| 摘要 |
The surface covering (1) comprises molded bricks (3, 3', 3'') made of concrete provided together with a bedding layer (2), where the molded bricks are created by plasters, and the adjacent molded bricks form joints (4, 4') that are filled with a sand-like joint material (5) and form an infiltration way for draining precipitation water runoffs form a surface of the surface covering into the bedding layer. The joint material forms a filter layer for the removal of pollutants from the precipitation water runoffs, and consists of a mixture of a sand-like portion and a fine portion. The surface covering (1) comprises molded bricks (3, 3', 3'') made of concrete provided together with a bedding layer (2), where the molded bricks are created by plasters, and the adjacent molded bricks form joints (4, 4') that are filled with a sand-like joint material (5) and form an infiltration way for draining precipitation water runoffs form a surface of the surface covering into the bedding layer. The joint material forms a filter layer for the removal of pollutants from the precipitation water runoffs, and consists of a mixture of a sand-like portion, a fine portion and an artificial molecular sieve, where a volume percentage of the: artificial molecular sieve is 2-10%; fine portion is 3%; artificial molecular sieve is 5%; and sand-like portion is 92% based on the total volume of the mixture. A quartz powder as fine portion has a grain size of 0.001-0.2 mm. The artificial molecular sieve has a grain size of 1.8-2.3 mm, and a pore diameter of 4 Å , 5 Å or 10 Å . The joints have a width of 4-8 mm. The bedding layer is formed with stable filters opposite to a filler material, and is formed form a material mixture having a particle size of 0-5 mm, where the material mixture has a particle size of smaller than 0.63 mm, and a volume percentage of the material mixture is 3%. The molded bricks are constructed in two layers, and comprise a waterproof face concrete layer, and a waterproof core concrete layer, which is made of no-fines concrete. An independent claim is included for a joint material for grouting a surface covering. |
