• Resources Recycling
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• v.25 no.4
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• pp.80-86
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• 2016

To investigate the current status of aggregate industry in Korea, the law of aggregate gathering, the law of forest management, the aggregate statistics of demand and supply in recent years, and market price of aggregate were reviewed. It is conformed that the forest aggregate industry is developing year by year and leading the industry. In addition, in order to well understanding about aggregate industry, the production system and process of the Whaseong forest aggregate quarry were introduced.

• 주택과사람들
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• no.3 s.20
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• pp.33-36
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• 1992

[ ${\circ}$ ] 건설부는 성수기의 골재 부족 현상과 비수기의 골재생산업체의 경영난을 해소하기 위하여 골재비축계획을 마련하였음. -골재수요는 건설경기의 계절성으로 인하여 변동폭이 큰 반면 골재공급은 주문생산성 및 비탄력성으로 매년 성수기에 골재 부족현상이 나타나고 있으며 -골재생산업체는 비수기의 골재수요 감소로 조업의 중단 또는 단축이 불가피하여 유휴장비${\cdot}$인력의 발생으로 경영의 비효율성 초래 -따라서 비수기의 골재를 비축하므로서 ${\cdot}$ 골재수요를 창출하여 골재생산업체의 유휴장비와 인력의 활용이 가능하게 하여 경영의 어려움을 해결하고 ${\cdot}$ 비축골재를 성수기에 방출하여 골재부족현상에서 오는 골재가격의 상승과 부실공사를 방지하고자 함. ${\circ}$ 골재 비축 계획의 주요내용을 보면 -골재 비축자금 : 국민주택기금 100억원(연리 $10{\%}$ -비축자금 대여대상 : 1) 신도시 건설에 참여한 주택건설등록업자 중 현장에 배처플랜트 설치업체 2) 수도권 소재 KS 레미콘 생산업체 3) (주)한국골재산업 -자금대출공고 : ''91. 11. 25${\~}$''91. 11. 30(주택은행) -대상업체 선정 : ''91. 12. 1${\~}$''91. 12. 5(한국주택사업협회, 레미콘 공업협회 및 조합, (주) 한국골재산업이 상호 협의하여 결정) ${\circ}$ 예상 비축량은 매사 1,000천${m^{3}$로 동일조건 일괄공동계약 방식에 의해 12월${\~}$2월에 구매하여 5월${\~}$6월과 10${\~}$11월 성수기에 방출할 예정임.

• Economic and Environmental Geology
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• v.53 no.6
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• pp.755-769
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• 2020

In 2019, about 134 million ㎥ of aggregate was produced in an estimated 880 quarries and pits in 17 metropolitan governments. Leading producing metropolitan cities were Gyeonggi-do, Gyeongsangnam-do, Chungcheongbuk-do, Gangwon-do, Gyeongsangbuk- do, Chungcheongnam-do, in order decreasing volume, which together accounted for about 71% of total product. Of the total domestic aggregates produced in 2019, about 31 % was sand and about 69% was gravel. It estimated that of the 134 million ㎥ of aggregates in Korea in 2019, about 50.3% was produced by screening crushed aggregate by 41.4% by forest aggregate, 3.3% by land aggregate, 1.7% by sea aggregate and 1.7% by washing each other, and 0.7% by river aggregate. This indicates that screening crushed aggregate and forest aggregate are the main producers of domestic aggregates. The most crushed and forest aggregate was extracted at the Gyeonggi-do and Gyeongsangnam-do, respectively. Land aggregate was mainly extracted at Gyeongsangbuk-do and Gangwon-do. Therefore, in the future supply and demand of aggregate resources, it is judged that there should be a primary policy direction for screening crushed and forest aggregate.

