HARDENING COMPOSITION FOR DEEP MIXING METHOD

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The present invention relates to a method for producing a hardening composition for a deep sea mixing method and to a hardening composition for a deep sea mixing method, wherein the use of cement is minimized. More specifically, the present invention relates to a hardening composition which replaces normal Portland cement used when a deep mixing method (soil cement wall, deep cement mixing, deep soil mixing pipe, or deep soil mixing) for improving the ground by boring the seabed to a deep layer and mixing the original soft seabed with the hardening composition is used for the purpose of improving the seabed. Three-kind blast furnace slag cement, blast furnace slag powder, and desulfurized gypsum are used as main materials. An expanding material and high calcium incinerated bottom ash as a stimulator are utilized compositively, wherein the contents of collected dust which is a cement kiln product and calcium oxide in the high calcium incinerated bottom ash is 20% or more. Accordingly, the latent hydraulic properties of slag fine powder are activated, and caking strength is expressed. Using heating and cubical expansion functions of CaO of a large amount contained in the high calcium incinerated bottom ash, soil is rapidly stabilized. The hardening composition for a deep sea mixing method in which the use of cement is minimized by means of the present invention comprises 50 to 100 parts by weight of blast furnace slag fine powder and 50 to 100 parts by weight of coke desulfurized gypsum based on 100 parts by weight of three-kind blast furnace slag cement.(AA) Sample extracting(BB) Sample(CC) Hardening composition(DD) Water (seawater)(EE) Hardening composition slurry(FF) Mix (for 10 minutes)(GG) Mold filling(HH) Produce a test piece specimen (diameter 5cm, height 10cm)(II) Cure (curing temperature 20 ± 3° C) (humidity 95% or more)(JJ) Compressing strength testCOPYRIGHT KIPO 2014