| 摘要 |
The present invention relates to a hardening agent for a deep mixing method using light burned dolomite. The hardening agent includes, based on 100 parts by weight of light burned dolomite fine aggregates inspected and determined as having less than 10% of residues passed through a 0.044 mm (44 μm) sieve, or crushed and classified, 100-300 parts by weight of blast furnace slag fine aggregates inspected and determined as having less than 10% of residues passed through a 0.044 mm (44 μm) sieve, or crushed and classified, and 50-200 parts by weight of gypsum containing at least 50 wt% of calcium oxide and at least 15 wt% of sulfate oxide, and inspected and determined as having less than 10% of residues passed through a 0.044 mm (44 μm) sieve, or crushed and classified. According to the present invention, CaO and SiO_2 ingredients obtained by vitrification of blast furnace slag fine aggregates are activated by alkaline and sulfate stimuli 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 of the hardening agent equal to or greater than that of type I ordinary cement can be obtained. In addition, according to the present invention, low permeability can be represented as pore water of soil is excluded and volume expansion occurs through a volume expansion reaction in which at least 30 wt% of MgO ingredients contained in light burned dolomite fine aggregates meet water (H_2O) to be transformed into Mg(OH)_2 and be strengthened and expand, without an additional expansion agent. |
