Entity

Time filter

Source Type

Cheongwon, South Korea

Byun S.-H.,Dankook University | Kim H.-C.,Sungshin Cement Co Ltd. R and D | Kim J.-Y.,Sungshin Cement Co Ltd. R and D | Choi H.-K.,Sungshin Cement Co Ltd. R and D | Song J.-T.,Dankook University
Journal of the Korean Ceramic Society | Year: 2010

This study examined the effects of particle size on characteristics of cement by controlling the particle size of commercial cement. Through a size adjustment, the cement has increasing more of particles that are less than 10 μm in size so the initial reaction time has been shortened as a result of improvement in the early hydration reaction. Additionally, it showed a great characteristics of strength from the early age and the initial hydration heat has been increased as well. In the upper and middle parts cements, the initial hydration reaction rate contribution is high with the 10 μm compared to original cement. So the initial hydration reaction rate is improved and as a result, it also showed relatively high hydration heat as well. Additionally, adiabatic temperature also showed an increase rate in the results. Source


Kim J.-Y.,Sungshin Cement Co Ltd. R and D | Yum S.-K.,Sungshin Cement Co Ltd. R and D | Yoo D.-W.,Sungshin Cement Co Ltd. R and D | Choi H.-K.,Sungshin Cement Co Ltd. R and D
Journal of the Korean Ceramic Society | Year: 2010

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. Source

Discover hidden collaborations