磷铝酸盐水泥基灌浆材料流变性能及保水性能

发布时间：2019-01-06 11:03

【摘要】：采用低pH值水泥基材料固化高放射废弃物具有很好的优势,而水泥基灌浆材料的流变性能是评价高放废物深地质处置用灌浆材料的重要指标之一。探究了水灰比、外加剂对磷铝酸盐水泥流变性能以及保水性能的影响规律。结果表明:水灰比越大,浆体粘度越小,流动性能越好,但浆体越不稳定,越容易离析;而且Mg O膨胀剂的掺入,增大了浆体的粘度,其中膨胀剂活性越高,浆体的流变性越差;羟丙基甲基纤维素醚以及钠基膨润土掺入改善水泥浆体保水性能,羟丙基甲基纤维素醚的保水效果优于钠基膨润土,当HPMC掺量大于0.3%,灌浆液不析水;掺加减水剂降低了浆体的粘度,且聚羧酸系减水剂的减水效果优于萘系减水剂,同时减水剂的掺入会使浆体的稳定性下降。
[Abstract]:The solidification of high radioactive waste with low pH value cement-based material has a good advantage, and the rheological property of cement based grouting material is one of the important indexes to evaluate the grouting material for deep geological disposal of high-level radioactive waste. The effects of water cement ratio and admixture on the rheological and water retention properties of phosphoaluminate cement were investigated. The results show that the higher the water-cement ratio, the smaller the viscosity and the better the fluidity of the slurry, but the more unstable the slurry is, the easier it is to separate. The viscosity of the slurry was increased with the addition of Mg O expansive agent, and the higher the swelling agent activity was, the worse the rheological property of the slurry was. Hydroxypropyl methyl cellulose ether and sodium bentonite were added to improve the water retention of cement paste. The water retention effect of hydroxypropyl methyl cellulose ether was better than that of sodium bentonite. The viscosity of the slurry was reduced by adding water reducer, and the water reducing effect of polycarboxylic acid water reducer was better than that of naphthalene series water reducer, and the stability of slurry was decreased with the addition of water reducing agent.
【作者单位】：武汉理工大学硅酸盐建筑材料国家重点实验室;
【基金】：国家自然科学基金(51572207)
【分类号】：TU528

【相似文献】