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BOND STRENGTH AND MODULUS OF ELASTICITY OF ENGINEERED CEMENTITIOUS COMPOSITES

Odu Paul , Duku Erikole (2013) BOND STRENGTH AND MODULUS OF ELASTICITY OF ENGINEERED CEMENTITIOUS COMPOSITES. Universiti Teknologi Petronas.

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Abstract

The compressive strength of plain or conventional concrete is high, but plain concrete possesses a very low tensile strength, limited ductility and little resistance to cracking. New generations of concrete such as high strength concrete and ultrahigh strength concrete have been successfully developed. Although these new generation concrete have extremely high compressive strength, their tensile strength, ductility and resistance to drying shrinkage cracking have not been significantly improved which limits their use for structural applications. All current methods to improve the ductility and tensile strength of concrete members such as the addition of discontinuous discrete fibers to concrete during mixing, the use of reinforcement steel bars and restraining techniques are not cost effective. Established literatures show that Engineered Cementitious Composites (ECC) exhibits ductile behavior under uniaxial tension load. ECC has been repeatedly reported by different researchers to be characterized by high ductility, tight crack width control and exhibition of pseudo-strain hardening behavior with several percent tensile strains as compared to brittle and quasi-brittle behaviors for plain concrete and Fiber- Reinforced Concrete (FRC) respectively. Thus, the objectives of this project are: 1) to develop polyvinyl alcohol (PVA) fiber reinforced self-consolidating ECC, 2) to investigate the bond strength between the developed PVA-ECC and reinforcement bars and 3) to determine the Modulus of Elasticity of the developed PVA-ECC. To achieve the above project objectives, the following activities were performed: mixing / casting, curing and testing of 100 mm x 100 mm x 100 mm ECC cubes and ECC cylinders of heights 200 mm and 300 mm with diameters 100 mm and 150 mm respectively. The tests conducted include slump flow, Visual Stability Index, Vfunnel, L-box (for self-compacting concrete requirements), pull-out and modulus of elasticity tests. The values of slump flow, V-funnel and L-box measured in this project all satisfied the requirements for self-consolidating concrete (SCC). It has also been found out that the bond strength between reinforcing steel and ECC increases with increase in PVA fiber contents. The modulus of elasticity of PVAECC also increases with increasing PVA fiber content and increasing compressive strength of PVA-ECC.

Item Type: Final Year Project
Academic Subject : Academic Department - Civil Engineering - Structures, materials and construction
Subject: UNSPECIFIED
Divisions: Engineering > Civil
Depositing User: Users 2053 not found.
Date Deposited: 19 Feb 2014 11:26
Last Modified: 25 Jan 2017 09:39
URI: http://utpedia.utp.edu.my/id/eprint/13405

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