| 摘要 |
<p>Method for preparing a powdered cold setting spherosilicate-type cement which develops, after 4 hours at 20 DEG C, a compressive strength of at least 15 MPa with a water/binder ratio of 0.20-0.27, wherein the following three reactive elements are used: a) an alumino-silicate oxide (2SiO2,Al2O3) having the Al cation in (IV-V) co-ordination as determined by the MASS-NMR Nuclear Magnetic Resonance spectrum analysis for <27>Al; b) an alkaline sodium and/or potassium disilicate, (Na2,K2)(H3SiO4); c) calcium silicate characterized in that the mol ratios between the three reactive elements are the same or between (Na2,K2)(H3SiO4)2/(2SiO2,Al2O3) = 0,40 and 0,60, Ca<++>/(2SiO2,Al2O3) = 0.60 and 0.40 so that (Na2,K2)(H3SiO4)2 + Ca <++>/(SiO2,Al2O3) = 1,0 wherein Ca<++> designates the calcium belonging to a slightly basic calcium silicate with an Ca/Si atomic ratio of less than 1.</p> |
