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3가지 방안을 이용한 콘크리트 초기재령특성 비교측정 연구
장일영(Jang, Il-Young),운영위(Yun, Ying-Wei),김성겸(Kim, Seong-Kyum),이강득(Lee, Kang-Deuk),손창호(Son, Chang-Ho) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
The uneven shrinkage strain during concrete hardening period is one of the main causes for structure cracking. Therefore, shrinkage monitoring during concrete early age is significant for controlling inner strain distribution by improving curing process, thereby ensuring the quality and safety of whole structures. In this paper, three different methods including using FBG embedded strain sensors with different temperature compensation technique (FBG temperature sensor or thermocouple) and KM embedded strain gauges are used to monitor concrete shrinkage during early age. The experiment results show that all the used method successfully grasp the early age shrinkage of concrete. And quality comparison among these three methods has been analyzed.
FBG 센서에 의한 고성능 콘크리트의 초기변형에 관한 연구
장일영 ( Il-young Jang ),운영위 ( Ying-wei Yun ),유정수 ( Jeong-su Ryu ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
For high performance concrete(HPC), due to its low water cement ratio and addition of mineral admixtures, pretty high autogenous shrinkage and thermal deformation occur at early age of HPC casting (especially before hardening), which may lead to early age cracking of HPC structures, and influence the durability of HPC. This paper has monitored the early age properties of HPC successfully by embedded FBG strain sensor. The results show that the deformation increases rapidly within the first day after HPC casting. And its value is up to 57 με, which is the 35% of two-week deformation (165 με). Considering the durability and permeability of HPC, first-day deformation is pretty high and can not be neglected. Also, FBG monitoring system has been used to measure early age deformation and temperature of HPC retaining wall simultaneously. Temperature compensation for FBG strain sensor is always necessary for accurate strain monitoring. The monitoring technique used here can be extended to concrete early age behavior monitoring in mass concrete structure with any size.
FBG센서를 이용한 초고층빌딩 초기재령 특성 모니터링 연구
장일영 ( Jang Il-young ),운영위 ( Yun Ying-wei ),김영근 ( Kim Young-gune ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
FBG temperature sensor and strain sensor has been used to monitoring shrinkage and temperature of high rise building in construction site in its casting early age. The test results indicate that this monitoring method is a practical method for monitoring concrete at very early age. And the experiment of concrete curing monitored by dual FBGs was carried out to test the feasibility of the temperature compensation technique.
FBG센서를 이용한 초고층빌딩 초기재령 특성 모니터링 연구
장일영(Jang, Il-young),운영위(Yun, Ying-Wei),김영근(Kim, Young-Gune) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
FBG temperature sensor and strain sensor has been used to monitoring shrinkage and temperature of high rise building in construction site in its casting early age. The test results indicate that this monitoring method is a practical method for monitoring concrete at very early age. And the experiment of concrete curing monitored by dual FBGs was carried out to test the feasibility of the temperature compensation technique.
3가지 방안을 이용한 콘크리트 초기재령특성 비교측정 연구
장일영 ( Jang Il-young ),운영위 ( Yun Ying-wei ),김성겸 ( Kim Seong-kyum ),이강득 ( Lee Kang-deuk ),손창호 ( Son Chang-ho ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The uneven shrinkage strain during concrete hardening period is one of the main causes for structure cracking. Therefore, shrinkage monitoring during concrete early age is significant for controlling inner strain distribution by improving curing process, thereby ensuring the quality and safety of whole structures. In this paper, three different methods including using FBG embedded strain sensors with different temperature compensation technique (FBG temperature sensor or thermocouple) and KM embedded strain gauges are used to monitor concrete shrinkage during early age. The experiment results show that all the used method successfully grasp the early age shrinkage of concrete. And quality comparison among these three methods has been analyzed.
용인 시공현장의 FBG센서를 이용한 콘크리트옹벽 초기재령 특성 모니터링 연구
장일영 ( Jang Il-young ),운영위 ( Yun Ying-wei ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
콘크리트 균열은 초기재령에서 특히 경화되는 시간동안 고르지 않은 수축으로 인해 발생한다. 그러므로 초기재령 동안의 콘크리트 수축과 온도변화에 대한 연구는 매우 중요하다. 첫째로 이 논문에서 기초적인 모니터링 원리와 FBG 센서의 장점을 소개 한다. 이때 FBG 온도센서와 변형률센서는 실제 건설현장의 콘크리트 옹벽 타설 초기의 수축률과 온도 모니터링에 사용되었다. 실험결과에서 이 모니터링 방법은 극초기재령의 콘크리트를 모니터링 하기에 매우 실용적인 방법임을 입증했다. 그러나 FBG 변형률 센서의 온도 변화는 배제하였다. 이 연구에서 사용된 모니터링 기술은 매스콘크리트 구조물의 변형률과 온도 모니터링에 확장하여 적용할 수 있다.