Experimental Study of a Superabsorbent Polymer Hydrogel in an Alkali Environment and Its Effects on the Mechanical and Shrinkage Properties of Cement Mortars.

A decreasing trend was also noted in SAP-b, SAP-c, and SAP-d, with reductions of 29.8%, 45.43%, and 43.89%, respectively, and these gels stabilized at 29.48%, 21.63%, and 16.44%.

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Conversely, at 25 °C, the water absorption capacities were 229, 128, 96.5, and 82.7 g/g, and at −5 °C, they were 182.6, 106.7, 74, and 65.3 g/g, indicating a clear trend of increased water absorption ability with rising liquid temperatures.

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In contrast, the mechanical strength of the cement mortars, assessed through compressive and flexural strength tests, revealed a pronounced sensitivity to all tested variables, particularly the curing time, which showed highly significant p -values across both strength measures.

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