含粉煤灰陶粒高延性水泥基复合材料研发与有限元模拟

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中图分类号：TU528.58 文献标志码：A DOI： 10.15935/j.cnki.jggcs.20241120.001

AbstractThis study investigates the influence offlyash cold-bonded aggregate（FCA） particle size on the mechanical properties of coarse aggregate-engineered cementitious composites（CA-ECC）.Uniaxial compression and tensile tests demonstrate that CA-ECC maintains high tensile strain capacity.Specifically， CA8-ECC with FCA particle sizes of5 to 8mm achieves a tensile deformation of 11% .Mesoscopic and microscopic analyses reveal that cracks undergo deflection and bifurcation at aggregate interfaces，forming denser crack paterns than conventional ECC. A mesoscopic numerical model based on random aggregate distribution was established to simulate crack propagation，and its reliability was validatedby experimental data.Finite element analysis indicates that smal-size aggregates distributed in the matrix promote damage extension，enabling sufficient development of matrix microcracks.Furthermore，stress distributionanalysis under loading confirms that optimal interfacial properties，appropriate aggregate elastic modulus，and controlled particle size are prerequisites for ensuring the high deformation capacity of CA-ECC.

Keywordscoarse aggregate，engineered cementitious composites （ECC），strain-hardening，random aggregate model， finite element analysis

0 引言

高延性纤维增强水泥基复合材料（Engineered Cementitious Composites，ECC）是一种特殊的短切纤维增强复合材料。（剩余14711字）