Table 2 The absorption capacity of SAP (n = 3) in demineralized water and cement slurry [g/g SAP], absorption capacity of SAP during mixing of a cement paste [g/g SAP], and swelling time until full saturation of particles is achieved [s] with respective standard deviations.

From: The water kinetics of superabsorbent polymers during cement hydration and internal curing visualized and studied by NMR

Method

SAP A

SAP B

Ī”m/m de-ionised water (pH = 6.5)

305.0 ± 3.7 g/g SAP

283.2 ± 2.4 g/g SAP

Ī”m/m cement slurry (pH = 12.8)

61.0 ± 1.0 g/g SAP

58.4 ± 1.7 g/g SAP

Δm/m during cement paste mixing

23 g/g SAP

11 g/g SAP

Swelling time

10 ± 2 s

60 ± 5 s