A kind of anti-sulfate corrosion concrete and its proportion optimization method and application

Abstract

The invention relates to an anti-sulfate erosion concrete and its application in the field of engineering, and specifically relates to an anti-sulfate erosion concrete and its test method and application. The concrete is composed of base material, aggregate, admixture, external additives and water Mixed and stirred, the components and mass parts of the concrete are as follows: the base material is 17.4-17.5 parts of Portland cement with a strength grade of 42.5; the aggregate includes fine aggregate and coarse aggregate, and the The coarse aggregate is 38.9 parts of basalt with a particle size of 5-10mm, and the fine aggregate is 33.1-33.2 parts of basalt medium sand; the admixture is silica fume or fly ash with an activity index greater than 80% 1.9-1.95 Compared with the prior art, the beneficial effect of the present invention is: simulate the actual proportioning test of the project, combine the special corrosion environment of the impermeable gypsum formation, reproduce the whole process of sulfate type erosion and analyze the cause of erosion, for The selection of anti-corrosion concrete materials and the composition design provide a theoretical basis. The composition and proportion of the samples in the test are set in combination with the current engineering situation 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...

AI Technical Summary

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.

Images