| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction while keeping a coagulation rate fast and plasticity long after the start of the coagulation by mixing an alkali silicate with a concrete before hardening, obtained by mixing at least a cement, an aggregate and water, and placing the obtained mixture in a frame mold which is a temporary structure having a prescribed shape and size and for supporting the concrete until the concrete has a proper strength. SOLUTION: An alkali silicate as a coagulation accelerator has a molar ratio of the alkali/silicic acid regulated so as to be (1/8)-(1/0.5), and preferably selected from sodium silicate (Na2O.nSiO2.mH2O), potassium silicate (K2 O.nSiO2.mH2O), lithium silicate (LiO2.nSiO2.mH2O), cesium silicate (Cs2 O.nSiO2.mH2O), rubidium silicate (Rb2O.nSiO2.mH2O) and a quarternary ammonium silicate [R4N.nSiO2.mH2O (R is an alkyl)]. The percentage of the alkali silicate is preferably 0.2-5.0 wt.% expressed in terms of solid based on the cement. Secondarily, a frame mold can be reused.
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