Comparison of Compressive Behavior Characteristics between Unreinforced and Reinforced Lightweight Soils for Recycling of Dredged Soils

J. Ocean Eng. Technol. 2005;19(6):44-49.

Kim, Yun-Tae;Kwon, Yong-Kyu;Kim, Hong-Joo;

Dept. of Ocean Engineering, Pukyong National University;Dept. of Ocean Engineering, Pukyong National University;Dept. of Ocean Engineering, Pukyong National University;

준설토 재활용을 위한 무보강 및 보강 경량토의 압축거동특성 비교

김윤태;권용규;김홍주;

부경대학교 해양공학과;부경대학교 해양공학과;부경대학교 해양공학과;

Keywords: Reinforced Lightweight Soil, Waste Fishing Net, Dredged Soil, Unconfined Compression Test

핵심용어: 보강 경량토, 폐어망, 준설토, 일축압축강도시험

Abstract

This paper investigates strength characteristics and stress-strain behaviors of unreinforced and reinforced lightweight soils. Lightweight soil, composed of dredged soil, cement, and air-foam, was reinforced by a waste fishing net, in order to increase its compressive strength. Test specimens were fabricated by various mixing conditions, such as cement content, initial water content, air content, and waste fishing net; then, unconfined compression tests were carried out on these specimens. From the test results, it was shown that reinforced lightweight soil had different behavior after failure, even though it had similar behavior as unreinforced lightweight soil before failure. The test results also showed that stress became constant after peak strength in reinforced lightweight soil, while the stress decreased continuously in unreinforced lightweight soil. It was observed that the strength was increased due to reinforcing effect by the waste fishing net for most cases, except high water content greater than $218%$. In the case of high water content, a reinforcing effect is negligible, due to slip between waste fishing net and soil particles. In reinforced lightweight soil, secant modulus (E50) was increased, due to the inclusion of waste fishing net.