再生混凝土基本力学性能试验及应力应变本构关系
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国家自然科学基金资助项目(50908057);“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);广西理工科学实验中心重点项目(LGZX201102)


Basic Mechanical Properties Test and Stress Strain Constitutive Relationsof Recycled Coarse Aggregate Concrete
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    摘要:

    以设计强度为C30的废弃混凝土为再生粗骨料制备再生混凝土试件,其中66个标准棱柱体试件和33个150mm×150mm×550mm棱柱体试件,分别进行棱柱体抗压强度、抗折强度、弹性模量及泊松比试验,研究了不同再生粗骨料取代率下再生混凝土的基本物理力学性能,提出了再生混凝土应力应变本构方程.结果表明:随着再生粗骨料取代率的增加,标准龄期再生混凝土棱柱体抗压强度略有提高,其应力应变全过程曲线的形状与普通混凝土相似,在曲线的上升段,再生粗骨料混凝土的曲线与天然骨料混凝土基本重合,但在下降段,则再生混凝土的曲线变得更为陡峭;标准龄期的同批次再生混凝土抗折强度与棱柱体抗压强度的比值约为0.12,棱柱体抗压强度与其立方体抗压强度的平均比值为0.87;再生粗骨料取代率对再生混凝土的强度指标影响不大,各种取代率再生混凝土的抗折强度和棱柱体抗压强度与天然骨料混凝土实测值接近;对同批次静置2a的长龄期再生混凝土所测棱柱体抗压强度较标准龄期实测值有较大幅度提高,增大值为16.87%;长龄期再生混凝土的弹性模量较普通混凝土有较大提升,但泊松比的变化不明显,其值相对稳定,且在高取代率时其泊松比数值比普通混凝土有所降低.

    Abstract:

    Recycled coarse aggregate concrete(RAC) specimens were made by the waste concrete, whose original designing strength was C30, including 66 standard prism(150 mm×150 mm×300 mm) and 33 prism with the size of 150 mm×150 mm×550 mm. Using these specimens, the uniaxial compressive strength, flexural strength, elastic modulus and Poissons ratios were determined. The basic mechanical properties of RAC under the different replacement rates were researched. Furthermore, based on the measured data, the stress strain constitutive equation was estsblished. The results show that with the increase of recycled aggregate replacement rate, the prism compressive strength at the standard age is a little higher than that of the natural aggregate concrete(NAC), while RAC and NAC have a similar shape of whole stress strain curves. In the rising stage of the curve, RAC and NAC have basically coincident curve, however, in descending stage, the curves of RAC are much steeper than NACs. For the same batch of RAC at standard age, the ratio of flexural strength to prism compressive strength is about 0.12, and the average ratio of prism compressive strength to compressive strength of the cube is 0.87. The recycled coarse aggregate replacement rate does not have a large influence on the RACs strength, and specimens flexural strength and prism compressive strength with each replacement rate are close to those of NAC. The RACs prism compressive strength with long time setting(2 a) is much higher than that of specimens at standard age, and after calculation, the growing rate reach to 16.87 percents. Comparing with the NAC, the RACs elastic modulus with long age grows greatly, while the Poissons ratios are relatively stable, furthermore, the values under the higher replacement rate are smaller than NAC values.

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陈宗平,徐金俊,郑华海,苏益声,薛建阳,李军涛.再生混凝土基本力学性能试验及应力应变本构关系[J].建筑材料学报,2013,(1):24-32

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  • 收稿日期:2011-09-28
  • 最后修改日期:2011-12-16
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  • 在线发布日期: 2013-03-11
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