Seawater corrosion resisting mineral additive for concrete, and preparation method thereof

Abstract

The invention discloses a seawater corrosion resisting mineral additive for concrete, and a preparation method thereof. The seawater corrosion resisting mineral additive for concrete comprises components of, by weight: 15 to 40% of calcium sulphoaluminate mineral, 10 to 40% of anhydrite, 10 to 30% of calcined diatomite, 10 to 30% of natural volcanic ash, 5 to 25% of quartz powder, and 2 to 8% of an auxiliary agent. The seawater corrosion resisting mineral additive provided by the invention has good corrosion resisting capacities against corrosion media such as Na2SO4, NaCl, and MgSO4. The corrosion resisting coefficient is higher than 0.9. Therefore, the mineral additive can be used for preparing high-strength high-performance seawater corrosion resisting concrete, or underwater concrete placed in corrosion media. The mineral additive can also be used in water conservancy and hydropower projects for improving the corrosion medium resisting performances of buildings, wherein in the corrosion media comprise sulfate, chloridion, and the like. With the mineral additive, cracks of buildings can be reduced or eliminated, and the service lives of the buildings can be prolonged.

Description

[technical field]

[0001] The invention relates to a concrete admixture, in particular to a concrete seawater erosion-resistant mineral admixture and a preparation method thereof. [Background technique]

[0002] In recent years, with the vigorous development of marine resource exploration and mining, the volume of seaborne cargo has continued to increase, and various marine engineering projects such as offshore oil drilling platforms, ports, wharves, cross-sea tunnels and bridges have increased rapidly. The demand for admixtures is increasing year by year, and the marine construction industry urgently needs multifunctional concrete anti-corrosion admixture products.

[0003] The traditional common method of preparing seawater erosion-resistant concrete is to add rust inhibitor, micro-expansion agent, air-entraining agent, water reducing agent, etc. when preparing concrete. Due to the compatibility problems of different types of admixtures, it may lead to deterioration of conc...

Examples

Embodiment 1

[0050] According to weight percentage, weigh 30% of anhydrous calcium sulfoaluminate mineral, 20% of anhydrite, 20% of calcined diatomite, 14% of natural pozzolan, 10% of quartz powder, and grind together until the specific surface area is 410m 2 / kg, 1.2% remaining on 0.08mm square hole sieve; then mixed with 3% of rust inhibitor, 0.1% of air-entraining agent, 0.4% of cellulose, and 2.5% of calcium stearate to obtain the product.

Embodiment 2

[0052] According to weight percentage, weigh 20% of anhydrous calcium sulfoaluminate mineral, 15% of anhydrite, 30% of calcined diatomite, 17.85% of natural pozzolan, and 15% of quartz powder, and grind them together until the specific surface area is 350m 2 / kg, 0.08mm square hole sieve remaining 1.8%; then mixed with 1% of rust inhibitor, 0.05% of air-entraining agent, 0.1% of cellulose, and 1% of calcium stearate to obtain the product.

Embodiment 3

[0054] By weight percentage, weigh 15% of anhydrous calcium sulfoaluminate mineral, 10% of anhydrite, 20% of calcined diatomite, 24.5% of natural pozzolan, and 25% of quartz powder, and grind together until the specific surface area is 450m2 / kg, 0.08 mm square hole sieve with 0.6% remaining; then add 1% rust inhibitor, 0.1% air-entraining agent, 0.5% cellulose, 4% calcium stearate, and mix well to obtain the product.

[0055] Anti-corrosion performance test:

[0056] In order to compare the effects of seawater erosion resistance admixtures on different cements, the test determined the strength, expansion and contraction, erosion resistance, wear resistance of the following several concrete seawater erosion resistance mineral admixtures (HCRA) on different cement varieties under the same amount. The role of performance and work performance. The test is carried out according to GB / T 749-2008 "Test Method for Cement Sulfate Erosion Resistance", GBJ82-1985 "Test Method for Long-t...

[technical field]

[0001] The invention relates to a concrete admixture, in particular to a concrete seawater erosion-resistant mineral admixture and a preparation method thereof. [Background technique]

[0002] In recent years, with the vigorous development of marine resource exploration and mining, the volume of seaborne cargo has continued to increase, and various marine engineering projects such as offshore oil drilling platforms, ports, wharves, cross-sea tunnels and bridges have increased rapidly. The demand for admixtures is increasing year by year, and the marine construction industry urgently needs multifunctional concrete anti-corrosion admixture products.

[0003] The traditional common method of preparing seawater erosion-resistant concrete is to add rust inhibitor, micro-expansion agent, air-entraining agent, water reducing agent, etc. when preparing concrete. Due to the compatibility problems of different types of admixtures, it may lead to deterioration of conc...

Examples

Embodiment 1

[0050] According to weight percentage, weigh 30% of anhydrous calcium sulfoaluminate mineral, 20% of anhydrite, 20% of calcined diatomite, 14% of natural pozzolan, 10% of quartz powder, and grind together until the specific surface area is 410m 2 / kg, 1.2% remaining on 0.08mm square hole sieve; then mixed with 3% of rust inhibitor, 0.1% of air-entraining agent, 0.4% of cellulose, and 2.5% of calcium stearate to obtain the product.

Embodiment 2

[0052] According to weight percentage, weigh 20% of anhydrous calcium sulfoaluminate mineral, 15% of anhydrite, 30% of calcined diatomite, 17.85% of natural pozzolan, and 15% of quartz powder, and grind them together until the specific surface area is 350m 2 / kg, 0.08mm square hole sieve remaining 1.8%; then mixed with 1% of rust inhibitor, 0.05% of air-entraining agent, 0.1% of cellulose, and 1% of calcium stearate to obtain the product.

Embodiment 3

[0054] By weight percentage, weigh 15% of anhydrous calcium sulfoaluminate mineral, 10% of anhydrite, 20% of calcined diatomite, 24.5% of natural pozzolan, and 25% of quartz powder, and grind together until the specific surface area is 450m2 / kg, 0.08 mm square hole sieve with 0.6% remaining; then add 1% rust inhibitor, 0.1% air-entraining agent, 0.5% cellulose, 4% calcium stearate, and mix well to obtain the product.

[0055] Anti-corrosion performance test:

[0056] In order to compare the effects of seawater erosion resistance admixtures on different cements, the test determined the strength, expansion and contraction, erosion resistance, wear resistance of the following several concrete seawater erosion resistance mineral admixtures (HCRA) on different cement varieties under the same amount. The role of performance and work performance. The test is carried out according to GB / T 749-2008 "Test Method for Cement Sulfate Erosion Resistance", GBJ82-1985 "Test Method for Long-t...

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