碱激发碳酸盐-矿渣复合灌浆材料的工作性能

在碱激发碳酸盐-矿渣复合灌浆材料试验研究中引入浆液Marsh时间与Mini扩展度试验方法,以表征浆液的表观粘度和屈服应力,并结合传统的凝胶时间试验方法,综合研究了不同配方浆液的工作性能.结果表明:硅酸钠溶液浓度和矿渣掺量对浆液工作性能的影响相似,其值增大,浆液凝胶时间缩短,Marsh时间延长,扩展度减小,即浆液的表观粘度和屈服应力随之增大,并且发现其将随时间而进一步显著增大,说明浆液保持良好流动性的时间缩短.硅酸钠溶液模数或缓凝剂掺量增加时,浆液凝胶时间延长,且保持良好流动性的时间增加,但其起始表观粘度和屈服应力变化不大.

Workability of Alkali Activated-Carbonatites-Slag Grouting Material

The workability of alkali activated-carbonatites-slag grouting materials with different proportioning was studied,in which Marsh cone flow time and mini-slump in combination with conventional gelation time test were adopted to characterize the apparent viscosity and yield stress of the materials.It was observed that the effect of the concentration of sodium silicate solution on the workability of the materials was similar to that of the slag addition,when the concentration of sodium silicate solution or slag addition was increased,the gelation time and mini-slump of the materials were decreased and the Marsh cone flow time was prolonged,i.e.the apparent viscosity and yield stress of the materials were enlarged.In addition,they were further increased markedly along with time.The above phenomena indicates that the flowability of the materials becomes worse rapidly with the increase of the concentration of sodium silicate solution and slag addition.When the modulus of sodium silicate solution or the amount of added setting retarder was increased,both the gelation time and the duration with good flowability of the materials was broaden,with their initial apparent viscosity and yield stress being changed a little.