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CN-122010490-A - High-salt-corrosion-resistance concrete based on chloride ion chemical fixation and preparation method thereof

CN122010490ACN 122010490 ACN122010490 ACN 122010490ACN-122010490-A

Abstract

The invention discloses a chloride ion chemical fixation-based high salt corrosion resistant concrete and a preparation method thereof, wherein the concrete comprises, by weight, 270-400 parts of cement, 50-100 parts of mineral additives, 3-15 parts of styrene-acrylic emulsion, 600-800 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 5-10 parts of composite additives, 12-15 parts of salt corrosion resistant agents and 150-180 parts of water, the mineral additives consist of 1000 mesh fly ash, 2000 mesh fly ash and fly ash microbeads, the 1000 mesh fly ash addition accounts for 45-55% of the total mass of the mineral additives, the 2000 mesh fly ash addition accounts for 15-25% of the total mass of the mineral additives, the fly ash microbeads addition accounts for 25-35% of the total mass of the mineral additives, the composite additives consist of polycarboxylic acid type high-efficiency water reducer and air entraining agent, the polycarboxylic acid type high-efficiency water reducer addition accounts for 80-90% of the total mass of the composite additives, and the air entraining agent addition accounts for 10-20% of the total mass of the composite additives. The components of the concrete provided by the invention have synergistic effect, so that the strength and durability can be ensured on the basis of improving the salt corrosion resistance of the concrete.

Inventors

  • SHAO YU
  • JIANG RUISHUANG
  • SONG LANPING
  • WANG HAO
  • GUO BAOLIN
  • LIU SHUAI
  • GUO YONGZHI
  • Xu Kunmiao
  • WANG YI
  • WANG SHENGHUI
  • LIU YUE

Assignees

  • 山东省交通科学研究院
  • 山东高速股份有限公司

Dates

Publication Date
20260512
Application Date
20260130

Claims (8)

  1. 1. The concrete is characterized by comprising, by weight, 270-400 parts of cement, 50-100 parts of mineral additives, 3-15 parts of styrene-acrylic emulsion, 600-800 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 5-10 parts of composite additives, 12-15 parts of salt corrosion inhibitors and 150-180 parts of water; The mineral additive consists of 1000-mesh fly ash, 2000-mesh fly ash and fly ash microbeads, wherein the addition of the 1000-mesh fly ash accounts for 45-55% of the total mass of the mineral additive, the addition of the 2000-mesh fly ash accounts for 15-25% of the total mass of the mineral additive, and the addition of the fly ash microbeads accounts for 25-35% of the total mass of the mineral additive; the composite additive consists of a polycarboxylic acid type high-efficiency water reducer and an air entraining agent, wherein the addition amount of the polycarboxylic acid type high-efficiency water reducer accounts for 80-90% of the total mass of the composite additive, and the addition amount of the air entraining agent accounts for 10-20% of the total mass of the composite additive.
  2. 2. The chloride ion chemical fixation-based high salt corrosion resistant concrete according to claim 1, wherein the cement is ordinary portland cement, and the cement density is not lower than 3.05g/cm 3 , and the specific surface area is not lower than 300m 2 /kg.
  3. 3. The chloride ion chemical fixation-based high salt corrosion resistant concrete according to claim 1, wherein the mineral admixture has an average particle diameter of not more than 6 μm, a D90 of not more than 12 μm, and a specific surface area of not less than 5m 2 /g.
  4. 4. The chloride ion chemical fixation-based high-salt corrosion resistant concrete according to claim 1, wherein the solid content of the styrene-acrylic emulsion is more than 50%, the pH is 4-6, and the viscosity is less than 3000 mPa.s.
  5. 5. The chloride ion chemical fixation-based high-salt corrosion resistant concrete according to claim 1, wherein the fine aggregate is quartz sand or machine-made sand, the fineness modulus of the fine aggregate is 2-2.5, and the coarse aggregate is broken stone or pebble, and the particle size of the coarse aggregate is 5-20 mm.
  6. 6. The chloride ion chemical fixation-based high salt corrosion resistant concrete according to claim 1, wherein the salt corrosion resistant agent is composed of phosphogypsum and magnesite, the addition of the phosphogypsum accounts for 65-75% of the total weight of the salt corrosion resistant agent, and the addition of the magnesite accounts for 25-35% of the total weight of the salt corrosion resistant agent.
  7. 7. The chloride ion chemical fixation-based high salt corrosion resistant concrete as claimed in claim 6, wherein the salt corrosion resistant agent is prepared by adopting a grinding process, and the specific surface area after grinding is not less than 400m 2 /kg.
  8. 8. A method for preparing a concrete with high resistance to attack by salts based on chemical fixation of chloride ions according to any of claims 1 to 7, characterized in that it comprises the steps of: (1) Weighing cement, mineral admixture, fine aggregate and coarse aggregate according to a proportion, and uniformly mixing by using a stirrer to obtain mixed dry materials; (2) Weighing the composite additive and water according to a proportion, dissolving the composite additive in the water, and uniformly stirring to obtain a composite additive solution; (3) And (3) mixing the mixed dry material obtained in the step (1) with the composite additive solution obtained in the step (2), then adding the styrene-acrylic solution, uniformly stirring, and finally adding the salt corrosion inhibitor and continuously stirring until uniform to obtain the concrete slurry.

