Abstract

This paper aims to present compressive stress-strain behaviour and develop relationships for peak stress, strain at peak stress, and material parameter with the modified reinforcing index for analytical modelling of basalt fiber reinforced concretes (BFRC’s) stress-strain curves. For this, three different strengths of BFRCs were developed i.e., normal-strength-BFRC, medium-strength-BFRC and high-strength-BFRC, each strength of BFRCs contains 0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% of basalt fibers (BFs). The effect of BFs on mechanical properties, compressive stress-strain behaviour of the BFRCs mixes were studied experimentally. The energy absorption capacity, peak stress, and strain at peak stress of BFRCs have also been studied analytically. Scanning electron microscope analysis was performed to examine microstructural characteristics of BFRCs. The test results indicated that the maximum compressive, flexural, and split tensile strengths and better stress-strain behaviour exhibited at the addition of 0.3% of BFs in all three strengths of BFRCs. Using developed relationships, analytically modelled stress-strain curves closely represented the realistic stress-strain behaviour of BFRCs and fit well with the experimental stress-strain curves. In addition, in literature, the proposed expressions between the material parameter and reinforcing index for analytical modelling of steel FRC's stress-strain curves could not accurately predict the experimental stress-strain curves of BFRCs.

摘要

本文旨在介绍压缩应力-应变行为，并建立峰值应力、峰值应力下的应变和材料参数与修正的增强指数之间的关系，用于玄武岩纤维增强混凝土 (BFRC) 应力-应变曲线的分析建模。为此，开发了三种不同强度的BFRC，即普通强度BFRC、中强度BFRC和高强度BFRC，每种强度的BFRC包含0%、0.1%、0.2%、0.3%、0.4%、和 0.5% 的玄武岩纤维 (BF)。通过实验研究了 BFs 对 BFRCs 混合物的力学性能、压缩应力-应变行为的影响。还对 BFRC 的能量吸收能力、峰值应力和峰值应力下的应变进行了分析研究。进行扫描电子显微镜分析以检查 BFRC 的微观结构特征。测试结果表明，在所有三种强度的 BFRC 中，添加 0.3% 的 BF 时，表现出最大的压缩、弯曲和劈开拉伸强度以及更好的应力-应变行为。使用开发的关系，分析建模的应力-应变曲线非常接近 BFRC 的真实应力-应变行为，并且与实验应力-应变曲线非常吻合。此外，文献中提出的用于钢 FRC 应力-应变曲线分析建模的材料参数和加固指数之间的表达式无法准确预测 BFRC 的实验应力-应变曲线。使用开发的关系，分析建模的应力-应变曲线非常接近 BFRC 的真实应力-应变行为，并且与实验应力-应变曲线非常吻合。此外，文献中提出的用于钢 FRC 应力-应变曲线分析建模的材料参数和加固指数之间的表达式无法准确预测 BFRC 的实验应力-应变曲线。使用开发的关系，分析建模的应力-应变曲线非常接近 BFRC 的真实应力-应变行为，并且与实验应力-应变曲线非常吻合。此外，文献中提出的用于钢 FRC 应力-应变曲线分析建模的材料参数和加固指数之间的表达式无法准确预测 BFRC 的实验应力-应变曲线。