High-strain rate compressive behavior of concrete with two different substituted recycled plastic aggregates: Experimental characterization and probabilistic modeling. (3rd March 2023)

• Record Type: Journal Article
• Authors: Xiong, Beibei; Falliano, Devid; Restuccia, Luciana; Di Trapani, Fabio; Demartino, Cristoforo; Marano, Giuseppe Carlo
• Is Part Of: Construction & building materials. Volume 368(2023)
• Publication Date: 2023-03-03
• Subjects: High-strain rate compressive behavior -- Recycled plastic -- Two substituted plastic aggregate -- Mechanical properties -- Micro-scale characterization -- SHPB; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.130279
• Languages: English
• ISSNs: 0950-0618

Abstract

Abstract: This paper presents a pilot study on the characterization of the high-strain rate compressive behavior of a novel concrete with two different substituted recycled plastic aggregates. A reference mix with an average compressive strength of about 55 MPa is considered. Recycled PolyEthylene Terephthalate (PET) powder and recycled mixed plastic (composed of PolyPropylene (PP) and PolyEthylene (PE)) granules were adopted to substitute fine and coarse aggregates. Two different substitution strategies are employed. In the first one, the PET powder is used to substitute the fine sand by volume. In the second one, the PET powder is used to substitute the fine sand while the recycled mixed plastic granules are used to substitute the coarse sand and fine coarse aggregates by volume (50% for PET powder and 50% for recycled mixed plastic granules). Four total replacement levels (5%, 10%, 20%, and 30%) by volume were considered. The fresh concrete properties (slump and density) and quasi-static compressive behavior, are investigated. The micro-scale characterization of the material using SEM scans provided a complete understanding of the observed macro-scale behavior. Tests were performed using conventional quasi-static loading with a compressive testing machine and high-strain rate tests with a Φ 80-mm Split-Hopkinson Pressure Bar (SHPB) for strain rates up to 200 s − 1 . The dynamic tests revealed the marked strain rate dependency, although specimens with large plastic volume substitution were more sensitive to the strain rate effect. A probabilistic data-driven model for the Dynamic Increase Factor ( D I F ) is also proposed based on the test data. Ultimately, this study indicates that the proposed material has a good high-strain rate compressive behavior and can be a promising material to be employed for protective techniques against impact and blast loads. Highlights: High-strain compressive behavior of concrete with two different substituted recycled plastic aggregates. Recycled PolyEthylene Terephthalate powder (PET). Recycled mixed plastic (PolyPropylene (PP) and PolyEthylene (PE)) granules. Micro-scale characterization and probabilistic data-driven model for dynamic increase factor. Image-based waveform discussion highlighting different features of signals and damage.