抄録
At a construction work, chemical grouting for soil stabilization is generally used only for temporary purpose. However, hydrophobic polyisocyanate-type ‹aquareactive› grout named TACSS has been often applied for permanent use such as strengthening the ground under the foundation or piles of structure.
Since the gel produced by an aqua-reaction is non-hydrated and has three dimensional chemical structures, it is considered that gel product formed in the soil and water can be expected to maintain the stable condition without loosing it's strength characteristics. However, experimental data about the durability of soil solidified with grout was not yet obtained, and so a follow-up test has been carried out to confirm the durability experimentally. Test specimens of soil solidified with grout were burned in the ground impregnated with an industrial chemical waste or dipped in various kinds of water such as sea water and muddy humes etc. for 19-22 years.
During those years they were occasionally taken out from the ground or water and a non-destructive follow-up test was proceeded by measuring the velocity of ultrasonic wave.The durability test was completed this time and all of the specimens were submitted to the bending tests and unconfined compressive strength tests. As a result of this experiment, it is proved that the mechanical properties of soil solidified with hydrophobic polyisocyanate-type grout are superior and can maintain the mechanical characteristics without deterioration by leaching, swelling, softening etc. even under the strict circumstances for a long term of about 20 years.
