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

This Week's Featured Presentation

Can We Recycle Recycled Coarse Aggregates (RCA)? How Many Times?
by Dr. M. Shahria Alam, P. Engineering, The University of British Columbia

Session details

Concrete with Recycled Materials (ACI Fall 2015 Convention, Denver, CO)
Concrete is one of the most widely used construction materials in the world. However, the production of portland cement, an essential constituent of concrete, leads to the release of significant amount of carbon dioxide, a greenhouse gas. It also leads to depletion of aggregate and water resources. Environmental issues are playing an important role in the sustainable development of the cement and concrete industry. A sustainable concrete structure or infrastructure is concrete which is constructed which minimizes the environmental impact through its life cycle, Concrete is considered sustainable material. It has low inherent energy requirements, it’s produced to order with little waste, it’s made from plentiful resources and can be made with recycled materials and recycled crushed aggregates, and it is recyclable itself. Many recycled materials that can be used in concrete, starting from recycled water and recycled aggregates and recycled by-product materials can be implemented in many different concrete structure applications.

Upcoming Presentations

January 21 – 27

Recycled Concrete Aggregates for Improved Sustainability of Reinforced Concrete Structures
by Robert D. Devine, Civil & Environmental Engineering & Earth Sciences, University of Notre Dame

Session details

Concrete with Recycled Materials (ACI Fall 2015 Convention, Denver, CO)
Concrete is one of the most widely used construction materials in the world. However, the production of portland cement, an essential constituent of concrete, leads to the release of significant amount of carbon dioxide, a greenhouse gas. It also leads to depletion of aggregate and water resources. Environmental issues are playing an important role in the sustainable development of the cement and concrete industry. A sustainable concrete structure or infrastructure is concrete which is constructed which minimizes the environmental impact through its life cycle, Concrete is considered sustainable material. It has low inherent energy requirements, it’s produced to order with little waste, it’s made from plentiful resources and can be made with recycled materials and recycled crushed aggregates, and it is recyclable itself. Many recycled materials that can be used in concrete, starting from recycled water and recycled aggregates and recycled by-product materials can be implemented in many different concrete structure applications.

January 28 – February 3

Performance Based Tests and Criteria for Concrete Durability
by Colin L. Lobo, NRMCA; and Karthik H. Obla, NRMCA

Session details

Sulfate Attack on Concrete (ACI Fall 2016 Convention, Philadelphia, PA)
This session explores deterioration of concrete due to sulfate attack, a complex process characterized by multiple manifestations including volume expansion, cracking, spalling, softening of the cementitious matrix creating mushy concrete. Sulfate attack can be classified as internal or external to the cementitious matrix. The underlying damage of sulfate attack can be chemical or physical deterioration. The session scope involves theoretical and experimental aspects of different forms of sulfate attack as well as case studies. This session is an effort to compile current developments in research and standards, and educate practitioners and researchers about this concrete durability issue and its underlying mechanisms. And the effects of supplementary cementitious materials on mitigating external sulfate attack on concrete exposed to sulfates.

February 4 – 10

Concrete Removal in Repairs Involving Corroded Reinforcing Steel (364.6T-02(11)) Use of Hydrodemolition for Removal in Unbonded Post Tensioned Systems (354.8T-02(11))
by Racheal D. Lute, University of Texas

Session details

Repair and Rehabilitation Tech Notes (ACI Fall 2016 Convention, Philadelphia, PA)
The Tech Notes produced by ACI Committee 364, Rehabilitation, cover important aspects of a concrete rehabilitation program, ranging from the initial stages of evaluation to strengthening and to conducting repairs so as to ensure a long service life.

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