| 摘要 |
<p>A cementitious composition comprises (a) 20-90 wt% of an hydraulic cement containing 7-90 M% 12CaO.7Al2O3 (the balance of its hydraulic constituents being calcium silicate), (b) 5-60wt.% calcium sulfate (e.g. anhydrite), (c) 2-10 wt% another inorganic salt (e.g. sodium carbonate) and (d) 0.5-10wt% a clay (e.g. bentonite). The composition when made up with water is flowable and quick-setting and can be used for the stowing of cavities, for example in the construction of supportive packs in underground mines.</p> |
