Method for evaluating acid tolerance of concrete

Abstract

The invention relates to a method for evaluating acid tolerance of concrete. The method includes: 1), preparing concrete strength testing pieces and acidization depth testing pieces; 2), maintaining the testing pieces in a standard maintaining chamber for 26d, dry-maintaining the testing pieces for 2d, disposing the testing pieces into mixed acid liquid for soaking, taking out the testing pieces for drying for 2d after being soaked for 5d each time, measuring compressive strength X (t) of a group of the concrete strength testing pieces and width b (t) of un-corroded parts of a group of the acidization depth testing pieces after four circulating periods of soaking-drying; 3), calculating concrete acid-corrosion-resistant coefficient Q according to the obtained compressive strength X (t); 4), calculating concrete acidization depth d according to the width b (t) of the un-corroded parts; 5), dividing concrete corrosion-resistant grades into I, II, III and IV according to data conditions of Q and d, and evaluating acid-corrosion-resistant grade, acid resistance and suitable environment acting grade of concrete according to the concrete corrosion-resistant grades.

Description

technical field [0001] The invention relates to a method for evaluating the acid-resistant durability of concrete, which belongs to the technical field of engineering materials. Background technique [0002] In recent years, due to the rapid development of my country's economy, the massive combustion of fossil fuels and the massive discharge of industrial waste gas, the acid rain situation in my country has become more and more serious. Acid rain can cause direct damage to exposed concrete structures. In addition, the acidic water formed after acid rain falls It can also cause damage to underground structures. At the same time, a large amount of industrial acid wastewater and the discharge of sulfuric acid-type acid wastewater during the mining process of pyrite-based mines will pollute surface water and groundwater to make them acidic, and damage sewage treatment pools, underground pipes, tunnels and bridge piles Foundation and other underground concrete structures. Theref...

AI Technical Summary

Problems solved by technology

At the same time, SO in acid rain 4 2- Diffuse into the concrete and interact with free Ca 2+ The reaction generates gypsum and crystallizes to cause the internal volume to expand, resulting in a large internal stress, causing expansion damage to the concrete

[0005] So far, there is no relevant regulation to propose a test method for concrete acid corrosion resistance, and there is no systematic index system for evaluating the acid durability of concrete.

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