The potentials of pennisetum purpureum ash as cement replacement material

Nik Pa, Nik Nadia Amira (2019) The potentials of pennisetum purpureum ash as cement replacement material. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Cement production requires non-renewable natural resources that will be depleted in coming years. An alternative needs to be found to promote sustainable development for the construction industry. Therefore, this study introduced Pennisetum Purpureum ash (PPA) as a natural pozzolan. Limited information was published on the influence of PPA particle size in cement products. Therefore, this study investigated the physical and chemical properties of PPA as a cement replacement material and the effects of particle sizes of PPA with different replacement percentages on compressive strength and water absorption of cement mortar. The morphology of mortar containing PPA was also analysed. The PPA was prepared through controlled burning and grinding process before going through particle size analysis, XRF and SEM. The PPA used were ground for 1 hour (1H-PPA), 3 hours (3H-PPA) and 6 hours (6H-PPA) while the percentage of replacement in mortar were 5%, 10%, 15%, and 20%. The mortar was cured for 3, 7 and 28 days for mechanical properties characterisation. It was found that the particle size of PPA decreased as the time of grinding increased, which also increased the surface area. The particle size for 1HPPA, 3H-PPA and 6H-PPA were 9.30μm, 10.25μm and 10.58μm respectively. The total reactive oxides for 1H-PPA, 3H-PPA and 6H-PPA were 38%, 37% and 41.1% respectively while the loss on ignition were above 5%. As a conclusion, the grinding process degraded the honeycomb-like PPA structure into smaller particle size with highly irregular shape but in better dispersion. The 15% replacement of 6H-PPA mortar at 28 days showed the significant performance (30.07 N/mm2 of strength) with increment strength by 43.74% compared to control mortar with the lowest water absorption rate of 8.2%.

Item Type: Thesis (Masters)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Civil Engineering and Built Environment > Department of Civil Engineering : Structural and Materials Engineering
Depositing User: Mrs. Sabarina Che Mat
Date Deposited: 11 Aug 2021 04:24
Last Modified: 11 Aug 2021 04:24
URI: http://eprints.uthm.edu.my/id/eprint/614

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