Current Research and Prospect of Low Strength Flowable Filling Materials
ZHOU Yongxiang1,2,*, HUO Menghao3, HOU Li4, CHEN Zhidong5, ZHANG Lingshuai5
1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China 2 China Concrete & Cement Products Association Geotechnical Stabilization and Solidification Technology Branch, Beijing 100831, China 3 China Academy of Building Research, Beijing 100013, China 4 China Association of Urban Environmental Committee of Construction Waste Management and Recycling, Beijing 100037, China 5 Shenzhen Hongyeji Geotechnical Technology Co., Ltd., Shenzhen 518057, Guangdong, China
Abstract: Backfilling is often required in the construction process of pipe corridors, deep pits, mining areas, bridge culverts, etc., and backfilling with flowable filling materials is a promising technology. Flowable filling materials have significant differences in application occasions, performance requirements, construction methods, material composition and even terminology in different industries. Based on previous studies, this paper puts forward the concept of ‘low strength flowable filling materials’ and elaborates its basic characteristics. At the same time, the development and current status of mine cemented fill materials, controlled low strength materials, and flowable solidified soils are reviewed, and a relative distinction is made between various types of low strength flowable filling materials based on the range of common base material particle sizes. Low strength flowable filling materials are a class of engineering materials with diverse compositions and wide applications. They have outstanding inclusiveness and green and low carbon characteristics. Based on this, a technical system for co-processing of various wastes can be established. However, at present, such materials have major problems such as large water consumption, large differences in composition and performance, and non-uniform testing methods. Therefore, improving the performance of low strength flowable filling materials and expanding their application fields are important directions for the future development of the industry.
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