Waterproofing Cinder Block Wall and CMU An aggregate instead of the sand or fine gravel used to be a true concrete blocks are usually make with volcanic pumice instead of cineder unless there is an nearby culetar coal fired power stons or cement kirn to supply pulverized cinders or fly ash.
Waterproofing Cinder Block Walls and CMU's as an aggregate instead of the sand or fine gravel used to make true concrete. blocks are usually made with volcanic pumice instead of cinder unless there is a nearby coal-fired power station or cement kiln to supply pulverized cinders or fly ash.