RECYCLED AGGREGATE HIGH-STRENGTH CONCRETE

The use of recycled aggregates from demolished constructions as a coarse aggregate for concrete becomes a need to reduce the negative effects on the environment. This study aims to study the effect of using recycled materials (such as crushed concrete, crushed ceramic and crushed red brick) as coarse aggregate for high-strength concrete on the main properties of high-strength concrete. Also, the behavior of reinforced beams cast using that type was studied to investigate their behavior in terms of the deflection, strain values, initial cracking load, crack pattern and ultimate loads. Main variables are recycled aggregate type (recycled crushed concrete, crushed ceramic and recycled crushed red brick), replacement ratio (as 25%, 50%, 75% and 100% from dolomite as coarse aggregate), age of test (after 7, 28 and 56 days). The test results showed that high-strength concrete made with recycled aggregate behave in a similar manner as that made with dolomite as aggregate. Also, a decrease in the range of about 13.1-67.2%, 17.6-72.0%, 24.3-74.6% and 6.5-71.1% for compressive, splitting tensile, flexure and bond strengths and bond strength compared to that cast using dolomite.