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Self-Compacting Concretes Using Fly Ash and Fine Limestone Powder: Shrinkage and Surface Electrical Resistivity of Equivalent Mortars

Author(s)

Alejandro Duran-Herrera, Juan De-Leon-Esquival, Dale P. Bentz, P Valdez

Abstract

Self-compacting concrete (SCC) has become a technological preferred option for many projects that should satisfy strict fresh stage properties that are of major concern in quality assurance. To ensure stable and robust fresh stage properties, typically a significant amount of fine materials should be incorporated, but this increases the shrinkage potential. For this purpose, fly ash (FA) has been used, but because it can induce delays in times of setting, it is not as extensively used as it should be. Under this scenario, micro limestone powders (L) have been effectively used to counteract the delays in the times of setting of concrete with high volumes of fly ash. For a fixed water/powder ratio equivalent to a water-to-cement ratio of 0.40 in a 100 % cement mixture, a total of thirteen mortars were produced to evaluate the synergetic effect of twelve Portland cement substitutions by FA+L in times of setting, compressive strength, shrinkage and electrical resistivity. Results suggest appropriate FA+L combinations to counteract retardation in times of setting and to significantly improve electrical resistivity and volume stability.
Citation
Construction and Building Materials

Keywords

Fly ash, micro limestone powder, self-compacting concrete, setting times, shrinkage, surface electrical resistivity

Citation

Duran-Herrera, A. , De-Leon-Esquival, J. , Bentz, D. and Valdez, P. (1970), Self-Compacting Concretes Using Fly Ash and Fine Limestone Powder: Shrinkage and Surface Electrical Resistivity of Equivalent Mortars, Construction and Building Materials (Accessed June 19, 2024)

Issues

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Created October 13, 2017, Updated October 12, 2017