磷铝酸盐水泥基灌浆材料流变性能及保水性能  

Rheological Property and Water Retention Property of Aluminophosphate Cement-based Grouting Material

作　　者：杨蓉[1] 李相国[1] 刘卓霖[1] 徐鹏辉[1] 蒋文广[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐通报》2017年第6期2043-2048,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51572207)

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。The fluidity and rheology of cement-based grouting materials is one of the important assess standard for deep geological disposal of high radioactive waste. Addtionatly, a low pH value have a advantage of a solidification cement-based grouting material. The disciplinarian of water cement ratio, additives to the capacity of water retention, rheological properties of aluminophosphate cement were studied. The results show that a greater water cement ratio contribution to a smaller viscosity and better fluidity, but a negative effect for the and segregation. With the increasing dosage of mgo-based expansive agent, the viscosity of paste is increased. Furthermore, the higher activity of swelling agent, the worse the rheological properties of paste; Hydroxypropyl methyl cellulose ether（HPMC） and sodium bentonite both can improved water retention properties of cement paste, but the former is superior to the latter in some aspects. When the dosage of HPMC is more than 0.3%, the segregation of cement-based grouting materials cannot be found. It is known that the water reducing effect of polycarboxylate superplasticizer is better than that of naphthalene superplasticizer, adding water reducing agent can reduce the viscosity as well as the stability of paste.

关 键 词：磷铝酸盐水泥 流变性能 保水性能 水灰比 外加剂 

分 类 号：TQ172[化学工程—水泥工业]