Bekoe-trb-2010 - Transportation Research Board Presentation...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Topic: Concrete containing recycled concrete aggregate for use in concrete pavement Presented by: Patrick Amoah Bekoe Other Authors: Dr. Mang Tia and Michael J. Bergin 01/13/2010 Transportation Research Board Presentation Order of Presentation Background and research need Hypothesis of research Research objective Literature review Materials and test methods Test results and discussion Evaluation of potential performance of concrete containing RCA in pavement Conclusions and recommendations
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background and Research Need Concrete with lower modulus of elasticity would have a lower stress due to the same applied load and thus could have a lower chance of cracking Recycled concrete aggregate (RCA) is currently been used as a base course in flexible pavement but its use in a new rigid pavement has not been fully exploited. With the increasing volume of waste or by-product materials from industry, domestic and mining sources, decreasing availability of landfill space for disposal, depletion of virgin aggregates and the increasing cost of asphalt pavement, recycling has become an obvious choice not only as a base material for flexible pavement but also for new rigid concrete pavements Thus, there is a need to assess the performance of recycled concrete used for concrete pavement Hypothesis of Research Incorporation of Recycled Concrete Aggregates (RCA) in concrete can reduce the modulus of elasticity of concrete mixture and can reduce the load induced stresses in concrete pavements RCA added to concrete mixtures reduces the flexural strength only slightly Addition of RCA to concrete can reduce the stress-strength ratio and thus improve the performance of concrete pavement at critical temperature and load condition.
Background image of page 2
Research Objectives To evaluate the potential use of RCA in concrete and its effects on the mechanical and thermal properties of concrete. To assess the performance of concrete containing different amounts of RCA when used in a typical concrete pavement in Florida. Research Approach Perform a literature review on past and present studies on the use of RCA in concrete. Prepare concrete mixtures containing natural aggregates and RCA material with varying proportions. Evaluate the properties of concrete containing different amounts of RCA in the laboratory. Perform stress analyses on hypothetical concrete pavements under critical load and temperature conditions in Florida, if these pavements were made with these concretes containing different amounts of RCA. Evaluate the potential performance of these hypothetical pavements based on the ratio of computed maximum stress to the flexural strength of the concrete
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Literature Review The first modern recorded use of concrete recycling occurred in the U.S in 1942 (performed by PCA and was used in the rehabilitation of a failed road in Kansas) Since year 2000, there has been a renewed interest in recycling spurred
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

Bekoe-trb-2010 - Transportation Research Board Presentation...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online