Engineering of existing structures

Engineering of existing structures, built estate, range of most frequent issues, socio-economic aspects, sustainable development, overview of normative documents worldwide, systematic stepwise approach according to SIA 269 Annex A, material and immaterial value, requirements, terminology.

Classification of deterioration mechanisms, Tuutti model, exposure classes, structure of cementitious composites, transport mechanisms, chlorides, carbonation, corrosion, probabilistic approach

Corrosion, Cracking and effects, Freeze-thaw, Alkali Aggregate Reaction (AAR), Swelling reactions with sulfates.

Thermo-hygro mechanical effects, restraint, delayed response, mitigation techniques, cooling of fresh concrete.

Examination: stepwise approach, condition survey, principles and approach, examination, updating, verification concepts.

In-depth examination: methodology, visual survey, characterization of cover concrete properties (permeability, depth, resistivity), location of rebar, electrochemical potential measurements, GPR (Radar).

Intervention: Realkalization, chloride extraction, cathodic protection, surface treatments, concrete restoration, applications of UHPFRC for protection.

Examination: Updating of actions (dead loads, traffic loads, climatic actions), structural analysis models, accidental actions.

Examination: Updating of resistances (material properties, resistance models), verification of structural safety and serviceability.

In-depth examination, updating by semi-probabilistic analysis, required safety level, condition assessment.

Overview of reinforcement methods (including additional external prestressing), structural members formed of R-UHPFRC and RC, bending and shear, local effects, joints, design criteria.

Reinforcement with glued CFRP lamellas.

Intervention recommendation: overview, proportionality, cost-benefit ratio, LCA, recapitulation of the course contents.