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RISS 인기검색어
- 검색키워드
- 저자 : Habibur Rahman Sobuz (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Experimental study on long-term behaviour of CFRP strengthened RC beams under sustained load
Ahmed, Ehsan,Sobuz, Habibur Rahman Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.1
The strengthening and rehabilitation of reinforced concrete structures with externally bonded carbon fibre reinforced polymer (FRP) laminates has shown excellent performance and, as a result, this technology is rapidly replacing steel plate bonding techniques. This paper addresses this issue, and presents results deals with the influence of external bonded CFRP-reinforcement on the time-dependent behavior of reinforced concrete beams. A total of eight reinforced concrete beams with cracked and un-cracked section, with and without externally bonded CFRP laminates, were investigated for their creep and shrinkage behavior. All the beams considered in this paper were simply supported and subjected to a uniform sustained loading for the period of six months. The main parameters of this study are two types of sustained load and different degrees of strengthening scheme for both cracked and un-cracked sections of beams. Both analytical and experimental work has been carried out on strengthened beams to investigate the cracking and deflection performance. The applied sustained load was 56% and 38% of the ultimate static capacities of the un-strengthened beams for cracked and un-cracked section respectively. The analytical values based on effective modulus method (EMM) are compared to the experimental results and it is found that the analytical values are in general give conservative estimates of the experimental results. It was concluded that the attachment of CFRP composite laminates has a positive influence on the long term performance of strengthened beams.
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Experimental study on long-term behaviour of CFRP strengthened RC beams under sustained load
Ehsan Ahmed,Habibur Rahman Sobuz 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.1
The strengthening and rehabilitation of reinforced concrete structures with externally bonded carbon fibre reinforced polymer (FRP) laminates has shown excellent performance and, as a result, this technology is rapidly replacing steel plate bonding techniques. This paper addresses this issue, and presents results deals with the influence of external bonded CFRP-reinforcement on the time-dependent behavior of reinforced concrete beams. A total of eight reinforced concrete beams with cracked and uncracked section, with and without externally bonded CFRP laminates, were investigated for their creep and shrinkage behavior. All the beams considered in this paper were simply supported and subjected to a uniform sustained loading for the period of six months. The main parameters of this study are two types of sustained load and different degrees of strengthening scheme for both cracked and un-cracked sections of beams. Both analytical and experimental work has been carried out on strengthened beams to investigate the cracking and deflection performance. The applied sustained load was 56% and 38% of the ultimate static capacities of the un-strengthened beams for cracked and un-cracked section respectively. The analytical values based on effective modulus method (EMM) are compared to the experimental results and it is found that the analytical values are in general give conservative estimates of the experimental results. It was concluded that the attachment of CFRP composite laminates has a positive influence on the long term performance of strengthened beams.
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Flexural and Time-Dependent Performance of Palm Shell Aggregate Concrete Beam
Ehsan Ahmed,Habibur Rahman Sobuz 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.5
The use of Oil Palm Shell (OPS) as coarse aggregate is a cost-effective approach in the production of structural lightweight concrete. This paper investigates the flexural and long-term deflection performance of palm shell aggregate concrete beams. Both experimental and theoretical studies are carried out on 1.5 m long beams to investigate the structural performance. A total of nine beams having different mix ratios are tested in the laboratory under different service loading condition. Factors affecting the short and long-term deflections of palm shell aggregate concrete beams are highlighted in this paper. The experimental results are compared with the theoretical results. From the experimental investigation and theoretical analysis, it is concluded that cracked section under sustained loading showed larger deflection compared to that of uncracked section. The theoretical approach can give conservative estimate of the deflection provided the factors affecting the long-term performance of palm shell concrete beams are addressed.
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Experimental Study on Strength Gaining Characteristics of Concrete using Portland Composite Cement
Md. Alhaz Uddin,Mohammed Jameel,Habibur Rahman Sobuz,Md. Shahinul Islam,Noor Md. Sadiqul Hasan 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.4
This study deals with experimental investigation of strength gaining characteristics of concrete made with Portland Composite Cement (PCC) and Ordinary Portland Cement (OPC). Compressive strength of concrete is often considered as a measure to determine the rate of strength gain of concrete with age and different cement composition. Strength developments of five concrete types have been investigated in terms of cement content and curing duration. Experimental observations on 495 specimens reveal that the early age strength of PCC concrete is lower than that of OPC concrete. Based on the test results, lack of proper pozzolanic reaction in the presence of fly ash in PCC concrete strength is lower at early age. The pozzolanic activity of fly ash also contributes to the strength gain at later stages of continuous curing. This study also concludes that drying ambient conditions reduce the strength potential of PCC concrete as the secondary (pozzolanic) reaction fails to contribute to the development of strength.
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