使用不同剂量方法的高吸水性聚合物（SAP） 水泥砂浆的性能

李 志杰, 洪 惠山
新加坡建筑材料部

摘要

改性水泥砂浆是通过掺入具有两种剂量状态的高吸水性聚合物（SAP）制备的，分别为干粉状 SAP和膨胀
SAP（其中 SAP已在自来水中预先润湿）。本文对比分析了砂浆的力学性能、干缩性和抗冻融性，并随 SAP含量和夹
带水灰比的变化而变化。此外，本文通过扫描电子显微镜（SEM）表征了 SAP对砂浆微观结构的影响。结果表明，
SAP解吸水后砂浆空隙中形成团聚堆积，SAP空隙周围存在丰富的水化产物，其中大部分为 C-S-H凝胶。粉状 SAP
的掺入使砂浆的 28天抗压强度提高约 10% ～ 50%，而膨胀 SAP的掺入可使砂浆的 28天抗压强度提高约-26% ～ 6%。
在用量为 0.1%SAP和夹带水灰比为 0.06时，粉状 SAP和膨胀型 SAP可分别降低砂浆收缩率约 32.2%和 14.5%。粉状和
膨胀型 SAP的掺入对水泥砂浆的抗冻融性都有积极影响，特别是对于夹带水灰比为 0.06的粉状 SAP，300次循环后的
失重率仍低于 5%。

关键词

高吸水性聚合物（SAP）；抗压强度；干燥收缩；抗冻融性

参考

[1]Wehbe, Y.; Ghahremaninezhad, A. Combined effect

of shrinkage reducing admixtures (SRA) and superabsorbent

polymers (SAP) on the autogenous shrinkage, hydration and

properties of cementitious materials. Constr. Build. Mater.

2017, 138, 151–162.

[2]Ramazani-Harandi, M.J.; Zohuriaan-Mehr, M.J.;

Yousefi, A.A. Rheological determination of the swollen gel

strength of superabsorbent polymer hydrogels. Polym. Test.

2006, 25, 470–474.

[3]Wang, F.; Yang, J.; Cheng, H.; Wu, J.; Liang, X.

Study on mechanism of desorption behavior of saturated

superabsorbent polymers in concrete. ACI Mater. 2015, 112,

463–470.

[4]Yu, F.Q.; Sun, N.; Deng, C. The Effect of SuperAbsorbent Polymer as a Self-Curing Admixture on the

Performance of Mortars. Adv. Mater. Res. 2011, 6, 287–290.

[5]Bentz, D.P.; Snyder, K.A. Protected paste volume

in concrete: Extension to internal curing using saturated

lightweight fine aggregate. Cem. Concr. Res. 1999, 29, 1863–

1867.

[6]Hajibabaee, A.; Ley, M.T. The impact of wet curing on

curling in concrete caused by drying shrinkage. Mater. Struct.

2016, 49, 1629–1639.

[7]Shen, D.; Jiang, J.; Jiao, Y. Early-age tensile creep

and cracking potential of concrete internally cured with prewetted lightweight aggregate. Constr. Build. Mater. 2017, 135,

420–429.

[8]Islam, M.R.; Xue, X.; Li, S. Effectiveness of WaterSaving Superabsorbent Polymer in Soil Water Conservation for

Oat Based on Ecophysiological Parameters. Commun. Soil Sci.

Plan Anal. 2011, 42, 2322–2333.

[9]Liu, T.; Qian, L.; Li, B. Homogeneous synthesis of

chitin-based acrylate superabsorbents in NaOH/urea solution.

Carbohydr. Polym. 2013, 94, 261–271.

[10]Hussien, R.A.; Donia, A.M.; Atia, A.A. Studying some

hydro-physical properties of two soils amended with kaolinitemodified cross-linked poly-acrylamides. Catena 2012, 92,

172–178.