Mechanical and self-healing behavior of low carbon engineered cementitious composites reinforced with PP-fibers
Mechanical and self-healing behavior of low carbon engineered cementitious composites reinforced with PP-fibers
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DOI：
10.1016/j.conbuildmat.2020.119805
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发表时间：
2020-10
影响因子：
7.4
通讯作者：
He-hua Zhu;Duo Zhang;Tianyu Wang;Hao-liang Wu;V. Li
中科院分区：
文献类型：
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作者：
He-hua Zhu;Duo Zhang;Tianyu Wang;Hao-liang Wu;V. Li
虽然工程水泥基复合材料（ECC）的抗拉延展性和上级耐久性已被证明，但相对高的能量和碳强度以及高的材料成本对更广泛的ECC应用提出了潜在的障碍。本研究的目的是开发一种更具可持续性和成本效益的ECC。分别用石灰石煅烧粘土水泥（LC 3）和聚丙烯（PP）纤维代替普通波特兰水泥（OPC）和常规ECC中常用的PVA纤维。研究了三种水胶比（0.3、0.2、0.16）下ECC的抗压强度、拉伸应力-应变关系和微裂纹自愈合行为。当加载到1%的拉伸应变时，新型LC 3-PP-ECC显示出大于6%的拉伸应变能力和小于82 μm的固有紧密裂纹宽度。此外，LC 3-PP-ECC证明了复合材料拉伸延展性和极限拉伸强度通过自愈合的有效恢复。与传统的OPC和PVA纤维ECC相比，LC 3-PP-ECC的材料成本、隐含能量和碳足迹分别降低了61%、45%和48%。优越的上级机械性能和耐久性以及低环境影响和材料生产成本使LC 3-PP-ECC成为结构和非结构应用的可持续材料。
While the ultrahigh tensile ductility and superior durability of Engineered Cementitious Composites (ECC) have been demonstrated, the relatively high energy and carbon intensity, as well as high material cost present potential impediments to broader ECC applications. The objective of this research is to develop a more sustainable and cost-effective ECC. The ordinary Portland cement (OPC) and the commonly used PVA fiber in conventional ECC were replaced by limestone calcined clay cement (LC3) and polypropylene (PP) fiber, respectively. The ECC compressive strength, tensile stress-strain relationship, and microcrack self-healing behavior were studied at three water to binder ratios (0.3, 0.2, 0.16). The novel LC3-PP-ECC showed a tensile strain capacity of greater than 6% and an intrinsically tight crack width below 82 μm when loaded to 1% tensile strain. Further, the LC3-PP-ECC demonstrated efficient recovery of the composite tensile ductility and ultimate tensile strength through self-healing. Compared to typical ECC made with OPC and PVA fiber, the material cost, embodied energy and carbon footprint of LC3-PP-ECC are reduced by 61%, 45%, and 48%, respectively. The superior mechanical properties and durability combined with the low environmental impact and cost for material production promote LC3-PP-ECC as a sustainable material for structural and non-structural applications.