Sulfate-erosion-resistant concrete as well as proportioning optimization method and application thereof

Abstract

The invention belongs to the field of engineering, and relates to sulfate corrosion prevention concrete and application thereof, in particular to sulfate corrosion prevention concrete and a test method and application thereof. The concrete is formed by mixing and stirring a base material, aggregate, an admixture, an external additive and water, wherein the concrete comprises the following components in parts by mass: 17.4-17.5 parts of ordinary Portland cement with the strength grade of 42.5 as the base material; the aggregate comprises a fine aggregate and a coarse aggregate, the coarse aggregate is 38.9 parts of basalt with the particle size of 5-10 mm, and the fine aggregate is 33.1-33.2 parts of basalt medium sand; the admixture is silicon powder or 1.9-1.95 parts of fly ash with the activity index greater than 80%. Compared with the prior art, the invention has the beneficial effects that the whole process of sulfate type erosion is reproduced and the cause of erosion is analyzed by simulating the actual proportioning test of engineering and combining the special corrosion environment of the weak-permeability gypsum rock stratum; therefore, the theoretical basis is provided for selection and composition design of anti-corrosion concrete materials, and components and proportions of samples in the test are set according to the current situation of engineering and erosion characteristics.

Description

technical field [0001] The invention relates to an anti-sulfate erosion concrete and an application thereof in the engineering field, in particular to an anti-sulfate erosion concrete and a ratio optimization method and application thereof. Background technique [0002] Sulphate-type sulfate attack is a special concrete service environment. In this environment, the tunnel lining using ordinary concrete will be attacked by sulfate in the rock mass. Existing studies have shown that sulfate, water and certain Under temperature conditions, molybdenite-type sulfates attack cement-based concrete (TSA) containing limestone powder or limestone admixtures, destroying its gel properties. The patent number is 201110192758.6, a molybdenite-type sulfate Corrosion inhibitors and their preparation methods have also been explained in the background art, for the sulphate-type sulphate erosion, ordinary anti-corrosion concrete cannot achieve the anti-corrosion effect, and special anti-corrosi...

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Problems solved by technology

[0002] Sulphate-type sulfate attack is a special concrete service environment. In this environment, the tunnel lining using ordinary concrete will be attacked by sulfate in the rock mass. Existing studies have shown that sulfate, water and certain Under temperature conditions, molybdenite-type sulfates attack cement-based concrete (TSA) containing limestone powder or limestone admixtures, destroying its gel properties. The patent number is 201110192758.6, a molybdenite-type sulfate Corrosion inhibitors and their preparation methods have also been explained in the background art, for the sulphate-type sulphate erosion, ordinary anti-corrosion concrete cannot achieve the anti-corrosion effect, and special anti-corrosion concrete can play a role in anti-corrosion, but its ingredients And the process is complicated, the production is cumbersome, and the transportation cost is high, so it is not suitable for actual engineering

[0003] The principle of the inhibitor is to form a wrapping layer on the surface of the concrete to inhibit the corrosion reaction, but the inhibitor is not suitable for tunnel engineering in some special working conditions, mainly because the concrete surface of the tunnel, especially the initial support, is not a smooth surface, so it is relatively Difficulty generating effective wrappers

[0004] In actual engineering, the corrosion of the concrete lining the tunnel is more complicated. One is the external corrosion conditions formed by the surrounding rock mass and groundwater, and the other is the internal water seepage and corrosion of the concrete itself. For example, in the Taihang Mountains area in North my country, it is also There is molarite-type sulfate erosion, but this area is a weakly permeable gypsum rock formation, and the water seepage and corrosion conditions are different from those of ordinary molybdenite-type sulfate erosion. Most of the wollastonite-type sulfate erosion tests are aimed at the formation mechanism and related parameters of wollastonite, and are mostly used for indoor theoretical research and analysis. There is still a lack of scientific and effective ratio research for corrosion in actual engineering environments, and basic research needs to be applied. In engineering practice, relevant proportioning tests and research on the components and contents in the test are also required. Therefore, the basic test needs to be combined with the proportioning optimization test to achieve technical results in practical applications.

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