| 摘要 |
A method of preparing a distance heating pipe insulated with foamed cement, said pipe comprising an inner metal pipe and an outer plastic pipe, wherein a foamable cementitious mixture is introduced into the space between the outside of the inner pipe and the inside of the outer pipe, said mixture containing, based on the weight of cement, 70-80 % by weight of water, 0.15-0.5 % by weight of a foaming agent and 4-6 % by weight of setting controlling agent in the form of one or more calcium aluminates, and wherein the mixture is caused to foam and set. |
