Formulation of Controlled Low Strength Materials Using Cement Industry Chlorine Bypass Dust and Water Washing Residue

Sun Mok Lee; Ju Chan  Jang; Byung Jae Lee

doi:10.7844/kirr.2025.34.3.26

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2025 Vol.34, Issue 3 Preview Page Next Page

Research Paper

Formulation of Controlled Low Strength Materials Using Cement Industry Chlorine Bypass Dust and Water Washing Residue 시멘트 산업 염소 바이패스 분진 및 수세 잔류물을 활용한 저강도 고유동 충전재 배합연구

30 June 2025. pp. 26-33

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Abstract

This study investigated the feasibility of utilizing chloride bypass dust (CBPD) and its washed residue (WR), which are byproducts of the cement industry, as controlled low-strength materials (CLSM). The fundamental mix design characteristics were examined by replacing ordinary Portland cement (OPC) and slag cement (SC) with CBPD and WR at substitution ratios of 25%, 50%, and 75%,respectively. The effects on water-to-cement ratio (W/C), flowability, and compressive strength were analyzed. As the replacement level increased from 25% to 75%, both CBPD and WR mixtures exhibited reduced flowability and compressive strength. Notably, WR required a higher W/C than CBPD to maintain equivalent workability, which was attributed to the pronounced early hydration activity of portlandite, a primary mineral in WR. Compressive strength measurements at 3, 7, and 28 days of curing revealed that the SC-based mixtures outperformed their OPC counterparts. This enhancement is linked to the latent hydraulic properties that are activated by the alkali components in CBPD and WR. At the 75% replacement level, both OPC and SC mixtures satisfied the 28-day compressive strength criterion (≤8.3 MPa) stipulated by ACI 229 Committee for CLSM, thereby confirming the viability of these mixtures as sustainable alternatives in CLSM applications.

Keywords

cement

bypass

dust

water residue

controlled low strength material

시멘트 산업에서 발생하는 염소 바이패스 분진(CBPD)과 이를 수세한 수세 잔류물(WR)을 활용하여 저강도 고유동 충전재(CLSM, controlled low-strength materials)로의 적용성 가능성을 분석보기 위해기본 배합 특성을 살펴보았다. 이를 위하여 보통 포틀랜드 시멘트(OPC)와 슬래그 시멘트(SC)에 CBPD와 WR에 일정비율로 대체하여 혼합한 후 W/C, 유동성 및 압축강도 변화에 미치는 영향을 살펴보았다. CBPD와 WR의 함유량을 25%, 50%, 75%로 증가시킬수록, 작업성 유지를 위한 W/C는 두 재료에서 상이하게 나타났다. 즉, CBPD와 WR의 함유량을 25%에서 75%까지 증가함에 따라 유동성과 압축강도가 감소하였으며, 동일한 작업성을 확보하기 위해 WR에서는 CBPD보다 더 높은 W/C 가 요구되었으며, 이는 WR의 주요 구성 광물인 Portlandite의 초기 수화 활성 영향이 크게 작용한 결과로 판단된다. 또한 3일, 7일, 28일 경화시간에 따른 압축강도는 OPC와 비교하여 SC에서 상대적으로 큰 것을 확인하였다. 이 결과는 CBPD와 WR에 함유된 알칼리 성분에 의한 잠재 수경성 발현에 기인한 것으로 판단되며, CBPD와 WR의 함유량 75% 조건에서 OPC 및 SC 모두 28일 압축강도가 ACI 229 Committee에서 규정한 CLSM 품질 기준을 만족하여 CLSM 원료로의 활용 가능성을 확인하였다.

키워드

시멘트

바이패스

분진

수세잔류물

고유동 충전재

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 34
No :3
Pages :26-33
Received Date : 2025-04-09
Revised Date : 2025-05-20
Accepted Date : 2025-05-27
DOI :https://doi.org/10.7844/kirr.2025.34.3.26

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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