Sessions & Events

Sessions and Events Schedule is coming soon. All sessions and events take place in Eastern Standard Time (EST UTC-5). Please note, Daylight Savings Time ends on November 3, 2024.
All events take place at the Philadelphia Marriott Downtown.

On-demand sessions will be available for viewing in the convention platform/event app under "On-Demand Content" within 24-48 hours of the session premiere. Please note, on-demand sessions are not available for CEU credit. *Denotes on-demand content.

MINI SESSION: Overdesign of Concrete Mixtures

Monday, November 4, 2024 9:00 AM - 10:00 AM, Grand BR Salon G

Recently, there have been a lot of discussions about concrete mixtures being overdesigned for compressive strength. These strengths greatly exceed the ACI Specifications for Structural Concrete 301-21 required average strengths resulting in an increased carbon footprint due to much higher cementitious materials use and added cost to construction. The mixtures also have higher paste contents and other performance problems associated such as cracking, higher in-place concrete temperatures, shrinkage, creep, and alkali-silica reaction. In this paper, we discuss some of the reasons why concrete mixtures are overdesigned and offer some ideas of how the overdesign can be reduced.

Learning Objectives:
(1) Explain history and potential reasons for overdesign concrete mixtures;
(2) Learn methodologies to reduce overdesign of concrete mixtures;
(3) Discuss negative impacts of overdesign of concrete mixtures;
(4) Describe potential performance issues associated with overdesigning concrete mixtures.

Overdesign of Concrete Mixtures

Presented By: Karthik Obla
Affiliation: NRMCA
Description: Recently, there have been a lot of discussions about concrete mixtures being overdesigned for compressive strength. These strengths greatly exceed the ACI Specifications for Structural Concrete 301-21 required average strengths resulting in an increased carbon footprint due to much higher cementitious materials use and added cost to construction. The mixtures also have higher paste contents and other performance problems associated such as cracking, higher in-place concrete temperatures, shrinkage, creep, and alkali-silica reaction. In this paper, we discuss some of the reasons why concrete mixtures are overdesigned and offer some ideas of how the overdesign can be reduced.

Upper Level Sponsors

Sessions & Events

Upper Level Sponsors

Security