The Effect of Different Proportions of Aggregates in Self-Compacting Concrete

The purpose of conducting this study was to obtain Self Compacting Concrete with
different proportions of aggregate. The project was an experimental basis and requires
research to familiarize with Self Compacting Concrete. The project requirement was to
consider aggregates as important aspect. Material preparation was very critical as the
aggregates need to undergo the sieve analysis, soaking in the water for 24 hours and let it
dry for another 24 hours at room temperature to ensure the aggregates were saturated
surface dry. Admixture (VMA) and superplasticizer (HRWR) were to be added in SCC to
ensure stability and flowability of the SCC. The results was obtained and the all the trial
mixes could be considered as SCC from the results of Slump Flow Test and V-Funnel
Test. For the Segregation Index (SI), the results show improvement from trial mix I (0.5
CAlF A) until trial mix 4 (0.8 CAlF A). For the Compressive Strength Test ouly trial mix
4 (0.8 CAlF A) achieved the requirement of at least 28 MPa at 28 days. The reason was
due to different type of superplasticizer used. The. supetplasticizer need to be changed
until the desired strength of concrete could be achieved. From the results, it can be
concluded that SCC could be obtained nsing only admixtures and superplasticizer as the
agent to increase stability and flowability. 1he ratio of coarse aggregate to fme aggregate
that achieved the be~1 sec was 0.8. 11le most important thing was, the right
superplasticizer need to be used in order to achieve desired strength in Self Compacting
Concrete.