Characterization of palm oil fuel ash and eggshell powder as partial cement replacement in concrete

• Published in: IOP conference series. Materials Science and Engineering 2018-10, Vol.431 (3), p.32002
• Main Authors: Khalid, N H A, Rasid, N N A, Mohd.Sam, A R, Lim, N H A S, Ismail, M, Zardasti, L, Mohamed, A, Majid, Z A, Ariffin, N F
• Format: Article
• Language: English
• Subjects: Age; Ashes; Calcium silicate hydrate; Cement; Compression tests; Compressive strength; Concrete; Fuels; Palm oil; X ray fluorescence analysis
• ISSN: 1757-8981; 1757-899X; 1757-899X
• DOI: 10.1088/1757-899X/431/3/032002

The utilization of palm oil fuel ash (POFA) and eggshell powder (ESP) in concrete as a cement replacement is possible as green concrete materials. However, the POFA has original cellulose and physical modification is needed. This paper presents the characterization of POFA; unground POFA (UPOFA) and ground POFA(GPOFA) and ESP under microstructure examination includes x-ray fluorescence (XRF), scanning electron microscopy (SEM), and particle size analyzer (PSA). Then, the POFA-ESP as a cement replacement in concrete was investigated. Optimum mix proportion of POFA-ESP concrete was determined from compression test and GPOFA-ESP and UPOFA-ESP were through further investigation on pozzolanic reaction under x-ray diffraction (XRD) test at 14 days-concrete age. It was found that the combination of GPOFA-ESP as a cement replacement produced a concrete enhanced the compressive strength than normal concrete. ESP in this study seems like a catalyst which acting as mild accelerator or booster to improve the early age of strength development without disturb the later strength development of concrete. In addition, combination of GPOFA-ESP could increase the C-S-H gel at early age of concrete. It can be concluded that the combination of GPOFA-ESP had dual function; ESP and GPOFA took at early and later strength development, respectively.