Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

New Trends in Concrete: Admixtures and High Performance Concrete

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 use of adjuvants in concrete, such as accelerators, retarders, and superplasticizers, which modify its properties. It also explores recent developments like self-compacting concrete and ultra fiber-reinforced concrete. The presentation delves into the impact of adjuvants on concrete performance, durability, and cost. Additionally, it discusses the importance of air entrainers for frost resistance and the role of viscosity agents in preventing concrete segregation. The lecture highlights the advancements in high strength concrete technology, including the use of mineral additives and thickeners to enhance concrete properties. It also examines the history and mechanisms of superplasticizers, as well as the application of accelerators in concrete construction.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Instructors (3)

Lionel Sofia

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.

Official source

Related concepts (31)

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.

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.

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.

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 (32)

Adjuvants and New Concretes

Explores the use of adjuvants in concrete and the development of new concrete technologies.

Concrete Bridges: Design and Construction

Covers the design and construction of concrete bridges, focusing on integral bridges and potential problems.

The Monument: Retaining the Ground

Delves into the construction of the Bibliothèque's lower level and its unique features.

Concrete Durability: Carbonation and Chlorides

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

Concrete: Material Properties and Future Implications