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Realizing the strengths of SCM concretes by recognizing its weaknesses R. Doug Hooton

Author(s): R. Doug Hooton
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on Concrete with Supplementary Cementitious Materials
Editor(s): Ole M. Jensen, Konstantin Kovler and Nele De Belie
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 126-135
Total Pages: 10
Language : English

Abstract: Abstract
Concretes made with supplementary cementitious materials can improve the physical properties and durability of concretes in many ways, but if differences in SCM concretes are not recognized by designers, concrete suppliers and contractors, then the potential improvements may not be realized and construction problems may occur. The concerns with potential for problems may grow as owners and designers specify “green concrete” to meet sustainability ratings. Preventing problems and obtaining better concrete with SCMs is not difficult but there needs to be recognition of the potential for impacts on required curing periods and construction schedules, especially in extreme climates. For example, cold temperatures typically have bigger impacts on reducing rates of reaction and development of early-age properties of SCM concretes than with portland cement concrete. However, due to the sensitivity of SCM hydration to temperature, the opposite is often true in hot climates,where expected reductions in temperature rise of mass concrete may not occur unless very high levels of SCMs are used. There is also a need for longer-term retention of capillary pore water with SCMs to allow for the different rates of reaction. After reviewing both the positive and potential negative impacts of various SCM concretes on durability and engineering properties, methods of design to maximize the ositives are discussed.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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