Harmless conversion treatment manner and harmless conversion revised earth null of revised

摘要

PURPOSE: To obtain pollution-free improved soil usable as a backfilling material or a filling material. ;CONSTITUTION: Improved soil having bettered properties by mixing soil with quick lime and cement is alkalized with slaked lime, Ca(OH)₂. The improved soil is overspread with a cover 1, pressure is applied to the improved soil by adding CO₂ from a CO₂ tank to neutralize the surface and the interior of the improved soil by the reaction of the formula, Ca(OH)₂CO₂→CaCO₃→H₂. The neutralized improved soil has the same handleability required for reuse as a backfilling material or a filling material and properties such as strength as those of the improved soil which is not neutralized. The neutralized improved soil is not alkalized with underground water and is usable as a backfilling material or a filling material with a sense of security.;COPYRIGHT: (C)1995,JPO