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2021年 第15卷 第5期

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《结构与土木工程前沿（英文）》 >> 2021年 第15卷 第5期 doi: 10.1007/s11709-021-0770-4

Extending blending proportions of ordinary Portland cement and calcium sulfoaluminate cement blends: Its effects on setting, workability, and strength development

1. Department of Civil and Environmental Engineering, University of Alberta, Edmonton T6G 1H9, Canada;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6G 1H9, Canada;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6G 1H9, Canada;1. Department of Civil and Environmental Engineering, University of Alberta, Edmonton T6G 1H9, Canada

收稿日期： 2021-03-05 录用日期： 2021-10-19 发布日期： 2021-10-15
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This study extended blending proportion range of ordinary Portland cement (OPC) and calcium sulfoaluminate (CSA) cement blends, and investigated effects of proportions on setting time, workability, and strength development of OPC-CSA blend-based mixtures. Thermogravimetric analysis (TGA) and X-ray diffraction (XRD) were conducted to help understand the performance of OPC-CSA blend-based mixtures. The setting time of the OPC-CSA blends was extended, and the workability was improved with increase of OPC content. Although the early-age strength decreased with increase of OPC content, the strength development was still very fast when the OPC content was lower than 60% due to the rapid formation and accumulation of ettringite. At 2 h, the OPC-CSA blend-based mortars with OPC contents of 0%, 20%, 40%, and 60% achieved the unconfined compressive strength (UCS) of 17.5, 13.9, 9.6, and 5.0 MPa, respectively. The OPC content had a negligible influence on long-term strength. At 90 d, the average UCS of the OPC-CSA blend-based mortars was 39.2 ± 1.7 MPa.

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