Early age strength of SCC with large volumes of fly ash

摘要

Self-compacting concrete generally possesses a high powder content which keeps the concrete cohesive with high flowability. For achieving economy, a substantial part of this powder could contain fly ash. In such cases, early age strength development may prove to be a decisive factor, particularly when the formwork has to be reused. Test results of an experimental study are presented in this paper, which involved fly ash contents of more than 50 percent of the total powdered material. Compressive strength and split tensile strength test results are reported at the ages of 3, 7, 28 and 56 days. Compressive strengths of the order of 20 and 30 MPa are obtained with SCC at the ages of 3 and 7 days, respectively.