Abstract
The absorption and desorption of superabsorbent polymers (SAPs) in cement mixtures containing two different glass powders as supplementary cementitious materials are examined in this paper. Two SAPs with different chemical compositions were synthesized in-house and used in the experiments. SAP absorption was investigated directly through the mass change of SAPs in cement slurries, as well as indirectly using the flow test. Scanning electron microscopy was used to monitor the desorption of SAPs using samples prepared with freeze-drying. Hydration and setting time were evaluated to explain the desorption behavior of SAPs. SAP absorption generally increased in pastes with glass powders. The desorption rate of SAPs in different pastes was shown to correlate with the onset of solid skeleton development in the pastes. The addition of SAPs reduced autogenous shrinkage in neat cement paste more than in pastes with glass powders.
Highlights
Cementitious materials with low water/binder can be susceptible to autogenous shrinkage cracking [1]
This paper aims to investigate the interaction between Superabsorbent polymers (SAPs) and cement mixtures containing two types of glass powder as supplementary cementitious materials
Note that S-A and S-B showed a significantly lower absorption in slurries compared to their absorption in distilled water, which was approximately 130 (g/g) and 85 (g/g), respectively
Summary
Cementitious materials with low water/binder can be susceptible to autogenous shrinkage cracking [1]. Autogenous shrinkage cracking is a critical durability issue in cementitious materials characterized with low water/binder [4]. In mixtures with low water/binder, self-desiccation leads to a reduction in relative humidity, creation of menisci at the air–pore solution interface, and development of the capillary forces in the pore solution [5,6]. The capillary forces pull the solid skeleton inward leading to an overall reduction in the volume of the material. If the material is constrained against volume changes, tensile stresses are developed and cracking occurs when the tensile strength of the material is reached
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