Rapid repairing agent for concrete pavement with high freezing and thawing resistance

Abstract

The invention relates to the technical field of concrete ground repairing materials, in particular to a rapid repairing agent for a high-freeze-thaw-resistant concrete pavement. Comprising the following raw materials in parts by weight: 350-450 parts of quick-setting and quick-hardening high belite sulphoaluminate cement, 50-150 parts of Portland cement, 0-30 parts of silica fume, 45-600 parts of river sand, 0-5 parts of a cement plasticizer, 0.3-5 parts of a defoaming agent, 1-5 parts of a retarder, 1-10 parts of a coagulant, 5-35 parts of a crystallizing agent, 1.5-10 parts of a nano nucleating agent and 15-60 parts of a binder. The compactness and crack resistance of the repairing material are improved; meanwhile, the coagulant and the nano nucleating agent are added, so that the early strength of the cement repairing material can be remarkably improved, the initial setting time of the cement repairing material is shortened, and the early compressive strength of mortar is improved, so that rapid repairing of a concrete pavement is realized, and compared with base concrete which is high in bonding strength, low in shrinkage and high in impermeability, and the freeze-thaw resistance is doubled compared with the standard requirement of the freeze-thaw resistance.

Description

Technical Field

[0001] The invention relates to the technical field of concrete floor repair materials, and in particular to a high freeze-thaw resistance concrete pavement quick repair agent. Background Art

[0002] Ordinary concrete floor quick repair materials have been widely used in the repair of road surfaces damaged by freeze-thaw damage on concrete surfaces in the early days due to their high strength, quick traffic within 1 to 6 hours, high bonding strength and low maintenance cost. However, in recent years, extreme low temperatures have occurred frequently and lasted for a long time, and the temperature after snow is extremely low (below minus 20 degrees Celsius). Ordinary floor repair materials cannot meet the on-site repair requirements. After freeze-thaw damage, the repaired ground still causes peeling, roughness and other phenomena after freeze-thaw damage.

[0003] Ordinary concrete floor quick repair materials can only meet the general low temperature environment, and the freeze-thaw performance is not excellent enough. Therefore, in order to improve the durability of the quick repair of concrete pavement, we proposed a high freeze-thaw resistance concrete pavement quick repair agent. Summary of the invention

[0004] In order to make up for the deficiencies in the prior art and achieve the above functions, the present invention provides a high freeze-thaw resistance concrete pavement rapid repair agent.

[0005] The present invention is achieved through the following technical solutions: A high freeze-thaw resistance concrete pavement rapid repair agent comprises the following raw materials in parts by weight: 350-450 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50-150 parts of silicate cement, 0-30 parts of silica fume, 450-600 parts of river sand, 0-5 parts of cement plasticizer, 0.3-5 parts of defoamer, 1-5 parts of retarder, 1-10 parts of accelerator, 5-35 parts of crystallizer, 1.5-10 parts of nano nucleating agent and 15-60 parts of binder.

[0006] Further, in order to better realize the present invention, the following raw materials are included in parts by weight: 400 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50 parts of ordinary Portland cement, 15 parts of silica fume, 500 parts of river sand, 1.8 parts of cement plasticizer, 2.5 parts of defoamer, 1 part of retarder, 1 part of accelerator, 25 parts of crystallizer, 2 parts of nano nucleating agent, and 50 parts of binder. Further, in order to better realize the present invention, the cement plasticizer is any one of polycyclic aromatic sulfonate, sulfonated melamine formaldehyde condensate, and polycarboxylic acid cement plasticizer.

[0007] Further, in order to better realize the present invention, the retarder is one of citric acid, tartaric acid, dihydrate gypsum or borax or any combination thereof. Further, in order to better realize the present invention, the defoamer is an organosilicon defoamer. Further, in order to better realize the present invention, the accelerator is one of lithium carbonate, lithium sulfate, lithium chloride or aluminum sulfate or any combination thereof. Further, in order to better realize the present invention, the crystallizer is one of sodium silicate, sodium metasilicate, silicon barrel zirconium, inorganic cement oxidant or any combination thereof.

[0008] Furthermore, in order to better realize the present invention, the nano nucleating agent is a cement nano reinforcing agent.

[0009] Furthermore, in order to better realize the present invention, the binder is one or a combination of any of ethylene / vinyl acetate copolymer, vinyl acetate / versatate copolymer, and acrylic copolymer.

[0010] Furthermore, in order to better realize the present invention, the raw material also includes water, and the water-to-material ratio is 0.14-0.18.

