| 李静*,姜琳,刘震,王林富.不同种类再生大骨料制作自密实堆积混凝土的实验研究[J].实验力学,2010,25(4):425~430 |
| 不同种类再生大骨料制作自密实堆积混凝土的实验研究 |
| Experimental Study of Self-compacting Accumulation Concrete Prepared from Different Recycled Big Aggregate |
| 投稿时间：2010-02-12 修订日期：2010-03-25 |
| DOI： |
| 中文关键词: 自密实堆积混凝土 应力应变曲线 棱柱体抗压强度 峰值应变 |
| 英文关键词:self-compacting fill concrete stress-strain curve prismatic compressive strength peak strain |
| 基金项目:青岛经济开发区科技发展计划重点项目(2008223) |
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| 中文摘要: |
| 采用毛石、废弃的混凝土块、废弃的砖块做再生大骨料，按照不同的再生大骨料取代率制作了强度等级为C20，尺寸均为420mm×420mm×1200mm的五组再生骨料自密实堆积混凝土试件，五组试件的再生大骨料分别是：100%的毛石；100%的废弃砖块；100%的废弃混凝土块；废弃混凝土块和废弃砖块各50%；毛石、废弃砖块、废弃混凝土块各占1/3。在500吨压力试验机上，对五组试件分别进行了抗压承载力试验。结果表明，不同的再生大骨料对自密实堆积混凝土的力学性能影响很大，棱柱体抗压强度变化明显。添加废弃混凝土再生大骨料试件的抗压强度较大，而添加废弃砖块试件的抗压强度则有不同程度的降低，单一再生大骨料制作试件的弹性模量高于混掺再生大骨料制作试件的弹性模量。上述结果为今后推广再生大骨料制作自密实堆石混凝土的工程应用提供了实验依据。 |
| 英文摘要: |
| Taking rubbles，discarded concrete blocks and discarded bricks as recycled big aggregate, five groups of recycled aggregate of 420mm×420mm×1200mm self-compacting accumulation concrete blocks with C20 strength grade were prepared with different replacement rates. Recycled big aggregates of above five blocks are 100% rubble；100% discarded bricks; 100% discarded concrete blocks, discarded concrete blocks and discarded bricks each 50%; rubble，discarded bricks，discarded concrete blocks each 1/3, respectively. These blocks were tested on a 500-ton testing machine to get the data of compressive capacity and deformation. Results indicate that different recycled big aggregates have great influence on the mechanical properties of self-compacting accumulation concrete and the prism axial compressive strength change significantly. The compressive strength of block added discarded concrete blocks is larger，and ones added discarded bricks reduce their compressive strength to different extents. Elastic modulus of block made from single recycled big aggregate is larger than that made from mixed with different recycled big aggregates. Above results may provide an experimental basis for popularization and application of using recycled big aggregate to make self-compacting accumulation concrete in the future. |
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