Experimental Study of Waste Tire Powder-Added Lightweight Soil as Flowable Backfill

J. Ocean Eng. Technol. 2008;22(5):112-118.

Kim Yun-Tae,Kang Hyo-Sub

Department of Ocean Engineering Pukyong National University,Department of Ocean Engineering Pukyong National University

유동성 뒷채움재인 폐타이어 혼합경량토에 대한 실험적 연구

김윤태,강효섭

부경대학교 해양공학과,부경대학교 해양공학과

Keywords: Lightweight soil, Waste tire powder, Dredged soil, Flow test

핵심용어: 경량토, 폐타이어 분말, 준설토, 유동성 시험

Abstract

The purpose of this study was to determine the engineering and environmental properties of the waste tire powder-added lightweight soil (TLS) used as flowable backfill. The TLS used in this experiment consisted of dredged soil, bottom ash, waste tire powder and cement. Test specimens were prepared with various contents of waste tire powder ranging from 0% to 100% at 25% intervals and water contents ranging from 140% to 200% by the weight of the dry dredged soil. Several series of unconfined compression tests, flow tests, and leaching tests were carried out. Experimental results for the TLS indicated that the unconfined compressive strength, secant modulus (), and unit weight of the TLS decreased with an increase in waste tire powder content. However, as the waste tire powder content increased, the stress-strain relationship of the TLS showed more ductile behavior rather than brittle behavior. The flow value increased with an increase in water content, but decreased with an increase in waste tire powder content. The result of the leaching test showed that the leaching amounts of heavy metals were lower than the permitted limits suggested by the Ministry of Environment.