Experimental and computational characterization of glass microsphere-cementitious composites
نویسندگان
چکیده
Mechanical characterization of Portland cement with hollow glass microspheres two different crushing strengths, 500 (FM) and 10,000 psi (3 M), was carried out to determine both quasi-static dynamic responses the cementitious composites. In tests, time resolved high speed camera photos deforming specimens revealed stress levels at which incipient damage occurred. The split-Hopkinson pressure bar experiments elucidated that statistically there is no difference in specific energy absorption when comparing aggregates FM 5%, 3 M 10% cements using Anderson-Darling criterion. To validate these findings, were employed inform a three-dimensional empirically-based homogenous continuum evolution concrete model (called RHT model) LS-DYNA. Simulations predicted addition inclusions delay onset effective plastic strain, however between failure suggested be lower than cement. Due varying compressive strengths microspheres, experimental results found ideal volume fractions for manufacturers 5% (10,000 microspheres) 15% (500 achieve highest strength greatest absorbed their respective microsphere specimen group. authors believe predictions are due relative gain compaction decrease porosity—signified by plateauing strain not seen any other fraction each manufacturer. Computational simulations this composite material agreed findings showing ‘Type II’ III’ mechanisms, discussed section, dominate catastrophic crack growth occurs.
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ژورنال
عنوان ژورنال: Cement and Concrete Research
سال: 2022
ISSN: ['0008-8846', '1873-3948']
DOI: https://doi.org/10.1016/j.cemconres.2021.106671