The compressive stress–strain curves of reactive powder concrete (RPC) reinforced with basalt fibres (BFs) were experimentally studied. The length and volume content of BFs were considered as the influencing parameters. A total of 15 groups of cementitious composite specimens were investigated. The workability, failure mode, peak stress, corresponding strain at peak stress, elastic modulus, toughness index and stress–strain curve of the cement-based composites were carefully explained. The results indicated that an increase in fibre volume content gradually decreased the workability of the specimen. Specimens reinforced with 6 mm and 12 mm long BFs showed different failure modes from those reinforced with 18 mm BFs. The former had better integrity, while the latter had poor integrity. The shorter BFs (6 mm and 12 mm) improved the performance under peak stress and the compressive toughness of the RPC. For the 18 mm long BFs, with increasing fibre content, the peak stress and the corresponding strain decreased and the toughness index also decreased gradually. The fibre length/content had a small effect on the elastic modulus of the RPC but, with increasing fibre volume content, the peak secant modulus of the specimens decreased gradually. Considering the results of four groups of models, a group of predictive models was selected to express the complete stress–strain curves of RPCs reinforced with BFs.

中文翻译：

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玄武岩纤维增强反应性粉末混凝土的完整应力-应变曲线

实验研究了玄武岩纤维 (BFs) 增强的反应性粉末混凝土 (RPC) 的压缩应力-应变曲线。BF的长度和体积含量被认为是影响参数。共研究了15组水泥复合材料试件。详细阐述了水泥基复合材料的和易性、失效模式、峰值应力、峰值应力对应应变、弹性模量、韧性指数和应力-应变曲线。结果表明，纤维体积含量的增加逐渐降低了试样的可加工性。用 6 毫米和 12 毫米长的高炉加固的试样显示出与用 18 毫米高炉加固的不同的失效模式。前者的完整性较好，而后者的完整性较差。较短的 BF（6 毫米和 12 毫米）提高了 RPC 在峰值应力下的性能和抗压韧性。对于18 mm长的BF，随着纤维含量的增加，峰值应力和相应的应变逐渐减小，韧性指数也逐渐降低。纤维长度/含量对RPC的弹性模量影响很小，但随着纤维体积含量的增加，试样的峰值正割模量逐渐减小。考虑到四组模型的结果，选择一组预测模型来表达BFs增强的RPCs的完整应力-应变曲线。纤维长度/含量对RPC的弹性模量影响很小，但随着纤维体积含量的增加，试样的峰值正割模量逐渐减小。考虑到四组模型的结果，选择一组预测模型来表达BFs增强的RPCs的完整应力-应变曲线。纤维长度/含量对RPC的弹性模量影响很小，但随着纤维体积含量的增加，试样的峰值正割模量逐渐减小。考虑到四组模型的结果，选择一组预测模型来表达BFs增强的RPCs的完整应力-应变曲线。