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배정렬 ( Pei¸ Zheng-lie ),홍상희 ( Hong¸ Sang-hee ),고경택 ( Koh¸ Kyoung-taek ),김성욱 ( Kim¸ Sung-wook ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This study is intended to investigate the influence of expansive additive on the autogenous and drying shrinkage properties of high performance concrete that uses fly ash, blast furnace slag powder and silica fume. According to results, The length change ratio by the autogenous and drying shrinkage decreases remarkly with increase of mixing ratio of expansive additive, and decreases by 35% when mixing ratio of expansive additive is 5%. At the mixing ratio of expansive additive of 10%, the autogenous and drying decreases by 65% and 55% respectively. The autogenous shrinkage is also reduced largely in order of fly ash, silica fume and blast furnace slag powder, and drying shrinkage, in order of blast furnace slag powder and fly ash. Especially, compared with plain concrete, the autogenous shrinkage is reduced by 50% when using expansive additive of 5% and fly ash together.
배정렬,김은호,황인성,한천구 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.20 No.1
This paper is a fundamental study on the influence on the properties of high peformance concrete by mineral admixture. According to the results, while the fluidity decreases with the increase of replacement ratio of silica fume, it increases with the increase of replacement ratio of the other mineral admixture. Air content shows decreasing tendency with the increase of replacement ratio of fly ash, and the compressive strength of FA-SF2 shows the highest score. And the drying shrinkage increases with the increase of replacement ratio of fly ash, but it does not show much difference with the increase of replacement ratio of blast furnace slag powder. The autogenous shrinkage increases with the increase of replacement ratio of blast furnace slag powder, silica fume, while it decrease with the increase of replacement ratio of fly ash or combination of fly ash and silica fume. Therefore, it is thought that the fluidity, the placeability and the strength will be improved and the crack caused by autogenous shrinkage will be reduced by use of fly ash and silica fume together when making the high performance concrete.
배정렬,심보길,황인성,전충근,한천구 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
This paper presents the influences of mixing factors on the bleeding of concrete. Water to cement ratio(W/C), water content and S/a are varied with. According to test results, it shows that high W/C and water content, and low sand to aggregate ratio(S/a) increase bleeding of concrete. correlation between slump, slump flow and bleeding shows good agreement proportionally. We can not detect any correlation between air content and compressive strength, and bleeding. Accordingly, mixing adjustments to decrease W/C and water content, and increase S/a should be required in order to reduce bleeding of concrete.
문학룡,배정렬,한천구 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
This study discusses the influence of fineness of cement on the properties of cement mortar. According to the results, compressive strength shows a higher value in order of high early cement with 8000㎠/g of fineness(C), 4600㎠/g of fineness(B), 3000㎠/g of fineness(A) and ordinary cement(OPC) at mixture proportion of 1:3, and it does in order of C, B, OPC and A at mixture proportion of 1:1. Compressive strength shows a higher value in order of exposure at outside, standard and air curing with variation of curing condition. Flexural strength shows the similar tendency with compressive strength, and is about 1/7∼1/6 in comparison with compressive strength. And, its correlativity is above 0.93, so it is very favorable. Length change by drying shrinkage is higher in order of C, B, OPC and A at mixture proportion of 1:1 and 1:3.
시멘트 제조사 및 W/C 변화에 따른 콘크리트의 초기 강도발현 특성
金光華,裵正烈,김규도,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This study is to investigate the influence of cement manufacturing company and W/C on the properties of fresh concrete, strength of hardened concrete and rebound value of P type Schmidt hammer. According to the result, setting time of concrete is shortened with and increase of W/C, and when cement made in A and B corporation is used in concrete, the final setting time is measured at about 10 hours and 13 hours. Compressive strength increases with elapse of time and decrease of W/C, and concrete using cement made in A corporation shows higher compressive strength and rebound value until 24 hours, but from 3rd day, the contrary tendency is shown. As for the properties of early strength, the strength develop fast with decrease of W/C, and the time when compressive strength of 5MPa is gained and the form can be removed, is about 15, 18, 21 hours and 20, 22, 27 hours at the W/C 40, 45, 50% in concrete using cement made in A and B Co. respectively. The correlativity between compressive strength and the rebound value, which a coefficient of correlation is over 0.97, is very favorable. Therefore this method is effective to estimate the strength of removing the form.