Influence of superabsorbent polymers (SAPs) type and particle size on the performance of surrounding cement-based materials

Tan, Yawen; Lu, Xiaosong; He, Rui; Chen, Huaxin; Wang, Zhenjun

doi:10.1016/j.conbuildmat.2020.121442

Cited by 40 publications

(17 citation statements)

References 42 publications

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“…The amount and distribution of pores are considered as limiting factors for the strength of composite materials, and the presence of larger pores poses a negative phenomenon that may limit the application of SAP-modified materials. According to the available literature, the surrounding zone around SAP particles and their formation is essential for the hardened state properties of cement composites, the strength in particular [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Secondary Porosity on Microstructure and Mechanical Properties of SAP-Containing Lime-Based Plasters

et al. 2022

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Despite the many benefits associated with the utilization of superabsorbent polymers (SAPs), several drawbacks have been reported. In particular, the effect of SAPs on microstructure, together with its consequences for mechanical properties, is not fully understood yet for some composite materials. This study analyzes the role of SAPs in the formation of the microstructure of lime composites, taking into account their chemical composition. The obtained experimental results show that the particle size and cross-linking density of used SAPs are crucial parameters affecting both the microstructure and mechanical performance of the analyzed composites. Coarser SAPs with low cross-linking density in the dosage of 0.5 and 1 wt.% are found as the most suitable solution, leading even to a slight improvement of mechanical parameters. The secondary porosity formed by swelled hydrogels is identified as a very significant factor since hydrogel-filled voids do not contribute to the strength parameters. The formation of the affected zone around SAP cores depends on the chemical composition of SAPs considerably as the higher cross-linking density influences the desorption rate. Based on achieved results, utilization of SAPs in building materials should be studied at a more detailed level with particular importance on the definition of SAP-related voids and affected zone around SAP particles.

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Section: Resultsmentioning

confidence: 99%

Effects of Secondary Porosity on Microstructure and Mechanical Properties of SAP-Containing Lime-Based Plasters

et al. 2022

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“…As discussed in the research paper of Tan et al [ 47 ], the total pore volume in cement pastes (data about plaster are not available) is usually higher compared to paste without SAP admixture as a result of formed voids. The increase in porosity can also be partially attributed to water release under osmotic pressure in the form of free water and the formation of capillary pores [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, a consequent exposure of SAPs to water promoted a reswelling that created small cracks on samples with high SAP dosage, acting as preferential paths for liquid water transport as described by Liu et al [ 52 ]. Nonetheless, this effect was not manifested in PH samples, as the internal stress driven by SAP swelling did not exceed the strength of the material [ 47 ]. Our results are contradictory with the findings of Senff et al, who described the adverse effect of SAP admixture on water absorption based on a limited volume of interconnected pores.…”

Section: Resultsmentioning

confidence: 99%

Functional Properties of SAP-Based Humidity Control Plasters

et al. 2021

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The application of materials with high moisture storage capacity close to the interior surface presents a prospective passive method for improving indoor relative humidity conditions. In this paper, lime-cement plasters containing three different types of superabsorbent polymers (SAPs) in varying dosages are introduced and their mechanical, hygric, and thermal characteristics are analyzed in a relation to microstructure. The experimental results show a significant effect of both SAP amount and chemical composition on all functional properties of studied plasters. The incorporation of 1.5% of SAP may induce up to 2.5 better moisture buffering, thus significantly improving the passive humidity control capability. Considering overall functional parameters of SAP-modified plasters, the dosage of 1 wt.% can thus be viewed as a rational compromise between the moisture storage capability and mechanical properties. The obtained wide sets of parameters can be utilized directly as input data of computational models suitable for the assessment of the interior microclimate of residential and administrative buildings.

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“…On the 28th day of hardening, concrete with 0.33% dosage of SAP has up to 5% higher compressive strength. Tan, Y., Lu, X., He, R., Chen, H., & Wang, Z. also showed that SAP addition do not cause notable decrease in strength at 28 days of hardening [10].…”

Section: Introductionmentioning

confidence: 92%