Influence of drying conditions on the contact-hardening behaviours of calcium silicate hydrate powder.pdfVIP

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Influence of drying conditions on the contact-hardening behaviours of calcium silicate hydrate powder.pdf

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Influence of drying conditions on the contact-hardening behaviours of calcium silicate hydrate powder.pdf

Construction and Building Materials 136 (2017) 465–473 Contents lists available at ScienceDirect Construction and Building Materials journal homepage: /locate/conbuildmat In?uence of drying conditions on the contact-hardening behaviours of calcium silicate hydrate powder Shuping Wang a,b,?, Xiaoqin Peng a, Zhilong Tao c, Luping Tang b, Lu Zeng a a College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China b Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg 412 96, Sweden c School of Materials Science and Engineering, Tongji University, Shanghai 200092, China highlights Contact-hardening behaviour of C-S-H treated at varied drying conditions is described. Physical properties and microstructure of C-S-H are related to the drying conditions. Oven-drying at 80 °C is bene?cial to the strength development of the compacts. Moisture content of C-S-H is the key factor to the contact-hardening of the material. article info Article history: Received 28 May 2016 Received in revised form 24 December 2016 Accepted 10 January 2017 Available online 27 January 2017 Keywords: Drying conditions Calcium silicate hydrate Contact-hardening Microstructure Moisture content Particle-particle bonding abstract Contact-hardening is a new type of binding property for amorphous calcium silicate hydrate (C-S-H) with which a hardened specimen can be prepared in a few minutes by compressing C-S-H powders directly. However, the relation between contact-hardening behaviours and the drying conditions of powders is still poorly understood. In this study, the in?uence of air-drying and oven-drying on the physical properties and microstructure of hydrothermally synthesised C-S-H powders were investigated. The results provide further insight into the contact-hardening behaviours of these powders by measuring the bulk density, mechanical strength and water-resistant properties of the compacts. Factors affecting particle