| 숏크리트용 고분말도 슬래그 시멘트의 특성 |
| 김재영, 염수경, 유동우, 최현국 |
| (주)성신양회 기술연구소 |
| A Study on Properties of High Blaine Slag Cement for Shotcrete |
| Jae-Young Kim, Soo-Kyung Yum, Dong-Woo Yoo, Hyun-Kuk Choi |
| Sungshin Cement Co Ltd. R&D |
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| ABSTRACT |
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This study was performed to get basic information about properties of high blaine slag cement(HSC) to use shotcrete(or sprayed concrete and mortar). Particle size distribution, setting time and compressive strength test, analysis like as SEM, DSC thermal analysis, XRD was carried out to investigate principle properties of HSC. Setting time of HSC was delayed slightly, but influence of accelerators was more bigger than ordinary portland cement(OPC). Compressive strength of HSC at 28 days was more higher than OPC regardless of using accelerators. Results of analysis showed early period hydration products of HSC is more small and located widely, because of the interface of between cement particle and water is increased as specific surface of cement increase. From the SEM observation and analysis of DSC and XRD results, aluminates accelerators bring on some hydration products like as calcium aluminium hydrates, alkali free accelerators increases ettringite and monosulfates. Aluminates accelerators has a advantage of setting time and early strength, alkali free accelerators increases strength after 7 days. |
| Key words:
Shotcrete, Sprayed concrete, Slag cement, Accelerators, High blaine |
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