As a way of converting agro-wastes into useful materials for the construction industry, this research considered the application of corn husk ash (CHA) as partial replacement for ordinary Portland cement (OPC) in the production of interlocking paving stones. The study investigated the oxide composition of CHA to ascertain its suitability as a pozzolanic material. Some properties of paving stones with CHA as a replacement for OPC were evaluated. The results showed that CHA is a good pozzolana having satisfied the required standards. The compressive strength of the specimens, with replacement levels ranging from 5 to 25% cured for periods of 3-56 days, was lower at early curing age but improved significantly at later age. Five percent (5%) replacement level showed increased strength compared to 0% CHA regardless of curing age. Density decreased with increasing CHA content, water absorption increased with CHA content, while abrasion resistance decreased with CHA substitution. The test results revealed that CHA paving stones at 5% replacement can attain higher strength than the conventional ones at longer curing periods due to its pozzolanic characteristics.
This study investigated the strength properties of Rice Husk Ash (RHA) concrete with shredded Polyethylene Terephthalate (PET) bottles as coarse aggregate partial replacement. Concrete mix, 1:2:4 was designed for all specimens with w/c of 0.5. Samples were prepared and examined at deferent replacement levels of cement with RHA (5, 10 and 15%) using shredded PET bottles (5, 10 and 15%) as coarse aggregate replacement. Concrete without RHA and shredded PET bottles served as control. A total number of 90 concrete cubes and 20 flexural beams were used to examine the strength properties of produced concrete specimens at 28 days. Results revealed that both compressive and flexural strengths of RHA-concrete decreased as the amount of shredded PET bottles increased. The compressive strengths obtained were 20.65, 17.44, 16.53 and 15.87 N/mm2 while the flexural strengths were 10.49, 6.63, 6.59 and 5.72 N/mm2 for 0, 5, 10 and 15% replacement levels respectively. This class of concrete could be used to produce both plain and reinforced concrete of light weight aggregate.
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