Sementslurry med svaert lav tetthet

摘要

A cement slurry having a density between 750 kg/m<3> and 1,000 kg/m<3>, comprising a solid fraction comprising: either 75% - 90% (by volume) of lightweight particles having a mean particle size between 10 and 60 mu m; 10% - 25% (by volume) of Portland cement having a mean particle size of between 10 and 50 mu m, or micro-cement having a mean particle size between 0.5 and 5 mu m; or: 20% - 50% (by volume) of lightweight particles having a mean particle size between 10 and 60 mu m; 10% - 25% (by volume) of Portland cement having a mean particle size of between 10 and 50 mu m, or micro-cement having a mean particle size between 0.5 and 5 mu m; 35% - 65% (by volume) of lightweight particles having a mean particle size between 100 and 200 mu m; and a liquid fraction present in an amount of 37% - 50% (by volume) of the total volume. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density.