Properties of concrete with dissimilar treated recycled coarse aggregate

The evaluation of concrete can be determined by destructive and non-destructive methods. In recent years construction industry started off using demolition waste in structural concrete and coarse aggregate cost has been reduced. Only by pre-treatment for recycled coarse aggregate, the concrete properties will increase. Thus, the recycled coarse aggregates were treated with mechanical scrubbing, sulphuric acid, and hydrochloric acid before being induced in concrete. There are six different concrete mixtures were cast from untreated and treated aggregates. The ratio used in the current study is 1:1.61:3.14.W/C ratio had arrived at 0.41. The slump test for controlled concrete with river sand and M-sand was 110 mm and 100 mm. For untreated recycled aggregate concrete, the value was reduced to 70 mm and it was improved by mechanical scrubbing treated aggregate concrete by 90 mm without the addition of extra water. Similarly, the Vee-bee consist meter test and compaction factor test results were reduced suddenly in the untreated aggregate concrete; it was improved by all treatment methods, especially by mechanical scrubbing techniques. The compressive strength for untreated aggregate concrete at 28 days is 16.83 N/mm² and it was improved by mechanical scrubbing by 22.68 N/mm².The strength was increased by mechanically treated aggregate concrete by 25.79% compared to untreated aggregate concrete. The rebound numbers in different treatments of RAC were improved by 12.5–26.31% at 28 days than RAC (UN). The ultrasonic pulse velocity in different treatments of RAC was improved by 8.17–22.82% at 28 days to RAC (UN).