LOW ALKALI HARDNER FOR WATER-CONTAINING SOIL AND HARDENING TREATMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a low alkali hardner for water-containing soil capable of hardening the water-containing soil so as to indicate low alkali having a pH of 9 to 10 of a hardened body and have sufficient strength, and a hardening treatment method using it.

SOLUTION: The low alkali hardner for the water-containing soil is made by including magnesium oxide of more than 15 mass% and 60 mass% or less, water hardening alumina of 30 to 82 mass% heated until constant weight is obtained at 50 to 400°C of amorphous aluminum hydroxide hydrate, having the top of a broad peak at 2θ=22±5°of a powder x-ray diffraction spectrum in a wave length of 1.5405Åand having a half-value width of 6 to 20°based on a base line having the broad peak, and lithium carbonate of 2 to 15 mass%. This hardner of 50 to 200 kg/m3is loaded per the water-containing soil of 1 m3, thereby enabling highly strengthened hardening treatment at a pH of 9 to 10 suitable for heavy metal insolubilization.

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