A sulfate-resistant concrete

Abstract

The invention discloses a sulfate-resistant concrete, which belongs to the technical field of concrete. The main points of the technical scheme are, in parts by weight, 260-330 parts of cement, 160-180 parts of water, 60-100 parts of fly ash, and 90 parts of mineral powder. ‑120 parts, 720‑870 parts of fine aggregate, 900‑1200 parts of coarse aggregate, 7‑11 parts of calcined hydrotalcite powder, 1‑2 parts of sodium benzoate, 1‑2 parts of barium nitrate, 10‑20 parts of nano silicon dioxide Parts, 7‑13 parts of polycarboxylate superplasticizer, calcined hydrotalcite powder is obtained by calcining hydrotalcite at 500°C for 2 hours, to improve the sulfate corrosion resistance of concrete.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a sulfate corrosion-resistant concrete. Background technique [0002] Sulfate attack is an important factor causing insufficient durability of concrete. Its action mechanism is complex and destructive. Improving the sulfate attack resistance of concrete has great social and economic benefits. The damage speed and damage degree of sulfate attack mainly depend on the sulfate content in the environment, the impermeability of concrete and the corrosion mechanism. At present, the main method to improve the sulfate corrosion resistance of concrete is to add mineral admixtures, which have three main functions: one is to replace a part of cement and directly reduce the tricalcium silicate (C 3 A) content; the second is fly ash, slag, etc. and Ca(OH) in concrete 2 A secondary hydration reaction occurs, thereby reducing the Ca(OH) in the concrete 2 content, while C 3 A and Ca(OH) 2 Both are re...

AI Technical Summary

Problems solved by technology

Studies have shown that the cement test block mixed with fly ash will generate more ettringite and gypsum in the water evaporation area, which will eventually lead to the destruction of the test block in the water evaporation area

[0005] Generally speaking, in the research system of concrete durability, the research on sulfate attack is relatively lagging behind, and the corresponding measures are insufficient. It is necessary to study a new type of modified material, so that this material can not only improve the sulfate attack resistance of concrete performance, but also improve the durability of concrete as a whole