GROUND IMPROVING ADDITIVE FOR JET GROUT METHOD OF CONSTRUCTION AND GROUND IMPROVING CEMENT COMPOSITION USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a ground improving additive simultaneously satisfying (1) assurance of sufficient workability by improving flowability of slime, (2) reduction of amount of generation of construction sludge to large extent by reducing an infusion rate and (3) assurance of a necessary predetermined early strength in a process for rotatively jetting compressed air with cement milk into the ground under super high pressure and cutting and mixing the ground in a short time by jet grout method of construction and provide a ground improving cement using the same.;SOLUTION: The ground improving additive for jet grout method of construction contains the following A component and B component and comprises 10-95 mass% A component and 5-90 mass% B component (the sum total is 100 mass%): the A component is a water soluble vinyl copolymer prepared by alkali hydrolyzing a copolymer of a 3-8C olefin with maleic anhydride and having 2000-50000 mass average molecular weight; the B component is one or more species of sodium salts selected from sodium sulfite and sodium nitrite.;COPYRIGHT: (C)2007,JPO&INPIT