Effect of Silica Fume on Interfacial Transition Zone of Recycled Concrete
GAO Song1,2, BAN Shunli1, GUO Jia1, ZOU Chuanxue3, GONG Yaoyao1
1 School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China 2 Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266033, Shandong, China 3 Qing Jian Group Co., Ltd., Qingdao 266033, Shandong, China
Abstract: In order to improve recycled concrete's mechanical properties and durability, silica fume was used as a reinforcing material. The influence of silica fume on the compressive strength at 3 days, 28 days, and 90 days and the ability to resist chloride ion penetration at 28 and 90 days for the recycled concrete were investigated. The microstructure of recycled concrete at 28 days was analyzed by micro-testing equipment such as scanning electron microscopy, microhardness tester. The Mercury Intrusion Porosimetry was used to investigate pore structure parameters and analyze the effect of silica fume on the pore properties. The results show that silica fume is beneficial to improve the ability to resist chloride ion penetration for recycled concrete, and the strengthening effect increases first and then decreases with the increasing of silica fume dosage. Silica fume improves the structure of multiple interfacial transition zones for recycled concrete, increasing ITZ microhardness and reducing ITZ porosity. There are many harmful pores in recycled concrete, silica fume refines the pore structure and reduces the porosity of the recycled concrete, the improvement effect is the best at the dosage of 6%.
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2023, Vol. 37 
