Effect of Additives on Slip-form Construction Performance of Semi-flowable Self-compacting Concrete
HUANG Yanling1, YUAN Qiang1, LIU Yaoqiang2, ZHAO Hu3, WANG Yueyue2, ZUO Shenghao1,4, ZHOU Dajun1,5, SUN Zechuan1
1 National Engineering Laboratory for Construction of High Speed Railway, School of Civil Engineering, Central South University, Changsha 410075 2 Xinyun Engineering Co., Ltd. of China Railway First Group Co., Ltd, Xianyang 712000 3 China Railway Fourth Survey and Design Institute Group Co., Ltd., Wuhan 430063 4 Hunan Heyuan Materials Technology Co., Ltd., Changsha 410000 5 Hunan Yuanhui Railway Engineering Technology Co., Ltd., Changsha 410000
Abstract: Semi-flowable self-compacting concrete is a new type of concrete for slip-form construction, which has self-compacting and fast shape-holding ability for slip-form paving. Adding additives is the main measure to achieve this performance. In this study, rheological curves, spread and slump tests were used to characterize the performance of slip-form construction. Laboratory slip-form paving tests were carried out to study the effects of thixotropic agent, superplasticizer and air entraining agent on the slip-form construction performance of semi-flowable self-compacting concrete. The results show that attapulgite can effectively improve the thixotropy of cement concrete, obviously improve the cohesion of mixtures, and improve the shape-holding ability of concrete after slip-form paving. By adjusting the ratio of superplasticizer to thixotropic agent reasonably, concrete with good fluidity and shape stability can be obtained. The surface quality of concrete after slip-form construction can be further improved by adding air entraining agent
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2019, Vol. 33 
