KAJIAN KUAT TARIK BELAH PADA PERENCANAAN BETON DENGAN ADDITIVE SILICA FUME MENGGUNAKAN METODA AMERICAN CONCRETE INSTITUTE (AGREGAT HALUS GUNUNG SUGIH DAN AGREGAT KASAR TANJUNGAN LAMPUNG)
Abstract: During the tensile
strength of concrete is very difficult to measure than concrete press. Your
analysis and experimental research on the use of additives such as Silica Fume and
Sikament-NN was conducted to determine the value of the concrete tensile
strength variation Silica Fume adding 0%, 5%, 10%, 15% and 20%. This study used
a sample test cylinder diameter of 15 cm and height of 30 cm were perfomed at
age 28 days and required 3 test specimens for each of the various levels of the
addition of Silica Fume and Sikament-NN. With the addition of Silica Fume 4
variation of 5%, 10%, 15% and 20% and Sikament-NN 0.5%, 1%, 1.5% and 2% of the
test specimen obtained a total of 27 units of the test specimen. The result
showed that the influence of Silica Fume on the concrete mix can increase kelecakan
concrete, it is influenced by particle shape Silica Fume smooth particles. The greater
the importance of the use of Silica Fume slump value is small, it is because of
Silica Fume absorbs water. On the use of Silica Fume 15% at 28 days of concrete
age obtained optimum tensile strength of concrete is 41.52 kg/cm2, but the
result have not yet reached the planned tensile strength that is equal to 60
kg/cm2. Use of Silica Fume as additive in concrete with cement replacement
levels of > 15% of the weight of cement can reduce the quality of concrete.
It is due to water absorption by Silica Fume too large so that the water needed
for the hydration is not enough lead into a low concrete strenght. From
table-NN Sikament addition of 0.5% and Silica Fume 15% at 28 days of concrete
to increase the strength of the highest (551.07 kg/cm2) compared to the
percentage that the addition of another 1%, 1.5% and 2% for the addition
Sikament-NN and 5%, 10% and 20% for the addition of Silica Fume, from research
and from the statements above show that the compressive strength of concrete
with the addition of Sikament-NN of 0.5% and Silica Fume for 15% was
recommended for use on a concrete plan when using additional materials as mentioned
above. Means it can be concluded the use Sikament-NN and Silica Fume should be used
to the extent of 0.5% and 15% and more of it is not effective anymore.
Penulis: Sari Utama Dewi
Kode Jurnal: jptsipildd160522
