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基于破损引起的级配变化表征和预测建筑拆除废弃物再生骨料的回弹模量

Characterizing and Predicting the Resilient Modulus of Recycled Aggregates from Building Demolition Waste with Breakage-Induced Gradation Variation.

作者信息

Xiao Yuanjie, Kong Kunfeng, Aminu Umar Faruk, Li Zhiyong, Li Qiang, Zhu Hongwei, Cai Degou

机构信息

School of Civil Engineering, Central South University, Changsha 410075, China.

Ministry of Education Key Laboratory of Engineering Structures of Heavy Haul Railway, Central South University, Changsha 410075, China.

出版信息

Materials (Basel). 2022 Apr 5;15(7):2670. doi: 10.3390/ma15072670.

DOI:10.3390/ma15072670
PMID:35408008
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9000266/
Abstract

Building demolition waste (BDW) has been massively stockpiled due to increasingly rapid urbanization and modernization. The use of recycled BDW as unbound granular base/subbase materials is among the sustainable, cost-effective, and environmentally friendly pavement construction alternatives. The resilient modulus is an important mechanical property of BDW-derived aggregates and mechanistic design input of pavements incorporating BDW. This paper presents the results of a comprehensive laboratory study on the shear strength and resilient modulus characteristics of BDW-derived aggregate materials. A series of monotonic triaxial compression tests and repeated-load triaxial (RLT) tests were conducted with five different gradations representing particle breakage and different stress paths. The apparent cohesion and internal friction angle of recycled BDW aggregates under consolidated drained conditions ranged from 35.3 to 57.5 kPa and from 30.2° to 54.3°, respectively. The apparent cohesion and internal friction angle also increased and decreased non-linearly with the increasing relative content of fine particles, respectively. The resilient modulus of recycled BDW aggregates gradually decreased with increasing relative content of fine particles at the same stress level. Both the deviator stress and confining pressure exhibited significant influences on the resilient modulus, while the effect of confining pressure was more profound. Based on laboratory testing data, a mechanistic-empirical model was developed to predict the resilient modulus of recycled BDW aggregates from gradation and stress-state variables. The findings could be useful for extended engineering applications of BDW in unbound granular pavement base/subbase construction.

摘要

由于城市化和现代化进程日益加快，建筑拆除废物（BDW）已被大量堆放。将回收的BDW用作无结合料粒料基层/底基层材料是可持续、经济高效且环保的路面施工替代方案之一。回弹模量是BDW衍生集料的一项重要力学性能，也是包含BDW的路面力学设计的输入参数。本文介绍了一项关于BDW衍生集料材料抗剪强度和回弹模量特性的综合实验室研究结果。针对代表颗粒破碎和不同应力路径的五种不同级配进行了一系列单调三轴压缩试验和重复加载三轴（RLT）试验。在固结排水条件下，回收BDW集料的表观黏聚力和内摩擦角分别在35.3至57.5 kPa和30.2°至54.3°范围内。表观黏聚力和内摩擦角也分别随着细颗粒相对含量的增加而非线性增加和减小。在相同应力水平下，回收BDW集料的回弹模量随着细颗粒相对含量的增加而逐渐降低。偏应力和围压对回弹模量均有显著影响，而围压的影响更为显著。基于实验室测试数据，建立了一个力学经验模型，用于根据级配和应力状态变量预测回收BDW集料的回弹模量。这些研究结果可能有助于BDW在无结合料粒料路面基层/底基层施工中的工程应用扩展。

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