| 摘要 |
The present invention relates to a pile grouting composition comprising, based on Type 3 blast furnace slag cement, 10-100 parts by weight of ferro-nickel slag micropowder and 10-100 parts by weight of calcined dolomite. According to the present invention, free CaO and SiO_2 ingredients of ferro-nickel slag micropowder and calcined dolomite micropowder are activated by the stimulation of alkali and sulfate produced during the hydration of Type 3 blast furnace slag cement, thereby providing strength at least equal to the strength of Type 1 general cement. In addition, MgO ingredient contained in ferro-nickel slag micropowder and calcined dolomite micropowder each in an amount of 30 wt% or more is combined with compounding water (H_2O) so that it is converted into Mg(OH)_2 to realize strength while undergoing expansion. Such a volumetric expansion action is used to grout the voids in perforated ground and natural ground and prevents loss of a grouting solution caused by ground water that may exist between a perforation hole and an embedded pile. Thus, it is possible to significantly improve the tip supporting power and circumferential surface frictional force of the embedded pile as compared to the conventional grouting solution. |
