Effect of internal curing by alkali-resistant superabsorbent polymers on workability, mechanical property, hydration, pore structure and shrinkages of high-performance cementitious materials
Source abstract
Abstract
This study investigates an alkali-resistant superabsorbent polymer (SAP-I) for cement-based materials, featuring a specialized "claw" distribution in concrete structures after pre-absorption water. To evaluate the performance changes in cement-based materials with SAPs, we compared laboratory-prepared alkali-resistant SAP (SAP-I) with commercially available ones (SAP-S). Firstly, the alkali-resistant SAP's adsorption capacity in tap water (185 g/g) is similar to commercial SAPs. However, its adsorption capacity in cement pores (21.63 g/g) far exceeds that of commercial SAPs (2.67 g/g), indicating a more significant internal curing effect. Secondly, the strength increase in cement-based materials with alkali-resistant SAP is significantly greater than with commercial SAPs. The alkali-resistant SAP maintains higher internal relative humidity in cement-based materials, promoting hydration and compensating for pore structure degradation. Thirdly, adding alkali-resistant SAP significantly improves the shrinkage performance of cement-based materials, with SAP-I having a mitigate shrinkage 2.11 times that of commercial SAPs. The combination of SAP particles with the cement forms an organic-inorganic interface, ensuring more uniform water release and significantly reducing autogenous shrinkage effects. In summary, compared to commercial SAPs, alkali-resistant SAPs show better compatibility with cement-based materials and greater potential for large-scale production, making them suitable for specific engineering applications. • The effect of the alkali-resistant superabsorbent polymers on the properties of cement-based materials was investigated. • Compares the effect of alkali-resistant SAP and commercial SAP on the cement-based materials. • Alkali-resistant SAP significantly reduced the autogenous shrinkage and slight increase the compressive strength of cement-based materials. • Properties of the cement-based materials containing alkali-resistant SAP was satisfactory.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete Properties and Behavior · Concrete and Cement Materials Research · Fire effects on concrete materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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