• Title/Summary/Keyword: 골재원

Search Result 180, Processing Time 0.03 seconds

Evaluation of Aggregates Properties Depending on Producing Sectors and Regions in Korea (전국 골재산지 권역별 콘크리트용 골재의 물성 평가)

  • Han, Min-Cheol;Lee, Jun-Seok
    • Journal of the Korea Institute of Building Construction
    • /
    • v.17 no.6
    • /
    • pp.499-506
    • /
    • 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.

Analysis of Domestic Aggregate Production of Korea in 2019 (II) - by Local Governments (2019년도 국내 골재 수급 분석 (II) - 시군구단위 분석 -)

  • Hong, Sei Sun;Lee, Jin Young
    • Economic and Environmental Geology
    • /
    • v.54 no.4
    • /
    • pp.427-439
    • /
    • 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.

The Current Status of Aggregate Industry in Korea (우리나라 골재산업의 현황)

  • Oh, Jae-Hyun
    • Resources Recycling
    • /
    • v.25 no.4
    • /
    • pp.80-86
    • /
    • 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.

The Material Properties on the Crushing Effect of Recycled Aggregates (파쇄횟수가 순환골재의 품질특성에 미치는 영향)

  • Won, Chul;Park, Sang-Joon
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.5 no.1
    • /
    • pp.125-130
    • /
    • 2010
  • It is necessary to re-establish the code and to control the quality of the recycled aggregate itself for ensuring the useability of the recycled aggregate using waste concrete. Generally, adhering mortar cause of the water absorption ratio increment and strength decreased at the surface of the aggregate of the recycled aggregate using waste concrete, thus removing the adhering mortar could increase the useability of the recycled aggregate in the concrete industry. In this study, as a quality control method of the recycled aggregate using waste concrete, the quality characteristic of the recycled aggregate according to the mixing proportion between the recycled and the natural aggregate is obtained Therefore, a system is established to reuse the recycled aggregate in the construction industry.

  • PDF

Basic Experimental Properties of Concrete using Waste Concrete as Aggregate (骨材로써 廢콘크리트를 사용한 콘크리트의 基本的인 實驗 特性)

  • 구봉근;나재웅;신재인;박재성
    • Resources Recycling
    • /
    • v.10 no.1
    • /
    • pp.16-24
    • /
    • 2001
  • In this study, various mechanical properties of concretes employing waste concrete as aggregate were examined. These concretes were obtained by mixing seven types of aggregate for different ratios. So, the experimental variables are the kinds of aggregates (some different aggregate compositions) and W/C ratio (0.40, 0.45, 0.50). From experimental results, the reliable regression analysis equations between compressive strength and various experimental data for recycled aggregate concrete are presented. Consequently, this study was accomplished to investigate basic engineering properties of recycled aggregate concrete using waste concrete.

  • PDF

Study on the Distribution Status of Construction Aggregates in Incheon Metropolitan City and Nearby Areas (인천광역시 및 인근 지역의 건설용 골재 유통현황 분석 연구)

  • Chul-Seoung Baek;Byoung-Woon You;Kun-Ki Kim;Yu-Jeong Jang;Jin-Young Lee
    • Economic and Environmental Geology
    • /
    • v.57 no.2
    • /
    • pp.219-231
    • /
    • 2024
  • A survey of concrete plants in Incheon Metropolitan City and Gyeonggi Province was used to conduct an analysis of aggregate transport distance and production forms, as well as to evaluate the features and current status of aggregates distribution. As a result, areas such as Incheon, Siheung, Bucheon, Gimpo, and Siheung, where the distance to the demand points is less than 20 km, exhibited bidirectional distribution whereas Paju, Yongin, Yangju, and Pocheon, with distances ranging from 20 to 50 km is showed a unidirectional distribution pattern supplying aggregates exclusively to Incheon. Survey on manufacturing forms, more than 85% of the gravel dispersed in the Incheon area is made up of crushed aggregates derived from rocks discharged at construction sites indicating a considerable skew in supply chain. These findings are predicted to have a detrimental influence on aggregate supply in the long run, necessitating policy changes targeted at building an optimal aggregate distribution market.

