| 摘要 |
<p>Mixture for producing a water-permeable covering for paths and roads comprises 2.5-5 vol.% cement, 75-95 vol.% coarse additive, 1-2.5 vol.% fine additive and 3.5-8 vol.% water. The lower grain boundary of the coarse additive lies at least 0.5 mm, preferably at least 0.9 mm, above the upper grain boundary of the fine additive. An independent claim is also included for a binder mixture for forming the above mixture comprising 50-70 vol.% cement and 30-50 vol.% dust as fine additive. Preferred Features: The cement component contains 55-70 vol.% CaO, 15-25 vol.% SiO2, 3-10 vol.% Al2O3, 1-10 vol.% Fe2O3, and less than 10 vol.% residual components.</p> |
