Browsing by Author "Fabiyi, J. S."

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    Hydration behaviour and infrared spectroscopy of pre-treatments effects on portland cement-eremospatha macrocarpa and laccosperma secundiflorum systems
    (Asian Network for Scientific Information, 2012) Adefisan, O. O.; Fabiyi, J. S.; McDonald, A. G.
    "The effects of cold water extraction, incorptation of calcuim chloride (CaCl2) and aluminium sulphate (AL2(SO4)3) on the setting time (tmax), maximum hydration temperature (Tmax), time ratio(tR) and surface chemistry of Eremospatha macrocarpa and Laccosperma secundiflorum particles mixed with Portland cement was investigated. The mixtures were placed in thermally sealed thermos flasks for 24h after which tmax, Tmax and tR were measured. The tmax,Tmax and tR were 12.4 and 11.9h, 59.1 and 58.3oC, 1:1 and 1.1, respectively for untreated E.macrocarpa and L.secundiflorum and ranged from 5.2 to 10.7h, 57.7 to 83.7 oC and 0.5 to 0.9, respectively when treated with cold water and chemical addictives. Cold water extraction and chemical addictive significanlty improved the hydration parameters of rattan-cement system. CaCl2 performed better as a chemical accelarator than Al2(SO4)3 while L. secundiflorum inhibited cement setting more than E.macrocarpa. Infrared spectroscopy showed that incorporation of CaCl2 to L. secundiflorum particles helped expose cellulose to advance participation thereby enlarging its surface area for interpretation networking with cement. "
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    Pre-treatment effects on hydration behaviour of cement bonded boards made from eremospatha macrocarpa and laccosperma secundiflorum canes
    (2012-09) Adefisan, O. O.; Fabiyi, J. S.
    "The effects of pre-treatments on the setting time (tmax) maximum hydration temperature (Tmax) and time ratio (tr) of two rattan species (Eremospatha macrocarpa and Laccosperma secundiflorum) particles mixed with portland cement were investigated. The untreated E. macrocarpa and L. secundiflorum had tmax, Tmax and tR of 12.4 and 11.9h, 59.1 and 58.3oC, 1.1 and 1.1, respectively while cold water treated E.macrocarpa and L.secundiflorum had tmax, Tmax and tR of 10.7 and 10.0h, 63.3 and 65.1oC, 1.0 and 0.9, respectively. CaCl2 pre-treatment E. macrocarpa and L. secundiflorum had tmax , Tmax and tR were 5.2 and 5.6h, 83.7 and 78.6 oC,0.5 and 0.5, respectively. Therefore, CaCl2 pre-treatment significantly served as an accelerator to improve cement hydration parameters better than cold water. Findings showed that L. secundiflorum inhibited cement setting more than E.macrocarpa due to its higher sugar content. "