The paper focuses on the effect which varying the type of sand used in concrete will have
on the compressive strength of concrete and seeks to determine the suitability of each sand for use
in concrete works. The sand samples used include Okhoro, Ikpoba, Ovia and Okhuahiaerosion
sands and Ikpoba, Ovia and Okhuahia river sands. Particle size distribution of the sands was first
determined and the result was used to design grades 20, 25, and 30 concretes to Department of
Environment (DOE) mix design method. Twelve cubes were cast from one particular sand sample
and three cubes were tested at 7, 14 and 28 days for each grade of concrete respectively .The result
revealed that the sand samples that are well graded gave the highest compressive strength; while the
poorly graded sands gave lower strengths. Okhuahia river sand gave the strongest concrete followed
by Ikpoba, and Ovia river sands, Okhuahia, Ikpoba, Ovia and Okhoro erosion sands. Particle size
distribution within a sand zone probably did not affect strength but the impurity content did.
However, the inter-zonal differences in particle sizes probably did affect strength. The result also
showed that only the river sands and Okhuahia erosion sand are good for concrete making.
Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials
