Laboratory and Field Mixing Tests of Modified Soil for Self-Use of Construction Waste Sludge

Abstract

The need for "self-use" as a means of recycling construction sludge is increasing. Methods for improving construction sludge include using dedicated treatment plants and soil improvement machines. However, in confined sites, it is difficult to install treatment plants and soil improvement machines, and there are challenges such as the need for dewatering operations for high-moisture sludge. On the other hand, backhoes can be used in confined sites and can improve various types of sludge, but ensuring the quality of the improved soil, which tends to be inconsistent, has been a challenge. Therefore, the authors have developed a quality control method focusing on the uniformity of the improvement effect using infrared thermography.This report discusses the usefulness of the quality control method for indoor experiments mixed manually with a spatula and full-scale experiments mixed with a backhoe.As a result of the full-scale mixing experiment, it was found that surface temperature could be measured in real-time and evaluation based on standard values could be applied. Additionally, it was possible to confirm the variation in surface temperature of the improved soil during mixing from the infrared thermography images, confirming the usefulness of the devised quality control method.