| 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 analysis spectrum for <27>Al; b) an alkaline sodium and/or potassium disilicate, (Na2, K2)(H3SiO4); c) a calcium silicate characterized in that the mol ratios between the three reactive elements are the same or between (Na2, K2)(H3SiO4)/(2SiO2, Al2O3) 0.40 and 0.60; Ca<++>/(2SiO2, Al2O3) 0.60 and 0.40; so that (Na2, K2)(H3SiO4)2 + Ca<++>/(2SiO2, Al2O3) = 1,0 wherein Ca<++> designates the calcium ion belonging to a slightly basic calcium silicate with an Ca/Si atomic ratio of less than 1.</p> |
