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슈미트 햄머법 비파괴 시험에 의한 현무암 골재를 사용한 콘크리트의 강도 평가
김상우 ( Kim¸ Sang-woo ),이백수 ( Li¸ Bai-shou ),이승석 ( Lee¸ Seung-seok ),류현기 ( Ryu¸ Hyun-ki ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
This paper is intended to provide the reference data on the standardization of nondestructive test of concrete using basalt aggregate produced in Cheju island. Compressive strength and rebound number of schmidt hammer are measured. Concrete using granite stone are also tested. According to experimental results, compressive strength of concrete using basalt aggregate is highly estimated compared to that using granite stone about 10~20% for same rebound number condition. It is urgently necessary to prescribe modified evaluation formular of compressive strength with schmidt hammer considering our condition because existing estimation formular provided in Japan underestimate the compressive strength of concrete using basalt aggregate.
PP섬유 혼입 및 횡구속재 변화에 따른 고성능 콘크리트의 폭열방지에 관한 실험적 연구
황인성 ( Hwang¸ Yin-seong ),이백수 ( Li¸ Bai-shou ),이병열 ( Lee¸ Byung-yul ),양성환 ( Yang¸ Seong-hwan ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
This study is an experimental study on the spalling resistance of high performance concrete with PP fiber contents and material for lateral confinement. According to the results, spalling occurs to all specimens that do not contain PP fiber and it is prevented in the specimens containing PP fiber by more than 0.05% after heating, so it shows good effect on the spalling resistance. Variation of material kind for lateral confinement, metal lath shows the best effect on spalling resistance, and glass fiber and carbon fiber do not show good effect on the spalling resistance due to reduction of bond strength by high temperature. While the residual compressive strength shows about 80% of its original strength in the specimen confined laterally by PP fiber contents and metal lath, it decreases a bit in the range of 50~60% of its original strength because of reduction of the bond strength.
현무암 골재를 이용한 콘크리트의 복합법 비파괴시험에 의한 강도 평가
김상우 ( Kim Sang-woo ),이백수 ( Li Bai-shou ),이승석 ( Lee Seung-seok ),류현기 ( Ryu Hyun-ki ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
In this paper, tests are carried out using concrete with basalt aggregate produced in Cheju island, in order to provide the combined strength evaluation method of concrete by applying the rebound number and ultrasonic pulse velocity based on the multi repression. Combined strength evaluation method of concrete using basalt aggregates are compared to that using granite aggregate. Compressive strength of concrete using basalt aggregate is highly estimated compared to that using granite aggregate under the same rebound number about 5~15%, and about 50~70% under the same ultrasonic pulse velocity. The kinds of aggregates have an significant influence on the combined strength evaluation method. Therefore, Standardization of nondestructive test fix compressive strangth of concrete produced in Cheju island is available by using the results of this study.
P형 슈미트햄머의 반발도에 미치는 시멘트 및 혼화재의 영향
김기정 ( Kim Ki-jeong ),이용성 ( Lee Yong Sung ),이백수 ( Li Bai Shou ),윤기원 ( Yoon Gi-won ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This study is intended to investigate the relationship between rebound value and the compressive strength with variation of kinds of cement and replacing ratio of admixture, as a series of the study about early strength quality control by P type schmidt hammer. According to the results, the compressive strength and the rebound value of P type schmidt hammer show high value in order of AMC, UHC, OPC, and in the case of AMC and UHC, they are very high at early age in comparison with that of OPC. In the case of concrete using BS, they are lower than that of plain concrete until 7 days, but are higher at the age of 28 days. In the case of concrete using FA, they is lower than that of plain concrete on the whole. As for estimation of the compressive strength, concrete using UHC is similar to OPC, but concrete using AMC shows some difference, so it is thought that consideration about this is necessary. Concrete using BS does not show difference with plain concrete as for estimation of the compressive strength, but in the case of concrete using FA, the compressive strength is estimated high by 18kgf/㎠ and 36kgf/㎠ at the same rebound value in the replacing ratio of 10% and 20% respectively.
