부산대학교 도서관

This research investigates the effect of groundnut shell ash (GSA) and calcium chloride (CaCl2) as partial replacement of cement in concrete. The replacement levels of OPC with groundnut shell ash (GSA) were 0%, 5%, 10%, 15% and 20%. 1% of Calcium Chloride was blended with OPC/GSA in all the test specimens except from the control mix. Concrete cubes of sizes 150mm x 150mm x 150mm were cast and cured in water for 7,14 and 28 days respectively. Slump test were conducted on fresh concrete while density test and compressive strength test was conducted on hardened concrete. The slump results revealed that the concrete becomes less workable (stiff) as the OPC/GSA and OPC/GSA/CaCl2 percentage increases. The compressive strengths result at 28 days shows that 0% have the highest strength of 24.29 N/mm2 followed by 5%GSA/1%CaCl2 (24.07 N/mm2), 10%GSA/1%CaCl2 (23.26 N/mm2), 15%GSA/1%CaCl2 (21.18 N/mm2) and 20%GSA/1%CaCl2 (19.56 N/mm2). Integration of 5%GSA+1%CaCl2, 10%GSA/1%CaCl2 and 15%GSA/1%CaCl2 can be used for concrete grade 20 while 20%GSA/1%CaCl2 replacement can be used for light weight concrete (grade 15). [ABSTRACT FROM AUTHOR]