| abstract |
A method for the production of a water-permeable porous concrete comprising the steps of mixing a concrete mixture containing A. GRANULAR MINERAL AGGREGATES OF A UNIFORM GRAIN FRACTION IN THE RANGE OF 3 TO 30 MM WITH A TOLERANCE RANGE OF 4 TO 15 MM, B. HYDRAULIC CEMENT IN THE PRESCRIBED AMOUNT ACCORDING TO THE JOB SPECIFICATIONS, C. A MACROMOLECULAR WATER-SOLUBLE COMPOUND IN AN AMOUNT OF FROM 0.05 TO 2 PERCENT BY WEIGHT BASED ON THE CEMENT, SAID COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF PLANT GUMS, STARCH PRODUCTS, CELLULOSE ETHERS, AND SYNTHETIC POLYMERS. D. WATER IN SUCH AN AMOUNT THAT THE WATER-CEMENT RATIO IS BETWEEN 0.32 AND 0.48 WHEREBY SAID CONCRETE MIXTURE IS SPRAYABLE, AND PLACING SAID CONCRETE MIXTURE BY SPRAYING, AS WELL AS THE HARDENED CONCRETE MIXTURE. |