9 August 2013 Alkali-aggregate reactivity of typical siliceious glass and carbonate rocks in alkali-activated fly ash based geopolymers
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Proceedings Volume 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering; 879313 (2013) https://doi.org/10.1117/12.2032185
Event: Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013, Gold Coast, Australia
Abstract
For exploring the behaviour of alkali-aggregate reactivity (AAR) in alkali-activated geopolymeric materials and assessing the procedures for testing AAR in geopolymers, the expansion behaviour of fly ash based geopolymer mortars with pure silica glass and typical carbonate rocks were studied respectively by curing at various conditions, i.e. 23°C and 38°C with relative humidity over 95%, immersed in 1M NaOH solution at 80°C. Results show that, at various curing conditions, neither harmful ASR nor harmful ACR was observed in geopolymers with the criteria specified for OPC system. However, with the change of curing conditions, the geopolymer binder and reactive aggregates may experience different reaction processes leading to quite different dimensional changes, especially with additional alkalis and elevated temperatures. It suggests that high temperature with additional alkali for accelerating AAR in traditional OPC system may not appropriate for assessing the alkali-aggregate reactivity behaviour in geopolymers designed for normal conditions. On the other hand, it is hopeful to control the dimensional change of geopolymer mortar or concrete by selecting the type of aggregates and the appropriate curing conditions, thus changing the harmful AAR in OPC into beneficial AAR in geopolymers and other alkali-activated cementitious systems.
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Duyou Lu, Duyou Lu, Yongdao Liu, Yongdao Liu, Yanzeng Zheng, Yanzeng Zheng, Zhongzi Xu, Zhongzi Xu, Xiaodong Shen, Xiaodong Shen, } "Alkali-aggregate reactivity of typical siliceious glass and carbonate rocks in alkali-activated fly ash based geopolymers", Proc. SPIE 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 879313 (9 August 2013); doi: 10.1117/12.2032185; https://doi.org/10.1117/12.2032185
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