Study on the Engineering Properties of Waste Soil-Based Flowable Fill

Abstract

Flowable fill is developed mainly for the difficult backfilling and compaction such as side trenches of foundation pits and retaining wall backfills. It can make use of waste soils. It has good flowability before curing, and thus can be compacted by its own weight. It also has high strength after curing. In this study, by using on-site waste soils as the raw material soil, 25 groups of flowable fill experiments were carried out. The relationship between flowability, strength and mix ratio of flowable fills was analyzed. The results show that the flowability of flowable fill increases with the increase of water-soil ratio and decreases with the increase of cement-soil ratio. It shows that the water-soil ratio is the main control index of its flowability. The strength of flowable fill increases with the increase of cement-soil ratio, and decreases with the increase of water-soil ratio. The water-cement ratio can be used as the main control index for the strength of the material within the tested range.