Correlation between Compressive Strength and Unit Weight of Lightweight Foamed Controlled Low Strength Material (CLSM) Using Coal Ash

Jong-Hwi Lee; Hye-Jin Lee; Byung-Sik Chun

doi:10.7843/kgs.2013.29.1.39

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Correlation between Compressive Strength and Unit Weight of Lightweight Foamed Controlled Low Strength Material (CLSM) Using Coal Ash 석탄회를 활용한 경량기포 CLSM의 압축강도와 단위중량의 상관관계

31 January 2013. pp. 39-47

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Abstract

With the increase in the application of CLSM using coal ash, we performed a basic research on CLSM material, laying focus on the correlation between compressive strength and unit weight of lightweight foamed CLSM. The unconfined compression strength is a criterion for the judgment of the possibility of re-excavation and an important factor determining the economy, efficiency, and excavation character. However, to know the quantitative compression strength value takes a certain amount of time, because the applicability of unconfined compression strength of CLSM is judged by the standard of 28days. Therefore, in this study the relation between compressive strength and unit weight (foam slurry unit weight, apparent unit weight) is analyzed focusing on lightweight foamed CLSM. We also suggested a formula which can easily predict the 28-day compressive strength only using unit weight value without the need to cure the slurry for 28 days.

Keywords

Coal ash

Lightweight foamed CLSM

Unconfined compression strength test

Foam slurry unit weight test

Apparent unit weight test

석탄회를 활용한 CLSM(Controlled Low Strength Material)의 적용성이 증가됨에 따라, 본 연구에서는 경량기포 CLSM의 압축강도와 단위중량과의 관계에 초점을 맞추어, CLSM 재료에 관련된 기초연구를 수행하였다. 일축압축강도는 구조물에 적용시 재굴착이 가능한지를 판단할 수 있는 기준이 되고 있으며 시험결과를 통해 경제성 및 효율성, 굴착성 등을 판단할 수 있는 중요한 배합설계변수이다. 그러나 CLSM의 일축압축강도는 재령 28일 기준으로 적용성을 판단하기 때문에, 정량적인 일축압축강도값을 알기 위해서는 배합 후 일정시간이 지나야한다. 본 연구에서는 저강도 고유동화재(CLSM)에 기포를 혼입하여 경량화시킨 경량기포 CLSM에 중점을 두어 경량기포 CLSM의 압축강도와 단위중량(기포슬러리 단위중량, 겉보기 단위중량)과의 관계를 분석하였고, 슬러리를 28일까지 양생시키지 않고 단위중량만으로 28일의 압축강도를 쉽게 예측할 수 있는 관계식을 제안하였다.

References

1.Amon, J. A. (1990), Controlled Low-Strength Material, The Construction Specifier, pp.98-101.

2.ASTM D 4832(2002), Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders, ASTM, pp.1-5.

3.Choi, N. H. (2004), Analysis of Behavior for Undergroud Pipe Using Controlled Low Strength Material with Field Soil, Master thesis, Hanyang Univ., pp.17-20.

4.Kim, Y. J. (2011), Engineering characteristics of lightweight foamed controlled low-strength materials with coal ash for backfills, Ph.D. thesis, Hanyang Univ., pp.1-97.

5.Kong, J. Y., Kang, H. N., and Chun, B. S. (2010), “Characteristics of Uncofined Compressive Strength and Flow in Controlled Low Strength Materials Made with Coal Ash”, Journal of KGS, Vol.26, No.1, pp.75-83.

6.KS F 2459(2002), Testing methods for density, water content, absorption and compressive strength of cellular concrete, Agency for Technology and Standards, pp.1-3.

7.KS F 4039(1999), Foamed concrete for cast-in-site, Agency for Technology and Standards, pp.1-95.

8.KS L 5201(2006), Portland cement, Agency for Technology and Standards, pp.1-8.

9.Na, J. H. (2011), A Study on Impact factors for Optimum Mix Proportion Investigation of Lightweight Foamed CLSM using Coal Ash, Master thesis, Hanyang Univ., pp.1-54.

10.Ministry of Construction & Transportation(1997), Development and Field Application of Foam Concrete, Dongah Construction Industrial Co., Ltd., pp.10-18.

11.Ministry of Environment(2008), 4th basic plan for recycling of resources, pp.100-102.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 29
No :1
Pages :39-47
Received Date : 2012-07-12
Accepted Date : 2012-12-03
DOI :https://doi.org/10.7843/kgs.2013.29.1.39

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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