A study of the permeability and acid attack of corn cob ash blended cements |
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| Affiliation: | 1. Building Department, Obafemi Awolowo University, Ile-Ife, Nigeria;2. Civil Engineering Department, Ladoke Akintola University of Technology, Ogbomoso, Nigeria;1. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials and School of Materials Science and Engineering, the University of Jinan, Jinan, Shandong 250022, China;2. State Key Laboratory of Green Building Materials, Beijing, PR China;1. Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering, University of Sao Paulo, Duque de Caxias Norte Avenue, 225, Jardim Elite, 13635-900, Pirassununga, SP, Brazil;2. Central University of Las Villas, Department of Physics, Santa Clara 54830, Cuba;1. School of Environment, Science & Engineering, SCU, Lismore, NSW, Australia;2. Department of Civil Engineering, DCRUST Murthal 131039, Haryana, India;3. Center for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent Street, Bentley, WA 6102, Australia;4. Department of Civil Engineering, NIT, Agartala, Tripura, India;5. Department of Civil Engineering, MDU, Rohtak, Haryana, India |
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| Abstract: | The durability of concrete made with corn cob ash (CCA) blended cement was investigated in this study. Permeability and chemical attack involving H2SO4 and HCl were the key parameters considered. Nine classes of CCA blended cements were employed with the CCA content ranging from 0% to 25%. The 0% CCA replacement involved the use of normal ordinary Portland cement and it served as the control. The water absorption of blended cement concrete was performed using 100 mm cube specimens of mix proportions 1:1½:3, 1:2:4 and 1:3:6 with 0.5, 0.6 and 0.7 water-to-binder ratios, respectively. The chemical attack test was carried out using 50 × 50 × 15 mm mortar specimens of mix proportions 1:1, 1:2 and 1:3 with water-to-binder ratio ranging between 0.26 and 0.29. The results indicated that the use of CCA blended cement reduces the water absorption of concrete specimens. Optimal reduction occurred at 10% CCA replacement for 1:1½:3 and 1:2:4 mix proportions and at 15% CCA replacement for 1:3:6 mix proportion. The resistance to chemical attack was improved as the addition of CCA up to 15% replacement level, caused a decrease in permeability and reduction in weight loss due to reaction of the specimens with HCl and H2SO4 acid water. |
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