Microstructural refinement of cement paste internally cured by polyacrylamide composite hydrogel particles containing silica fume and nanosilica
| Autor: | Baishakhi Bose, Kendra A. Erk, Cole R. Davis |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Silica fume Composite number Polyacrylamide technology industry and agriculture 0211 other engineering and technologies macromolecular substances 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology chemistry.chemical_compound Compressive strength chemistry 021105 building & construction Void (composites) Self-healing hydrogels General Materials Science Cementitious Composite material 0210 nano-technology Curing (chemistry) |
| Zdroj: | Cement and Concrete Research. 143:106400 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2021.106400 |
| Popis: | Supplementary cementitious materials were incorporated into hydrogel-based internal curing agents to improve the hydration, microstructure, and ultimately strength of internally cured high-performance cement paste. Polyacrylamide composite hydrogel particles containing amorphous silica – either silica fume or nanosilica – and two different polymer network crosslink densities were synthesized and incorporated into cement paste. The presence of silica and low crosslink density increased the absorption capacity of the particles in pore solution. Micrographs of internally cured paste indicated a significant improvement in hydrogel-related void-filling ability and an increase in void size for low crosslink density particles containing silica. Compressive strength and electrical resistivity increased at later ages for paste samples containing particles with higher silica dosage. The relationship between extent of hydration, void size, and void-filling activity was found to strongly influence the paste's long-term strength and is thus an important structure-property relationship to consider when selecting hydrogels for internal curing purposes. |
| Databáze: | OpenAIRE |
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