| 摘要 |
The present invention relates to a pile grouting material including 100-300 wt part of blast furnace slag fine aggregates, and 100-300 wt part of gypsum containing at least 50 wt% of calcium oxide, and at least 15 wt% of sulfate oxide based on 100 wt part of ferronickel slag fine aggregates. According to the present invention, CaO and SiO_2 ingredients obtained by vitrificating ferronickel slag fine aggregates and granulated blast furnace slag are activated by alkali and sulphate stimulus of the gypsum including at least 50 wt% of calcium oxide, and at least 15 wt% of sulfate oxide at hydrogen ion concentration (pH) of 12 or more, so that strength equal to or greater than that of type I ordinary cement used as the pile grouting material can be obtained. In addition, according to the pile grouting material, end bearing capacity and skin friction of a bored pile can be more improved as compared with those of existing injected cement liquid by preventing injected liquid from leaking by underground water filled in a gap between a bored ground and an original ground and existing between bores and the bored pile through a volume expansion reaction in which at least 30 wt% of MgO ingredients contained in ferronickel slag fine aggregates meet water (H_2O) to change into Mg(OH)_2 to be expanded. |
