Recycled concrete aggregate : field implementation at the Stan Musial Veterans Memorial Bridge.
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Recycled concrete aggregate : field implementation at the Stan Musial Veterans Memorial Bridge.

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      The main objective of this research is to evaluate the feasibility of using RCA for concrete production in rigid pavement applications. The experimental program was undertaken to investigate the performance of different concrete made with different amounts of RCA, water-to-cementitious materials ratios (w/cm), and Class C fly ash contents to develop sustainable concrete designated for rigid pavement. The scope of work was implemented to achieve the objective of the research study is presented below: Task #1: The purpose of this task is to conduct a literature review of past experience and previous research on RCA. RCA properties as well as the behavior of concrete containing RCA, including the fresh and hardened properties (e.g., workability, compressive strength, flexural strength, shrinkage), and durability (e.g., freeze-thaw resistance, permeability, scaling). Specifically, the literature review focuses on studies that investigated performance of rigid pavement made with partial or full replacement of RCA. Task #2: The purpose of this task is to optimize concrete mixtures incorporating various levels of RCA. Various amounts of coarse and fine RCA were used as replacements of virgin aggregate. Alternative mixing procedures are used to develop concrete with RCA. Task #3: The performance of the optimized concrete mixtures is evaluated in terms of: fresh properties: slump, air content, and bleeding; mechanical properties: compressive strength, splitting tensile strength, flexural strength, modulus of elasticity, and shrinkage; as well as durability: permeable void volume, absorption, surface electrical resistivity, bulk electrical resistivity, freeze/thaw durability, and de-icing salt scaling. Task #4: The proven RCA-made concrete mixtures are then employed into the construction of pavement sections of the approach towards the Stan Musial Veterans Memorial Bridge in St. Louis, Missouri. Fresh properties of the concrete mixtures are investigated at the job site. In addition, samples are taken to further evaluation of mechanical properties and durability of the employed mixtures. Field instrumentation is carried out to monitor the long-term deformation characteristics of the pavement sections. Detailed information about the field implementation is presented in Chapter 5 of this report. Pavement structure is described in detail in Chapter 6. Task #5: Truck load testing is carried out to evaluate the in-situ performance of the pavement sections. Various loading scenarios are considered to monitor the deformation characteristics of the instrumented sections under controlled traffic loading
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