Effect of mix proportion and reinforcement size on the anchorage bond stress of laterized concrete

Lateritic soils, being locally available, have been one of the major building materials in Nigeria, and in most tropical countries in general. This paper reports the results of investigations carried out on the effect of mix proportion and size of plain round steel reinforcement on the anchorage bond stress characteristics of laterized concrete specimens. Laterized concrete is concrete in which some, or all, of the fine aggregate is from lateritic soils.

Sieve analysis of both the lateritic soils and the coarse aggregates used was carried out. Seven different bar sizes (6, 8, 10, 12, 16, 20 and 25 mm) which were cut into pieces 170 mm long to fit into the 150 cube mould were used. Also, three different mix proportions ( and 1:2:4) were used for the study. The results have shown that both the mix proportion and the size of reinforcement have a significant effect on the anchorage bond stress of laterized concrete specimens. The richer, in terms of cement content, the mix proportion, the higher the anchorage bond stress of laterized concrete. Also, the anchorage bond stress between plain round steel reinforcement and laterized concrete increases with increase in the size of reinforcement used.