| 摘要 |
PCT No. PCT/SE88/00369 Sec. 371 Date Jan. 8, 1990 Sec. 102(e) Date Jan. 8, 1990 PCT Filed Jul. 5, 1988 PCT Pub. No. WO89/00153 PCT Pub. Date Jan. 12, 1989.A method for producing a concrete with a controllable density, which at the density of 1200 kg/m3 has a compression strength of at least 3.5 MPa and after that linearly increases to at least 19 MPa at 2,000 kg/m3, characterized in mixing a base concrete mixture mainly consisting of cement and water with a porousity mixture mainly consisting of cement, water and a foaming agent so that the foaming agent constitutes at least approximately 5% by volume of the porousity mixture, and that the resultant mixture of the base concrete mixture and the porousity mixture is moulded in a conventional manner. |
