Professor of materials, Faculty of Engineering, University of Lagos, Yaba, Lagos,
Laterized concrete was defined as concrete in which “stable” laterite fines replace sand. Reinforced and unreinforced laterized concrete short columns of the same dimensions were cast from three mixes by weight and tested in axial compression after approximately 28 days. Strains were taken on steel and laterized concrete at about the mid-height of the columns. The maximum strain recorded on laterized concrete varied between 0.12 and 0.21% and that on steel varied between 0.12 and 0.20%. The ultimate loads of reinforced laterized concrete short columns were observed to be approximately the same as the ultimate loads for unreinforced laterized concrete columns of the same dimension as the reinforced columns.
Shear and cleavage modes of failure were recognized in unreinforced laterized concrete short columns; however, lateral reinforcement prevented the development of short vertical cracks that led to failure in the reinforced laterized concrete short columns.
The load factor for reinforced laterized concrete short columns is about 2. It is concluded that 1:2:4 mix by weight of laterized concrete may not be suitable for structural works because of the large deformation at initial cracking in all the columns cast from the mix. It is recommended that design practice of laterized concrete structures should be based on the conservative elastic method until more information is available about the behavior of the material.
Paper ID: JTE10674J