이용성(Lee Yong Sung),김기정(Kim Ki-Jeong),이백수(Li Bai-Shou),윤기원(Yoon Gi-Won),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study is intended to investigate the relationship between the rebound value of P type schmidt hammer and compressive strength at early age(until 1day), synthesizing the studies on estimation of compressive strength by P type schmidt hammerby this time for confirming compressive strength of 5MPa at which side form can be removed. Regression formula between rebound value of P type schmidt hammer and compressive strength is shown as Y=0.00131 e2.5821m(X), and correlativity is favorable (coefficient of correlation 0.895). After analyzing the regression line as confidence coeffient(0.05) by estimate analysis, the allowance limit of y versus x is obtained. Rebound value of P type schmidt hammer, which compressive strength is more than 5MPa, shows 29, based on the lower limit of allowance limit. Therefore, if rebound value of P type schmidt hammer is more than 29, it is thought that compressive strength of concrete exceeds 5MPa under the condition of normal ready mixed concrete.
[제1분과/비파괴검사 및 계측기술] 콘크리트의 초기 압축강도 추정에 P형 슈미트햄머의 활용
김종(Kim Jong),이용성(Lee Yong-Sung),정덕우(Jung Duk-Woo),이백수(Li Bai-Shou),윤기원(Yoon Gi-Won),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper investigate the applicability of P type Schmidt hammer for estimating early age compressive strength of concrete using 320data, which are collected varying with mixture proportion and material condition. Based on the Logistic regression analysis, low strength is calculated under low rebound number of P type Schmidt hammer and high strength is estimated under high rebound number of P type Schmidt hammer. The estimation equation between rebound number and compressive strength is obtained as followings; y=55.ll/[1+exp(-6.810g(x)+11)](R²=0.9294) From the statistical consideration, rebound number of P type Schmidt hammer to estimate 5MPa of compressive strength. which is capable of removing the side form is found to 28.6 with significant level of 5%
슈미트햄머의 반발도와 초음파속도에 미치는 골재요인의 영향
김기정 ( Kim Ki-jeong ),이용성 ( Lee Yong Sung ),이백수 ( Li Bai Shou ),윤기원 ( Yoon Gi-won ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
This paper reports the influence of aggregate factors on estimation of compressive strength by non-destructive test. According to the results, in the case of basalt and limestone aggregate, the compressive strength and the rebound value of schmidt hammer is larger and smaller than in the case of granite aggregate respectively. And, as the influence of maximum size of aggregate, they are higher in the case of maximum size of 25mm than in the case of maximum size of 10 and 20mm. Ultrasonic pulse velocity is similar in the case of lime stone aggregate, but grows slow in the case of basalt aggregate compared with granite aggregate. But the influence of maximum size of aggregate on ultrasonic pulse velocity is minute. Estimating compressive strength by rebound hammer method, the same estimating expressions can be applied to the field since the kinds and maximum size of aggregate do not influence on estimation of compressive. But, as for estimation of compressive strength by ultrasonic pulse velocity method, compressive strength is estimated more highly by 10MPa in the case of basalt aggregate, but the influence of maximum size of aggregate is minute.
P형 슈미트햄머에 의한 초기 압축강도 추정에 관한 연구
이용성 ( Lee¸ Yong Sung ),김기정 ( Kim¸ Ki-jeong ),이백수 ( Li¸ Bai-shou ),윤기원 ( Yoon¸ Gi-won ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
This study is intended to investigate the relationship between the rebound value of P type schmidt hammer and compressive strength at early age(until lday), synthesizing the studies on estimation of compressive strength by P type schmidt hammerby this time for confirming compressive strength of 5MPa at which side form can be removed. Regression formula between rebound value of P type schmidt hammer and compressive strength is shown as K= 0.00131 e<sup>2.582ln(X)</sup> and correlativity is favorable (coefficient of correlation 0.895). After analyzing the regression line as confidence coeffient(0.05) by estimate analysis, the allowance limit of y versus x is obtained. Rebound value of P type schmidt hammer, which compressive strength is more than 5MPa, shows 29, based on the lower limit of allowance limit. Therefore, if rebound value of P type schmidt hammer is more than 29, it is thought that compressive strength of concrete exceeds 5MPa under the condition of normal ready mixed concrete.