The influence of SAP particle size and extra water on the dynamic mechanical behavior of SAP-modified cement-based composites

Yang, Haitao; Liu, Miao; Bian, Hongjian; Wu, Lipeng; Liu, Juanhong; Wang, Wei

doi:10.1016/j.conbuildmat.2022.128622

Cited by 12 publications

(4 citation statements)

References 52 publications

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“…This decrease can be attributed to the swelling of SAP particles, which creates the internal pores of the mortar specimen, resulting in a reduction in compressive strength. This phenomenon is consistent with that which was reported in Yang and Sun’s study [ 42 , 43 ]. The addition of SAP leads to a reduction in the compressive strength of the mortar, and the compressive strength of the SCA2 and SCA4 specimens is higher than that of the SAP specimens.…”

Section: Resultssupporting

confidence: 94%

The Effects of Crystalline Admixture on the Self-Healing Performance and Mechanical Properties of Mortar with Internally Added Superabsorbent Polymer

Zhang

Liu

et al. 2023

Materials

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Crystalline admixture (CA) can be incorporated into concrete to achieve self-healing of concrete cracks. In this study, both CA and superabsorbent polymer (SAP) were used as self-healing agents to investigate the effects of CA on the self-healing performance and mechanical properties of mortar with internally added SAP at different self-healing ages. The healing effect of cracks in mortar is assessed by crack observation and impermeability. The structure and composition of the filler in the cracks were analyzed by microscopic experiment. The experimental results indicate that CA enhances the healing of cracks in mortar specimens. The chemical reactions of CA primarily contribute to significantly improving the early-age crack-healing ability of the specimens, and the water absorption and expansion ability as well as the internal curing effect of SAP also facilitate the crack-healing process. Increasing the CA content leads to an increase in the Ca/Si ratio of C-S-H, causing a transition from a layered structure to a more compact needle-like structure. When 4% CA was added to the mortar, it resulted in an adequate formation of needle-like C-S-H structures, which eventually penetrate and fill the pits formed by SAP, compensating for the strength loss caused by SAP.

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Section: Resultssupporting

confidence: 94%

The Effects of Crystalline Admixture on the Self-Healing Performance and Mechanical Properties of Mortar with Internally Added Superabsorbent Polymer

Zhang

Liu

et al. 2023

Materials

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“…When the cement paste is compressed, the compressive stress is transferred from the external cement matrix to the elastic particles. The elastic particles form a structural deformation center within the cement paste matrix, which can limit the generation and development of strain microcracks, absorb strain energy, and improve the elasticity of the cement paste [ 40 , 41 , 42 ]. At the same time, when the cement sample is impacted by external loads, the crystal particles are the transmission medium of the impact force.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Polymer Elastic Particles Modified with Nano-Silica on the Mechanical Properties of Oil Well Cement-Based Composite Materials

Wang,

Xu,

Qin

et al. 2023

Polymers

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The integrity of oil well cement sheaths is closely related to the long-term production safety of oil and gas wells. The primary material used to form a cement sheath is brittle. In order to reduce the brittleness of oil well cement and improve its flexibility and resistance to stress damage, nano-silica was used to modify polymer elastic particles, and their properties were analyzed. The influence of the modified polymer particles on the properties of oil well cement-based composite materials was studied, and the microstructure of the polymer particle cement sample was analyzed. The results showed that nano-silica effectively encapsulates polymer particles, improves their hydrophilicity, and achieves a maximum temperature resistance of 415 °C. The effect of the modified polymer particles on the compressive strength of cement sample is reduced. Polymer particles with different dosages can effectively reduce the elastic modulus of cement paste, improve the deformation and elasticity of cement paste, and enhance the toughness of cement paste. Microstructural analysis showed that the polymer particles are embedded in the hydration products, which is the main reason for the improvement in the elasticity of cement paste. At the same time, polymer particle cement slurry can ensure the integrity of the cement sample after it is impacted, which helps to improve the ability of oil well cement-based composite materials to resist stress damage underground.

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“…The free water absorbed by the SAP can be continuously released into the solid waste lling body throughout the hydration process, contributing to su cient hydration and consolidation of the solid waste blocks. Moreover, at the same mass, smaller SAP particles have a broader spatial distribution within the solid waste concretion, allowing for more uniform absorption and release of free water, which also enhances the compressive strength of the blocks [39,40].…”

Section: In Uence Of Sap Particle Size On Compressive Strengthmentioning

confidence: 99%

“…Furthermore, smaller SAP particles had a larger speci c surface area and increased contact with water in the solid waste paste. The enhanced contact area facilitated water transmission through capillary action between y ash and slag particles, weakening the steric effect of these particles [39,40]. Consequently, water absorption by the SAP increased, and free water in the external solution of the SAP decreased, leading to lower uidity of the paste.…”

Section: In Uence Of Sap Particle Size On Uidity and Setting Timementioning

confidence: 99%

Influence of superabsorbent polymer (SAP) content, particle size and sodium silicate modulus on the performance of fly ash-slag paste filling materials

Ma,

Zhang,

Tang

et al. 2024

Preprint

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The use of solid waste cementitious materials in coal mining and mine filling applications has been limited by substantial volume shrinkage and inadequate hydration. This study explored the incorporation of a novel SAP to improve the workability of solid waste filling materials. We examined the impact of SAP content, particle size, and sodium silicate modulus on the workability and mechanical properties through fluidity, setting time, compressive strength, and drying shrinkage tests. The water absorption and release mechanism of the SAP, along with its effects on workability and mechanical properties, were investigated using nuclear magnetic resonance, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Our findings demonstrated that optimizing the SAP content, particle size, and sodium silicate modulus significantly enhanced the workability, stability, pumpability, and compressive strength of fly ash-slag paste filling materials. Our findings offer insights for modifying and developing solid waste filling materials and executing practical mine filling projects.

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The influence of SAP particle size and extra water on the dynamic mechanical behavior of SAP-modified cement-based composites

Cited by 12 publications

References 52 publications

The Effects of Crystalline Admixture on the Self-Healing Performance and Mechanical Properties of Mortar with Internally Added Superabsorbent Polymer

The Effects of Crystalline Admixture on the Self-Healing Performance and Mechanical Properties of Mortar with Internally Added Superabsorbent Polymer

The Effect of Polymer Elastic Particles Modified with Nano-Silica on the Mechanical Properties of Oil Well Cement-Based Composite Materials

Influence of superabsorbent polymer (SAP) content, particle size and sodium silicate modulus on the performance of fly ash-slag paste filling materials

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