Document Type : Research Paper


1 Civil EngineeringDepartment, University of Technology - Iraq

2 Civil Engineering Department, University of Technology - Iraq


The use of recycled concrete aggregates (RCA) to replace part or
all of the natural coarse aggregates (NCA) in the production of concrete
has been on the increase. Such use helps in the protection of the natural
resources and in the reduction in the use o
f landfills.
The experimental
work consists of casting and testing ten rectangular simply supported
reinforced concrete beams of dimensions (1500*150*240) mm with
concentric point load at mid span as well as tests for control specimens to
determine the mechanical prope
rties of the concert. Five beams of these
ten beams were designed to fail in flexure and other five beams were
designed to fail in shear. Two beams were considering as a reference
beams using normal aggregate (NCA) and two beams were considering as
a refer
ence beams using recycled aggregate (RCA. The other six beams
were cast using recycled concrete aggregates (RCA) with steel fiber in
three different volumetric ratio (vf).The present investigation contains
three main variables: Coarse aggregate (normal and
reinforcement (with stirrups spacing 50 mm for flexure failure mode and
without stirrups for shear failure mode). Steel fiber (vf) = (0.5) %, (1) %
and (1.5) %.
In addition, constant longitudinal reinforcement ratio 0.012
al results have generally showed that ultimate loads (Pu) of
beams made with RA are approximately close to the results of beams made
with NA but with decrease of values (14% and 21%) for flexural and shear
behavior respectively.
The ultimate load of fibrou
s concrete beams is
greater than beams without steel fiber by
50%) for shear behavior
35%) for flexure behavior.


Main Subjects

[1] N. Lawson, I. Douglas, S. Garvin, C. McGrath, D.
Manning, & J. Vetterlein, “Recycling construction and
demolition wastes,” Environmental Management and
Health, A UK perspective, Vol. 12, No.2, 146-157, 2001.
[2] Kumar, B. Sarath Chandra, Vamsi Krishna
Varanasi, and P. Saha. “Sustainable development using supplementary cementitious materials and recycled
aggregate,” International Journal of Modern
Engineering Research (IJMER) 2.1, 165-171, 2012.
[3] S.C. Nelson, “High-Strength Structural Concrete with
Recycled Aggregates,” University of Southern Queensland,
[4] M. Mulheron “Demolition and Reuse of Concrete and
Masonry,” Proc. 2nd International RILEM Symposium,
products and standards in the U.K. Proc.Vol.2. Reuse of
demolition waste. Japan, 1988.
[5] C. S. Poon, D .Chan, “The Use of Recycled Aggregate
in Concrete in Hong Kong,” Resources Conservation &
Recycling, 2006.
[6] P. Lindsell, M. Mulheron “recycling of demolition
debris,” A report for the Institute of Demolition
Engineering, University of Oxford, Oxford UK, p, 233,