Ⅱ형 無水石膏를 利用한 高强度 콘크리트 PC Pile用 混和材 開發에 關한 硏究 = A study on the Development of Mineral Admixture for the Precast High-Strength Pile with TypeⅡ-Anhydrite

다국어 초록 (Multilingual Abstract)

The purpose of this study is to develope on alternative admixture for manufacture of PHC pile(compressive strength above 800㎏/㎠). For the investigation, alternative admixtures were made of Ⅱ-anhydrite and pozollanic fine powers(e.q., fly-ash, silica-fume), and the fluidity of the cement pastes and mortars added to these admixtures and compressive strength of hardened mortars at steam curing condition, were respectively examined. Also, base on the that study of cement pastes and mortars, properties of compressive strength of concretes with existing admixture(specimen name SM) and alternative admixture(specimen name MFS-1) for High-strength concrete precast pile, at steam and standard curing condition, were compared each other.
As a result of this experimental study, it was found that specimens made on Ⅱ-anhydrite and pozollanic fine powers had an increase on the fluidity of cement pastes and mortars, and compressive strengths of mortar and concrete were as good as those with SM. Consequently, we could prove that a high strength concrete(with a compressive strength of 985㎏/㎠ at 28 days) for high-strength concrete precast pile was able to be made with such admixture.