Performance Criteria for Ready Mixed Concrete: Where Are We Today? (Part 1)-Performance Requirements for Ready Mixed Concrete in North America

Performance Requirements for Ready Mixed Concrete in North America—Are We There Yet (PDF)

Pdf Summary

The presentation, conducted at the 2015 Kiewit Bridge & Marine District Meeting and part of the ACI Fall 2018 Performance Concrete event, focused on the progress and challenges of implementing performance requirements for ready mixed concrete across various construction projects in North America. <br /><br />Oscar R. Antommattei, the Concrete Engineering Manager, discussed the intricacies of performance-based approaches as opposed to prescriptive ones in ensuring long-lasting concrete structures, aiming for a lifespan of at least 100 years. The discussion emphasized that achieving optimal performance is not just about meeting strength and slump requirements but also ensuring the concrete's durability, workability, and economic viability. This involves focus areas such as consistent workability, enhanced rheology, improved corrosion resistance, visual appearance, mix optimization, and overall quality control.<br /><br />The presentation highlighted different project needs and how specifications vary to meet those needs, considering perspectives from architects, contractors, owners, and producers. It addressed the minimum requirements for coarse aggregates, minimum cementitious content, and appropriate admixtures to achieve desired performance outcomes like strength and durability.<br /><br />Case studies on high early strength mixes and tremie concrete were used to illustrate the application of performance strategies. These case studies outlined adjustments made, such as specification changes for aggregate size and composition to ensure optimal performance. Emphasis was placed on thorough testing for fresh properties, workability loss, and segregation.<br /><br />Finally, the closing remarks underscored the importance of innovation, early involvement, adjusting to construction demands, and choosing economical solutions that fulfill requirements while exceeding expectations. The presentation concluded with a message of gratitude and an encouragement to pursue a performance-focused mindset.

Keywords

Performance Concrete

Ready Mixed Concrete

Concrete Durability

Concrete Workability

Concrete Engineering

Mix Optimization

Corrosion Resistance

Quality Control

Construction Projects

Case Studies