| 摘要 |
PROBLEM TO BE SOLVED: To obtain a low-alkaline hydraulic material, controllable in curing time as desired, easy to work, and excellent in mechanical strength developability, having a composition: CaO-Al2 O3 -SO3 -SiO2 -Fe2 O3 with the respective component proportions specified. SOLUTION: This hydraulic material consists of a CaO-Al2 O3 -SO3 -SiO2 -Fe2 O3 - based cement composition with the chemical composition in terms of molar ratio being (CaO-2SO3 )/SiO2 <1.3 and SO3 /(Al2 O3 +Fe2 O3 )<3. It is preferable that the alkali quantity (R2 O) in the cement composition satisfies the equation, R2 O=Na2 O+0.658K2 O<0.4(wt.%). This hydraulic material is obtained from the following materials as constitutes: low-calcium cement clinker consisting mainly of 3CaO.3Al2 O3 .CaSO4 , 2CaO.SiO2 , 4CaO.Al2 O3 .Fe2 O3 and CaSO4 , at least one kind among blast furnace granulated slag and silica fume, and, according as necessary, calcium sulfate. |
