CN-121974629-A - Sulfate-resistant corrosion-resistant concrete and preparation method and application thereof

Abstract

The invention belongs to the technical field of marine concrete, and particularly relates to sulfate-resistant corrosion-resistant concrete, and a preparation method and application thereof. The sulfate-resistant corrosion-resistant concrete comprises, by mass, 200-400 parts of cement, 30-60 parts of fly ash, 30-60 parts of slag powder, 800-1200 parts of crushed stone, 30-60 parts of an expanding agent, 500-900 parts of sand, 5-15 parts of a water reducer, 10-30 parts of an erosion inhibitor and 100-200 parts of water, wherein the erosion inhibitor comprises nano silicon dioxide, silane modified mica powder and modified expanded perlite, and the modified expanded perlite is formed by coating the expanded perlite with a water-absorbing swelling material after loading a chelating agent. The sulfate-resistant corrosion-resistant concrete provided by the invention has excellent sulfate corrosion resistance under the conditions of low humidity and semi-soaking.

Inventors

• LIU FEI
• CAO SHUAI
• LI GUOYOU
• HAN GUIXIN
• Chai Lekai

Assignees

• 秦皇岛海三建筑构件制造有限公司

Dates

Publication Date

20260505

Application Date

20260130

Claims (10)

1. 1. The sulfate-resistant corrosion-resistant concrete is characterized by comprising, by mass, 200-400 parts of cement, 30-60 parts of fly ash, 30-60 parts of slag powder, 800-1200 parts of crushed stone, 30-60 parts of an expanding agent, 500-900 parts of sand, 5-15 parts of a water reducer, 10-30 parts of an erosion inhibitor and 100-200 parts of water; the corrosion inhibitor comprises nano silicon dioxide, silane modified mica powder and modified expanded perlite; the modified expanded perlite is formed by coating expanded perlite with a chelating agent and then a water-absorbing swelling material.
2. 2. The sulfate-resistant corrosion-resistant concrete according to claim 1, wherein the sulfate-resistant corrosion-resistant concrete comprises, by mass, 250-350 parts of cement, 40-50 parts of fly ash, 40-50 parts of slag powder, 1000-1100 parts of crushed stone, 40-50 parts of an expanding agent, 700-800 parts of sand, 10-12 parts of a water reducer, 20-25 parts of an erosion inhibitor and 150-200 parts of water.
3. 3. The sulfate-resistant, corrosion-resistant concrete according to claim 1 or 2, wherein the silane comprises a fluorosilane and an ureido silane in a mass ratio of 1-2:1-2.
4. 4. A sulfate resistant corrosion resistant concrete according to claim 3, wherein said fluorosilane is (3, 3-trifluoropropyl) methyldimethoxysilane and/or (3, 3-trifluoropropyl) trimethoxysilane and said ureido silane is 3-ureidopropyltriethoxysilane and/or 3-ureidopropyltrimethoxysilane.
5. 5. The sulfate-resistant corrosion-resistant concrete according to claim 4, wherein the preparation method of the silane-modified mica powder comprises the steps of mixing silane with an ethanol aqueous solution, hydrolyzing to obtain a silane hydrolysate, adding the mica powder into the hydrolysate, reacting, filtering, washing and drying after the reaction is finished.
6. 6. The sulfate-resistant, corrosion-resistant concrete according to claim 1 or 2, wherein the chelating agent comprises phytic acid and hydroxyethylidene diphosphonic acid, and the water-swellable material is gelatin and sodium alginate.
7. 7. The sulfate-resistant, corrosion-resistant concrete according to claim 6, wherein the mass ratio of phytic acid to hydroxyethylidene diphosphonic acid is 1-3:1-3, and the mass ratio of gelatin to sodium alginate is 5-8:1.
8. 8. The sulfate-resistant corrosion-resistant concrete of claim 7, wherein the preparation method of the modified expanded perlite comprises the steps of heating the expanded perlite, placing the heated expanded perlite in a chelating agent aqueous solution, vacuumizing, stirring, centrifuging and drying to obtain the chelating agent-loaded expanded perlite, dissolving gelatin and sodium alginate in water, adding the chelating agent-loaded expanded perlite, stirring uniformly, adjusting pH, reacting, cooling, adjusting pH, adding glutaraldehyde, solidifying, filtering, washing and drying.
9. 9. The method for preparing the sulfate-resistant corrosion-resistant concrete according to any one of claims 1 to 8, which is characterized by comprising the following steps of mechanically stirring cement, fly ash, slag powder, crushed stone, expanding agent, sand, water reducing agent, corrosion inhibitor and water uniformly.
10. 10. Use of the sulfate-resistant, corrosion-resistant concrete of any one of claims 1 to 8 in semi-buried concrete structures in low-humidity environments.

