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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Variable Density Precast Concrete Panel Development
Appears on pages(s):
Abstract:The development of a variable density precast concrete panel system is described that significantly improves the thermal efficiency of concrete buildings by both improved insulation and increased thermal mass. Concrete from a single mix is stratified (defined as controlled segregation under vibration) to produce a lightweight, top layer and a dense, bottom layer. When erected, the panels have the lightweight layer on the outside providing insulation while the inner layer provides structural strength and improves thermal mass. Concrete mixes were stratified using different density aggregates, ensuring the rheology was in the correct range and using moderate levels of vibration. Waste materials such as fly ash, slag and expanded glass were used together with either Portland cement or inorganic polymer cements. Results from laboratory trials are presented showing the rheological, structural, serviceability, and thermal performance of the system. Initial findings suggest that there is significant potential in using variable density concrete in buildings to improve thermal efficiency and comfort. Further testing is currently been undertaken to measure the structural performance, serviceability and durability of variable density concrete.
Concrete Institute of Australia, International Partner Access.
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