexes are as follows: the coating is white powder in appearance and can move freely, the solid content is more than or equal to 98 percent, the ash content at 1000 ℃ is 10 +/-2 percent, the bulk density is 400-600 g/L, the average particle size is more than 80 mu m, the viscosity of 50 percent aqueous solution is more than or equal to 10pas, and the lowest film forming temperature is 5 ℃.
The technical indexes of the styrene-acrylic emulsion are as follows: the appearance of the glass is milky white liquid with blue light, the solid content is 48 +/-2%, the viscosity is 500-1500 Mpa.s, the residual monomer content is less than or equal to 1.0%, the mechanical stability is 3000r/min, the glass transition temperature is 14-23 ℃ and the glass transition temperature is half an hour.
The cement is 42.5-grade ordinary portland cement.
The water reducing agent is a polycarboxylic acid high-performance water reducing agent mother liquor with the solid content of 40 percent.
The performance indexes of the polypropylene fiber are as follows: the size of the fiber is bundle-shaped monofilament, the specific gravity is 0.91, the fiber diameter is 18-48 mu m, the tensile limit is more than 15%, the tensile strength is more than 358MPa, and the tensile modulus is more than 3.5 GPa.
The performance indexes of the defoaming agent are as follows: the density is 0.974-0.980 g/cm3, the content is 99.5%, the acid value is less than or equal to 0.2H + mmol/100g, the water content is less than or equal to 0.1, and the appearance is colorless and transparent.
In order to compare the technical effect of the application, the performance of the mortar is tested. The method specifically comprises the following steps:
(1) basic mechanical properties:
the test is carried out according to the mixture ratio, a test piece is prepared, the mechanical property is tested after the maintenance for 28d, and the test result is as follows:
the polymer can improve the flexural strength, tensile strength and bonding strength of the mortar. Wherein the flexural strength of the emulsion modified mortar is improved by 2.67MPa, and the flexural strength of the rubber powder modified mortar is improved by 4.24 MPa; the tensile strength of the emulsion modified mortar is improved by 1.98MPa, and the tensile strength of the rubber powder modified mortar is improved by 2.78 MPa; the bonding tensile strength of the emulsion modified mortar is improved by 2.05MPa, and the bonding tensile strength of the rubber powder modified mortar is improved by 2.64 MPa.
(2) Freezing resistance:
and maintaining the polymer modified mortar test piece for 28 days, drying the test piece in a drying oven, then performing a water absorption test, performing a freeze-thaw cycle test after the water absorption test is finished, and testing the mass loss and the strength loss of the mortar after freeze thawing.
Quality and strength loss of mortar after 100 freeze-thaw cycles
After the polymer is added, the mass loss of the mortar is reduced, and the loss of the flexural strength, the compressive strength and the tensile strength is reduced.
(3) Shrinkage property:
the test piece is placed in a curing box for curing for 2d (the temperature is 20 +/-2) DEG C and the relative humidity after being demoulded>80%), placing in constant-temperature water at 20 + -2 deg.C, curing for 5 days, and measuring initial length L at the end of 7 days0. Then placing in an environment with the temperature of 20 +/-2 ℃ and the relative humidity of more than 60 +/-5 percent for curing for 28 days, and measuring the length L after shrinkage1. Shrinkage was measured for ages 14d, 21d, 28d, 35d, 42d, respectively.
Shrinkage and age of mortar (x 10)-6mm)
| 14d | 21d | 28d | 35d | 42d | |
| Ordinary mortar | 589 | 659 | 688 | 765 | 822 |
| Rubber powder modified mortar | 570 | 615 | 620 | 666 | 712 |
| Emulsion modified mortar | 580 | 632 | 628 | 698 | 738 |
Shrinkage rate:
note: e.g. of the typetShrinkage (%) of polymer-modified cement mortar; l is0-specimen reference length (mm); l is1-length (mm) of the test piece after curing;△-length of metal stylus (mm).
