关键词: 磷铝酸盐水泥;流变性能;保水性能;水灰比;外加剂

Abstract: The fluidity and rheology of cement-based grouting materials is one of the important assess standard for deep geological disposal of high radioactive waste.Addtionally, 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.

Key words: aluminophosphate cement;rheological property;water retention property;water cement ratio;additive