减小EPS混凝土收缩的配合工艺试验研究

doi:10.11896/cldb.20070321

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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.

Key words： EPS concrete admixture orthogonal test compressive strength shrinkage property microstructure

Published: Online: 2021-09-07

CLC number:

TU528

Fund:Natural Science Foundation of China(51678379).

About author: Bixiong Lireceived her B.E. degree in industrial and civil architecture from Chengdu University of Science and Technology in 1992 and received her M.S.degree in geotechnical engineering.She was visiting scholar from University of California, Berkeley. Member of the Building Materials Branch of the Chinese Architectural Society, member of the Regenerative Concrete Professional Committee, member of the Construction Solid Waste Committee of the Solid Waste Branch of the Chinese Silicate Society, member of the Expert Committee of the Disaster Prevention and Mitigation Center of the Ministry of Housing and Urban-Rural Construction, member of the Electric Power Disaster Prevention and Mitigation Committee of the Chinese Institute of Electrical Engineering, member of the Sichuan Provincial Committee of Disaster Reduction, member of the eighth, ninth, tenth and eleventh members of the Structural Committee of the Sichuan Civil Engineering Society, the ninth standing member of the Chengdu Civil Construction Society, and vice chairman of the Structure Committee of the Chengdu Civil Construction Society. She served as deputy director of planning and construction department of Sichuan University and director of general engineering and civil engineering department. Main researching work in structural engineering seismic, structural health testing, solid waste buil-ding materials resources, concrete durability and so on. Presided over the National Natural Fund, national key programs and other national, provincial and ministerial level projects, published more than 100 journal papers in important journals at home and abroad, obtained nearly 30 patents. Won the second prize for scientific and technological progress in Sichuan Province and editor one local standard of Sichuan Province.

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	LI Bixiong
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Cite this article:

LI Bixiong,WANG Zhiwen,SU Liuyue, et al. Experimental Study on Matching Process to Reduce the Shrinkage Properties of EPS Concrete[J]. Materials Reports, 2021, 35(16): 16021-16027.

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http://www.mater-rep.com/EN/10.11896/cldb.20070321 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16021

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