| 摘要 |
The invention relates to the use of at least one additive selected from ethylene-diamine-tetraacetic acid, ethylene-diamine-tetramethylene phosphonic acid, polyoxyethylene phosphonic acid, citric acid, orthoboric acid, and their salts, mono- and di-saccharides, their acid derivatives, and their salts, as a retarder for setting a high-alumina cement at a high temperature. Setting of a cement slurry containing one of these additives can be induced at the desired moment by adding a lithium salt. |
