Sulfate Resistance Mechanisms in Cement-Based Materials
Summary
Sulfate resistance in cementitious composites hinges on limiting the ingress and reaction of sulphate ions with cement hydrates, thereby avoiding expansion, cracking and strength loss. In portland cement systems, sulphate ions penetrate through pore networks by diffusion or capillary suction and react primarily with calcium aluminate phases to form ettringite and with portlandite to form gypsum. Both products generate expansive stresses. Strategies to mitigate attack include reducing permeability through low water–cement ratios, optimising pore structure via supplementary cementitious materials (fly ash, slag, silica fume), and employing sulphate-resistant cements rich in tricalcium silicate and low in aluminate content. Advances in microstructural analysis, reactive-diffusion modelling and service-life prediction offer integrated tools for designing durable concretes for marine, saline-soil and industrial environments.
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Sulfate Resistance Mechanisms in Cement-Based Materials publication trend
The graph below shows the total number of articles in sulfate resistance mechanisms in cement-based materials across all publications each year (not limited to Nature Index journals).
Technical terms
Ettringite: A needle-like calcium sulfoaluminate hydrate whose formation in pores induces expansion and cracking.
Gypsum: Calcium sulfate dihydrate produced by sulphate attack on portlandite, contributing to internal stress.
Capillary action: Movement of sulfate-bearing solution through concrete pores driven by surface tension.
Reactive-diffusion model: Computational approach coupling ion transport with chemical reactions to predict phase formation and damage.
Supplementary cementitious materials: Mineral admixtures (e.g. fly ash, slag) used to refine pore structure and bind sulphate ions.
References
- Degradation of concrete in marine environment under coupled chloride and sulfate attack: A numerical and experimental study. Case Studies in Construction Materials (2022).
- Damage modelling in concrete subject to sulfate attack. Fracture and Structural Integrity (2014).
- Unidirectional penetration approach for characterizing sulfate attack mechanisms on cement mortars and pastes. Cement and Concrete Research (2023).
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