再生混凝土骨料咬合及剪力传递机理

发布时间：2018-02-03 14:30

本文关键词： 再生混凝土裂缝剪力传递 push-off试件骨料咬合模型　出处：《同济大学学报(自然科学版)》2014年01期 　论文类型：期刊论文

【摘要】：通过预裂再生混凝土push-off试件的裂缝处剪力传递性能试验,研究了再生混凝土裂缝处骨料咬合及剪力传递性能.结果表明:再生混凝土裂缝处剪力传递性能总体上与普通混凝土较为接近;约束刚度越大,试件的剪力传递强度越高;再生混凝土强度越高,试件的剪力传递强度有一定的提高;相同混凝土强度下,随着再生粗骨料取代率的提高,试件剪力传递强度略有降低.借鉴Walraven的理论,并考虑再生混凝土的细微观结构与再生粗骨料的几何特点,得到了再生混凝土中的骨料咬合模型.试验中各试件的剪力传递强度值与相关理论计算值吻合良好.
[Abstract]:The shear transfer behavior of pre-cracked recycled concrete (push-off) specimens at cracks was tested. The behavior of aggregate bite and shear force transfer in recycled concrete crack is studied. The results show that the shear force transfer performance of recycled concrete crack is close to that of ordinary concrete on the whole. The higher the constraint stiffness, the higher the shear transfer strength of the specimen. The higher the strength of recycled concrete is, the higher the shear transfer strength of the specimen is. Under the same concrete strength, with the increase of the replacement ratio of recycled coarse aggregate, the shear transfer strength of the specimen decreases slightly. The theory of Walraven is used for reference. Taking into account the fine microstructure of recycled concrete and the geometric characteristics of recycled coarse aggregate, the aggregate bite model in recycled concrete is obtained. The shear transfer strength of each specimen is in good agreement with the theoretical calculation.
【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金项目(51178340) 上海市科委项目(10231202000)
【分类号】：TU528
【正文快照】： 利用再生骨料作为部分或全部骨料配制的混凝土称为再生骨料混凝土(recycled aggregateconcrete,RAC),简称再生混凝土[1-2].由于再生骨料表观密度小,吸水率大,孔隙率大等[2-3]特点,在等水灰比的情况下,再生混凝土的强度略低于普通混凝土[4-5].国外学者通过混凝土构件的剪切试验

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