Effect of Baume Degree on Performance of Cement-water Glass Slurry
Cement-water glass(C-S)dual slurry has been widely used in railway tunnel grouting and water plugging engineering,and the Baume degree of water glass has an important influence on grouting and water plugging effect.Based on the above consideration,the effects of different degrees of Baume(12～35°Bé)on the grouting properties,mechanical properties and dry shrinkage properties of C-S slur-ry was studied,and the mechanism was explored by X-ray diffraction(XRD),scanning electron micros-copy(SEM)and specific surface area test(BET)in this paper.The results show that the setting time of C-S slurry increases linearly,extending from 18 s to 31 s with the increase of Pommel degree form 12°Bé to 35°Bé.The compressive and flexural strength is also increasing with the increase of Baume degree,and the former displays a linear growth pattern while the latter demonstrates an exponential change tends to flat when the Baume degree exceeds 25°Bé.The free shrinkage rates of 56 d increases from 0.32％at 12°Bé and 0.62％at 25°Bé to 0.68％at 35°Bé.The consolidation mechanism of C-S slurry can be attributed to cement hydration,alkali excitation and carbonization.A large number of C-S-H gel and CaCO3 crystals are formed,resulting in a relatively dense structure of C-S hardened paste,and the den-sity increases with the increase of Baume degree.This is suitable for the seepage prevention and plug-ging or reinforcement of grouting materials.
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