再生骨料原位强化对再生混凝土及其结构性能的影响*
- 摘 要
-
(1 浙江工业大学工程设计集团有限公司，杭州 310014; 2 浙江绿城建筑设计有限公司，杭州 310007; 3 浙江工业大学建筑工程学院，杭州 310014)
［摘要］在掺合料裹骨料搅拌工艺的基础上引入纳米硅溶胶，实现再生骨料原位强化，研究了原位强化对不同再生粗骨料取代率再生混凝土强度及结构性能的影响。结果表明：掺合料裹骨料工艺实现再生骨料原位强化，能有效改善再生粗骨料替换造成的强度损失，取代率较低时，28d强度甚至超过天然混凝土的；取代率为60%时，强度仅略有下降。采用原位强化技术制作的再生混凝土梁和天然混凝土梁，裂缝发展及最终破坏的形态相似，承载力可与天然混凝土梁媲美，甚至比天然混凝土梁具有更大的刚度和极限荷载。［关键词］原位强化; 再生骨料; 界面过渡区; 掺合料裹骨料搅拌工艺中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2016)12-0037-04
Influence of in-situ strengthening of recycled aggregate on the performance of recycled aggregate concrete and its structureShan Yuchuan1, Shen Chong2, Kong Deyu3, Zhang Cai1, Zhang Xuefeng1(1 Zhejiang University of Technology Engineering Design Group Co., Ltd., Hangzhou 310014, China; 2 Zhejiang Greencity Architectural Design Co., Ltd., Hangzhou 310007, China; 3 Civil Engineering and Architecture College, Zhejiang University of Technology, Hangzhou 310014, China)Abstract: In-situ strengthening of recycled aggregate (RA) was realized by incorporating colloidal silica sol on the basis of the admixture-coat mixing method and the influences on the strength of recycled aggregate concrete (RAC) with different replacement of RA and also the properties of steel reinforced RAC structure were investigated. The results show that the in-situ strengthening of the RA by admixture-coat mixing method can effectively compensate the strength loss caused by the replacement of RA. The strength of the hardened RAC with a lower substitution rate at 28d is even higher than that of the natural aggregate concrete (NAC). When the replacing rate is 60%, the strength is only slightly decreased. The RAC beam manufactured using in-situ reinforcement technology features the similar crack development process and final failure pattern as the NAC beam. The bearing capacity can also be comparable with the NAC beam, and the stiffness and ultimate load can even be greater than the latter.Keywords: in-situ strengthening; recycled aggregate; interfacial transition zone; admixture-coat mixing method
*浙江省科技厅公益性项目（2015C33019）。通讯作者：章雪峰，高级工程师，Email:12639404@qq.com。
