Pengaruh Variasi Tekanan pada Saat Pencetakan Paving Block dengan Penambahan 5% Berat Fly Ash terhadap Uji Kuat Tekan
Abstract: This research aims
to investigate the effect of compacting pressure variations with the addition
of 5 wt.% fly ash (Fa) on paving block (Pb) in the compressive strength test
base on SNI 03-0691-1996. Fa is obtain from waste material produced from coal
burning thermal power plant from Sijantang sawahlunto. The growing production of
Fa caused negative environmental impact, so that one of the solutions to
overcome that effects is to use the Fa as a raw material for paving block
mixture that can reduce the cost of raw material and increase its strength. The
fly ash composition in the paving blocks manufacture, that is: 0 wt.%, 5wt.% Fa
+ block paving material (cement and sand), pressure variation 55, 65, 75, 85
and 95 Kg/cm2 with a drying time for 35 days. The addition of 5 wt.% Fa in
paving block is taken based on the results of research conducted in 2013 by
using a variation of the composition of 0,5,10,15 wt.% Fa and obtained optimum
conditions at 5 wt.% Fa, while the optimal time drying 35 days is taken based
on the results of research conducted in 2014 by the drying time variation of 7,
14, 21, 28, 35 days. While the pressure used 75 Kg/cm2, so it is necessary to
study based on variations of pressure to get the optimum condition of the
paving blocks. Form of test specimens by SNI 03-0691-1996 with paving block size
of 20 cm x 10 cm x 6 cm. The test results showed The addition of 5 wt.% Fa
increases the compressivestrength when compared to 0 wt.% Fa. Optimal
compressive strength occurred in paving block compactingpressure 95 kg/cm2 in
the amount of 36.1 kg/cm2 with a quality that is used for road on the
composition 5 wt.% Fa and 0 wt.% Fa of 30.3 kg/cm2 with quality B parking area.
This is because the material fly ash contains oxide compounds that have
mechanical properties that are very good and and the size of the fly ash used
is very small so as to fill the voids between particles and reduce the porosity
of the paving blocks and the higher pressure causes the density of paving
blocks increases because bond between the particles is getting stronger. All
the results that have made the products meet the quality according to SNI
03-0691-1996.
Penulis: Nurzal, Edison,
Krisna
Kode Jurnal: jptmesindd160593
