首页|建筑固废再生骨料单颗粒压碎试验与近场动力学模拟

建筑固废再生骨料单颗粒压碎试验与近场动力学模拟

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  • 国家科技期刊平台
  • NETL
  • NSTL
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建筑固废再生骨料颗粒形状复杂、强度低且极易发生破碎.为了准确了解建筑固废再生骨料颗粒在单轴压缩荷载作用下的颗粒破碎行为,开展再生骨料单颗粒压碎试验,并在准确表征再生骨料颗粒三维形貌的基础上对单颗粒破碎进行近场动力学模拟.研究结果表明:碎石、红砖和砂浆这3种再生骨料的单颗粒破碎强度均较好地满足Weibull分布,但离散性较大,不同粒径组的平均Weibull模量在1.3～1.8之间,其中,砂浆与红砖颗粒的破碎强度远低于碎石颗粒的破碎强度,且离散性比碎石颗粒的大;借助近场动力学理论可以有效地模拟真实形状再生骨料颗粒在单轴压缩荷载作用下的破碎过程;对于不同形状种类的再生骨料颗粒破碎强度,块状颗粒的最大,盘状颗粒的次之,而条状颗粒的最小;颗粒材料与形状对颗粒破碎后所形成的碎片的数量与形状具有明显的影响,对于不同材料再生骨料颗粒,碎石颗粒产生碎片较少,而红砖颗粒产生碎片分布更加均匀;对于不同形状再生骨料颗粒,条状颗粒倾向于沿颗粒中、短轴平面断裂为少量碎片,块状与盘状颗粒则倾向于产生交叉裂纹,最终破碎并产生较多碎片.
Single particle crush test and peridynamic simulation of recycled aggregates from building demolition waste
Building demolition waste(BDW)has irregular particle morphology,low strength and high susceptibility to breakage.To accurately understand the single particle crushing behavior of BDW particles under uniaxial compressive loading,a series of single particle crushing tests were conducted.Corresponding peridynmic simulations were performed based on three-dimensional shape characterization of BDW particles.The results show that the single-particle crush strength of three different types of recycled aggregates can follow the Weibull distribution but exhibit high dispersion.The average Weibull modulus for different particle size groups ranges from 1.3 to 1.8.The cement mortar and red brick particles have significantly lower crush strength with higher dispersion compared to gravel particles.The grain crush behavior of BDW particles with realistic shape can be effectively simulated by peridynamics.For the crush strength of recycled aggregate particles with different shape features,block-like particles have the highest crush strength,followed by disk-like particles,while blade-like particles have the lowest crush strength.In addition,the particle mineralogy and shape have profound influences on the number and shape of crushed fragments.For the recycled aggregate particles of different material constituents,gravel particles crush into fewer fragments,while red brick particles produce more uniform distribution of fragments.For recycled aggregate particles with different shape features,blade-like particles tend to fracture into a small number of fragments along the short and medium axis planes,while block-and disk-like particles tend to cross-crack and eventually break up into a larger number of fragments.

building demolition waste(BDW)particle crushingWeibull distributionnumerical simulationperidynamics

肖源杰、侯可、华文俊、王小明、杨涛、王萌、陈宇亮、周震、孟凡威

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中南大学土木工程学院,湖南长沙,410075

中南大学重载铁路工程结构教育部重点实验室,湖南长沙,410075

湖南省交通科学研究院有限公司,湖南长沙,410114

广东省交通规划设计研究院集团股份有限公司,广东广州,510507

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建筑固废 颗粒破碎 Weibull分布 数值模拟 近场动力学

国家自然科学基金资助项目国家自然科学基金资助项目国家自然科学基金资助项目国家重点研发计划项目武汉理工大学硅酸盐建筑材料国家重点实验室开放基金资助项目

5217844351878673U19342092019YFC1904704SYSJJ2022-04

2024

10.11817/j.issn.1672-7207.2024.09.013

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(9)
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