A Study on the Characteristics of Clinker and Cement as Chlorine Content

Young-Jun Lee; Nam-Il Kim; Jeong-Hoon Cho; Sung-Kwan Seo; Yong-Sik Chu

doi:10.7844/kirr.2021.30.5.10

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2021 Vol.30, Issue 5 Preview Page Next Page

Research Paper

A Study on the Characteristics of Clinker and Cement as Chlorine Content 염소 함량에 따른 클링커 및 시멘트의 물성에 관한 연구

31 October 2021. pp. 10-16

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Abstract

In this study, a clinker was prepared using raw materials with CaCl₂. The characteristics of the chlorine-added clinker and cement were analyzed. The clinker modulus were set to Lime Saturation Factor (LSF) 92, Silica modulus (SM) 2.5, and Iron Modulus (IM) 1.5. The physical properties of cement using the chlorine-containing clinker were characterized. As the chlorine content increased, the free-CaO content in the clinker decreased, and that in the 2000 ppm clinker was reduced by approximately 40% compared to that in the 0 ppm clinker. There was an increase in the amount of chlormayenite, with a content of up to 3.4% present in the 2000 ppm clinker. The amounts of alite and belite also slightly increased. The compressive strength of mortar at 3 days and 7 days increased as the chlorine content increased. This trend was presumed to arise from the effect of hydration, which was promoted by the presence of chlorine. The compressive strength of 1000 ppm mortar increased by approximately 20% compared to that of 0 ppm mortar.

Keywords

chlorine

calcium chloride

clinker

chlormayenite

compressive strength

본 연구에서는 클링커 및 시멘트의 염소 함량에 따른 특성 변화를 분석하기 위해, 혼합원료 제조 시 CaCl₂를 첨가하여 클링커를 제조하였다. 이때 클링커 모듈러스는 LSF(Lime Saturation Factor) 92, SM(Silica Modulus) 2.5 및 IM(Iron Modulus) 1.5로 고정하였다. 또한 염소 함유 클링커를 사용하여 시멘트를 제조한 후 물리적 특성도 시험하였다. 염소 함량 증가에 따라 클링커의 free-CaO가 감소하였으며, 특히 염소 함량 0ppm 대비 2000ppm 조건에서 약 40% 감소하였다. 또한 chlormayenite 생성량도 증가하여, 2000ppm 클링커에서 최대치인 3.4%가 존재하였다. Alite와 belite 생성량도 소폭 증가하였다. 모르타르의 3일 및 7일 압축강도는 염소함량 증가에 따라 상승하였으며, 이는 염소 성분에 의한 시멘트 수화촉진 영향으로 추정되었다. 특히 1000ppm 모르타르의 압축강도는 0ppm 모르타르 대비 약 20%가 상승하는 결과가 도출되기도 하였다.

키워드

염소

염화칼슘

클링커

클로르메이어나이트

압축강도

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 30
No :5
Pages :10-16
Received Date : 2021-08-12
Revised Date : 2021-09-14; 2021-09-30
Accepted Date : 2021-10-05
DOI :https://doi.org/10.7844/kirr.2021.30.5.10

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

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