García-Berrios, Nitza M.

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Effect of fly ash and nanosilica on concrete compressive strength at early age
(2015) García-Berrios, Nitza M.; Suárez, O. Marcelo; College of Engineering; Cabrera, Mauricio; Dávila, Saylisse; Torres, Wandaliz; Department of Industrial Engineering; Mégret, Rémi
The decision making process in modern construction industry is challenging when recycle materials are required. One such approach is the replacement of cement by fly ash. Unfortunately, this replacement lowers concrete’s compressive strength at its early age. To counterbalance this loss, nanosilica is being utilized. The relationships among different components upon concrete fabrication require a design of experiments with mixtures to model concrete compressive strength. A single criteria optimization strategy was adopted to recommend mixture combinations that maximize the compressive strength. The results serve as a guide to control the additions of these mineral admixtures to design a material that withstands a desired level of compressive strength. The second stage of this work encompasses the use of a multiple-criteria optimization method to optimize several concrete performance measures simultaneously, namely concrete density, porosity, and compressive strength. This approach allows recommending mixtures that contain the mineral admixtures, in addition of conventional mixtures.