Estudio de la resistencia a compresión del hormigón simple con reemplazo parcial de puzolanas obtenida de la calcinación de rastrojo de maíz

Abstract

In the present experimental work, the reduction of cement is investigated since it produces CO2 emanation in manufacturing, taking as an alternative a partial replacement with corn stover ashes for the production of simple concrete, with the purpose of increasing the resistance and thus reducing pollution. The corn stover was calcined at controlled temperatures between 500 to 750 degrees Celsius, the ash was obtained, the tests were carried out to know the physical and mechanical properties of the aggregates, corn stover ash and cement, using NTE INEN standards. It was shown that the materials were optimal, then the dosage was calculated for simple concrete and with 6, 8, 10 and 12 percent ash. 12 test tubes were made for each dosage for time intervals of 7, 14 and 28 days, giving us a total of 60 test tubes. The compression tests of the previously selected specimens were continued at 7, 14 and 28 days of curing. The concrete specimens with 6 percent ash presented positive results at 28 days as they reached a resistance of 256.77 Kg/cm2, which exceeds the resistance obtained from simple concrete of 246.00 Kg/cm2, in contrast, the resistance of 8, 10 and 12 percent with values of 210.93, 207.27, 206.89 Kg/cm2 respectively, had a significant decrease, these values do not reach the limit lower design resistance of 228 Kg/cm2. Finally, it was shown that the greater the amount of ash, the lower the strength of the concrete.