• Journal of the Korea Institute of Building Construction
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• v.17 no.6
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• pp.499-506
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• 2017

This study is to present empirical data about the needs for quality security of aggregate by randomly selecting aggregate from 4 major locations including A, B, C, D province in Korea, by investigating its quality status in terms of physical properties and particle distribution based on Korean industrial standards(KS). The test results indicated that wide variance in quality, and some of aggregate samples were far below the standard, still many of them are not satisfying KS standards. In addition, the current aggregate manufacturing process that does not include inspection of particle size distribution by sieving and fineness modulus, can induce a possibility of non-KS aggregate's distribution; this provide that the current status of aggregate quality security of Korea is seriously threatened. Thus, it is important to secure each aggregate's quality level under KS standards.

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.4
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• pp.229-235
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• 2018

In this study, recycled aggregate and natural aggregate were mixed in advance using an aggregate mixing facility that was developed to improve the quality of recycled aggregate concrete. Then the mixed aggregate was applied and concrete characteristics before and after a mix were considered. Based on the findings extracted, this study aimed to suggest a new direction for quality stabilization and application activation of recycled aggregate. The test results of change rates of mortars and coarse aggregates in fresh concrete mixed by a concrete mixer, before and after mixing aggregates showed that the variations of the mortars and coarse aggregates in the concrete mixed with the aggregates beforehand were decreased than those in the concrete before mixing them. The variation of compressive strength and the mean compressive strength at the ages of 3 and 7 days showed similar results before and after the aggregates were mixed, and the strength at the age of 28 days before and after mixing them showed larger deviation than that at the ages of 3 and 7 days. The use of the mixed aggregates after mixing aggregates beforehand reduced the variation in strength and is believed that it is advantageous for long-age strength development. The above results show that the variations of coarse aggregates and compressive strength in the concrete using the mixed aggregates produced by mixing recycled aggregates and natural aggregates beforehand are reduced so it will be possible to produce the homogeneous concrete by mixing aggregates beforehand.

• Economic and Environmental Geology
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• v.54 no.4
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• pp.427-439
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• 2021

On the base of the aggregate extraction statistics, this study tried to analyse the demand and supply of aggregate resources of each local government and provide directions for the stable and sustainable supply and demand of aggregate resources in the future. In 2019, aggregates were produced in 148 cities, about 65% of the 229 cities of Korea, but in 7 metropolitan cities with 74 local governments, only 19 cities developed the aggregate. It means that aggregate extraction is taking place in almost all regions in Korea. Sand and gravel were produced in 110 districts and 132 districts, respectively. By aggregate source, river aggregates were extracted in 4 local governments, land aggregates in 42 local governments, forest aggregates in 75 local governments, crushed aggregates in 105 local governments, and washing aggregates in 15 local governments. In other words, 81 district in Korea have not extracted land-based aggregate at all. 71 local governments produced only one type of aggregate, and 55 local governments developed two types of aggregate, and 22 local governments developed more that three types of aggregate. In 2019, the leading producing local government were, in descending order of volume, Ulju-gun, followed by Hwaseong-si, Cheongju-si, Pocheon-si, Paju-si, Yongin-si, Gimhae-si, Gwangju-si in Gyeonggi-do. 41 local governments have developed aggregates of more than 1 million m³, and the combined production of the 41 cities accounted for about 70% of national total. This shows that the aggregate extraction trend of local governments is becoming larger and more concentrated.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.11a
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• pp.265-268
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• 2009

전기로 산화 슬래그 골재는 철강산업의 부산물을 재활용한다는 측면에서 친환경적일 뿐만 아니라 고갈되고 있는 골재자원을 대체할 수 있다는 측면에서 중요한 가치를 지닌다. 본 연구에서는 다량의 철성분을 함유하고 있어 높은 밀도를 나타내는 전기로 산화슬래그 골재를 사용한 친환경 콘크리트의 횡구속 성능에 관하여 검토하였다. 이 실험에서는 전기로 산화슬래그 굵은 골재 및 잔골재를 적용한 콘크리트 공시체를 제작하여 천연 굵은 골재와 잔골재를 적용한 콘크리트의 횡구속 거동을 파악하였다. 실험변수는 콘크리트 제작에 사용한 골재의 종류, 횡보강에 사용한 나선 철근의 항복강도로 하였다. 실험결과 전기로 산화슬래그 골재를 사용하였을 경우 천연골재를 사용한 실험체와 유사한 횡구속 효과를 보였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.1350-1355
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• 2004

