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Title: Effect of construction joints on the modulus of rupture
Authors: Raad, Bashir S.
Altaki, Fadi M.
Advisors: Gerges, Najib N. 
Subjects: Concrete beams--Testing
Issue Date: 2012
The purpose of this study is to correlate the compressive strength (fc) of concrete to the modulus of rupture (R) for a non-reinforced test beam with a construction joint placed at the center. The testing was performed according to the ASTM standards. The current ACI code suggests a formula for the correlation of R to fc, given that the concrete specimen is monolithic (no joints). Given the fact that no concrete structure is built without the use of construction joints, whether planned or un-planned, an engineer would definitely benefit from an equation that could relate the flexural strength of concrete (modulus of rupture) in function of its compressive strength. In addition to that, it would also prove useful to know how much flexural strength is being reduced in the existence of a construction joint. The aim of this paper is to show that the amount of flexural strength reduced in the presence of a construction joint is not as significant as most engineers believe. Due to that belief, most engineers tend to add tremendous amounts of steel reinforcement at the joints to compensate for this reduction. Hopefully, a better understanding of the effects of a construction joint on the modulus of rupture will assist structural engineers in their design calculations, thus reducing the amount of steel reinforcement at the joints, which in turn will lead to ultimate cost savings on a large-scale project. This is what value engineering is all about.
Includes bibliographical references (p. 33).

Supervised by Dr. Najib Gerges.
Rights: This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the personal and educational use exceptions must be obtained from the copyright holder
Ezproxy URL: Link to full text
Type: Project
Appears in Collections:UOB Theses and Projects

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