Influence of high temperature on the compression and bending properties of AASCM

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2023-09-05 DOI:10.1680/jmacr.23.00029

Xueyuan Lv, Hao Cheng, Pang Chen, Yonggan Li, Zhiyong Wang

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引用次数: 1

Abstract

Alkali-activated slag cementitious materials (AASCM) with manufactured sand can effectively utilise industrial waste slag and reduce river sand consumption. Steel fibres can effectively improve the mechanical properties of AASCM. Therefore, this study investigated the influence of steel fibre and aggregate type on the compression and bending properties of AASCM after high-temperature treatment. The results showed that the mass loss rate, compressive strength, and flexural strength loss rate of AASCM with manufactured sand were higher than those with natural river sand at different temperatures. Steel fibres can increase the mass loss rate of AASCM; however, the influence of the steel fibre content on the mass loss of AASCM was not apparent. When the temperature was lower than 600°C, the compressive and flexural strength of AASCM effectively was increased by steel fibre, while for temperatures higher than 800°C, the mechanical properties of AASCM did not improved owing to the oxidation failure of steel fibre. Microstructure analysis showed that the number of microcracks in the AASCM increased owing to the high silicon content of the manufactured sand, and the bond property between the steel fibres and cementitious materials decreased with an increase in temperature.

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高温对AASCM压缩和弯曲性能的影响

采用人工砂配制的碱矿渣胶凝材料可以有效利用工业废渣，降低河砂消耗。钢纤维可以有效地改善AASCM的力学性能。因此，本研究考察了钢纤维和骨料类型对AASCM高温处理后压缩和弯曲性能的影响。结果表明，在不同温度下，人工砂的AASCM的质量损失率、抗压强度和抗弯强度损失率均高于天然河砂。钢纤维可以增加AASCM的质量损失率；然而，钢纤维含量对AASCM质量损失的影响并不明显。当温度低于600°C时，钢纤维有效地提高了AASCM的抗压强度和抗弯强度，而在温度高于800°C的情况下，由于钢纤维的氧化破坏，AASCM的力学性能没有改善。微观结构分析表明，由于人工砂中硅含量高，AASCM中的微裂纹数量增加，钢纤维与胶凝材料之间的粘结性能随着温度的升高而降低。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.