Concrete Blocks with Concrete Filling

Concrete hollow blocks constructed with two through holes to form continuous vertical hole are ideal for concrete filling. These holes can be completely or partly filled with concrete during the process of construction itself. For this purpose, mixes with large size aggregates may be used. This provision will add greater strength to walls. It has been found from the tests that filling of hollow blocks with plain concrete will give basic strength approximately halfway between these for unfilled blocks and the solid blocks with the same quality of concrete.