Abstract:

The change law of congealing time that water glass—calcium carbonic acid grouting material corresponding with the change of calcium carbonic acid is researched. The congealing time of sol increases as the reduction of quality of calcium carbonic acid. However it does not increase evenly with reduction of calcium carbonic acid. There is up-rush point of congealing time when the calcium carbonic acid is reduced to a certain amount. It is difficult to control congealing time accurately, as solution has very sensitive to putting into amount of the calcium carbonic acid. Calcium carbonic acid as alkaline reaction in the whole reaction system, react by H+ of system with solution. The pH value of sol is raised and vitriolic concentration is reduced. So the sol congealing time is changed. The suitable congealing time of colloid is chosen to test their own intensity and corresponding firm sand intensity. The change laws of two kinds of intensity is obtained Under the condition of fixedness of vitriolic consumption. The pure colloidal intensity increases as the increase of the calcium carbonic acid generally. But after adding to a certain amount, its intensity no longer increases. It is not obvious that the intensity of firm-sand body varies with calcium carbonic acid. The slurry of more excellent proportion is chosen to be new grouting material, and according to the performance of the slurry, the corresponding grouting craft is proposed. It has done better preparative work for the subsequent project application.

Key words: water glass, grouting, material, congealing, intensity