The heat-treated apricot shell can be utilized as coarse aggregates for producing sustainable bio-based lightweight concrete with good compressive strength but poor tensile strength. In order to improve the tensile properties of apricot shell concrete (ASC), the effects of polypropylene (PP) fibre, glass (G) fibre and basalt (B) fibre at various volume fractions (Vf) (0.25%, 0.5% and 0.75%) on the performance of ASC were investigated. The results indicated that the fibre type had no significant effect on the physical properties of ASC such as slump, density, water absorption and permeable porosity. However, the slump of ASC decreases with an increase in fibre content. The B fibre has a better improvement in mechanical properties than the PP fibre and G fibre thanks to the better elastic modulus and tensile strength. When the Vf was 0.5%, the compressive strength, splitting tensile strength, flexural strength and modulus of elasticity of ASC reinforced with B fibre were increased by 16.7%, 29.1%, 29.2%, and 18.1%, respectively, compared to ASC without any fibres. The magnesium sulfate attack results showed that the incorporation of the B fibre decreased the mass loss and compressive strength of ASC exposed to a MgSO4 solution for 6 months because the fibre arrested the microcracks caused by the expansive stress. It is concluded that the mechanical properties of bio-based ASC and its resistance to magnesium sulfate attack can be significantly improved by incorporating 0.5% B fibre.

中文翻译：

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纤维种类和含量对含热处理杏壳生物基混凝土性能的影响

经热处理的杏壳可用作粗骨料，用于生产具有良好抗压强度但抗拉强度较差的可持续生物基轻质混凝土。为了提高杏壳混凝土（ASC）的拉伸性能，聚丙烯（PP）纤维、玻璃（G）纤维和玄武岩（B）纤维在不同体积分数（Vf）（0.25%、0.5%和0.75 %) 对 ASC 的性能进行了研究。结果表明，纤维类型对ASC的坍落度、密度、吸水率和渗透孔隙率等物理性质没有显着影响。然而，ASC 的坍落度随着纤维含量的增加而降低。由于具有更好的弹性模量和拉伸强度，B纤维比PP纤维和G纤维在机械性能方面有更好的改进。当 Vf 为 0.5% 时，与不含任何纤维的 ASC 相比，B 纤维增强的 ASC 的压缩强度、劈裂强度、弯曲强度和弹性模量分别提高了 16.7%、29.1%、29.2% 和 18.1%。硫酸镁侵蚀结果表明，B 纤维的掺入降低了 ASC 暴露于 MgSO4 溶液 6 个月的质量损失和压缩强度，因为纤维阻止了由膨胀应力引起的微裂纹。结论是，通过加入 0.5% B 纤维，生物基 ASC 的机械性能及其对硫酸镁侵蚀的抵抗力可以显着提高。与没有任何纤维的 ASC 相比。硫酸镁侵蚀结果表明，B 纤维的掺入降低了 ASC 暴露于 MgSO4 溶液 6 个月的质量损失和压缩强度，因为纤维阻止了由膨胀应力引起的微裂纹。结论是，通过加入 0.5% B 纤维，生物基 ASC 的机械性能及其对硫酸镁侵蚀的抵抗力可以显着提高。与没有任何纤维的 ASC 相比。硫酸镁侵蚀结果表明，B 纤维的掺入降低了 ASC 暴露于 MgSO4 溶液 6 个月的质量损失和压缩强度，因为纤维阻止了由膨胀应力引起的微裂纹。结论是，通过加入 0.5% B 纤维，生物基 ASC 的机械性能及其对硫酸镁侵蚀的抵抗力可以显着提高。