PENGARUH PENGGUNAAN FLY ASH PADA BETON MUTU NORMAL DAN MUTU TINGGI DITINJAU DARI KUAT TEKAN DAN ABSORBSI

Abstract

Fly ash was used in K300 quality and K500 concrete. To find out pressure strength and
absorption, there used cube test with 15 cm measurement. Concrete mixture planning used method
of DOE (development of Environmental). In K300 with FAS 0.63, slump 3 cm – 6 cm and in K500
with FAS 0,41, slump 8 cm - 12 cm. by fly ash variances 0%, 30% cementious and 30% additive
from the total weight of cement. The pressure strength test was done when the concrete age was
7, 14 and 28 days. Absorption was tested when the concrete age was 28 days.
In this research, concrete with strength K300 and strength K500 showed similar reaction in all
variances of concrete mixture. Fly ash as additive was better compared with its role as cementious.
Since both tester showed increasing in concrete pressure for 10% from concrete without fly ash.
And fly ash as cementious showed decreasing in concrete pressure for 10% from concrete without
fly ash, where the avarege of pressure in K300 was 362 kg/cm2 for concrete without fly ash, 273
kg/cm2 for concrete with 30% cementious and 398 kg/cm2 for concrete with 30% additive. And
for K500 concrete were 568 kg/cm2 for concrete without fly ash, 443 for concrete with 30%
cementious and 628 kg/cm2 for concrete with 30% additive. And absorption in strength K300 was
0.384% for concrete without fly ash, 0.379% for concrete with 30% cementious and 0.363% for
concrete with 30% additive. And also in strength K500 with 0.276% for concrete without fly ash,
0.274% for concrete with 30% cementious and 0.259% for concrete with 30% additive.

Keyword : ly Ash, Absorption, Cementious, Additive