STUDY MECHANICAL PROPERTIES AND DURABILITY HIGH STRENGTH SELF COMPACTING CONCRETE (HSSCC) WITH SILICA FUME SLURRY

• Main Author: Farhan Darmawan, Alif
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68370
• Institution: Institut Teknologi Bandung

Silica fume is a pozzolanic material that can improve the pore structure, mechanical properties, and durability of concrete. In this study, silica fume slurry was added to the concrete mixture with a w/c ratio of 0.25. Silica fume slurry was used as a cement substitute with a percentage of 5%, 7.5%, 10%, and 15%. For comparison, a silica fume powder was used with a percentage of 10%. Testing of mechanical properties included compressive strength testing at 7, 14, 28, and 56 days, while modulus testing was carried out at 28 days. Durability testing including porosity and abrasion testing, was carried out at 28 days, while RCPT (Rapid Chloride Penetration Test) testing was carried out at 28 days and 56 days. Microstructure testing including SEM and XRD was also conducted at 28 days and 90 days. Replacement of silica fume ranges from 5%-10% produced better mechanical properties compared to 15% silica fume replacement. In durability aspect, replacement silica fume slurry 5%-15% reduced the porosity up to 24-33%. Replacement silica fume slurry 5%-15% decreased chloride ion penetration by 56%-73%. Replacement silica fume slurry 5%-10% in the abrasion test has reduced by 2%-9%, while for silica fume powder has decreased by 3%. Replacement of silica fume of 15% leads to reduce strength, modulus, and abrasion of concrete. Replacement silica fume powder in terms of porosity and RCPT has better results than silica fume slurry. Correlation results show the relationship between compressive strength testing with SEM and XRD tests.