摘   要：研究了不同黏度不同掺量的羟丙基甲基纤维素（HPMC）对普通砂浆（砌筑砂浆、抹面砂浆）保水性能的影响。研究发现，HPMC能大幅提高砂浆的保水性，较大改善砂浆的施工性能，其合适掺量为0.4‰～0.5‰。在相同黏度不同掺量的HPMC条件下，砂浆的用水量基本保持不变，表观密度略有增加，保水率随着HPMC用量的增加而增加。在不同黏度相同掺量的HPMC条件下，砂浆的用水量同样基本一致，表观密度也是略有增加，保水率随着HPMC黏度的增加而增加。

Abstract: The influence of different viscosity and dosage hydroxypropyl methyl cellulose（HPMC） on water retention capacity for ordinary mortar was studied, including masonry mortar, pointing joint mortar. The results show that HPMC can significantly improve the water retention capacity of mortar and the workability of the dry-mixed mortar, and the suitable dosage is 0.4‰～0.5‰. When the dosage of HPMC is different and the viscosity is same, the water consumption of cement mortar basic remains unchanged, volume weight slightly increases, and water retention capacity increases with dosage increase of HPMC. When the viscosity of HPMC is different and the dosage is same, the water consumption of cement mortar basic remains unchanged, volume weight slightly increases, and water retention capacity increases with viscosity increase of HPMC.