| 摘要: |
| 采用以卵石为粗骨料的原生混凝土作为再生混凝土来源，通过破碎、筛分获取再生卵石粗骨料，并用其全部或部分取代天然卵石来配制再生混凝土.以再生卵石粗骨料取代率为变化参数，设计99个试件，分别进行立方体抗压强度、棱柱体抗压强度、抗折强度、弹性模量和泊松比等力学性能试验.观察了试件的破坏形态，获取其受力破坏全过程的应力应变曲线及峰值应力、峰值应变、弹性模量和泊松比等特征参数，并提出了再生卵石骨料混凝土各项强度指标之间的换算关系公式.结果表明：再生卵石骨料混凝土的各项强度指标与天然卵石骨料混凝土相比均有略微增大之势；不同取代率下，再生卵石骨料混凝土应力应变曲线下降段比天然卵石骨料混凝土陡峭；再生卵石骨料混凝土弹性模量均小于天然卵石骨料混凝土，泊松比与天然卵石骨料混凝土接近. |
| 关键词: 再生混凝土 卵石骨料 强度特征 强度换算 |
| DOI：103969/j.issn1007 9629201403017 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51268004)；“八桂学者”建设工程专项经费资助项目；广西科技攻关资助项目(桂科攻12118023 3)；广西自然科学基金资助项目(2012GXNSFAA053203,2013GXNSFDA019025)；广西理工科学实验中心重点项目(LGZX201102) |
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| Mechanical Properties of Recycled Pebble Aggregate Concrete |
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CHEN Zongping1, ZHOU Chunheng1, CHEN Yuliang1, HUANG Jing1, XUE Jianyang2
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1.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;2.Key Laboratory of DisasterPrevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China
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| Abstract: |
| Primary concrete with pebble coarse aggregate was used as the source of recycled pebble, all or part of natural pebble was replaced with recycled pebble to prepare concrete. 99 specimens were designed with different replacement rate. The prism compressive strength, cube compressive strength, flexural strength, elastic modulus and Poissons ratios of specimens were tested. The failure pattern, stress strain curves, peak stress, peak strain, elastic modulus and Poissons ratios of specimens were determined. Based on the test data, the conversion relationship of various strength indexes was proposed. The research results show that comparing with natural pebble concrete, the strength of recycled pebble concrete slightly increases; in different replacement ratio, the stress strain curves of recycled pebble concrete are steeper than those of natural pebble concrete at descending section; the elastic modulus, deformation performance are lower than those of natural pebble concrete, but Poissons ratio is close. |
| Key words: recycled aggregate concrete pebble coarse aggregate strength characteristics strength conversion method |
