再生骨料原位强化研究

再生骨料原位强化研究

孔德玉¹，单玉川²，薛思滔¹，万励¹，章雪峰²，马成畅¹

（1. 浙江工业大学建筑工程学院，浙江 杭州310014;2. 浙江工业大学工程设计集团有限公司，浙江 杭州310014）

摘要：通过模拟实验与微观结构分析研究了掺合料浆液包覆处理对新老混凝土复合试件水化硬化过程中模拟再生骨料界面以及本身强度的影响。结果表明，采用掺合料浆液进行表面处理可有效实现再生骨料的原位强化及其与水泥石之间的界面强化，其中硅粉浆液处理对模拟再生骨料原位强化与界面强化效果最佳，粉煤灰浆液处理对再生骨料的原位强化效果优于矿粉浆液，但对界面强化的效果却较弱，其原因与掺合料颗粒的粒径大小以及火山灰活性有关。

关键词：再生骨料；原位强化；界面强化；掺合料

中图分类号：TU528；TU502⁺.6；TG115.21⁺5.3  文献标识码：A   doi:10.3969/j.issn.1000-6281.2015.06.004

In-Situ strengthening of recycled aggregate

KONG De-yu¹，SHAN Yu-chuan²，XUE Si-tao¹，WAN Li¹，ZHANG Xuefeng²，MA Cheng-chang¹

（1. Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou Zhejiang 310014；2. Zhejiang University of Technology Engineering Design Group Co. Ltd., Hangzhou Zhejiang 310014, China）

Abstract:In-situ strengthening and interfacial strengthening of recycled aggregate in new-old concrete composite specimen were studied by simulation experiment and microstructure analysis.The simulated recycled aggregate was coated by using mineral admixture slurry before preparing the composite specimen. Shear strength of the composite specimen and compressive strength of the simulated recycled aggregate were tested after curing for 28 days. The results showed that surface treatment by using admixture slurry could effectively improve both the interfacial bond strength and the compressive strength of the simulated recycled aggregate itself. While coating with silica fume slurry, an optimum interfacial and in-situstrengthening effect was obtained for the simulated recycled aggregate.Surface-treating by using fly ash slurry showed a better in-situ strengthening effect, but a less improvement in interfacial bond strength, than that with slag slurry, which was related to the particle size and pozzolanicreactivity of the admixture.

Keywords:Recycled aggregate; in-situ strengthening; interfacial strengthening; admixture

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