With the increase of age, the shrinkage of the mortar is gradually increased, the increase of the shrinkage of the modified mortar is slower than that of the common mortar, and the shrinkage at the later stage is basically unchanged; the polymer has certain water retention property, and the shrinkage of the mortar is smaller in the early hydration stage, so that the early shrinkage of the modified mortar is smaller than that of the common mortar, and meanwhile, the later shrinkage of the modified mortar is smaller.
(4) Cracking resistance:
and observing and measuring the length and the width of the crack after the test piece is molded, measuring the length and the width of the crack once every 6h when the crack does not appear, measuring the length and the width of the crack once every 1h after the crack appears, and measuring and recording the maximum crack width and the crack time after 28 h.
Test results of crack Property of repair mortar
The time of the modified mortar cracks is later than that of the common mortar, and the maximum crack width and the number of the cracks are smaller than those of the common mortar.
(5) Anti-permeability performance:
a impermeability test piece was prepared with reference to "concrete impermeability test" in SD105-1982[511(1) -80], followed by impermeability test.
Test result of impermeability of repair mortar
| Water pressure/MPa | Water penetration height/mm at 2MPa | |
| Ordinary mortar | 1.4 | 3.6 |
| Rubber powder modified mortar | 2.5 | 3.0 |
| Emulsion modified mortar | 2.3 | 3.3 |
Compared with the common mortar, the polymer modified repair mortar has increased water permeability, reduced water seepage height at 2MPa and obviously improved impermeability.
(6) Resistance to chloride salt corrosion:
the chlorine salt corrosion resistance test adopts a cubic test piece with 100mmx100mmx100mm, when the maintenance period is 28d, the upper bottom surface and the lower bottom surface of the test piece are sealed by epoxy resin, then the test piece is soaked in 2.5% NaCl solution, the distance between the upper bottom surface and the liquid level is 50mm, and the distance between the lower bottom surface and the bottom of the tank is 10 mm. After 28d, the test piece is split and the chloride penetration height is measured.
Mortar corrosion resistance test results
| Chloride penetration height/mm | |
| Ordinary mortar | 25.00 |
| Rubber powder modified mortar | 12.23 |
| Emulsion modified mortar | 11.74 |
The polymer modified repair mortar has reduced chloride ion permeation height and obviously improved chloride corrosion resistance.
Claims (9)
1. The high-durability polypropylene fiber polymer modified repair mortar is characterized by comprising polypropylene fiber/rubber powder modified mortar and polypropylene fiber/emulsion modified mortar,
wherein the polypropylene fiber/rubber powder modified mortar comprises the following components in proportion: 1 part of sand, 0.375 part of sand-lime ratio, 12 parts of poly-ash ratio, 0.39 part of water-lime ratio, 0.5 part of fiber mixing amount, 1 part of water reducing agent and 0.2 part of defoaming agent;
the polypropylene fiber/emulsion modified mortar comprises the following components in percentage by weight: 1 percent of sand, 0.458 percent of lime-sand ratio, 11 percent of aggregate-ash ratio, 0.38 percent of water-ash ratio, 0.3 percent of fiber mixing amount, 1 percent of water reducing agent and 0.2 percent of defoaming agent.
2. The high-durability polypropylene fiber polymer modified repair mortar as claimed in claim 1, wherein the preparation of the polypropylene fiber/rubber powder modified mortar comprises the following steps:
(1) fully and uniformly mixing a water reducing agent, polypropylene fibers and half of water, and standing to disperse the fibers in a water reducing agent solution to obtain a mixed solution;
(2) pouring the sand and the mixed solution into a stirring pot, and slowly stirring for 30 s;
(3) slowly pouring cement and VEA rubber powder, and slowly stirring for 30 s;
(4) and adding the styrene-acrylic emulsion and the defoaming agent dispersed in the other half of the water into a stirring pot, slowly stirring for 30 seconds, and then quickly stirring for 60 seconds to obtain the polypropylene fiber/rubber powder modified mortar.
