| Title |
The Effect of Ingredients of Liquid Accelerating Agent on Cement Mortar |
| Authors |
Lee, Mun-Hwan ; Song, Young-Chan |
| Keywords |
Liquid Additive ; Early Strength ; Accelerating Agent ; Ternary Blended Binder ; Ready Mixed Concrete |
| Abstract |
Ternary blended concrete which is made of OPC mixed with fly ash and blast-furnace slag has the critical defect that construction schedule is delayed by deterioration of early strength when applied in construction site.In this study, fundamental properties are experimented and investigated to verified functions of each ingredients based on mortar matrix with more sensitivity for liquid accelerating agent which is developed to protect deterioration of early strength of ternary blended concrete.The result is as follow. 1) Although it is predominant to secure early strength by accelerating source, using accelerating source separately is awkward to improve strength because of its marked slump loss and deterioration of strength caused by coarse C-S-H Type Ⅱ formed after early age. 2) Due to improvement of flowability by promoting ettringite formation, SO4 source is necessary for accelerating source, although it has no efficacy to improve strength. 3) Si source shows effect to improve early strength of pozzolanic materials like blast-furnace slag powder or fly ash by accelerating alkali atmosphere during hydration and it also shows strength improvement after early age. |