Deterioration law and mechanism of autoclaved aerated concrete under sulfate attack

IF 1.3 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Emerging Materials Research Pub Date : 2023-10-13 DOI:10.1680/jemmr.23.00047

Haoran Wang, Rongsheng Xu, Lu Wei, Jian Lin, Dongping Wu

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Abstract

Autoclaved aerated concrete (AAC) is a lightweight porous material, which is widely used as wall material. However, the performance of AAC under sulfate attack is still unclear. Therefore, this experiment investigated the performance changes of AAC with different bulk densities in sodium sulfate solution. Meanwhile, the influence of B05 grade AAC under erosion by sodium sulfate, magnesium sulfate and ammonium sulfate solutions was studied separately, and the degradation degree of its performance in different concentrations of sodium sulfate solution was analyzed. Mass change, relative dynamic modulus of elasticity (E _rd) and compressive strength, mineral phase and micromorphologies were investigated. The results revealed that E _rd decreased more obviously with a higher bulk density class, but the variety of the compressive strength was inversed. Moreover, the performances of AAC samples degraded more significantly while they were exposed to sodium sulfate solution. With an increase in sulfate solution concentration, the performance of AAC deteriorated more seriously.

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硫酸盐侵蚀下蒸压加气混凝土劣化规律及机理

蒸压加气混凝土(AAC)是一种轻质多孔材料，被广泛用作墙体材料。然而，硫酸盐侵蚀下AAC的性能尚不清楚。因此，本实验研究了不同容重的AAC在硫酸钠溶液中的性能变化。同时，分别研究了硫酸钠、硫酸镁和硫酸铵溶液对B05级AAC的侵蚀影响，并分析了其性能在不同浓度硫酸钠溶液中的降解程度。研究了质量变化、相对动态弹性模量(E rd)和抗压强度、矿物相和微观形貌。结果表明，随着容重等级的增加，E - rd的降低更为明显，而抗压强度的变化则相反。此外，AAC样品暴露于硫酸钠溶液时，其性能下降更为明显。随着硫酸盐溶液浓度的增加，AAC的性能恶化更为严重。

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来源期刊

Emerging Materials Research MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

9.10%

发文量

期刊介绍： Materials Research is constantly evolving and correlations between process, structure, properties and performance which are application specific require expert understanding at the macro-, micro- and nano-scale. The ability to intelligently manipulate material properties and tailor them for desired applications is of constant interest and challenge within universities, national labs and industry.