Development of cement-free concrete using finely grained slag for Portland cement
The present study concerns a development of cement-free concrete using finely grained ground granulated blast furnace slag (GGBS) rather than ordinary Portland cement (OPC) as a binder in concrete mix.The GGBS was very finely ground to the level of 10,000 cm2/g, prior to casting concrete, compared to OPC of which the Blaine value accounts for about 3,200 cm2/g.In concrete casting, the NaOH activator was added to mixing water to enhance the hydration rate for cement-free concrete.To ensure the compatibility of GGBS in concrete, a development of concrete strength, ionic penetrability and pore structure were examined.As a result, it was found that cement-free concrete using the GGBS has a higher concrete strength at all ages from 7 to 56 days.In turn, the ionic penetrability, in terms of chloride diffusivity, was slightly lower in cement-free concrete than OPC concrete, presumably due to the dense pore structure, which was confirmed by the mercury intrusion porosimetry.Simultaneously, the adiabatic temperature for cement-free concrete initially rose more rapidly, leading to an accelerated hydration process.This suggests that the cement-free concrete containing GGBS can be used for structural concrete structures, imposing an economical benefit and structural stability.
GGBS Ionic penetrability Pore structure Adiabatic temperature
Ki Yong Ann Jaehwan Kim Seung Yeon Song
Civil Engineering, Hanyang University, Ansan, South Korea
国际会议
杭州
英文
1063-1070
2013-01-18（万方平台首次上网日期，不代表论文的发表时间）