Abstract
Experimental investigations were carried out to determine the mechanical properties of fine concrete with short AR-glass fibers including the effects of fiber content and length. Also, the basalt fiber textile reinforced concrete (BTRC) sheets with short AR-glass fibers were tested under four-point bending, and the effects of the number of fiber textile layer and fiber length on the flexure properties were emphatically analyzed. The results show that the mechanical properties of fine concrete with fibers were mainly related to fiber length and content, the mechanical properties of fibers reinforced fine concrete increase with the increase of fiber length, and the comprehensive mechanical properties of fine concrete materials are the best when the AR-glass fiber content is about 5%. The flexure performance tests of BTRC sheets show that the strength and the deformation capacity of sheets increase with the increase of the number of fiber textile layers. The short AR-glass fibers can also effectively improve the strength and deformation capacity of BTRC sheets, and the cracking load and ultimate displacement can be respectively increased by up to 106% and 268% compared with BTRC sheets without short fibers. For the multi-fiber compound reinforced concrete sheets, the fiber textile can provide tension in the desired direction, and the short AR-glass fibers can improve the cracking resistance and toughness of sheets.
Highlights
Textile-reinforced concrete (TRC) is a cement-based composite material with high-performance two-directional or multi-directional continuous fiber textiles as reinforcement and with inorganic cementitious material as a matrix, which exhibits features including good tensile properties, directional mechanical performance, and easy casting molding (Hegger et al, 2006; Yin et al, 2014)
The results showed that the first-crack stress is increased due to the addition of short dispersed fibers, and the tensile strength of GTRC samples is improved with the addition of short fibers
Based on the previous research findings, this paper focused on using basalt textile to reinforce fine-grained concrete, while short AR-glass fibers were added to the basalt fiber textile reinforced concrete (BTRC) matrix to achieve improved load-bearing capacity and optimized cracking patterns
Summary
Textile-reinforced concrete (TRC) is a cement-based composite material with high-performance two-directional or multi-directional continuous fiber textiles as reinforcement and with inorganic cementitious material as a matrix, which exhibits features including good tensile properties, directional mechanical performance, and easy casting molding (Hegger et al, 2006; Yin et al, 2014). Deng et al (2020) studied the impact of the textile reinforcing ratio and the volume content of short PVA fibers on the tensile mechanical behavior of CTRC, and the experimental results indicated that the PVA fibers could significantly improve the bond properties between carbon textile and matrix, as well as increase the tensile strength and strain. The hybridization of glass textiles with carbon fiber and its effects on the tensile properties of the composites have been investigated (Hinzen and Brameshuber, 2009; Barhum and Mechtcherine, 2013b) These studies indicated that the cracking resistance and toughness of the matrix are improved through the application of short fibers. To consider the effects of both the content and the length of AR-glass fibers on the mechanical properties of cement-based materials (i.e., fine-grained concrete) in this study.
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