[0011] The beneficial effects of the present invention are: 1. The high freeze-thaw resistance concrete pavement quick repair material provided by the present invention takes fast-setting and fast-hardening high-belite sulphoaluminate cement as the main component, fully utilizes its micro-expansion and low shrinkage characteristics, and adds a small amount of ordinary Portland cement modification to improve the later strength of the mortar; the addition of continuously graded river sand reduces the water-cement ratio and improves the density and crack resistance of the repair material; at the same time, the addition of a coagulant and a nano-nucleating agent can significantly improve the early strength performance of the cement repair material, accelerate the initial setting time of the cement repair material, and improve the early compressive strength of the mortar, thereby realizing the rapid repair of the concrete pavement.

[0012] 2. The high freeze-thaw resistance concrete pavement rapid repair material provided by the present invention mainly reduces the water-cement ratio of mortar by adding cement plasticizer, improves the density of mortar by adding silica fume, and reacts with cement to generate acetylene by adding crystallizer, thereby reducing the content of harmful pores in mortar, and reacts with calcium hydroxide in cement to generate water-insoluble crystals, thereby blocking the capillary pores and microcracks in mortar, making mortar denser, and greatly improving the anti-seepage ability of mortar, and the anti-seepage pressure can reach 3.5 MPa.

[0013] 3. The present invention has excellent antifreeze performance, excellent hourly strength, higher flexural strength and tensile bonding strength, and is waterproof, crack-resistant and impermeable, and is suitable for the rapid repair of concrete surface layers of roads, airports and other buildings. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0016] Embodiment 1: A high freeze-thaw resistance concrete pavement rapid repair material, comprising 400 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50 parts of silicate cement, 36 parts of silica fume, 440 parts of river sand, 2.5 parts of cement plasticizer, 2.5 parts of defoamer, 1 part of retarder, 1 part of accelerator, 25 parts of crystallizer, 2 parts of nano nucleating agent, and 50 parts of binder. The cement plasticizer is any one of polycyclic aromatic sulfonate, sulfonated melamine formaldehyde condensate, and polycarboxylic acid cement plasticizer.

[0017] The retarder is one of citric acid, tartaric acid, dihydrate gypsum or borax or any combination thereof. The defoamer is an organosilicon defoamer. The coagulant is one of lithium carbonate, lithium sulfate, lithium chloride or aluminum sulfate or any combination thereof. The crystallizer is one of sodium silicate, sodium metasilicate, silicon barrel zirconium, inorganic cement oxidant or any combination thereof.

[0018] The nano nucleating agent is a cement nano reinforcing agent.

[0019] The binder is one or a combination of ethylene / vinyl acetate copolymer, vinyl acetate / versatate copolymer, and acrylic acid copolymer. The raw materials also include water, and the water-to-material ratio is 0.14:1. Example 2: A high freeze-thaw resistance concrete pavement rapid repair material, comprising 400 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50 parts of silicate cement, 27 parts of silica fume, 450 parts of river sand, 2 parts of cement plasticizer, 1.5 parts of retarder, 3 parts of accelerator, 7.5 parts of crystallizer, 3 parts of nano nucleating agent, and 35 parts of binder. The cement plasticizer is any one of polycyclic aromatic sulfonate, sulfonated melamine formaldehyde condensate, and polycarboxylic acid cement plasticizer.

[0020] The retarder is one of citric acid, tartaric acid, dihydrate gypsum or borax or any combination thereof. The defoamer is an organosilicon defoamer. The coagulant is one of lithium carbonate, lithium sulfate, lithium chloride or aluminum sulfate or any combination thereof. The crystallizer is one of sodium silicate, sodium metasilicate, silicon barrel zirconium, inorganic cement oxidant or any combination thereof.

[0021] The nano nucleating agent is a cement nano reinforcing agent.

[0022] The binder is one or a combination of any of ethylene / vinyl acetate copolymer, vinyl acetate / versatate vinyl copolymer and acrylic copolymer.

[0023] The inorganic color powder is one of iron red, carbon black, cobalt blue or lemon yellow or any combination thereof. The raw materials also include water, and the water-to-material ratio is 0.18:1. Example 3: A high freeze-thaw resistance concrete pavement rapid repair material, comprising 400 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50 parts of silicate cement, 15 parts of silica fume, 450 parts of river sand, 2 parts of cement plasticizer, 1.5 parts of retarder, 3 parts of accelerator, 15 parts of crystallizer, 3 parts of nano nucleating agent, and 25 parts of binder. The cement plasticizer is any one of polycyclic aromatic sulfonate, sulfonated melamine formaldehyde condensate, and polycarboxylic acid cement plasticizer.

