Abstract:
In this experimental study, recycled concrete was used on cylinder specimens,
the reinforced concrete beams, and the reinforced concrete slabs. Recycled concrete
made of waste material from laboratory experiment is used for fine and coarse
aggregates in this experiment. Cylinder specimens, beams, and slabs were used to
determine the mechanical properties such as compressive strength, shear strength, split
tensile strength, and flexural strength. Two mix designs with fc' = 25 MPa and Fc' = 20
MPa were used in this study.
Three different persentage variations of recycled concrete aggregates were used
in mix design with Ie' = 20 MPa. Firstly, it consists of 100% recycled coarse aggregates
(RCA) and 0% recycle fine aggregates (RFA). Secondly, it consists of 80% RCA and 20%
RFA, and thirdly, it consists of 60% RCA and 40% RFA. Nine reinforced concrete slabs
witli three variations of mix design were tested. The test results showed that the
mechanical properties such as compressive strength, split tensile strength, shear
strength, and flexural strength decreased when using more RFA. The flexural strength of
reinforced concrete slab showed that the yield and ultimate moment are close to each
other, but ductility decreased when the RFA Increased.
Three different persentage variations of coarse recycled concrete aggregates
(RCA) were used in mix design with Ie' = 25 MPa, which are 0%, 50%, and 100% of RCA.
The test results showed the characteristics of compressive strength values are: fc'=28.7
MPa and fc'=28.4 MPa for each of the mixtures of 50% and 100% RCA. The split tensile
strength values are: fct= 2.38 MPa, fct= 2.78 MPa, and fct= 2.81 MPa for 0%, 50% and
100% RCA. While the shear strength are: Fv= 5,55 MPa, fv= 4,28 MPa, and fv= 3.86 MPa
for 0%, 50%, and 100% RCA.
