Mechanical Performance and Constitutive Model Analysis of Concrete Using PE Fiber-Strengthened Recycled Coarse Aggregate.
Mechanical Performance and Constitutive Model Analysis of Concrete Using PE Fiber-Strengthened Recycled Coarse Aggregate.
复制标题
PE纤维增强再生粗骨料混凝土力学性能及本构模型分析
DOI：
10.3390/polym14193964
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发表时间：
2022-09-22
期刊：
影响因子：
5
通讯作者：
Hu B
中科院分区：
文献类型：
--
作者：
Zhou Q;Zhou Y;Guan Z;Xing F;Guo M;Hu B
为促进建筑业的可持续发展，制备了聚乙烯（PE）纤维增强再生粗骨料（SRCA）和海水海砂（SWSS）混凝土。SRCA的使用显著改善了混凝土的力学性能。混凝土柱的强度得到了提高，破坏模式也得到了明显的改变。SWSS的掺入，缓解了淡水和河砂的短缺，略有降低混凝土的机械强度在28和90天，而35%的石灰石煅烧粘土水泥（LC 3）取代水泥克服了这一缺点。混凝土的抗压强度进一步提高，孔结构得到细化。LC 3的引入还促进了Friedel盐的形成，这可以提高SWSS混凝土的氯离子结合能力。分析了耐久性混凝土的应力-应变关系，并将试验结果与常用的本构模型进行了比较。为了有效地描述耐久混凝土的力学性能，提出了预测本构模型。
To promote the sustainable development of the construction industry, concrete incorporating polyethylene (PE) fiber-strengthened recycled coarse aggregate (SRCA) and seawater and sea sand (SWSS) is prepared. The usage of SRCA significantly improves the mechanical performance of concrete. The strength is improved, and the failure mode of concrete cylinders is also remarkably altered. The incorporation of SWSS that alleviates the shortage of freshwater and river sand slightly reduces the mechanical strength of concrete at 28 and 90 days, while the replacement of cement by 35% limestone calcined clay cement (LC3) overcomes this drawback. The compressive strength of concrete is further enhanced, and the pore structure is refined. The introduction of LC3 also promotes the formation of Friedel’s salt, which could improve the chloride binding capacity of concrete using SWSS. Furthermore, the stress-strain relationship of sustainable concrete is analyzed, and the experimental results are compared with the commonly used constitutive models. The predictive constitutive models are proposed to effectively describe the mechanical performance of sustainable concrete.
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