On-Demand Course: Workability Retention and Extension: Keeping Your Concrete Alive

Price: $ 59.00 USD

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The contents of this course include five recorded presentations from the ACI 2021 Fall Virtual Convention.

• Extended Workability for Concrete: Goals and Challenges, by Pawan Gupta, Jose Pacheco, CTLGroup

• In-Transit Management of Slump, by Nathan Tregger, GCP Applied Technologies

• Admixtures for Use in Extended Workability Applications, by G Terry Harris, GCP Applied Technologies

• Improving the Lubrication, Stamina and Endurance of Concrete for Extended Workability Applications, by Oscar Antommattei, Kiewit Engineering Group Inc.

• Impact of High-Range Water Reducer, Workability Retaining Admixture and Antifoaming Admixture on Fresh Properties of UHPC, by Jiong Hu, University of Nebraska-Lincoln

INSTRUCTIONS: Study the materials included in this module. Then, complete and pass the corresponding 10-question quiz with a score of 80% or higher to receive a certificate for 0.15 CEU (equivalent to 1.5 PDH).

Continuing Education Credit: 0.15 CEU (1.5 PDH)

Approved by AIA and ICC

Access Period: 30 days


Many construction projects demand concrete mixtures with extended workability, and it is expected that this issue will become of even higher importance with the potential upcoming changes in ASTM C94 that will lift the 90-minute discharge limit for ready-mixed concrete. Attendees will understand the theoretical background and mechanisms behind concrete workability loss, including advancements in chemical admixture technology, industry practices, strategies, and tools available for design and control of concrete workability. Case studies of successful projects incorporating concretes with extended workability will also be presented. The target audience includes concrete contractors, ready-mixed producers, designers, chemical admixture producers, and the research community.


Document Details

Author: Pacheco, Tregger, Harris, Antommattei, JiongHu

Publication Year: 2022


Categories: Admixtures, Construction Practices, Design

Formats: Online Learning

Table of Contents

Learning Objectives

1. Identify key mechanisms and processes governing concrete workability loss.

2. Describe various strategies and approaches for the design of concrete mixture with extended workability times.

3. Explain tools, test methods, and technologies available to the industry for workability retention extension control.

4. Recognize limitations and potential problems associated with concrete workability extension.


Any applicable errata are included with individual documents at the time of purchase. Errata are not included for collections or sets of documents such as the ACI Collection. For a listing of and access to all product errata, visit the Errata page.

Return/Exchange Policy

Printed / Hard Copy Products: The full and complete returned product will be accepted if returned within 60 days of receipt and in salable condition. A 20% service charge applies. Return shipping fees are the customer’s responsibility.

Electronic /Downloaded Products & Online Learning Courses: These items are not eligible for return.

Subscriptions These items are not eligible for return.

Exchanges: Contact ACI’s Customer Services Department for options (+1.248.848.3800 – ACICustomerService@concrete.org).

Quantity Discounts

This item qualifies for quantity discounts. Discounts are reflected in the shopping cart.
Quantity Discount
10 - 19 25%
20 - 49 35%
50+ copies 50%