Crushed recycled concrete is a great candidate as base material under landscape synthetic turf, but is it good for use under pet installations? My answer is no. I do not recommend placing recycled crushed concrete under pet installations. Crushed recycled concrete is not made of aggregates alone. It is a combination of rock, sand, cement, and sometimes fly ash. When concrete is recycled and broken up, fine sand, cement, and other particles remain intact, bonded to the aggregates. These bonded materials can be very absorbent. Have you ever experienced an oil leak on a concrete driveway? They’re often impossible to remove. Poured-in-place concrete can be very absorbent in the same way, and when the concrete is broken up into smaller pieces, these particles are still part of the concrete and can absorb pet urine. When the crushed recycled concrete is contaminated with pet feces and/or urine, a disinfectant may be used to combat the uric acid in the pet urine which may cause odors.