3. The high-durability polypropylene fiber/emulsion modified repair mortar as claimed in claim 1, wherein the preparation of the polypropylene fiber/emulsion modified mortar comprises the following steps:
(1) fully and uniformly mixing a water reducing agent, polypropylene fibers and half of water, and standing to disperse the fibers in a water reducing agent solution to obtain a mixed solution;
(2) pouring the sand and the mixed solution into a stirring pot, and slowly stirring for 30 s;
(3) slowly pouring cement, and slowly stirring for 30 s;
(4) and adding the styrene-acrylic emulsion and the defoaming agent dispersed in the other half of the water into a stirring pot, slowly stirring for 30 seconds, and then quickly stirring for 60 seconds to obtain the polypropylene fiber/emulsion modified mortar.
4. The high-durability polypropylene fiber polymer modified repair mortar as claimed in claim 2, wherein the rubber powder is VAE rubber powder, and the technical indexes are as follows: the coating is white powder in appearance and can move freely, the solid content is more than or equal to 98 percent, the ash content at 1000 ℃ is 10 +/-2 percent, the bulk density is 400-600 g/L, the average particle size is more than 80 mu m, the viscosity of 50 percent aqueous solution is more than or equal to 10pas, and the lowest film forming temperature is 5 ℃.
5. The high-durability polypropylene fiber polymer modified repair mortar as claimed in claim 2 or 3, wherein the technical indexes of the styrene-acrylic emulsion are as follows: the appearance of the glass is milky white liquid with blue light, the solid content is 48 +/-2%, the viscosity is 500-1500 Mpa.s, the residual monomer content is less than or equal to 1.0%, the mechanical stability is 3000r/min, the glass transition temperature is 14-23 ℃ and the glass transition temperature is half an hour.
6. The high-durability polypropylene fiber polymer modified repair mortar of claim 2 or 3, wherein the cement is 42.5 grade Portland cement.
7. The high-durability polypropylene fiber polymer modified repair mortar of claim 2 or 3, wherein the water reducing agent is a 40% solid content polycarboxylic acid high performance water reducing agent mother liquor.
8. The high-durability polypropylene fiber polymer modified repair mortar as claimed in claim 2 or 3, wherein the polypropylene fiber has the following performance indexes: the size of the fiber is bundle-shaped monofilament, the specific gravity is 0.91, the fiber diameter is 18-48 mu m, the tensile limit is more than 15%, the tensile strength is more than 358MPa, and the tensile modulus is more than 3.5 GPa.
9. The high-durability polypropylene fiber polymer modified repair mortar as claimed in claim 2 or 3, wherein the performance index of the defoaming agent is as follows: the density is 0.974-0.980 g/cm3The content is 99.5 percent, the acid value is less than or equal to 0.2H + mmol/100g, the water content is less than or equal to 0.1, and the appearance is colorless and transparent.
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| CN115947576A (en) * | 2023-01-16 | 2023-04-11 | 中南大学 | Board bottom filling self-leveling mortar for airport assembly type runway |
| CN116063041A (en) * | 2022-12-30 | 2023-05-05 | 东台市凯仑商品混凝土有限公司 | High-tensile-property lightweight aggregate concrete based on modified mortar, and preparation method and application thereof |
| CN117125931A (en) * | 2023-08-28 | 2023-11-28 | 苏州南方混凝土有限公司 | Low-viscosity high-strength concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116063041A (en) * | 2022-12-30 | 2023-05-05 | 东台市凯仑商品混凝土有限公司 | High-tensile-property lightweight aggregate concrete based on modified mortar, and preparation method and application thereof |
| CN115947576A (en) * | 2023-01-16 | 2023-04-11 | 中南大学 | Board bottom filling self-leveling mortar for airport assembly type runway |
| CN117125931A (en) * | 2023-08-28 | 2023-11-28 | 苏州南方混凝土有限公司 | Low-viscosity high-strength concrete and preparation method thereof |
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Application publication date: 20220325 |