Strength characteristics of medium workability ordinary Portland cement-rice husk ash concrete

摘要: Abstract Variation in strength of medium workability concrete was investigated when rice husk ash (RHA) replaces some the ordinary Portland cement (OPC). The strengths were 20, 25, 30 and 40 N/mm2. Compressive results obtained for mixes designed 28-day up to N/mm2 show that achieved, 40% replacement with RHA. For could not be achieved at 28 days, indicating values greater than may unless ages far beyond RHA is incorporated. Also mathematical relationships giving mix design parameters OPC/RHA established.