| 요약2 |
This study is to provide the experimental results of the concrete incorporating a fine particle classification cement (FC) subjected to different curing temperatures, contents and water to cement ratios (W/C). FC contents is ranged from 0% to 100%, W/C ranged from 40 to 60% and curing temperature ranged from 5℃ to 35℃ are considered as experimental parameters, respectively. The scanning electron microscope (SEM) and the mercury intrusion penetration (MIP) observation are carried out to study micro-structure of the concrete incorporating FC including pore structure and hydration products. According to the results, the use of FC resulted in an increase of dosage in SP and AE agent due to increased viscosity. As expected, an increase in FC contents led to enhance the compressive strength at early age due to improved blaine fineness of the binder. For the SEM observation results, FC concrete had chain type C-S-H gel, ettringite and small amount of mono-sulfate which can be observed at later stage of hydration. Accordingly, it is confirmed that FC played important role in enhancing the compressive strength at early age. For the MIP observation, with the increase of FC contents, cement hydrates had less than 0.05㎛ pore. Hence, An use of FC results in beneficial effect on the compressive strength of the concrete at early age. |