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Coupled temperature and moisture effects on the tensile behavior of strain hardening cementitious composites (SHCC) reinforced with PVA fibers
Authors:Andrielli Morais de Oliveira  Flávio de Andrade Silva  Eduardo de Moraes Rego Fairbairn  Romildo Dias Toledo Filho
Affiliation:1.Department of Civil Engineering,Universidade Federal de Goiás (UFG),Goiania,Brazil;2.Department of Civil and Environmental Engineering,Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio),Rio de Janeiro,Brazil;3.Department of Civil Engineering,COPPE, Universidade Federal do Rio de Janeiro,Rio de Janeiro,Brazil
Abstract:This paper reports the experimental findings on the tensile behavior of strain-hardening cement-based composites (SHCC). The composites were subjected to the combined effects of elevated temperatures and internal moisture condition. Uniaxial tensile tests on dumbbell-shaped SHCC specimens with in situ temperature control were performed at 22, 60 and 100 °C. In addition, the effect of the internal humidity of SHCC (95, 50, 20 and 0%) coupled to the elevated temperatures was investigated. It was shown that the tensile strength decreases and the strain capacity increases with an increase in temperature. The influence of the internal moisture conditions was more significant in high temperatures. The strain capacity reduced significantly with a decrease in the humidity level. The crack pattern of the SHCC specimens was determined. Furthermore, single fiber pullout tests were performed under the considered high temperatures condition. Finally, the results are discussed based on the thermogravimetry analysis of the PVA fiber, alterations on its microstructure and surface coating.
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