PENGARUH KOMBINASI AGREGAT KASAR ALINDAU DAN LOLI TERHADAP KUAT TEKAN BETON

ABSTRACT
Palu aggregate is an aggregate originating from Sulawesi Island. This
aggregate is not only used in the Palu and Sulawesi areas, but this coarse aggregate
is widely used in the East Kalimantan area, precisely in the city of Balikpapan.
Currently the source of hammer aggregate material is increasingly limited.
Alternative aggregates used by the community are the Alindau and Loli aggregates.
This research is a laboratory test of concrete structures. To conduct this
research, cylindrical concrete specimens with a height of 30 cm and a diameter of
15 cm are used to test the compressive strength of concrete. The subject of this study
was to use Alindau coarse aggregate with Loli coarse aggregate in the concrete
mixture to determine the compressive strength with the combination of aggregate
mixtures.
From the results of the compressive strength of concrete and its average at
28 days old, the value of the 100% Alindau mixdesign is still higher than the loli
aggregate mix design where the 100% Alindau mix design gets a K value of 350.21
kg/cm2 and the loli aggregate combination gets the result average K-337.68
kg/cm2. Where from these results that the combination of mixdesign alindau and
loli there is a decrease from mixdesign alindau 100% but these results are still
included in the compressive strength of K-300 kg/cm2 concrete. For concrete
compressive strength results of quality plan K-300 kg/cm2 with Alindau 100%
Aggregate material composition at 28 days of age get an average yield of K-350.21
kg/cm2, Alindau 90% get an average of K-340.93 kg /cm2, Alindau 85% obtained
an average K-336.29 kg/cm2, Alindau 80% obtained an average K-338.61 kg/cm2
, Alindau 75% obtained an average K-336.29 kg/cm2 , Alindau 70% obtained an
average of K-336.29 kg/cm2, the results of the compressive strength can be
categorized as still above the planned quality. The test results show a decrease in
the compressive strength of concrete with a combination of Alindau and Loli mixed
materials compared to aggregate materials Alindau 100% where the combination
of alindau and loli aggregate material has decreased by 5% compared to 100%
alindau aggregate.
Keywords: Alindau and loli aggregates, compressive strength of concrete