• Magazine of the Korean Society of Agricultural Engineers
• /
• v.14 no.3
• /
• pp.2677-2684
• /
• 1972

This study was carried out to search for an effect on strengths of a pozzolan and a high-early strength cements due to accelerating the initial setting and a rate of strength development at early age, and to obtain the effects applicable for structural construction works safety in the cold winter weather. The results of the study were as follows: 1. The early strength of high-early strength cement was higher than an ordinary portland cement(Type I). 2. High-early strength cement had a characteristic suitable for construction works in the cold weather due to the rate of acceleration of the eary strength. 3. When using pozzolan cements, a weight proportion should be considered in mix design since the pozzolan cement has a lower specific gravity than other portland cements. 4. It was desirable for the pozzolan cement to shorten the storage period since particles of the pozzolan cement was so fine that it was likely to weathering.

• Cement
• /
• s.38
• /
• pp.22-27
• /
• 1970

• Journal of the Korea Institute of Building Construction
• /
• v.13 no.3
• /
• pp.227-234
• /
• 2013

In this research, early strength development performance of early strength improvement type ordinary cement which is economically feasible early strength cement(Type III), improved early strength ordinary cement(Type I), was estimated to derive minimum curing temperature and proper water to cement ratio according to cement for early strength development through examination of fresh concrete properties and compressive strength according to water to cement ratio curing $10^{\circ}C$, $15^{\circ}C$ and $20^{\circ}C$ to suggest fundamental data for practical use of early strength concrete.

• Cement Symposium
• /
• no.18
• /
• pp.33-39
• /
• 1990

• Cement
• /
• s.108
• /
• pp.30-33
• /
• 1987

• Cement Symposium
• /
• no.28
• /
• pp.63-66
• /
• 2001

• Cement Symposium
• /
• no.31
• /
• pp.106-114
• /
• 2004

• Cement
• /
• s.168
• /
• pp.51-59
• /
• 2005

• Cement Symposium
• /
• s.46
• /
• pp.93-98
• /
• 2019

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.9 no.2
• /
• pp.177-184
• /
• 2021

In this study, the effects of ground granulated blast furnace slag(GGBFS) and expansive additive(EA) on early strength mortar were examined for the purpose of reducing carbon and improving cement performance. As a result, ealry strength Portland cement(EPC) tended to decrease in flow compared to ordinary Portland cement(OPC), but binder with EPC and GGBFS was possible to obtain higher liquidity than OPC. EPC showed higher compressive strength and shrinkage than OPC. The compressive strength of specimen with EPC and GGBFS was reduced proportionally to the replacement ratio of GGBFS. The replacement ratio of GGBFS above the compressive strength equivalent to OPC was higher under low temperature conditions. The use of GGBFS resulted in high shrinkage compared to OPC, and this characteristic was even greater under low temperature conditions. The shrinkage of specimen with EA was decreased in early ages, but was higher than the OPC in long-term ages.