Mechanical strength of experimental mortars for plastering with partial addition of fly ash and hydrated lime

Abstract

Abstract In order to highlight the implementation of fly ash and hydrated lime in replacement of a % of the weight of the cementitious material traditionally used for the elaboration of mortar mixtures, a conventional mixture was made for mortars where the materials that compose this type of mixtures were previously selected, analyzed and implemented. The evaluations of the materials were carried out under the standards indicated by the Norma Técnica Colombiana that guarantee the reliability of the resulting mixture. The fly ash that was used was obtained from the power plant Termotasajero of the Municipality of San Cayetano located in the department of north Santander-Colombia. The hydrated lime was obtained in the municipality of Malaga located in the department of Santander-Colombia. The experimental mixtures presented a replacement of 40%, 50%, 60% and 70% of the weight of the cementitious material traditionally used in the city. At the same time, 10%, 20% and 30% of hydrated lime was added to the experimental mixtures in relation to the weight of the added fly ash. With each one of the elaborated mixtures, both traditional and experimental, 3 cubes were made as indicated in the Norma Técnica Colombiana for this purpose. After the 21 days of its elaboration to each one of the cubes their resistance to compression was determined by means of their respective test in the ibertest machine property of the Francisco de Paula Santander university located in the city of San Jose de Cucuta-Colombia. The data obtained in the tests were compared determining the viability of the addition of fly ash and hydrated lime in the mixtures for paste mortar, with the incorporation of a %. additional water in their designs. Thus generating a positive environmental, social and economic impact through the final disposal and marketing of an industrial waste, fly ash, and the use of a natural material, hydrated lime, in mixtures with cementitious matrix for mortars.