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Lecture

Concrete Durability: Mechanisms and Prevention

In course

MSE-322: Building materials + Laboratory work

Science des matériaux de construction non métalliques les plus utilisés et plus particulièrement des matériaux cimentaires (béton). Composition chimique, fabrication et comportement sur la durée. ...

Description

This lecture covers the mechanisms of concrete degradation, including reinforcement corrosion due to chlorides and carbonation. It explains diffusion phenomena in concrete, laboratory tests for corrosion, and preventive measures such as controlling chloride exposure. The instructor discusses the impact of freeze-thaw cycles, alkali granulate reaction, and acid attacks on concrete structures, emphasizing the importance of material-environment interaction. Various exposure classes according to standards are detailed, along with diagnosis and repair techniques for corroded structures. The lecture highlights the significance of concrete quality, porosity effects, and the role of cement paste in enhancing durability.

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Instructors (3)

Emmanuelle Anne Boehm Courjault

Karen Scrivener

De nationalité anglaise, Karen Scrivener est née en 1958. Au cours de sa carrière, ses travaux et sa recherche traitaient des domaines suivants: Identification du développement microstucturale pendant l'hydratation du ciment. Elaboration d'une approche multitechnique pour étudier la microstucture des ciments et bétons, avec accent sur la quantification par analyse des images d'électrons retrodiffusés. Caractérisation de l'auréole de transition de la pâte de ciment autour des granulats. Compréhension des processus de dégardation des bétons, en particulier le gonflement lié à la formation de l'éttringite retardée dans les bétons étuvés.

Lionel Sofia

Official source

Ontological neighbourhood

Chemical engineering

Materials science: Concrete

Related concepts (32)

Concrete

Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. When aggregate is mixed with dry Portland cement and water, the mixture forms a fluid slurry that is easily poured and molded into shape.

Reinforced concrete

Reinforced concrete, also called ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars (rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials.

Prestressed concrete

Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" (compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. Tendons may consist of single wires, multi-wire strands or threaded bars that are most commonly made from high-tensile steels, carbon fiber or aramid fiber.

Types of concrete

Concrete is produced in a variety of compositions, finishes and performance characteristics to meet a wide range of needs. Modern concrete mix designs can be complex. The choice of a concrete mix depends on the need of the project both in terms of strength and appearance and in relation to local legislation and building codes. The design begins by determining the requirements of the concrete. These requirements take into consideration the weather conditions that the concrete will be exposed to in service, and the required design strength.

Precast concrete

Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and maneuvered into place; examples include precast beams, and wall panels for tilt up construction. In contrast, cast-in-place concrete is poured into site-specific forms and cured on site. Recently lightweight expanded polystyrene foam is being used as the cores of precast wall panels, saving weight and increasing thermal insulation.

Related lectures (30)

Concrete Durability: Carbonation and Chlorides

Explores concrete carbonation, reinforcement corrosion, prevention, and repair strategies, focusing on chlorides and freeze-thaw cycles.

Concrete Durability: Corrosion and Repair

Discusses concrete corrosion, freeze-thaw impact, alkali reaction, and acid attacks.

Carbonation of Concrete Structures MOOC: Sorption and transport in cementitious materials

Covers carbonation process, corrosion rates, and impact on concrete structures.

Chloride Ingress and Corrosion MOOC: Sorption and transport in cementitious materials

Explores the impact of chloride ingress on concrete structures and the mechanisms involved in corrosion.

Chloride Binding and pH Effects MOOC: Sorption and transport in cementitious materials