Numerical modelling of porous cement-based materials by superabsorbent polymers

Viejo, Ismael; Esteves, Luís Pedro; Laspalas, Manuel; Bielsa, J. M.

doi:10.1016/j.cemconres.2016.07.018

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…Cement mortar with a water-to-cement ratio of 0.42 is prone to self-shrinkage. Based on the model of Powers and Brownyard [13], the amount of entrained water needed in the SAP can be calculated and amounts to an entrained water-to-cement ratio (w/c) e of 0.06 [16]. Therefore, the effective water-to-cement ratio of cement mortar is 0.42 (w/c) ref and the total water-to-cement ratio is 0.48 (w/c) tot .…”

Section: Methodsmentioning

confidence: 99%

“…SAP is often introduced to cement-based materials as a promising new internal curing material for concrete [13,14]. When SAP is exposed to cement-based mixtures, a transition in the osmotic pressure gradient and chemical potential occurs between the inside and outside of the three-dimensional network leading to water absorption and storage of the SAP [15,16,17].…”

Section: Introductionmentioning

confidence: 99%

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Performances of Cement Mortar Incorporating Superabsorbent Polymer (SAP) Using Different Dosing Methods

et al. 2019

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Modified cement mortar was prepared by incorporating a superabsorbent polymer (SAP) with two kinds of dosing state, dry powdery SAP and swelled SAP (where the SAP has been pre-wetted in tap water), respectively. The mechanical properties, drying shrinkage and freeze–thaw resistance of the mortars were compared and analyzed with the variation of SAP content and entrained water-to-cement ratios. Additionally, the effect of SAP on the microstructure of mortar was characterized by scanning electron microscopy (SEM). The results indicate that agglomerative accumulation is formed in the voids of mortar after water desorption from SAP and there are abundant hydration products, most of which are C-S-H gels, around the SAP voids. The incorporation of the powdery SAP increases the 28 d compressive strength of the mortars by about 10% to 50%, while for the incorporation of swelled SAP, the 28 d compressive strength of the mortar can be increased by about −26% to 6%. At a dosage of 0.1% SAP and an entrained water–cement ratio of 0.06, the powdery SAP and the swelled SAP can reduce the mortar shrinkage rate by about 32.2% and 14.5%, respectively. Both the incorporation of powdery and swelled SAP has a positive effect on the freeze–thaw resistance of cement mortar. In particular, for powdery SAP with an entrained water-to-cement ratio of 0.06, the mass loss rate after 300 cycles is still lower than 5%.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performances of Cement Mortar Incorporating Superabsorbent Polymer (SAP) Using Different Dosing Methods

et al. 2019

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“…9a, experimental specimens of PMMA and nanocomposites have elastic behavior, which agreed with previous studies. 32,34 It can be found that when the amount of CNTs has increased, the fracture occurs at lower values of % ε . Also, Fig.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation and finite element modelling of PMMA/carbon nanotube nanobiocomposites for bone cement applications

et al. 2022

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“…They can not only absorb water at more than several hundred times their own weight but also retain absorbed water even under a certain pressure . Therefore, SAPs are widely used in many fields, such as healthcare products, agriculture and horticulture, architecture, wastewater treatment, communication cables, coal dewatering, wound dressings, and aircraft fuel treatments . Recently, researchers have increasingly desired to further develop SAPs by obtaining polymers with a high water absorption, fast swelling rate ( Q t ), and good gel strength properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a fast‐swelling superabsorbent resin by inverse suspension polymerization

Zhang

et al. 2017

J of Applied Polymer Sci

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A novel, fast-swelling superabsorbent polymer (SAP2) was fabricated with an anionic-nonionic surfactant [poly(oxy-1,2ethanediyl)-(3-carboxy-1-oxo-3-sulfopropyl)-(nonylphenoxy) sodium salt] as the stabilizer by inverse suspension polymerization. The microstructure, chemical structure, and gel strength of the superabsorbent polymers (SAPs) were characterized by scanning electron microscopy, porosity, and specific surface area analysis, Fourier transform infrared spectroscopy, and rheometry. The results show that SAP2 had irregularly shaped particles with a large number of pores and presented a greater specific surface area, pore volume, and gel strength than the prepared SAP1 with a nonionic surfactant (Span 60) as the stabilizer. The amount of residual monomer and the gel fraction of SAP2 were 202 mg/kg and 80.6%, respectively. Meanwhile, SAP2 demonstrated a faster swelling and deswelling rate as well as greater water absorbency than SAP1. The fast swelling rate mainly resulted from the capillary effect of the pores in the irregularly shaped particles. Superfast swelling SAPs should possess outstanding potential for healthcare products, communication cables, and the biomedical field.

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Numerical modelling of porous cement-based materials by superabsorbent polymers

Cited by 15 publications

References 28 publications

Performances of Cement Mortar Incorporating Superabsorbent Polymer (SAP) Using Different Dosing Methods

Performances of Cement Mortar Incorporating Superabsorbent Polymer (SAP) Using Different Dosing Methods

Experimental investigation and finite element modelling of PMMA/carbon nanotube nanobiocomposites for bone cement applications

Fabrication of a fast‐swelling superabsorbent resin by inverse suspension polymerization

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