A Study on the Characteristics of Chlorine-Containg Cement Depending on Changes in Gypsum and Iron Modulus

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

doi:10.7844/kirr.2022.31.3.53

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2022 Vol.31, Issue 3 Preview Page Next Page

Research Paper

A Study on the Characteristics of Chlorine-Containg Cement Depending on Changes in Gypsum and Iron Modulus 이수석고 함량과 Iron Modulus 변화에 따른 염소 함유 시멘트의 특성에 관한 연구

30 June 2022. pp. 53-60

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Abstract

The physical properties of chlorine-containing cement were analyzed to optimize the operational conditions when waste resources containing chlorine were used in the cement manufacturing process. Cement with clinker to gypsum weight ratios of 95:5 and 93:7 were manufactured. In addition, the iron modulus (IM) of clinker was set to 1.3, 1.5, and 1.7 to evaluate the burnability and physical properties of clinker. With constant chlorine content, increasing gypsum content resulted in a decrease in the 3 day-compressive strength, whereas the 28 day-compressive strength increased. In addition, flow and setting time also increased with increasing gypsum content. As the IM decreased, burnability was improved, free-CaO content decreased, alite and ferrite content increased, and compressive strength increased In particular, the compressive strength of IM 1.3 was approximately 14% greater than that of IM 1.7.

Keywords

chlorine

clinker modulus

gypsum

clinker

compressive strength

본 연구에서는 시멘트 제조공정에서 염소를 함유한 폐자원을 활용하였을 때, 염소가 클링커뿐 아니라 최종 제품에 긍정적인 영향을 끼칠 수 있는 최적의 조건을 제시하고자 염소 함유 시멘트의 물리적 특성을 분석하였다. 동일한 조건의 클링커를 이수석고 중량비 95:5 및 93:7로 분쇄 후 실험을 진행하였다. 또한 클링커 모듈러스를 IM 1.3, 1.5 및 1.7로 제어하여 클링커의 광물학적 특성과 물리적 특성을 동시에 분석하였다. 동일 염소 함량 조건에서 이수석고 함량이 증가할수록 3일 압축강도는 감소하였으나, 장기 압축강도 발현율은 증가하였다. 또한 플로우와 응결시간이 증가하는 것을 확인되었다. IM 감소에 따라 우수한 클링커 광물 특성이 발현되어 free-CaO 함량이 감소하고, alite 및 ferrite 광물이 소폭 증가하였다. 압축강도는 IM이 감소할수록 증가하였으며, IM 1.3의 경우 IM 1.7 대비 약 14%가 상승하였다. 이를 통해 시멘트 제조공정에서 폐자원을 활용하여 자원 절약, 에너지 절감 등의 환경적 측면과 아울러 최종 제품인 시멘트 압축강도 등의 성능 향상에 긍정적인 영향을 미치는 것을 기대할 수 있었다.

키워드

염소

클링커 모듈러스

이수석고

클링커

압축강도

References

Korea Waste Association, Waste statistics, http://www.kwaste.or.kr/bbs/content.php?co_id=sub0401, October 21, 2020.

Council Chungbuk, 2019 : The effect of waste recycling in the cement industry.

Peter C. Hewlett, 2020 : Lea’s Chemistry of Cement and Concrete, 4^th Edition, Elsevier, pp.436-437.

Young-Jun Lee, Nam-Il Kim, Jeong-Hoon Cho, et al., 2021 : A Study on the Characteristics of Clinker and Cement as Chlorine Content, KIRR, 30(5), pp.10-16. 10.7844/kirr.2021.30.5.10

Eun-Seok Kim, Hong-ki Heo, Jong-Tae Jang, et al., 2002 : Characteristics of Cement Hydration by Chlorine Content, Cement Symposium, 29, pp.145-150.

Hyeon-Il Jung, Wan-Ho Cha, Cheol-Min Kim, 2004 : A Study on the Optimum Gypsum Amount in Cement, 31, pp.59-68.

H. Kato and K. Yoshioka, 1998 : Influence of Sulfate Ion on the Superplasticizer, Cement Science and Concrete Technology, 52, pp.144-151.

K. Negishi, Y. Nakajima, H. Sugaya, et al., 1998 : Effect of Polymorphism of Calcium Sulfate and Soluble Alkaries on Fluidity of Cement Paste Containing Polycarboxylic Acid Type Superplasticizer, Cement Science and Concrete Technology, 52, pp.152-157.

Eui-Hak Lee, Jun-Yeong Jeon, Jin-Wook Kim, et al., 2000 : A study on the Effect of Plaster Form and Amount on the Quality of Cement Hardened Body, Cement Symposium, 27, pp.42-47.

Seung Tae Lee, 2015 : Evaluation on the Performance of Mortars Made with Calcium Aluminate Cement, KSMI, 19(6), pp.80-87. 10.11112/jksmi.2015.19.6.080

Eui-Hak Lee, Jun-Yeong Jeon, Jin-Wook Kim, et al., 2005 : Study of Clinker Characteristics by Cooling Start Temperature and IM Change, Cement Symposium, 32, pp.49-56.

Bong-Hee Kang, Jae-won Choi, Tae-Kyoung Ki, et al., 2020 : Study on Burnability and Reactivity of High Al₂O₃ Content OPC Clinker for the Use of Industrial Waste, J Rec Const Resources, 8(3), pp.294-301.

Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 31
No :3
Pages :53-60
Received Date : 2022-02-21
Revised Date : 2022-05-10
Accepted Date : 2022-05-15
DOI :https://doi.org/10.7844/kirr.2022.31.3.53

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

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