Thermal and mechanical properties of high-performance fiber-reinforced cementitious composites after exposure to high temperatures. (30th December 2017)

• Record Type: Journal Article
• Authors: Li, Xiuling; Bao, Yi; Wu, Lele; Yan, Qingxi; Ma, Hongyan; Chen, Genda; Zhang, Huining
• Is Part Of: Construction & building materials. Volume 157(2017)
• Page Start: 829
• Page End: 838
• Publication Date: 2017-12-30
• Subjects: High-performance fiber-reinforced cementitious composites (HPFRCCs) -- High temperature -- Thermal properties -- Mechanical properties -- Mix proportions; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.09.125
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Thermal properties of HPFRCCs after exposure to high temperatures. Mechanical properties of HPFRCCs after exposure to high temperatures. Effects of mix proportions on thermal properties of HPFRCCs. Effects of mix proportions on mechanical properties of HPFRCCs. Abstract: This paper investigates residual thermal and mechanical properties of high-performance fiber-reinforced cementitious composites (HPFRCCs) proportioned with high-volume fly ash after exposure to 200, 400, 600, and 800 °C. The investigated thermal and mechanical properties include the thermal conductivity, specific heat, compressive strength, tensile strength, tensile ductility, and density. The effects of five mix proportioning variables on the material properties are evaluated, which include the water-to-binder ratio (0.24–0.36 by mass), sand-to-binder ratio (0.36–0.66 by mass), fly ash content (60%–75% by mass), polyvinyl alcohol fiber content (1.5%–2.2% by volume), and superplasticizer content (0.10%–0.15% by mass). Experimental results reveal significant dependence of the residual thermal and mechanical properties on temperature and the mix proportion, which can be attributed to a series of chemical and physical reactions that occur at elevated temperatures. This study can facilitate optimization of mix proportions of HPFRCCs for enhanced thermal and mechanical performance in fire or high temperature applications.