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Title: Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures
Authors: Li, T
Zhang, YM
Dai, JG 
Keywords: Hybrid reinforcement
Alkali-activated slag
Elevated temperature
Flexural behavior
Issue Date: 2017
Publisher: Elsevier
Source: Construction and building materials, 2017, v. 152, p. 651-660 How to cite?
Journal: Construction and building materials 
Abstract: This study investigates the effects of high temperatures and exposure duration on the flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels. Three-point bending tests were conducted after heating specimens to 400 degrees C, 600 degrees C, and 800 degrees C for durations of 1 and 2 h. The effects of thermal exposure on the matrix and the basalt fibers from the panels were investigated with scanning electron microscopy. Element and phase analyses of the matrix were performed after exposure to high temperatures via energy dispersive spectroscopy and X-ray diffraction, respectively. The first crack and peak flexural strength of the specimens not exposed to heat reached 8.9 and 20.5 MPa, respectively. Obvious decreases in flexural performance occurred as temperature and duration increased as a result of the decomposition of the alkali-activated slag mortar (AASM) matrix and the deterioration of the bonding performance between the basalt textile and the matrix. Changing of the Ca/Si ratio, the Al/Si ratio, and the crystalline phase of the AASM matrix indicated that phase transformation occurred after heat exposure at 800 degrees C.
ISSN: 0950-0618
EISSN: 1879-0526
DOI: 10.1016/j.conbuildmat.2017.07.059
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