A chemo-mechanical model for biogenic sulphide corrosion of concrete. (October 2022)

• Record Type: Journal Article
• Authors: Rooyackers, F.A.M.; Bosco, E.; Suiker, A.S.J.; Clemens, F.H.L.R.
• Is Part Of: Cement and concrete research. Volume 160(2022)
• Publication Date: 2022-10
• Subjects: Sulphate attack -- Concrete sewer systems -- Diffusion-reaction equations -- Continuum damage model -- Coupled physics processes; Cement -- Periodicals; Cement -- Research -- Periodicals; Concrete -- Periodicals; Concrete -- Research -- Periodicals; Ciment -- Périodiques; Béton -- Périodiques; Cement; Concrete; Periodicals; 620.135
• DOI: 10.1016/j.cemconres.2022.106809
• Languages: English
• ISSNs: 0008-8846

Abstract

Abstract: A chemo-mechanical model is presented for the simulation of biogenic sulphide corrosion in concrete sewer pipes. The chemical model is formulated in terms of a system of coupled diffusion-reaction equations, which describe the processes of calcium hydroxide dissolution, calcium silicate hydrate dissolution and gypsum formation. The chemical problem is two-way coupled with a mechanical model that captures the damage processes caused by mechanical deformations, calcium silicate hydrate dissolution and gypsum formation. A set of numerical analyses illustrates that the model realistically simulates the growth of a gypsum corrosion layer and the consequent damage development in the concrete material. A validation experiment is performed that mimics the chemical process of biogenic sulphide corrosion, from which it is confirmed that the chemo-mechanical model adequately simulates both the shape of the experimental corrosion profile and the square root time development of the corrosion depth.