Sustainable Biobased Hydrogel as an Alternative Air-Entrainment Agent in Cement-Based Materials

AbstractThis study synthesized a biobased hydrogel from local and renewable raw materials to improve the freeze–thaw resistance of hardened cementitious matrices. A biobased hydrogel was produced by thermal gelatinization process with different cornstarch contents ranging from 1% to 3% of mortar mix...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2024-11, Vol.36 (11)
Main Authors: Jalal, Asif, Kiran, Ravi
Format: Article
Language:English
Subjects:
Air entrainment
Air-entraining admixtures
Cements
Chemical analysis
Compressive strength
Curing agents
Freeze-thaw durability
Hydrogels
Mortars (material)
Porosity
Raw materials
Reagents
Size distribution
Superabsorbent polymers
Technical Papers
Thermal resistance
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Summary:AbstractThis study synthesized a biobased hydrogel from local and renewable raw materials to improve the freeze–thaw resistance of hardened cementitious matrices. A biobased hydrogel was produced by thermal gelatinization process with different cornstarch contents ranging from 1% to 3% of mortar mixing water. The effectiveness of cornstarch hydrogel was gauged by comparing its void structure with those of two commercially available super absorbent polymers (used at 0.2% of cement weight) and an air-entraining agent (0.49% of total mortar weight). The resulting void structures were analyzed by evaluating porosity, void-size distribution, spacing factor, and shape of voids using microcomputed tomography scanning with a sensitivity of 10 μm. The 3% cornstarch hydrogel produced a robust void structure with high porosity and relatively large number of smaller voids. The high porosity was achieved without a significant reduction in compression strength. Furthermore, chemical analysis revealed that the 3% cornstarch hydrogel had a positive influence on the hydration of cement compared with the commercial air-entrainment agent. Overall, the 3% cornstarch hydrogel can be a sustainable biodegradable replacement for traditional and commercial surfactants for air entrainment, and has an additional internal curing advantage.
ISSN:0899-1561
1943-5533
DOI:10.1061/JMCEE7.MTENG-17763