• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.249-254
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• 2002

In Korea, due to the shortcomings of natural aggregates and increasing needs of crushed stones, it is necessary to examine the alkali-aggregate reaction of the crushed stones. The purpose of this study is to analyze petrographic properties and alkali-aggregate reaction of crushed stones This study was peformed to investigate the alkali-aggregate reaction of crushed stones using chemical analysis, physical properties, XRD, XRF and mortar-bar method.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1992년도 가을 학술발표회 논문집
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• pp.25-30
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• 1992

Since the first report on the damage of concrete structures due to alkali-aggregate reaction by T.E Stanton in 1940, cases of the damage are being reported in many countries. in the country, it is necessary to research the alkali-aggregate reaction of the crushed stone because of the short comings of natural aggregate and increasing needs of crushed stones. In this research, crushed stones from 63 local sites are collected and tested by ASTM C 289 chemical method.. The results show that most of the crushed stones are innocuous. However, the crushed stones from three sites are deleterious to the reaction by JIS A 5308. Petrographic and Mortar-Bar test will be carried out to find out any possibility of deleteriousness of the crushed stones

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1992년도 가을 학술발표회 논문집
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• pp.50-53
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• 1992

The damages due to alkali-aggregate reaction between the reactive silicia constituents of the aggregate and the alkalies in cement have been frequently reported since 1923 in America . Recently alkali-aggregate reaction, especially alkali-silica reaction, can be found all over the area using crushed stones. The first research, in 1990, was performed to identify the alkali-silica reactivity of 18 sets of crushed stones used in domestic ready-mixed concrete plant as coarse aggregates by 4 petrollgical, chemical and mortar bar method, And the study was continued with 10 sets of crushed stones in this research. It was found that all the aggregates used in this study are innocuous at alkali-silica reaction.

• 대한공간정보학회지
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• 제13권4호
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• pp.47-58
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• 2005

전라남도 곡성군 남부에 위치한 원등지역에서 기반암의 품질을 검토하고 지리정보시스템(GIS)을 이용하여 개발난이도를 분석하였다. 기반암의 품질을 알기 위하여 야외조사를 수행하였고, 실내에서 물성을 분석하였다. 또한 GIS를 이용한 개발난이도 분석에서 가시권분석과 거리분석을 통해 법적개발제한지역을 분석하였다. 원등일대 연구지역의 기반암 품질과 개발난이도를 분석한 결과, 모두 개발이 가능한 품질을 가지고 있으며, 개발제한사항에 해당되는 정도에 따라 개발난이도가 구분되었다. 또한 개발 난이도가 가장 낮은 조사지역의 약 30 % 지역이 개발 가능한 것으로 나타났다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1993년도 봄 학술발표회 논문집
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• pp.1-5
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• 1993

In the country, due to short comings of natural aggregates of good quality, it is common to use crushed stones. However, the investigation has not been done on the chemical reaction of crushed stones. This study tested and analyzed the aggregate chemical reaction by petrographic examination(ASTM C 295) for the test aggregates which had been tested by chemical method(ASTM C 289) in the first year. As a result, most of test aggregates didn't show any reaction but many have common deleterious mineral. Therefore, there exists the possibility of chemical reaction in petrogrphic point of view

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1993년도 가을 학술발표회 논문집
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• pp.97-102
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• 1993

In the country, due to short comings of natural aggregates of good quality, it is common to use crushed stones. However, the investigation has not been done on the chemical reaction of crushed stones. This study tested and analyzed the aggregate chemical reaction by Petrographic Examination(ASTM C 295),Chemical Metho(ASTM C 289) and Mortar-Bar Method (ASTM C 227). As a result, most of test aggregates didn't show any reaction but many have common deleterious mineral. Therefore, there exists the possibility of chemical reaction in petrographic point of view.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 봄 학술발표회 논문집
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• pp.169-173
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• 1994

Recently, the use of crushed stones is increased due to the shortage of natural aggregates. In the previous papers of part 1 and 2, we got the conclusions that some of crushed stones have the characteristic of alkali-silica reaction(ASR). And these reactions are influenced by the amount and type of alkali in cement. The purpose of this paper is how to prepare for the prevention against alkali-silica reaction. As a solution of problems, we have conducted the experiments of two methods. One was the replacement of innocuous aggregates instead of reactive aggregates, the other was the addition of various pozzolanic materials. As a result, we found that the expansion by alkali-silica reaction in mortar bar could be effectively decredsed by upper methods.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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• pp.447-450
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• 1994

The chemical method and mortar-bar method for identification of the susceptibility to Alkali-Aggregate Reaction (AAR) was established as KS method by referencing the ASTM methods. However, the chemical method requires skilled chemical engineers and aggregates are tested in very severe condition, and on the other hand, the mortar-bar method needs a long time of 3 or 6 months. Judging from this circumstance that the use of crushed stones are increased due to the shortage of natural aggregates, the development and standardization of a new rapid test method is considered essential. The purpose of this paper is to research for the possibility to apply the rapid method, instead of the chemical method and the mortar-bar method with using the several domestic crushed stones.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1991년도 봄 학술발표회 논문집
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• pp.93-98
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• 1991

The damages due to alkali-aggragate reaction between the reactive silica constituents of the aggregate and the alkalies in cement have been frequently reported since 1923 in America. Recently, alkali-aggregate reaction, especially alkali-silica reaction, can be found all over the area using crushed stones. This research was performed to indentify the alkali-silica reactivity of 18 sets of crushed stones being used currently in domestic reacy-mixed concrete plant as coarse aggregates by petrollogical, chemical and mortar bar method. It is found that all the aggregates used in this study are innocuous at alkali-silica reaction. Further study will be carried out with some aggregates in more severe conditions.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1993년도 가을 학술발표회 논문집
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• pp.103-107
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• 1993

The Alkali Aggregate Reaction(AAR), reported first by T. E. Stanton in 1940, is a reaction between certain siliceous aggregate and hydroxyl ions present in the pore fluid of a concrete. The damage of concrete structures, deteriorated by AAR, have been reported since using the crushed stones caused by the exhaustion of natural aggregates. This study was performed to investigate the AAR of crushed stones using chemical analysis, polarization microscope, XRD, chemical method(KS F 2545, ASTM C 289), mortar bar method(KS F 2546, ASTM C 227) and Scanning Electron Microscope(SEM) and Energy Dispersive X-ray Analysis (EDXA) of reaction products by AAR in mortar bar.