Description

Sulfate-resistant corrosion-resistant concrete and preparation method and application thereof Technical Field The invention belongs to the technical field of marine concrete, and particularly relates to sulfate-resistant corrosion-resistant concrete, and a preparation method and application thereof. Background The concrete is the building material with the most wide application and the greatest dosage in the building engineering, and the marine concrete is formed by mixing marine cement, sand, stones (large aggregate) and water. In coastal areas and salt lake areas, sulfate corrosion often occurs in marine concrete, sulfate enters the concrete, sulfate reacts with cement hydration products such as calcium hydroxide, calcium aluminate hydrate, calcium silicate hydrate and the like in the concrete to generate expansive products such as gypsum, ettringite and the like, so that the volume of the concrete expands, the surface layer of the concrete peels off and cracks, and the safety of the whole structure is even threatened, so that the improvement of the sulfate corrosion resistance of the concrete is an urgent problem to be solved. The sulfate corrosion resistance of concrete in the prior art is mainly focused on full-immersion sulfuric acid corrosion, for example, china patent with the authority of publication No. CN120157428B discloses a high-crack-resistance long-service-life concrete product and a preparation method thereof, and the concrete product comprises the following components of 70-90 parts of aluminoferrite cement, 15-30 parts of fly ash, 10-25 parts of slag, 0.05-0.2 part of modified boron nitride nano-sheet, 3-8 parts of hybrid binder, 0.2-0.8 part of double-anti-release diatom ball, 2-5 parts of composite anticracking agent, 0.5-1.5 parts of nano-clay fiber compound and 1.5-3 parts of bacterial adhesive compound agent. According to the technical scheme, through gradient layering design and hybridization of the binder and the nanofiber, the compression resistance and the fracture resistance of the marine cement concrete material are remarkably improved, and the crack resistance is superior to that of the prior art. The Poisson's ratio is lower, which shows that the transverse deformation is smaller under the stress, the structural stability is higher, and the micro crack expansion can be effectively restrained. The Chinese patent publication No. CN120383470A discloses a high-durability self-compacting ferroaluminate cement-based concrete and a preparation method thereof, wherein the self-compacting ferroaluminate cement-based self-compacting concrete comprises 60-70 parts of freeze-thawing resistant clinker, 20-30 parts of chlorine-resistant steel slag micropowder, 8-13 parts of high-strength corrosion-resistant desulfurized gypsum, 0.8-1.3 parts of additive, 88-124 parts of coarse aggregate, 76-116 parts of fine aggregate and 22-38 parts of water. The freeze-thawing resistant clinker of the technical proposal enhances the frost resistance of concrete by reducing the porosity and the pore diameter. The desulfurization gypsum after the regulation and control of the crystal forms enhances the sulfate erosion resistance of the concrete. The PAA/QCS-CA hydrogel enables early strength of concrete to be rapidly increased, construction progress is quickened, and airport pavement is guaranteed to be rapidly put into use. The high-strength corrosion-resistant desulfurized gypsum can promote early hydration of cement and improve early strength. However, the sulfate resistance tests of the above technical solutions were all immersed in 5% Na 2SO4 solution. Dan Yanran, yu Yi, zhu Peng fly. Study of sulfate attack resistance of semi-soaked concrete in low humidity environment [ J ]. Low temperature construction technique, 2022,292:54-62 reports that low humidity environment is more corrosive to partially soaked concrete sulfate attack than fully soaked sulfate attack, however there are few reports in the prior art about sulfate resistance of semi-soaked concrete in low humidity environment. Disclosure of Invention The first object of the invention is to provide a sulfate-resistant corrosion-resistant concrete, which has excellent sulfate corrosion resistance under low-humidity and semi-soaking conditions. The second object of the invention is to provide a method for preparing the sulfate-resistant corrosion-resistant concrete. A third object of the present invention is to provide the use of the sulfate-resistant, corrosion-resistant concrete in semi-buried concrete structures in low-humidity environments. In order to achieve the above object of the present invention, the following technical solutions are specifically adopted: In a first aspect, the invention provides sulfate-resistant corrosion-resistant concrete, which comprises, by mass, 200-400 parts of cement, 30-60 parts of fly ash, 30-60 parts of slag powder, 800-1200 parts of crushed stone, 30-60 parts of an expanding agent, 500-900 parts of sand, 5-