In this study, we investigated the mechanical performance and durability of supersulfated pastes (SSP) formulated with locally sourced pumice (PM) activated by a two-stage NaOH process, proposed as a low-carbon alternative to Portland cement (PC) for protective coatings in marine environments. The novelty of this work lies in the development of a supersulfated paste for coating that uses local pumice activated with NaOH as the main cementitious material, reaching PC substitutions up to 50%. Seven formulations were prepared, including a PC control, with varying proportions of PM, PC, hemihydrate, and Ca(OH)2, cured for 28, 56, and 90 days, and subsequently exposed to an accelerated regimen of marine aerosols. Compressive strength, carbonation depth, chloride penetration, and moisture absorption were quantified as key indicators of durability. According to the results, SSP consistently outperformed PC control in all four durability parameters. Statistical analysis confirmed significant improvements in carbonation resistance, chloride resistance, and moisture absorption from 56 days after curing. Overall, SSP containing 30% PC, and 70% supersulfated components (SC), as well as those with 40% PC and 60% SC, demonstrated superior strength and durability compared to the control sample. In addition, the properties of the supersulfated pastes improved markedly after 56 days, cementing their potential as durable coating materials for coastal environments.
Citation: Kenson Noel, David Reyes-Gonzalez, Rodrigo Vivar-Ocampo, Pablo J. Lopez-Gonzalez, Gustavo Martinez Castellanos. Effect of the sea breeze on the durability of pumice-based supersulfated pastes under accelerated conditions[J]. AIMS Materials Science, 2026, 13(1): 1-29. doi: 10.3934/matersci.2026001
In this study, we investigated the mechanical performance and durability of supersulfated pastes (SSP) formulated with locally sourced pumice (PM) activated by a two-stage NaOH process, proposed as a low-carbon alternative to Portland cement (PC) for protective coatings in marine environments. The novelty of this work lies in the development of a supersulfated paste for coating that uses local pumice activated with NaOH as the main cementitious material, reaching PC substitutions up to 50%. Seven formulations were prepared, including a PC control, with varying proportions of PM, PC, hemihydrate, and Ca(OH)2, cured for 28, 56, and 90 days, and subsequently exposed to an accelerated regimen of marine aerosols. Compressive strength, carbonation depth, chloride penetration, and moisture absorption were quantified as key indicators of durability. According to the results, SSP consistently outperformed PC control in all four durability parameters. Statistical analysis confirmed significant improvements in carbonation resistance, chloride resistance, and moisture absorption from 56 days after curing. Overall, SSP containing 30% PC, and 70% supersulfated components (SC), as well as those with 40% PC and 60% SC, demonstrated superior strength and durability compared to the control sample. In addition, the properties of the supersulfated pastes improved markedly after 56 days, cementing their potential as durable coating materials for coastal environments.
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