Self-compacting concretes using fly ash and fine limestone powder: Shrinkage and surface electrical resistivity of equivalent mortars
| Autor: | J. De-León-Esquivel, Dale P. Bentz, P.L. Valdez-Tamez, A. Durán-Herrera |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Cement
Materials science 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction 0201 civil engineering law.invention Portland cement Compressive strength Volume (thermodynamics) law Electrical resistivity and conductivity Fly ash 021105 building & construction General Materials Science Composite material Mortar Civil and Structural Engineering Shrinkage |
| Zdroj: | Construction and Building Materials. 199:50-62 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2018.11.191 |
| Popis: | Self-compacting concrete (SCC) has become a 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 is incorporated, but this often increases shrinkage. For this purpose, fly ash (FA) has been used, but because it can induce delays in times of setting, it is not extensively used. 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 effects of twelve portland cement substitutions by FA + L on times of setting, compressive strength, shrinkage and electrical resistivity. Results indicate appropriate FA + L combinations to counteract delays in times of setting and to significantly improve electrical resistivity and volume stability. |
| Databáze: | OpenAIRE |
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