Experimental Study on Matching Process to Reduce the Shrinkage Properties of EPS Concrete
LI Bixiong1, WANG Zhiwen1, SU Liuyue1,2, LENG Faguang3
1 Key Laboratory of Deep Underground Science and Engineering for Ministry of Education, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; 2 School of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China; 3 State Key Laboratory of Building Safety and Built Environment, China Academy of Building Research, Beijing 100013, China
Abstract: Based on the orthogonal test, this paper investigates the effects of the dosage containing cementitious material, fly ash and river sand on the volume density, compressive strength and shrinkage value of EPS concrete. The results represent that the volume density of all groups of EPS concrete are between 450—600 kg/m3. Cementitious material is the key factor to affect the strength and shrinkage of EPS concrete. Moreover, the effect of sand content on the shrinkage of EPS concrete is greater than that of its compressive strength. The optimum combination ratio is that cementitious material 340 kg/m3, fly ash 10% (mass ratio of cementitious materials), sand 140 kg/m3. The shrinkage of EPS concrete can be significantly reduced by shrinkage reducing agent, redispersible latex powders and xanthan gum, while representing a good power function relationship with water loss ratio. The microstructure of EPS concrete is also researched by scanning electron microscopy (SEM). The results show that the amount of needle-like AFt in the interface transition zone are increased obviously by shrinkage reducing agent. After the redisper-sible latex powders are condensed to form latex film, it can enhance the cementation of hydration products and block harmful pores to prevent water losses. Meanwhile, xanthan gum can significantly improve the hydrate integrity by decreasing the content of the AFt existing in the interfacial transition zone (ITZ) of EPS concrete.
李碧雄, 汪知文, 苏柳月, 冷发光. 减小EPS混凝土收缩的配合工艺试验研究[J]. 材料导报, 2021, 35(16): 16021-16027.
LI Bixiong, WANG Zhiwen, SU Liuyue, LENG Faguang. Experimental Study on Matching Process to Reduce the Shrinkage Properties of EPS Concrete. Materials Reports, 2021, 35(16): 16021-16027.
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2021, Vol. 35 