Influence of the Type of Fine Aggregate on Concrete Properties (잔골재 종류가 콘크리트의 물성에 미치는 영향)

  • Koh, Kyung-Taek;Ryu, Gum-Sung;Yoon, Gi-Won;Han, Cheon-Goo;Lee, Jang-Hwa
    • Journal of the Korea Concrete Institute
    • /
    • v.18 no.4 s.94
    • /
    • pp.459-467
    • /
    • 2006
  • Recently, interest grew on the quality of aggregates following the diminution of primary resources from river as to grow construction demand and the low grade of nature sand like sea sand. Following, need is to diversify the supply sources of fine aggregates which are excessively relying on sea sand and urgency is to find as soon as possible aggregate resources that can substitute sea sand. On the other hand, various fine aggregates are utilized to produce concrete in the domestic construction fields. However, few studies have been systematically investigated on the effects of such fine aggregates on concrete properties. Therefore, this study examined the effects of comparatively widely used fine aggregates in the domestic construction fields on the quality of concrete through the analysis of the effects of such fine aggregates on the physical properties of fresh concrete and strength of hardened concrete. Results revealed that crushed sand degraded the fluidity and air entraining of concrete compared to natural aggregates like sea sand and river sand. Especially, the use of crushed sand exhibiting bad grain shape and grade was larger adverse effect on the physical properties of concrete. The type of fine aggregates appeared to have negligible influence on the strength for W/C of 55%, 45% while crushed sand decreased the strength for W/C of 35% compared to natural aggregates. It analyzed that the combination of crushed sand exhibiting bad grain shape and grade with natural aggregates improved the characteristics of fresh concrete and had negligible influence on the strength.

A Study on Strength Development and Drying Shrinkages of Recycled Concrete (재생콘크리트의 강도발현 및 건조수축 특성연구)

  • 이진용
    • Magazine of the Korea Concrete Institute
    • /
    • v.9 no.6
    • /
    • pp.217-223
    • /
    • 1997
  • 재생콘크리트의 압축강도와 휨강도는 재생골재의 혼입량이 증가할수록 감소하였으며 플라이애쉬를 혼화재로 사용할 때 그 양이 증가할수록 재생콘크리트의 조기 압축강도는 떨어졌다. 골재원에 따른 압축강도는 재생골재의 혼입량이 적을수록, 양생기간이 길어질수록 증가하엿으나, 전반적으로 비슷한 강도변화의 경향을 보여주고 있다. 재생콘크리트의 휨강도 발현은 보통 콘크리트와 비슷하나, 휨강도에 대한 압축강도비는 보통 콘크리트에 비하여 낮았다. 재생콘크리트의 건조수축은 재생골재의 혼입량이 증가할수록 증가하였으며 , 특히 재령2주와3주사이에 건조수축량이 보통 콘크리트에 비해 월등히 높았다.

Basic and Strength Properties of aggregates from Various locations in sud-Korea (국내 남부지역의 골재원 변화에 따른 보통콘크리트의 기초 및 강도특성)

  • Jo, Man-Ki;Song, Yuan-Lou;Park, Young-Jun;Lee, Hong-Kyu;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2015.11a
    • /
    • pp.145-146
    • /
    • 2015
  • When using non KS aggregate muck pile in general, compared to when using KS aggregate, when obtaining an identical slump a high unit quantity of water was confirmed, and when designing the concrete mix the compressive strength of concrete decreased due to an increase in W/B. Therefore because the use of non KS aggregate decreases the liquidity, strength and durability etc. qualities of concrete from an overall performance point of view, there is a need for the used of KS aggregate and when using aggregate that does not adhere to KS standards, it is determined there is a need for appropriate concrete mix design and care.

  • PDF

The Influence of That Changes in Aggregate Material and Unit Binder Weight Have on the Material Properties of Regular Strength Concrete (골재원 및 단위결합재량 변화가 일반강도 콘크리트의 물성에 미치는 영향)

  • Park, Yong-Jun;Kim, Sang-Sub;Lee, Myeong-HO;Jo, Man-Ki;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2015.11a
    • /
    • pp.17-18
    • /
    • 2015
  • In the case of concrete recently manufactured with a concrete mixing truck, although aggregate and cement are used as the main ingredients, from a costs savings perspective, low quality aggregates are processed and used as concrete aggregate. In the case of these low quality aggregates, the unit volume and unit binder weights are increased for manufacturing, and due to this problems such as dry shrinking of the architecture and economic infeasibility have arisen. Therefore by changing the aggregate material and the unit binder weights that are currently being distributed, this research analyzes the influence on concrete.

  • PDF