Shear Strength of Reinforced Fibrous-self Compacted Concrete Box Girder using Recycled Concrete Aggregate

Hadi, Mohammed A.; Sayhood, Eyad K.; Resheq, Ali S.

doi:10.30684/etj.v39i8.2100

	Shear Strength of Reinforced Fibrous-self Compacted Concrete Box Girder using Recycled Concrete Aggregate
Engineering and Technology Journal
Article 13, Volume 39, Issue 8, August 2021, Pages 1307-1320 PDF (1.77 M)
Document Type: Research Paper
DOI: 10.30684/etj.v39i8.2100
Authors
Mohammed A. Hadi^* ; Eyad K. Sayhood; Ali S. Resheq
Civil Engineering Department, University of Technology, Baghdad, Iraq.
Abstract
Protection of environmental and conservation of natural resources is a fundamental issue in today’s world. In this research, the shear behavior of reinforced concrete box girders with recycled aggregate (RA), steel fiber, and internal diaphragms were investigated. Eleven reinforced concrete box girders with typical longitudinal and transverse reinforcement were tested under two point loading until failure. The RA was prepared by crushing the collected waste of concrete from the laboratory test cylinders and cubes. The experimental variables considered include; RA percent of 50%, 75%, and 100%(replacing from NA), steel fiber with volumetric ratios (Vf) of 0.5%, 1.0%, and 2%, diaphragm numbers (two and three).The test results revealed that the shear strength of the box girders affected by the RA content, the ultimate load was decreased by (32, 25, and 19) % for the (100, 75, and 50) %RA concrete, respectively in compared with the control specimen. In contrast the steel fiber was more effective in strengthening of the RA concrete specimen, for the (Vf) of 0.5%, 1.0%, and 2.0% with non-fibrous 100% RA concrete, the strengthening were (25, 40, and 77) % respectively. Moreover, when 1.0% steel fibers added to the 100%, 75%, and 50%RA concrete respectively, the strengthening were (40 ,45 ,and48 )% compared each with its reference specimen. On the other hand, when two and three diaphragms used, the strengthening for the non-fibrous 100% RA concrete was (6% and 9%) respectively. cracking load, ultimate load, load- deflection, and concrete surface strain has been taken into consideration in this research.
Highlights
The recycled aggregate concrete mix shows decrease in the cylindrical compressive strength, splitting tensile strength, flexural strength, and elastic modulus of concrete. The RA has a significant effect on the load capacity of the box- girder without steel fibres. The test results showed that it is recommended to use Vf of 1.0% steel fiber with 100 % RA to retain the NA concrete strength for the shear box-girder.
Keywords
shear behavior; Box girder; Recycled aggregate; Steel Fiber; Internal diaphragms

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