Free Online Education Presentations

Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.

This Week's Featured Presentation

Recent Innovations for CRCP
by Jeffery Roesler, University of Illinois at Urbana-Champaign

Presentation details

Concrete Pavement Design and Construction Special Session Honoring Dr. Shiraz Tayabji (ACI Spring 2021 Convention, Virtual Sessions) CRCP is known to be high performance pavement type with low maintenance and long service life. It also known to have a higher initial cost relative to other concrete pavement options. This presentation will review some recent findings in four key areas (structural design, materials, support layers, and construction) that can provide a more economical CRCP without sacrificing design life. Specific innovations that will be discussed are active crack control, terminal joint design, internal curing for crack width control and surface durability, macrofibers, transverse post-tensioning, support layers and interfaces, curing, and steel properties (type, spacing, and coating).

Upcoming Presentation

August 9 - 15

The Effect of Hydraulic Cements on the Flexural Behavior of Wool Reinforced Mortars
by Alessandro Fantilli, Polytechnic University of Turin

Presentation details

Concrete with Recycled Materials (ACI Fall 2020 Convention, Virtual Sessions) It is known that natural wool is a good thermal insulating material, but recent results suggest another application: the use of wool as a fiber-reinforcement in mortars and concretes. Indeed, the mechanical properties of wool filaments are comparable to those of some synthetic polymeric fibers (e.g., made with polypropylene). However, wool can dissolve in alkaline environments and, therefore, the performances of reinforced cement-based matrixes cannot be guaranteed for a long time. Accordingly, four series of reinforced mortar beams have been made with low and high alkali, sulfo-aluminate, and ordinary Portland cement. To investigate the chemical compatibility, and the subsequent effects on the mechanical performances, the beams have been tested in three-point bending. As a result, the lower the alkalinity of the cement paste, the better the post-cracking capability, of both polypropylene and wool fibers, to arrest the growth of cracks.

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