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5∼13 mm 순환 굵은 골재 혼합 사용이 콘크리트의 기초적 특성에 미치는 영향
강병회 ( Byeong Hoe Kang ),정상운 ( Sang Woon Jung ),자오양 ( Yang Zhao ),황금광 ( Jin Guang Hwang ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2013 한국건축시공학회 학술발표대회 논문집 Vol.13 No.2
Consider about aggregate``s price, coarse aggregates from 13 to 25mm were widely used in ready mixed concrete company. But if only use 13 to 25mm aggregates in the concrete, gap grading problem would be occurred. When recycled aggregates from 13 to 25mm was used , continuous grading would increase the durability and strength for the concrete, meanwhile the construction waste materials would also be reused. In this paper, 5-13mm recycled aggregates was utilized, to analyse the fundamental properties for concrete, strength has been tested to evaluate the quality and reusing effect of the recycled materials.
유,무기 섬유 길이조 길이조합변 합변화에 따른 섬유보강 모르타르의 레올 레올로지 특성
강병회 ( Byeog Hoe Kang ),박용준 ( Yong Jun Park ),조만기 ( Man Ki Jo ),이건철 ( Gun Cheol Lee ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2014 한국건축시공학회 학술발표대회 논문집 Vol.14 No.1
In this study, Analyse about flowability for fiber-reinforud mortar has been focused. Organic and inorganic fibers with different length have been combinatiorly used. The results showed using combination length of the fibers decrease the flowability, comparing with plain, fracture styess has been increased, Results also showed when several kinds of fibers used together showed the highest fracture stress.
13mm 크기 순환 순환굵은골 굵은골재 치환이 콘크리트의 공학적 특성에 미치는 영향
강병회 ( Byeog Hoe Kang ),자오양 ( Yang Zhao ),박재용 ( Jae Yong Park ),조만기 ( Man Ki Jo ),한민철 ( Min Cheol Han ),한천구 ( Cheon Goo Han ) 한국건축시공학회 2014 한국건축시공학회 학술발표대회 논문집 Vol.14 No.2
The aim of this research is suggesting the method of obtaining well-graded aggregates for concrete replacing the recycled aggregate which size range is from 5 to 13 mm to currently used gap-graded natural aggregates which size range is only 13 to 25 mm. according to the tests results, the workability of concrete was improved with replacing the aggregates of 5 to 13 mm of size range because of compensating gap-grading. Furthermore, there was an improvement in compressive strength when the aggregates of 5 to 13 mm of size range was replaced because obtained well-graded aggregates contributed on increasing adhesiveness and filling internal pore system. Comparing replacing recycled aggregate to natural aggregate, there was no significant difference on the performances.
13mm 이하 순환굵은골재 치환이 콘크리트의 공학적 특성에 미치는 영향
한민철,강병회,Han, Min-Cheol,Kang, Byeong-Heo 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.1
The objective of this paper is to investigate experimentally the effect of the substitution of recycled aggregates under 13mm on the properties of the concrete using coarse aggregate with size of 13~25mm. Recycled aggregate under 13mm were substituted to the concrete ranged from 10% to 100%. To compare the properties with the case of recycled aggregate, crushed stone with smaller than 13mm was also substituted to the concrete by 20% and 40%. Test results showed that increase of recycled aggregate under 13mm resulted in the increase of slump and compressive strength compared with plain mixture, which was made with only aggregate with 13~25mm size. This is due to the dense gradation of aggregate in association with addition of relatively small particle. It is thought that the use of recycled aggregate under 13mm along with 30% contributes to the quality improvement of the concrete made with only 13~25mm aggregate. 본 연구에서는 현행 레미콘사에서 콘크리트 제조 시 13mm 이하 굵은골재의 부족으로 인한 품질저하가 발생하는 문제를 해결하기 위하여 13mm 이하 순환굵은골재를 치환하여 콘크리트의 제반특성을 검토하였다. 실험변수로 13mm 이하 순환 굵은골재를 13~25mm 굵은골재에 10~100%까지 치환사용하여 콘크리트의 품질에 대해 분석하였다. 실험결과 13mm 이하 순환 굵은골재 치환사용으로 유동성이 증가하였으며, 공기량은 골재간의 공극충전효과로 인해 감소하였다. 또한 골재간의 연속입도 구성으로 콘크리트 내부에 공극이 감소되어 강도의 향상과 건조수축이 감소하였다, 이상을 종합하면 13mm 이하 순환 굵은골재를 13~25mm 굵은골재만 사용한 콘크리트에 30% 내외 치환사용시 콘크리트의 품질이 향상되는 것으로 나타났다.