Optimization of matrix viscosity improves polypropylene fiber dispersion and properties of engineered cementitious composites
نویسندگان
چکیده
Engineered cementitious composites (ECC) is a durable material with high tensile ductility and strain-hardening characteristics. Although considered as cost-effective fiber for ECC, polypropylene (PP) reportedly difficult to disperse in mortar matrix due its aspect ratio hydrophobicity. In this study, the viscosity of low-carbon ECC based on limestone calcined clay cement was tailored variable improve PP dispersion under pre-determined mixing protocol. The effect composite fresh hardened properties investigated experimentally. Results suggested an optimal range (10.3–11.5 Pa‧s) favors strength strain capacity at 28 days. At state 0.1 % modifying admixture (VMA)-to-binder mass ratio, PP-ECC achieved 7.0 3.5 MPa ultimate strength. When falls outside desired range, both were diminished. By tailoring VMA dosage, can be adjusted dispersion, workability, mechanical properties. findings study provide technical reference practical design application PP-ECC.
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ژورنال
عنوان ژورنال: Construction and Building Materials
سال: 2022
ISSN: ['1879-0526', '0950-0618']
DOI: https://doi.org/10.1016/j.conbuildmat.2022.128459