Preliminary Investigation Caltrans Division of Research and Innovation Produced by CTC & Associates LLC Concrete Recycling: Reuse of Returned Plastic Concrete and Crushed Concrete as Aggregate Requested by Rock Products Committee: Materials and QA Sub Task Group of the Concrete Products Task Group September 7, 2012 (revised) The Caltrans Division of Research and Innovation (DRI) receives and evaluates numerous research problem statements for funding every year. DRI conducts Preliminary Investigations on these problem statements to better scope and prioritize the proposed research in light of existing credible work on the topics nationally and internationally. Online and print sources for Preliminary Investigations include the National Cooperative Highway Research Program (NCHRP) and other Transportation Research Board (TRB) programs, the American Association of State Highway and Transportation Officials (AASHTO), the research and practices of other transportation agencies, and related academic and industry research. The views and conclusions in cited works, while generally peer reviewed or published by authoritative sources, may not be accepted without qualification by all experts in the field. Table of Contents Executive Summary ...................................................................................................................................... 2 Background ............................................................................................................................................... 2 Summary of Findings: Part 1. Returned Plastic Concrete......................................................................... 2 Survey .................................................................................................................................................... 3 Interviews and Issues ............................................................................................................................. 3 Resources ............................................................................................................................................... 3 Summary of Findings: Part 2. Crushed Concrete as Aggregate................................................................ 3 Survey .................................................................................................................................................... 3 Interviews .............................................................................................................................................. 4 Resources ............................................................................................................................................... 4 Gaps in Findings........................................................................................................................................ 4 Next Steps ................................................................................................................................................. 5 Contacts ........................................................................................................................................................ 6 California................................................................................................................................................... 6 State DOTs ................................................................................................................................................ 6 National Organizations and Research Institutions .................................................................................... 6 Part 1. Returned Plastic Concrete – Survey .................................................................................................. 8 Audience.................................................................................................................................................... 8 Survey Text and Questions........................................................................................................................ 8 Survey Responses .................................................................................................................................... 10 Follow-up Industry Survey...................................................................................................................... 11 Part 1. Returned Plastic Concrete – Interviews and Issues ......................................................................... 12 California Stakeholders ........................................................................................................................... 12 National Experts ...................................................................................................................................... 15 Part 1. Returned Plastic Concrete – Resources ........................................................................................... 18 Related Specifications and Standards...................................................................................................... 18 Research .................................................................................................................................................. 19
Concrete Recycling: Reuse of Returned Plastic Concrete and Crushed Concrete as Aggregate
Apr 25, 2023
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