Hollow concrete blocks are precast masonry units made out of Op Cement, aggregate, fly ash and concrete mix with 4 hollow cavities and are intended for use in the construction of both load bearing and non‐load bearing wall structures. One can use dry concreting method for manufacturing these hollow blocks using variotronic compaction which is a patented system involving state of the art vibration coupled with compression. These hollow blocks never disintegrate during their lifetime and deliver trouble free performance. It is very easy and fast to
conceal electrical and sanitary service lines within these hollow blocks. The tool required for conducting is double blade wall chaser.