The Water Absorption-release of Superabsorbent Polymers in Fresh Cement Paste: An NMR Study

In recent years, superabsorbent polymers (SAPs) are considered as promising material for internal curing of cement-based materials, however, the relationship between SAPs structure and its performance are still unclear. In this paper, SAPs with different water absorption and size were selected to discuss their effect on autogenous deformation of cement paste and strength of mortars. Results indicated that SAPs with large-size and high-water absorption had positive effect on autogenous shrinkage reduction. The influence of SAPs on mortar mechanical properties revealed that SPAs seemed to have no negative effect on the strength of cement past. The increase of the strength might be from the decreased water/cement (w/c) ratio due to the water absorption by SAPs.

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Setting Characteristics, Mechanical Properties and Microstructure of Cement Pastes Containing Accelerators Mixed with Superabsorbent Polymers (SAPs): An NMR Study Combined with Additional Methods

Materials ◽

10.3390/ma12020315 ◽

2019 ◽

Vol 12 (2) ◽

pp. 315 ◽

Cited By ~ 1

Author(s):

Yanliang Ji ◽

Zhenping Sun ◽

Chao Chen ◽

Leo Pel ◽

Ahmed Barakat

Keyword(s):

Cement Paste ◽

Water Distribution ◽

Setting Time ◽

Scattered Electron ◽

Superabsorbent Polymers ◽

Cement Pastes ◽

X Ray ◽

Nmr Relaxometry ◽

Nmr Study ◽

Internal Relative Humidity

In this study, the setting property and mechanical strength of cement pastes containing accelerators (CPCA) with or without superabsorbent polymers (SAPs) were first studied. The early microstructure evolution and water distribution at 7 and 28 days were probed by 1D (T2) and 2D (T1-T2 maps) H1 nuclear magnetic resonance (NMR) relaxometry, and the microstructure was systematically investigated by using mercury intrusion porosimetry (MIP), back-scattered electron (BSE) image and energy-dispersive X-ray spectroscopy (EDX) analysis. Results showed that the SAPs in the cement paste containing accelerators had various influences on setting time and compressive strength depending on the type of accelerators. The presence of SAPs in the cement paste containing alkaline free accelerators could alleviate the decrease of internal relative humidity, promote hydration and help to modify the pore structure. Moreover, it was observed that the SAP cavities could be nicely filled with calcium hydroxide (CH) in the cement paste with alkaline free accelerators.

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An original test method to assess water absorption/desorption of lightweight aggregates in presence of cement paste

Construction and Building Materials ◽

10.1016/j.conbuildmat.2017.07.236 ◽

2017 ◽

Vol 154 ◽

pp. 752-762 ◽

Cited By ~ 5

Author(s):

Latifou Bello ◽

Eric Garcia-Diaz ◽

Patrick Rougeau

Keyword(s):

Water Absorption ◽

Cement Paste ◽

Test Method ◽

Lightweight Aggregates

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Super Absorbent polymers and their Composites for Application in Agriculture

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.38048 ◽

2021 ◽

Vol 9 (9) ◽

pp. 665-672

Author(s):

Aryan Dwivedi

Keyword(s):

Mechanical Property ◽

Water Absorption ◽

Soil Water ◽

Water Retention ◽

Hydraulic Parameters ◽

Dryland Agriculture ◽

Superabsorbent Polymers ◽

Over Time

Abstract: In dryland agriculture, Superabsorbent Polymers (SAPs) are popular. However, the mechanical property, repetitive soil water absorption and release, regularly affects the water retention and hydraulic parameters of the soil, and since this property decreases progressively over time, the results of the property appear to be unpredictable. Polymers use to in agriculture field.

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