Browsing by Author "Tijani M.A."

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Compressive Strength of Concrete Using Sorghum Husk Ash and Calcium Chloride
(2020) Tijani M.A.; Ajagbe W.O.; Ayininuola G.M.; Dahunsi B.I.O.; Agbde O.A.
This paper investigated the effects of Sorghum Husk Ash (SHA) and Calcium Chloride (CaCl2) on the compressive strength of concrete. Concrete specimens were prepared by partial replacement of cement with SHA (5, 10, 15, 20 and 25% by weight) and addition of 1% CaCl2 by weight of binder; using a constant mix proportion (1:2:4) and water-to-binder ratio (0.6) for all mixtures. The properties evaluated were slump, density and compressive strength. The result indicated that addition of SHA reduced the slump (concrete turn out to be stiffer) and density of concrete. The 28 day compressive strengths result showed that 0%SHA/1%CaCl2 have the maximum strength of 28.11 N/mm2 followed by 5%SHA/1%CaCl2 (26.45 N/mm2), 10% (25.01 N/mm2), 0%SHA/0%CaCl2 (23.11 N/mm2), 15%SHA/1%CaCl2 (22.45 N/mm2), 20%SHA/1%CaCl2 (20.90 N/mm2) and 25%SHA/1%CaCl2 (18.13 N/mm2). This suggests that the best addition of SHA as fractional replacement for cement in CaCl2 concrete is in the range 0 - 20% since their compressive strength results were above 20 N/mm2 target strength. Incorporation of 1%CaCl2 together with 5 and 10%SHA would yield a concrete of greater compressive strength than standard concrete grade 20.
Strength and Absorption of Sorghum Husk Ash Sandcrete Blocks8
(2020) Tijani M.A.; AjagbeW.O.; Ganiyu A.A.; Aremu A.S.; Ojewole Y.N
Sorghum husk is one of the main agricultural wastes in milling processes that is available in large quantity in Nigeria. The available methods of handling sorghum husk have serious health and environmental implications. Hence, there is need for proper disposal of this agricultural waste. The chemical compositions of Sorghum Husk Ash (SHA) were determined using X-ray fluorescence analyzer. Production of sandcrete blocks by incorporating SHA as partial replacement for cement was investigated. SHA replacement levels of 1, 2, 3, 4 and 5% were used. A total of 54 hollow block specimens of dimension 450 × 225 × 225 mm were cast to undergo density, water absorption and compressive strength tests at 7, 14, and 28 days of curing respectively. Results revealed that percentage sum of silica, alumina and ferric oxide contents was 77.3% which exceeds 70% specified limit by ASTM C 618 for pozzolanic material categorization. The results also indicate that increase in SHA replacement (0 - 5%) led to decrease in density (2273.8 - 2185.4 kg/m3) and increase in water absorption (6.1 – 9.2%). The 28 day compressive strength increased by 1.5, 7.3, 20.8, 5.2 and 6.7% for 1, 2, 3, 4 and 5% SHA replacement respectively. It is concluded that SHA is a good pozzolan and can be used to improve the compressive strength of sandcrete blocks at satisfactory density and water absorption.