주택건설과 대규모 개발사업으로 인해 골재부족이 심화되면서 하천정비공사에서 골재채취가 주요한 사업이 되고 있다. 하지만 무분별한 골재채취는 하천생태계를 파괴시키는 원인이 된다. 본 연구는 하천에서 골재를 채취할 때 수생태계에 미치는 영향과 골재채취를 중지하고 휴식년제를 취할 때의 수생태계에 미치는 영향을 서로 비교${\cdot}$분석함으로서 하천골재 채취가 환경에 미치는 영향을 분석하였다. 연구방법은 수리학적 분석, 수질분석, 생태학적 분석을 이용하였다. 연구대상지역은 영산강의 일부구간으로 현재 이 구간은 골재채취공사가 진행중인 지역이다. 하상변동을 수치해석으로 모의한 결과 하상은 골재채취후 안정적으로 유지될 것으로 분석되었으며 골재채취가 수질에 미치는 영향은 그리 크지 않았고 단지 부유사(SS)가 약간 증가하였다. 생태학적 조사 결과 어류, 포유류, 양서류, 파충류와 조류는 공사로 인한 영향을 많이 받고 있는 것으로 분석되었다. 본 연구의 결과는 골재채취 사업에 따른 환경영향평가 및 사전환경성 검토에 활용될 수 있고, 하천공사와 수공구조물의 설계 및 유지관리 등에도 활용될 수 있을 것이다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.3
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• pp.253-260
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• 2017

The aim of research is to investigate various physical properties of ultra high strength concrete of 80MPa class using a combination of limestone aggregate and electronic arc furnace oxidizing slag aggregate. For aggregate combinations, granite and limestone are used for coarse aggregate, granite and limestone are also used for fine aggregate. And also, limestone fine aggregate is replaced by electronic arc furnace oxidizing slag aggregate of 25% and 50%. Test results indicated that flowability and compressive strength increased when limestone fine aggregate was used compared to that using granite fine aggregate due to higher modulus of elasticity by limestone. Also substitution of electronic arc furnace oxidizing slag aggregate resulted in a decrease of compressive strength slightly. It is found that the use of electronic arc furnace oxidizing slag aggregate and limestone aggregate would be favorable for reducing the autogenous shrinkage by as much as 9~25%.

• Magazine of the Korea Concrete Institute
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• v.9 no.5
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• pp.207-216
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• 1997

암석학적 특징이 다른 골재를 사용할 때 콘크리트의 기본특성에 영향을 골재품질 시험과 함께, 화학분석, X.R.D, D.T-T.G.A S.E.M, 편광현미경, 실체현미경관찰등을 하여 조사하므로서 암질특성과 콘크리트의 기본특성과의 관계를 해석하였다. 연구결과, 운모 또는 점토계 광물과 같은 풍화광물이 혼재하지 않고 거대 결정을 갖ㄴ 화강암계 골재는 풍화 화강암, 안산암, 석회암, 골재에 비해 골재품질이 저조해도 작업성이나 강도특성이 우수하였다. 이는 골재의 표면거칠기와 구형도가 양호해 골재와 시멘트페이스트의 부착력이 강화되기 때문이며 고강도콘크리트제조를 위한 골재의 암질로는 거대 결정으로 구성되고 풍화광물이 없는 암질을 선정하는 것이 중요하다. 결정이 크고 풍화광물(운모, 점토계 고아물)이 혼재되지 않은 화강암 골재를 사용한 고강도콘크리트는 석회암, 안산암 골재를 사용한 콘크리트에 비해 150-200kg/$\textrm{cm}^2$이상의 강도증진과 작업성이 향상되었다.