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将自行研制的高吸水性树脂加入砂浆配方,研究了高吸水树脂对不同水灰比下新拌砂浆的流动度、砂浆在干燥养护过程中的体积收缩以及力学性能的影响。研究发现:高吸水性树脂的加入一定程度上降低了砂浆的流动度;砂浆在干燥养护时,在水灰比(质量比)为0.5～0.7范围内,砂浆的总体积收缩与水灰比关系不大,高效减水剂多聚羧酸酯的加入能增大砂浆的体积收缩;在水灰比为0.5～0.6的砂浆干燥养护时,将高吸水性树脂加入到砂浆中可以明显减小其体积收缩;而对水灰比为0.7的高水灰比砂浆的体积收缩改善作用不明显;对于水灰比为0.7的高水灰比砂浆,高吸水性树脂的加入导致其二次浸水时的吸水率增大。此外高吸水性树脂的加入能提高干燥情况下养护后砂浆的力学性能,尤其在较低水灰比的砂浆中作用更为明显。
The superabsorbent resin developed by ourselves was added to the mortar formulation. The fluidity of the superabsorbent resin to the fresh mortar under different water-cement ratio, the volume shrinkage and the mechanical properties of the mortar during the drying and curing process were studied. The results showed that the addition of superabsorbent polymer reduced the fluidity of mortar to a certain extent. When the mortar was dry-cured, the ratio of the total volume shrinkage of mortar to the water-cement ratio was within the range of 0.5 to 0.7 (mass ratio) The addition of superplasticizer polycarboxylate can increase the volume shrinkage of mortar. When the mortar with water-cement ratio of 0.5 ~ 0.6 is dry-cured, the addition of superabsorbent polymer to mortar can obviously reduce its volume shrinkage Volume shrinkage; while the water-cement ratio of 0.7 high water-cement mortar than the volume shrinkage improvement is not obvious; for the water-cement ratio of 0.7 high water-cement than the mortar, superabsorbent resin lead to the second water Water absorption increased. In addition, the addition of superabsorbent polymer can improve the mechanical properties of cured mortar under dry conditions, especially in the mortar with lower water-cement ratio.