• 콘크리트학회논문집
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• 제22권2호
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• pp.255-262
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• 2010

이 연구에서는 폐석분 활용 경량골재 콘크리트의 염화물 확산에 대한 기초자료를 제공하고자 하였다. 이에 콘크리트의 골재를 부순골재(CG), 폐석분을 활용한 단일 입도의 비조립형 경량골재(SLG), 연속 입도의 비조립형 경량 골재(CLG), 물결합재비 0.4, 0.5, 0.6, 결합재 FA, BFS로 실험을 실시하였다. 염화물 확산 계수는 NT BUILD 492준하여 시험 후 산출하였으며 SLG와 CLG콘크리트의 확산계수는 CG콘크리트보다 다소 크게 나타났으나 큰 차이는 없었다. 또한 염화물 확산계수는 물결합재비에 의한 영향이 크며 물결합재비가 낮을수록 감소하는 것으로 나타났고 혼화재 치환은 FA15%의 경우 물결합재비 0.4에서만 감소를 나타내는데 비해 FA10 + BFS20% 모든 수준에서 감소하는 것으로 나타나 더 적합한 것으로 사료된다. 경량골재 콘크리트의 염화물 확산을 분석한 결과, 폐석분 활용 경량골재 콘크리트가 CG콘크리트에 비하여 염화물 확산 계수가 크지만 큰 차이는 없으며 물결합재비 및 혼화재 치환으로 저항성을 향상 시킬 수 있다. 또한 경량골재에 대해 강도에 따른 염화물 확산 계수를 추정 할 수 있다.

• 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.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2004년도 학술대회지
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• pp.55-58
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• 2004

This paper investigated the results of quality of concrete using mixed sand with grading adjustment in order to find out the applicability of fine aggregate with bad grading, According to test results, fluidity of concrete with fine level grading river sand was decreased while with coarse level grading crushed sand increased compared with that with medium level grading crushed sand. Use of mixed sand with grading adjustment(MSG) resulted in an improvement in fluidity. Increase in fineness modulus led to an increase in bleeding, For compressive strength, use of MSG increased compressive strength. For drying shrinkage, use of fine level grading river sand resulted in an increasing drying shrinkage due to the larger presence of fine particles, while use of MSG led to a reduction in drying shrinkage

• 콘크리트학회지
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• 제6권2호
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• pp.108-117
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• 1994

국내에서는 아직 알칼리-골재 반응으로 인한 피해가 보고되지는 않았지만, 해사와 쇄석의 사용이 증가하고 있어 이에 대한 연구가 시급히 진행되어야 할 것으로 사료되어, 화학법(KS F 2545, ASTMC 289)과 모르터바법(KS F 2546, ASTM C 227)을 중심으로 실험을 행하여 국내산 쇄석1종과 국외산 쇄석 1종이 유해로 판정되었으며, 첨가알칼리성량 및 종류를 달리하여 실시한 모르터바법 시험결과 첨가 알카리로 NaCl사용시 가장 높은 팽창을 하였다. 또한, 모르터바의 표면 및 내부의 반응생성물을 SEM에 의한 관찰과 EDXA에 의한 성분분석을 실시하여 알칼리와 실리카성분으로 이루어진 알칼리 실리케이트 겔임이 판명되어 국내에서 알칼리 반응성을 나타내는 골재의 존재가 처음으로 확인되었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.157-160
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• 2006

Recently, trouble of sand supply is occurred according to exhaustion of natural sand resources. To solve this problem, sea sand and crushed sand are used. But, necessity of water reducing agent because quality of concrete that use sea sand and crushed sand is deteriorated. Therefore in this study was examined on the engineering properties of concrete with kind of fine aggregate and addition ratio of water reducing agents. As a result, compressive strength appeared similar standard regardless of kind of fine aggregate. Compressive strength, durability was similar in decrease of the unit water content by increase of addition ratio of the water reducing agent. Also, drying shrinkage resistivity was improved because the unit water content decreased.

• 한국농공학회지
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• 제45권1호
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• pp.74-82
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• 2003

In this paper, an experimental program was undertaken to test the analysis on Component and mechanical characteristics for crushed stone of excavated Rocks from Sandstone, Shale, Mudstone, for use as a new source of aggregate. Physical and mechanical properties, required for aggregate materials, of major constituents of rock wastes including Sandstone, Shale, Mudstone, Felsite, Basalt, Marl were measured in the laboratory Test results showed that the Shale, Felsite, Basalt tested in this study might possibly be used for construction aggregates. In case of Sandstone and Mudstone, some physical properties such as rock strength were generally adoptable but the aggregate characteristics were lower than required.

• 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 2000년도 가을 학술발표회논문집(I)
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• pp.138-143
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• 2000

In this paper, we carried out experiment to use crushed waste glass as a fine aggregate. This study delt with the comparative analysis on the construction works and engineering properties of concrete containing crushed waste glass through physical experiment. The experimental variables are crushed waste glass substitution ratio and W/C(38, 53%). When the W/C was 38%, we could know that concrete containing crushed waste glass was good as general concrete on the construction works and engineering properties but the concrete containing crushed waste glass applied W/C 53% was not good as general concrete on those. Therefore, concrete containing crushed waste glass applied W/C 53% should use admixture on the site.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 봄 학술발표회 논문집
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• pp.197-202
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• 1994

This study is designed for analyzing the physical properties of grading, shape, specific gravity and etcetera of mine-waste as the aggregate of concrete when mine waste is crushed by jaw crusher, and is aimed presenting the using the possibility, content and reference data for the quality control of practical use on the concrete using the mine-waste aggregate.