Investigation of the effect of hydration development on the physical and mechanical properties of rice husk ash substituded cement mortars

Removal and storage of the waste by-product of industrial production in the world is a difficult condition but is known to a big problem in environmental pollution. One of the emerging rice production, rice is the shell of this waste. Occur in over 120 million tons of waste rice husk and rice husk ash is obtained from burning 30 million tons of rice. It is observed that the use of mineral additives in our country and the world are becoming increasingly widespread due to the positive effect of concrete and cement mortars on compressive strength. Especially, it is stated that environmental pollution is reduced with the evaluation of industrial waste so the environment and energy resources are protected. When the studies in our country and in the world are examined, it is observed that rice husk ash reduce permeability of concrete and consequently increases the compressive strength. In this context, for reference cement and cements with rice husk ash (0, 2,5, 5, 7,5, 10, 12,5, and 15% by weight) 2, 7, 28, 56 and 90 day standard cement tests and compressive strength determined. In addition, properties in the 28th development of hydration which are the critical period, as SEM, TG, XRD and FT-IR examined by using analysis techniques. In conclusion, the results obtained in this study compared with each other, instead of cement, rice husk ash replacing the reactions that occur are evaluated. As a result, while the water requirement and setting time was increased by the amount of substitution rate of rice husk ash, the amount of portlandit (Ca(OH)2) which released during hydration was decreased.