Written by Michael Van Kerckhove   

Engineering Characteristics of Recycled Concrete

Here is test data from an interstate highway project. Keep in mind every project/product will be different and you will need to address your specific situation accordingly.

Design: C/A Ratio: 7 Day 14 Day 28 Day
Flexual Comp 25% RCY
75% QRY
710 PSI
4600 PSI
760 PSI
NO DATA
760 PSI
5730 PSI
Flexual Comp 50% RCY
50% QRY
640 PSI
4560 PSI
690 PSI
NO DATA
700 PSI
5530 PSI
Flexual Comp 75% RCY
25% QRY
665 PSI
4700 PSI
690 PSI
NO DATA
800** PSI
6230 PSI
Flexual Target 650 PSI*            Final Design 75% RCY AGG

 

* DOT’s design specification
** In this scenario the greatest success was achieved with 75% recycled & 25% virgin coarse aggregate.