Preparation of controlled low-strength materials using recycled powder and construction and demolition waste
CHEN Nuo
WANG Ningning
CHEN Xudong
BAO Yijun
Abstract：Traditional backfill materials have general economy and insufficient fluidity.Controlled Low-Strength Materials (CLSM)were prepared by compound mixing of Construction and Demolition waste(C&D)and Recycled Powder(RP).The variation laws of flowability and unconfined compressive strength of CLSM under different water-to-solid ratios and different RP/C&D ratios were studied,and the phase composition and micro-morphology were explored by XRD and SEM.The results show that with the increase of water-to-solid ratio,the flowability of CLSM increases significantly,while the compressive strength decreases;with the increase of RP/C&D ratio,the flowability of CLSM increases,and the compressive strength first increases and then decreases.When the water-to-solid ratio is 0.7 and the RP/C&D ratio is 0.36,the flowability and compressive strength meet the requirements of municipal pipeline backfilling.
Keywords：construction and demolition wasterecycled powdercontrolled low-strength materialsunconfined compressive strengthflowability
Publication Date：2025-12-25
Online Publishing Date：2026-01-13(First online date of this platform, not the publication date of the document)
Pages：6( 14-18,53 )