Acid Resistance of Cementitious Materials in Aggressive Environments

Cementitious materials are the backbone of modern infrastructure, yet they are intrinsically vulnerable to acid attack in many service conditions. Acidic environments arise in wastewater and sewer systems, industrial effluents, agricultural settings and acid‐producing bioreactors. Attack typically initiates with proton diffusion into the pore network, followed by leaching of calcium and aluminium from binding phases, decalcification of calcium silicate hydrate and precipitation of expansive sulphate salts. Microstructural damage manifests as increased porosity, loss of strength and surface degradation. Global concerns over service life, sustainability and carbon footprint have driven the development of more durable binders and protective strategies. Approaches include optimised Portland cement blends with supplementary cementitious materials, low‐calcium alkali‐activated binders, geopolymers, calcium aluminate cements and surface coatings. Emerging research seeks to elucidate deterioration mechanisms at micro‐ to nano‐scales, standardise test methods under realistic exposures and integrate corrosion monitoring. Practical applications span sewer tunnel linings, biogas digesters, food and chemical plant flooring, and marine structures, where enhanced acid resistance translates into reduced maintenance costs and extended service intervals.

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Acid Resistance of Cementitious Materials in Aggressive Environments publication trend

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Technical terms

Acid attack: Degradation of cementitious matrices by proton ingress, leading to leaching of alkaline phases and loss of structural integrity.

Alkali-activated binder: A cementitious system formed by activating aluminosilicate precursors with alkaline solutions, yielding a three-dimensional network resistant to chemical attack.

Geopolymer: An inorganic polymer binder produced from aluminosilicate materials and alkali activators, noted for high acid resistance and low calcium content.

Leaching: The process by which soluble ions (e.g. Ca²⁺, Na⁺) are extracted from cementitious phases under acid exposure, weakening the matrix.

Neutralisation depth: The penetration distance within concrete at which pH falls below the threshold for intact binding phases, indicating acid ingress severity.

References

1. Acid resistance of alkali-activated binders: A review of performance, mechanisms of deterioration and testing procedures. Construction and Building Materials (2022).
2. Deterioration mechanism of alkali-activated materials in sulfuric acid and the influence of Cu: A micro-to-nano structural, elemental and stable isotopic multi-proxy study. Cement and Concrete Research (2021).
3. Geopolymer, Calcium Aluminate, and Portland Cement-Based Mortars: Comparing Degradation Using Acetic Acid. Materials (2019).