Anti-sulphates corrosive test method and test device of cement concrete

Abstract

The invention relates to a method for testing the sulphate erosion resistance of cement concrete and a device thereof. The method utilizes a principle of electroosmosis pulse technology, promotes the diffusion of sulphate ions to the inside of the cement concrete and rapidly detects the performance of sulphate erosion resistance of the cement concrete; and the capacity for resisting sulphate erosion of the cement concrete is judged according to the quality change and the strength loss value of the cement concrete. In the testing method, a concrete test piece is placed into a sulphate environment; and according to the condition of reaction between the sulphate ions and a hydration product of the concrete test piece under the action of pulse voltage, the performance of sulphate erosion resistance of the concrete is rapidly judged. The testing method has small testing strength and short period; the whole testing process is completed by only 7 days; and a testing result is rather accurateand can really reflect the situation of the concrete eroded in the sulphate environment.

Description

technical field [0001] The invention relates to the field of building material testing, in particular to a testing method and testing device for testing the sulfate corrosion resistance of cement concrete. Background technique [0002] Cement concrete is the most widely used structural material in the world. Due to its internal structure and hydration products, cement concrete is susceptible to chemical erosion by harmful components in air, groundwater and soil, resulting in a decrease in its strength, volume deformation and service life. Among the many types of chemical attack, sulfate corrosion is an important factor affecting the durability of concrete. Sulfate ions contained in soil and groundwater penetrate into concrete and react with cement hydration products, causing concrete damage such as swelling, cracking, and spalling, so that structural concrete will prematurely fail to reach its expected design service life. Destruction occurs. Therefore, it is necessary to...

AI Technical Summary

Problems solved by technology

The obvious disadvantage of this method is that the labor intensity of the testers is high. At the same time, the key point is that after 50 dry-wet cycles, although the strength of the concrete will be lost, for some concrete, the quality will increase instead of decrease, which cannot be true. Reflecting the corrosion status of concrete in sulfate environment

The key point is that even if there is no sulfate environment, the thermal shock caused by the dry-wet cycle of concrete at 80°C will cause concrete damage, so it is difficult to truly determine the sulfate corrosion resistance of concrete

Images