[0024] The retarder is one of citric acid, tartaric acid, dihydrate gypsum or borax or any combination thereof. The defoamer is an organosilicon defoamer. The coagulant is one of lithium carbonate, lithium sulfate, lithium chloride or aluminum sulfate or any combination thereof. The crystallizer is one of sodium silicate, sodium metasilicate, silicon barrel zirconium, inorganic cement oxidant or any combination thereof.

[0025] The nano nucleating agent is a cement nano reinforcing agent.

[0026] The binder is one or a combination of ethylene / vinyl acetate copolymer, vinyl acetate / versatate vinyl copolymer, and acrylic acid copolymer. The raw materials also include water, and the water-to-material ratio is 0.16:1.

[0027] Refer to the CRRM-Ⅰ model with the shortest open time among cement-based repair materials in the national standard JT / T1211.1-2018 for rapid repair materials for cement concrete in highway engineering. The performance test results are as follows: As can be seen from the above table, the initial setting time of the high freeze-thaw resistance concrete pavement rapid repair material prepared in Examples 1-3 of the present invention is 18 to 23 minutes, which is greater than the standard 15 minutes; the bonding strength with the base concrete in 1 day is 1.6 to 2.3 MPa, which is greater than the standard 1.5 MPa; the shrinkage rate in 28 days is 0.010% to 0.014%, which is less than the standard 0.02%; the compressive strength for open traffic is 33 to 38 MPa, which is greater than the standard 30 MPa, and the flexural strength is 5.5 to 6.1 MPa, which is greater than the standard 4.5 MPa; the mortar is open to traffic in 1 day. The compressive strength is 46-52Mpa, which is greater than the standard 40Mpa, and the flexural strength is 7.5-8.3Mpa, which is greater than the standard 5.5Mpa; the compressive strength of the mortar open to traffic for 28 days is 72.6-77.8Mpa, and the flexural strength is 11.7-12.6Mpa; therefore, the high freeze-thaw resistance concrete pavement rapid repair material prepared by the present invention has high early strength while meeting the construction time, higher bonding strength than the base concrete, low shrinkage and high impermeability effects, and is twice as high as the freeze-thaw resistance performance standard requirement.

[0028] The inorganic cement oxidant of the present invention can promote the oxidation reaction of all metal elements in cement and coarse and fine aggregates, produce high electrolyte, break up and decompose cement particles, accelerate its hydration speed, and achieve complete hydration. A large amount of high-concentration cement paste is produced in the oxidation reaction, so that the cement has the best adhesiveness and density. The hardened concrete has the characteristics of high-performance concrete such as acid resistance, halogen resistance, seawater chloride ion corrosion resistance, water penetration resistance, shrinkage cracking resistance, improved compressive strength and early strength, and can increase the durability of concrete.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A high freeze-thaw resistance concrete pavement rapid repair agent, characterized by: The invention comprises the following raw materials in parts by weight: 350-450 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50-150 parts of silicate cement, 0-30 parts of silica fume, 450-600 parts of river sand, 0-5 parts of cement plasticizer, 0.3-5 parts of defoamer, 1-5 parts of retarder, 1-10 parts of accelerator, 5-35 parts of crystallizer, 1.5-10 parts of nano nucleating agent and 15-60 parts of binder.

2. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 is characterized in that: The invention comprises the following raw materials in parts by weight: 400 parts of fast-setting and fast-hardening high-belite sulphoaluminate cement, 50 parts of ordinary Portland cement, 15 parts of silica fume, 500 parts of river sand, 1.8 parts of cement plasticizer, 2.5 parts of defoamer, 1 part of retarder, 1 part of accelerator, 25 parts of crystallizer, 2 parts of nano nucleating agent and 50 parts of binder.

3. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The cement plasticizer is any one of polycyclic aromatic sulfonates, sulfonated melamine formaldehyde condensates, and polycarboxylic acid-based cement plasticizers.

4. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The retarder is one of citric acid, tartaric acid, dihydrate gypsum or borax, or a combination of any of them.

5. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The defoaming agent is an organosilicon defoaming agent.

6. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The coagulant is one of lithium carbonate, lithium sulfate, lithium chloride or aluminum sulfate or a combination of any of them.

7. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The crystallizing agent is one of sodium silicate, sodium metasilicate, silicon barrel zirconium, and inorganic cement oxidant, or a combination of any of them.

8. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The nano nucleating agent is a cement nano reinforcing agent.

9. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The binder is one or a combination of ethylene / vinyl acetate copolymer, vinyl acetate / versatate copolymer, and acrylic copolymer.

10. The high freeze-thaw resistance concrete pavement rapid repair agent according to claim 1 or 2, characterized in that: The raw materials also include water, and the water-to-material ratio is 0.14-0.18.

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