DATE: May 4, 2021
TIME: 1:00 pm to 2:00 pm EDT
Continuing Education Credit: 0.1 CEU (1.0 PDH)
Approved AIA and ICC
Access Period: 30 days
CEU (PDH) REQUIREMENTS:
To earn CEU (PDH) credit, individuals must purchase the webinar and attend the live webinar for the entire duration (or pass the quiz available after the webinar).
Detailed Webinar Instructions
Specifications for mass concrete require explicit planning and control of thermal stresses. Historically, overdesign of high-performance concrete for compressive strength through usage of excessively high portland cement contents has caused varying degrees of early age cracking due to both thermal and autogenous shrinkage stresses. Development of low-heat-performance concrete (LHPC) to minimize cracking and improve service life is a new approach that addresses concerns for cracking and service life through optimization. A properly designed LHPC can ease thermal control requirements and save time in the schedule, as well as provide a higher level of durability to owners. Design of LHPC requires minimization of cementitious materials content, optimization of supplementary cementing materials (SCMs), uniform gradation of aggregates, and selection of advanced admixture technology. A performance engineering approach incorporates durability in addition to early strength and constructability requirements to meet contractor needs. Performance requirements can include restrained shrinkage cracking resistance, linear free shrinkage limits, freeze-thaw resistance, alkali-silica reactivity, and chloride penetration resistance. Field performance to date has indicated that LHPC will provide owners with an increase in service life while meeting mass concrete specification requirements.
Table of Contents
1. Identify modifications to concrete mixtures to achieve low-heat-performance concrete.
2. Explain how performance requirements for a low-heat-performance concrete are determined.
3. Describe the performance engineering approach to achieve durable concrete mixtures.
4. Discuss how low-heat-performance concrete enhances constructability.
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).