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Synthesis and performance of internal curing SAP for mitigating adverse effects on cement paste fluidity and strength
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DOI：10.1016/j.jobe.2026.116862.png)
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Abstract
En 中文
• Two novel series SAPs, V series and SiV series, were developed through VTMS and Na2SiO3·9H2O-VTMS modification.Two series of SAPs were synthesized via Vinyltrimethoxysilane (VTMS) modification (V-series) and Na2SiO3·9H2O-VTMS modification (SiV-series), and the results showed that these modifications markedly altered the water-absorption characteristics of the SAPs. • The modified SAPs exhibited progressive absorption, suppressing early water absorption during mixing.Due to the cross-linking effect of Si–OH groups generated by VTMS hydrolysis, both V-series and SiV-series SAPs reduced the initial water absorption of SAPs in cement paste during mixing, and the reduction became more pronounced with increasing VTMS dosage. The fluidity reductions of V5 and SiV5, representative samples of the V- and SiV-series, were only 3.2% and 2.9%, respectively, compared with 13.8% for unmodified SAP. • VTMS modification markedly enhancing the compressive strength relative to that containing the unmodified SAP.Compared with the unmodified SAP, VTMS-modified V-series SAPs markedly reduced water absorption during mixing while only slightly affecting that at final setting (due to the cleavage of Si-O-Si). Among them, V3 exhibited the largest increase in water absorption from mixing to final setting, thereby lowering the effective water-to-cement ratio and leading to a 14.4% increase in the compressive strength of the corresponding cement paste relative to that containing the unmodified SAP. • Compared with V series SAPs, SiV series SAPs produced a greater improvement in the strength of cement paste.Among the SiV-series SAPs, SiV5 exhibited the largest reduction in water absorption at final setting and the lowest SAP-induced porosity, resulting in a 21.3% increase in the compressive strength of the corresponding cement paste compared with that containing unmodified SAP. • At high VTMS contents, both VTMS modification and Na2SiO3·9H2O-VTMS modification markedly reduced autogenous shrinkage.
Keywords:
Superabsorbent polymer
Molecular structure
Modfication
Autogenous shrinkage
Internal curing
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7.4
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1.6W
Citations:
6.6W
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