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小口徑 코어에 의한 콘크리트의 壓縮强度推定에 관한 硏究
백병훈(Baik Byung-Hoon),송성진(Song Sung-Jin) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.1
This paper is intended to estimate the compressive strength of structure effectively by small size core that has merits such as easiness of non destructive test and exactness of coring test. According to the results, the compressive strength of core specimen decreases with decrease of diameter of the core. The compressive strength of core specimen decreases by 2% in Φ100㎜ core specimen, by 6.3% in Φ50㎜ core specimen and by 18.5% in Φ25㎜ core specimen, in comparison with that of standard specimen. And, the compressive strength of Φ50㎜ and Φ25㎜ core specimen decreases by 4% and 16% respectively, compared with Φ100㎜ core specimen, but the correlativity between standard and core specimen is very favorable. From this results, it is thought that the compressive strength will be estimated comparatively exactly if Φ50㎜ core specimen is applied with strength correcting coefficient considered.
백병훈(Baik Byung-Hoon),송성진(Song Sung-Jin) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
This study is intended to investigate the influencing factors on the compressive strength of core specimens such as mixture factors(W/C), material factors(kinds of cement, replacing ratio of admixture, kinds of aggregate and maximum size of coarse aggregate) and experimental factors. According to the result, as for the effect of W/C, the compressive strength of core specimen drops higher in W/C 45% than in W/C 55% in comparison with that of standard specimen, and as for kinds of cement, it does lower in the case of UHC and AMC than in the case of OPC, but the effect of admixture is very minute. The compressive strength of core specimen of concrete using basalt aggregate shows the similar tendency to that of granite aggregate, but decreases a bit in the case of limestone. The reducing ratio of the compressive strength of 25㎜ core specimen is least when the maximum size of aggregate is 10㎜. But the compressive strength of 50 and 100㎜ core specimen is almost not influenced by the maximum size of aggregate. As for the influence of drilling direction, when core specimens are obtained from the place parallel to placing direction, compressive strength of core specimens is higher than those perpendicular to placing direction. And considering drilling position, compressive strength of core specimen is higher at the edge of cubic specimen than at the center, and at the bottom of cubic specimen than that at the top. As h/d ratio increases and rotation speed of drilling machine goes up, compressive strength decreases, regardless of core diameter.
김기정 ( Kim Ki-jeong ),백병훈 ( Baik Byung-hoon ),윤기원 ( Yoon Gi-won ),한천구 ( Han Cheon-goo ),송성진 ( Song Sung-jin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
This paper is the experimental study on the comparison of the compressive strength between standard and core specimen for exact estimation of the compressive strength. According to the results, comparing standard with core specimen, 100mm core specimen shows the drop of the compressive strength by 6.1%, 43mm core specimen, by 14.8% and 24mm core specimen, by 26.6% respectively, so with decrease of the diameter of core specimen, the compressive strength decreases. Also the external specimen shows higher compressive strength than the internal specimen in 24mm core specimen. Through this study, the favorable correlation between standard and core specimen is confirmed Therefore, it is thought that if the coefficient of correction is applied, small caliber core will be used effectively for the quality control through the estimation of the compressive strength with little damage to concrete structure.
김기정 ( Kim¸ Ki-jeong ),한민철 ( Han¸ Min Cheol ),윤기원 ( Yoon¸ Gi-won ),백병훈 ( Baik¸ Byung Hoon ),한천구 ( Han¸ Cheon-goo ),송성진 ( Song¸ Sung Jin ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
This study is intended to suggest the estimating method of compressive strength by small size core and present the correcting method of compressive strength of core specimen to compensate for reduction of compressive strength by drilling core specimen. According to the results, compressive strength of φ 50mm core specimen decreases by 6.3% in comparison with standard specimen, and correlativity is favorable, so it is thought that though small size core is used, it is possible to estimate compressive strength exactly. Compressive strength of φ50mm core specimen also increases with a decrease of height diameter ratio. Through regression analysis between height diameter ratio and compressive strength ratio of core specimen, height diameter ratio, at which compressive strength of φ 50mm core specimen and standard specimen is identical, is 1.77. Therefore, if height diameter ratio of φ 50mm core specimen is 1.8 in consideration of safety ratio, compressive strength of φ 50mm core specimen can be used as compressive strength of structure without correction.
