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Research Reports |
| Title: | Using an Ultra-accelerated Test Method to Evaluate Aggregate and Cement Combinations to Use Recycled Concrete Aggregate in New Concrete Construction |
| Authors: | Jennifer Tanner and Md Tarik Hossain |
| University: | University of Wyoming |
| Publication Date: | Dec 2020 |
| Report #: | MPC-20-425 |
| Project #: | MPC-539 |
| TRID #: | 01766442 |
| Keywords: | accelerated tests, airport runways, alkali silica reactions, cement, concrete aggregates, concrete construction, durability, laboratory tests, recycled materials, test procedures |
| Type: | Research Report – MPC Publications |
The Rocky Mountain Region has experienced considerable difficulty because of alkali-silica reaction (ASR) in concrete construction. Wyoming Department of Transportation was successful in using recycled concrete aggregate (RCA) on Interstate I-80 with limited ASR damage. Reusing concrete from demolition work has potential to produce durable concrete. A major concern with using RCA as a sustainable building material is its ASR potential, in particular if ASR damaged concrete will be recycled. In addition, a full service record is not always available for RCA. Hence, effective use of RCA requires the ability to classify whether it is reactive in terms of ASR. This study presents experimental data that permits RCA to be used in applications beyond base fill for roads. Furthermore, repeatability and reproducibility of test method was evaluated for an autoclave test. Within-laboratory precision from replicate experiments was evaluated for RCA concrete prism tests (CPT) with independent casting by three operators on different days. Inter-laboratory precision was evaluated with the participating of five external laboratories. Consistency statistics were performed in this project to analyze and identify any outlier data points. Additionally, these statistics confirmed that using RCA in CPTs did not result in additional variation compared to natural aggregates.
Tanner, Jennifer, and Md Tarik Hossain. Using an Ultra-accelerated Test Method to Evaluate Aggregate and Cement Combinations to Use Recycled Concrete Aggregate in New Concrete Construction, MPC-20-425. North Dakota State University - Upper Great Plains Transportation Institute, Fargo: Mountain-Plains Consortium, 2020.
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