Description

High-salt-corrosion-resistance concrete based on chloride ion chemical fixation and preparation method thereof Technical Field The invention relates to the technical field of concrete preparation, in particular to a high-salt-corrosion-resistance concrete based on chloride ion chemical fixation and a preparation method thereof. Background In coastal areas, saline-alkali lands and cold areas where deicing salt is used, concrete structures are exposed to high-salt environments for a long time and are easy to be corroded by salts, especially chloride salts are easy to cause corrosion of reinforcing steel bars, so that the strength of the concrete is reduced, and the durability and safety of a building are further affected. The traditional concrete has poor salt corrosion resistance, and is difficult to meet engineering requirements in the special environments. Therefore, the development of the concrete with high salt corrosion resistance, which has the advantages of curing chloride ions and simple preparation process, has important significance. Although the high-salt-corrosion-resistant concrete has been studied more at present, the cost of the salt-corrosion-resistant technology and the process are complex, the concrete formulation needs a plurality of additives for coordination, the raw material cost is high, and especially the strength and the durability are not balanced at the same time, so that the application of the high-salt-corrosion-resistant concrete is limited. Disclosure of Invention In order to solve the technical problems, the invention provides the high-salt-corrosion-resistance concrete based on chloride ion chemical fixation and the preparation method thereof, and the components are synergistic, so that the strength and the durability can be ensured on the basis of improving the salt corrosion resistance of the concrete. The invention adopts the technical scheme that: The invention provides a chloride ion chemical fixation-based high-salt corrosion resistance concrete, which comprises, by weight, 270-400 parts of cement, 50-100 parts of mineral additives, 3-15 parts of styrene-acrylic emulsion, 600-800 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 5-10 parts of composite additives, 12-15 parts of salt corrosion resistance agents and 150-180 parts of water; The mineral additive consists of 1000-mesh fly ash, 2000-mesh fly ash and fly ash microbeads, wherein the addition of the 1000-mesh fly ash accounts for 45-55% of the total mass of the mineral additive, the addition of the 2000-mesh fly ash accounts for 15-25% of the total mass of the mineral additive, and the addition of the fly ash microbeads accounts for 25-35% of the total mass of the mineral additive; the composite additive consists of a polycarboxylic acid type high-efficiency water reducer and an air entraining agent, wherein the addition amount of the polycarboxylic acid type high-efficiency water reducer accounts for 80-90% of the total mass of the composite additive, and the addition amount of the air entraining agent accounts for 10-20% of the total mass of the composite additive. Further, the cement is 42.5 or 52.5 ordinary Portland cement, the cement density is not lower than 3.05g/cm 3, and the specific surface area is not lower than 300m 2/kg. Further, the mineral admixture has an average particle diameter of not more than 6 μm, a D90 of not more than 12 μm, and a specific surface area of not less than 5m 2/g. Further, the solid content of the styrene-acrylic emulsion is more than 50%, the pH is 4-6, and the viscosity is less than 3000 mPa.s. Further, the fine aggregate is quartz sand or machine-made sand, the fineness modulus of the fine aggregate is 2-2.5, the coarse aggregate is broken stone or pebble, and the particle size of the coarse aggregate is 5-20 mm. Further, the salt corrosion inhibitor consists of phosphogypsum and magnesite, wherein the addition of the phosphogypsum accounts for 65-75% of the total weight of the salt corrosion inhibitor, and the addition of the magnesite accounts for 25-35% of the total weight of the salt corrosion inhibitor. Further, the salt corrosion resistant agent is prepared by adopting a grinding process, and the specific surface area after grinding is not less than 400m 2/kg. In a second aspect, the invention also provides a preparation method of the concrete with high salt corrosion resistance based on chloride ion chemical fixation, comprising the following steps: (1) Weighing cement, mineral admixture, fine aggregate and coarse aggregate according to a proportion, and uniformly mixing by using a stirrer to obtain mixed dry materials; (2) Weighing the composite additive and water according to a proportion, dissolving the composite additive in the water, and uniformly stirring to obtain a composite additive solution; (3) And (3) mixing the mixed dry material obtained in the step (1) with the composite additive solution obtained in the step (2), then adding the styrene-a