April 25, 2024

EP #085: Dr. Concrete Answers Hokie Queries

44 minutes

In this episode of the Concrete Logic Podcast, Seth and Dr. Belkowitz answer questions from students at Virginia Tech about concrete mix design. They discuss the role of aggregate size in a mix design, its impact on the cost and control of the concrete, and the importance of a well-graded gradation.

They also touch on the use of recycled concrete aggregate and its potential effects on the hydration process. The conversation highlights the economic and technical considerations involved in selecting the right

aggregate for a concrete mix.

Additionally, Dr. Jon and Seth discuss the impact of fines in aggregate on shrinkage, the seasonality of concrete work, and the decision-making process for choosing cement types in construction projects. They also share their favorite concrete mix designs.

Takeaways

Aggregate size in a concrete mix design affects

the cost and control of the concrete.

A well-graded gradation of rock and sand helps

reduce the porosity index and the amount of paste needed in the mix.

Recycled concrete aggregate can have

contaminants that affect the hydration process and may require rock washing.

Aggregate size can also impact shrinkage of

concrete.

Considerations for selecting the right aggregate

include economic factors, availability, and technical specifications.

The fines in aggregate, such as the fine particles that pass through a sieve, can have an impact on shrinkage and other properties of concrete.

Concrete work is not necessarily seasonal, as

there are techniques and materials available to pour concrete in various weather conditions.

The choice of cement type in construction projects is typically made by the engineer, architect, or project manager based on project requirements and local industry practices.

Favorite concrete mix designs and job site

stories can vary among professionals in the industry, showcasing the diverse and exciting nature of working with concrete.

Chapters

00:00 Introduction and T-Shirt Discussion

10:00 The Role of Aggregate Size in Concrete Mix Design

16:11 The Impact of Recycled Concrete Aggregate on Mix

Design

43:14 Favorite Concrete Mix Designs and Job Site Stories

***

Did you learn something from this episode? If so, please

consider donating to the show to help us continue to provide high-quality content for the concrete industry.

Donate here: https://www.concretelogicpodcast.com/support/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

***

Episode References

Guest: Dr. Jon Belkowitz | Intelligent Concrete | [email protected]

Guest Website:⁠ https://www.intelligent-concrete.com/

Guest: Virginia Tech Myers-Lawson School of Construction

Guest Website: https://mlsoc.vt.edu/

Producers: Jodi Tandett

Associate Producer: Gregory Rice

Donate & Become a Producer: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.concretelogicpodcast.com/support/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Music: Mike Dunton | ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.mikeduntonmusic.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ | ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠[email protected]⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ | Instagram ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠@Mike_Dunton⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Host: Seth Tandett, ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠[email protected]⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Host LinkedIn: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.linkedin.com/in/seth-tandett/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Website: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.concretelogicpodcast.com/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

LinkedIn: ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://www.linkedin.com/company/concrete-logic-podcast

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By Seth Tandett

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