Diseño y comparación de hormigón de alta resistencia utilizando dos tipos de microsílice en porcentajes de reemplazo del cemento, agregados de la cantera de Pifo y aditivo plastificante.

Abstract

This technical-experimental work aims to provide information on the influence of chemical and mineral additives in the manufacture of high-strength concrete mixes, through the preparation of tests in both fresh and hardened states. Aggregates from the Pifo deposits, located in Pichincha, Holcim cement type GU, additives such as the plasticizer "Sikament N-100", microsilica from the foundry "FUNDIRECICLAR", and microsilica “SF-100” from the company "BASF" were used. Once the concrete components were characterized, mix tests were carried out taking into consideration the indications of the ACI 211.4R-08 committee, where a series of readjustments in the dosage had to be applied, with the purpose of obtaining a mixture with the desired characteristics, to later add the chemical and mineral additives in different percentages and in this way observe if these additives react effectively with the concrete. By means of compressive strength tests at different ages, it was possible to demonstrate that the concrete containing an addition of 15% microsilica "SF-100" and plasticizing additive “Sikament N-100” at 3,5% of the cementitious material content was the most effective mix, exceeding without difficulty the design strength selected for this work (f'c=55MPa), and even surpassing the required compressive strength (f'cr) at the age of 90 days with a value of 79.8 MPa.