AGGREGATES TYPES ON PROPERTIES OF CONCRETE

ABSTRACT
This study revealed the substitute for conventional materials used in the
production of concrete. It involves the use of various aggregates like
laterite and quarry dust to replace conventional river sand fine aggregate.
The full replacement of granite as coarse aggregate in concrete with less
utilized local materials like bush gravel and limestone was employed.
Samples of concrete cubes were made using replacement cements of
laterite and quarry dust and samples of cubes made by using limestone
and gravel instead of granite. The quality of laterite and quarry dust as
replacement varied from 0%, 25%, 50%, and 75%, 0% being the control;
while granite was fully replaced to ascertain qualities of concrete using a
whole new material. A total of 68 cubes of standard 150 mm x 150mm x
150mm were cast from the various batches and cured in a water tank at
ambient temperature. The samples were cured for specified periods of 3
days, 7 days, 14 days and 28days Workability test (slump test) was carried
out to determine optimum water content noted at 0.5 water/cement ratio
for strength. It was observed that the weight of the specimen decreased as
the percentage of replacement for both laterite and quarry dust increased.
Bulk density of concrete reduced as replacement percentage for sand
increased; for coarse aggregates gravel gave the highest value of
2479kg/m3. Compressive strength test and flexural test were carried out
for the samples (cubes and beams respectively), and it was observed that
compressive strength for all sample batches increased as curing age
increased. Furthermore, observations showed for both laterite and quarry
dust replacement that compressive strength increased as percentage
replacement increased up to 25%. Thereafter, it decreased. Limestone
gave a better strength overall than granite and gravel as full replacement of
coarse aggregate with a value of 14.47N/m􀝉2.

Keywords:- Comparative Analysis Effects various Aggregates Properties
Concrete