[제1분과/비파괴검사 및 계측기술] 코어공시체에 의한 콘크리트구조물의 압축강도 평가에 관한 문헌적 검토
한민철(Han Min-Cheol),김기정(Kim Ki-Jeong),백병훈(Baik Byung-Hoon),윤기원(Yoon Gi-Won),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper reviewed the method as to the core obtaining and interpreting compressive strength with each specification and investigated the results of core testing done by the authors. Compressive strength of core specimens exhibited a slight decrease compared with that of standard curing specimens by about 2%. Especially, the lower the region of compressive strength, the bigger the reduction gap of compressive strength between core and standard curing specimens. In 20~40MPa of compressive strength, strength compensation with 7~1.6% is needed and in 40~60MPa, 1.6~-1.8% is needed. According to most criteria as to core test, it is stipulated that the suspect concrete is considered structurally adequate if the average strength of the three cores, exceeds 0.85f'c and no individual strength is less than 0.75f'c. This may be due to the condition of obtaining samples, procedure for curing.
코어공시체에 의한 콘크리트구조물의 압축강도 평가에 관한 문헌적 검토
한민철 ( Han Min-cheol ),김기정 ( Kim Ki-jeong ),백병훈 ( Baik Byung-hoon ),윤기원 ( Yoon Gi-won ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
This paper reviewed the method as to the core obtaining and interpreting compressive strength with each specification and investigated the results of core testing done by the authors. Compressive strength of core specimens exhibited a slight decrease compared with that of standard curing specimens by about 2%. Especially, the lower the region of compressive strength, the bigger the reduction gap of compressive strength between core and standard curing specimens. In 20~40MPa of compressive strength, strength compensation with 7~1.6% is needed and in 40~60MPa, 1.6~1.8% is needed. According to most criteria as to core test, it is stipulated that the suspect concrete is considered structurally adequate if the average strength of the three cores, exceeds 0.85f’c and no individual strength is less than 0.75f’c. This may be due to the condition of obtaining samples, procedure for curing.
김기정(Kim Ki-Jeong),한민철(Han Min-Cheol),윤기원(Yoon Gi-Won),백병훈(Baik Byung-Hoon),한천구(Han Cheon-Goo),송성진(Song Sung-Jin) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study is intended to suggest the estimating method of compressive strength by small size core and present the correcting method of compressive strength of core specimen to compensate for reduction of compressive strength by drilling core specimen. According to the results, compressive strength of Φ50mm core specimen decreases by 6.3% in comparison with standard specimen, and correlativity is favorable, so it is thought that though small size core is used, it is possible to estimate compressive strength exactly. Compressive strength of Φ50mm core specimen also increases with a decrease of height diameter ratio. Through regression analysis between height diameter ratio and compressive strength ratio of core specimen, height diameter ratio, at which compressive strength of Φ50mm core specimen and standard specimen is identical, is 1.77. Therefore, if height diameter ratio of Φ50mm core specimen is 1.8 in consideration of safety ratio, compressive strength of Φ50mm core specimen can be used as compressive strength of structure without correction.
김기정,백병훈,한천구 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
This study is to analyze the influencing factor of materials of concrete such as the kinds of cement, admixture, the kinds of aggregate and a maximum size of coarse aggregate on estimation of compressive strength by small size core statistically. According to the results, compressive strength of core specimen is lower than that of standard specimen, and as the diameter of core specimen grows' small, it decreases. Carrying out estimation analysis for regression line of compressive strength and calculating confidence limit by significance level 0.05(confidence rate 95%), we evaluate validity of the influencing factor of materials. Based on the analysis, it proves that the influencing factors of materials do not influence on estimation of compressive strength by core specimen significantly.