Notes/Preview

INSTRUCTIONS: View the recorded webinar. Complete 10-question quiz with a score of 80% or higher to receive a certificate for 0.10 CEU (equivalent to 1.0 PDH).

Continuing Education Credit: 0.10 CEU (1.0 PDH)

Approved AIA and ICC

Access Period: 30 days

Description

This is a recorded webinar from May 4, 2021.

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.

Document Details

Author: Matthew D’Ambrosia

ISBN:

Categories: Concrete Technology, High Performance Concrete, Mass Concrete, Mixture Proportioning

Formats: Online Learning

Table of Contents

Learning Objectives:

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.

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