| Summary: | 碩士 === 逢甲大學 === 土木工程學系 === 104 === The primary purpose of this research is to improve the engineering properties of coconut shell lightweight concrete. In the master’s thesis by Li Keng-Hung of Feng Chia University titled A Study for Improving the Strength of Coconut Shell Lightweight Concrete [1] in 2011, it was found that coating coconut shells with waterproof glue could improve water absorption of the lightweight aggregate as well as particle strength.
This research instead adopted 3 different types of material of mortar, gypsum, and fly ash to coat coconut shell aggregate using a range of water-cement ratios. Physical properties were then analyzed for 3 types of materials to select an optimal water-cement ratio for coating purposes. The ACI 211.2 Weight Method was employed for the mixture designs to investigate the mechanical properties of low water-cement ratios of coconut shell lightweight concrete.
Test results of overall performance, in descending order, was fly ash > gypsum > mortar. Coconut shell lightweight concrete covered using fly ash had a pressure resistance strength of 210 kgf/cm2 to 231 kgf/cm2, achieving the standard requirements for concrete strength. Elastic modulus ranged from 42.68 GPa to 54.64 GPa which was far greater than standard coarse aggregate concrete. Cleavage strength ranged from 20 kgf/cm2 to 22 kgf/cm2, which also reached the standard requirement for lightweight aggregate concrete.
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