CD Skripsi
Sifat Fisik Dan Mekanik Beton Geopolimer Abu Terbang Dengan Tambahan Ordinary Portland Cement Di Air Gambut
Geopolymers are an alternative cement replace, made from industrial waste that is rich in silica and alumina, such as fly ash, palm oil fuel ash and husk ash. The geopolymeration bond can be activated by the activator solution and the curing system at high temperatures. This study utilizes fly ash as a geopolymer material and uses an innovative of ambient curing ease of application in the field with additional OPC. The objectives of this study were to assess the physical and mechanical properties of concrete such as setting time, workability, compressive strength, porosity, and tensile strength of concrete after curing and immersing in peat water for 7 and 28 days. This research method used trial mix with variation of NaOH concentration, modulus activatir and additional OPC (%). The result of trial mix composition of geopolymer concrete material using 12M NaOH concentration, modulus activator (Ms) 2 and OPC 15% addition of fly ash weight. Control variable in this research is conventional concrete OPC with quality of 20 MPa. The results show that OPC's additional fly ash geopolymer has high workability and faster setting time than OPC concrete. OPC porosity value of concrete is lower than geopolymer concrete, but OPC concrete has increased porosity value while geopolymer concrete decreases porosity in peat water. The compressive strength and tensile strength of geopolymer concrete increased by 27.74% and 25.53% immersing in peat water for 28 days, whereas OPC concrete decreased by 14.08% and 20.37%. Based on the test results it can be concluded that the OPC geopolymer concrete has a more stable physical and strength propertis compared to OPC concrete in the peat water environment. Keywords: physical and mechanical properties of concrete, fly ash geopolymer concrete,additional OPC, ambient curing, peat water.
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