Tensile performance and cracking characteristics of sustainable textile-reinforced cementitious composites utilizing expanded glass aggregate and fly ash replacement

초록

In this study, sustainable textile-reinforced cementitious composites (TRC) were developed using lightweight expanded glass (EG) aggregates combined with fly ash (FA) as a partial cement replacement. Recycled nylon fibers were incorporated to enhance the cementitious matrix. The tensile performances and cracking characteristics of the developed TRC materials were comprehensively investigated. The key parameters investigated included the lightweight aggregate size, FA replacement content, fabric reinforcement ratio, and volume fraction of additional nylon fibers. The experimental results revealed that utilizing FA replacement content within the range of 20-30% and employing maximum EG aggregate sizes of 0.5 mm and 1.0 mm had a negligible influence on cracking characteristics and the tensile performance of TRC. Conversely, an adverse effect was observed with a 50% FA replacement content and a maximum EG size of 2.0 mm. Moreover, employing a higher fabric reinforcement ratio and an increased volume fraction of dispersed nylon fibers in the matrix endowed the TRC with favorable tensile performance and cracking characteristics. Eventually, an analytical model simulating the tensile stress-strain responses of TRC composites based on the cracking characteristics and stochastic matrix theory was proposed. The proposed model exhibits a reasonable correlation with the experimental results.

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