CD Skripsi
Sifat Mekanik Beton Geopolimer Abu Terbang Hybrid Dengan Pecampuran Portland Composite Cement
The use of Portland Composite Cement (PCC) as a substitute material in fly ash geopolymer hybrid concrete will accelerate the geopolymer reaction since the geopolymer becomes more reactive. In this study, the fly ash geopolymer hybrid concrete used 12 M NaOH concentration, modulus of silicate (Ms) 2.5 and 15% PCC cement, and extra water 80 kg/m3. Tests of mechanical properties carried out were compressive strength, tensile strength and flexural strength at 7 and 28 days. The results showed the compressive strength of geopolymer hybrid concrete against PCC concrete had a decreasing percentage of difference from 34,54% (6,68 MPa) at 7 days to 20,01% (4,49 MPa) at 28 days. Then, the percentage difference of tensile strength of geopolymer hybrid concrete against PCC concrete showed a slightly decreasement from 25,80% (0,48 MPa) at 7 days to 25,26% (0,60 MPa) at 28 days. Then, the percentage of flexural strength difference decreased from 31,09% (1,25 MPa) at 7 days to 28,55% (1,39 MPa) at 28 days. The tensile strength in the laboratory was greater than the tensile strength result of ACI 318-11 at 28 days and the flexural strength of geopolymer hybrid concrete in the laboratory was greater than the flexural strength obtained from SNI 2847-2013 at 28 days. It was because of fly ash had more effect on the increasing of flexural strength than the increasing of compressive strength geopolymer hybrid concrete. It was concluded that fly ash did not significantly affect the tensile strength of geopolymer hybrid concrete 28 at days.
Keywords : Mechanical properties, hybrid geopolymer concrete, PCC, room temperature.
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