@article{PENG2026, 
author = {Sheng PENG and Cheng-zhe ZHANG and Xian-qi XIE and Li HE and Lu-jun CAI},
title = {Dynamic Response and Numerical Simulation of UHTCC-R-RAC Composite Slab under Contact Explosion},
year = {2026},
journal = {BLASTING},
volume = {43},
number = {1},
pages = {1-10},
keywords = {ultra-high toughness cementitious composites-reinforced recycled aggregate concrete, laminated slab, blast resistance, refinement, numerical simulation},
url = {https://www.sciopen.com/article/10.3963/j.issn.1001-487X.2026.01.001},
doi = {10.3963/j.issn.1001-487X.2026.01.001},
abstract = {To investigate the blast resistance of Ultra-High Toughness Cementitious Composites-Reinforced Recycled Aggregate Concrete (UHTCC-R-RAC) composite slabs under contact explosion, three sets of UHTCC-R-RAC specimens with varying UHTCC layer thicknesses (0 mm and 10 mm) and recycled coarse aggregate substitution rates (25% and 75%) were designed and subjected to contact explosion tests using 200 g emulsion contact-explosions under different working conditions. Subsequently, a numerical model was developed using the Arbitrary Lagrangian-Eulerian (ALE) method and a fluid-structure coupling algorithm in ANSYS/LS-DYNA, incorporating both a global (10 mm) and a locally refined (5 mm) mesh configuration for the UHTCC-R-RAC composite panels. The experimental results indicate that increasing the replacement rate of recycled coarse aggregate from 25% to 75% reduces peak strain by 11.7% and peak acceleration by 6.4% on the blast-exposed surface of the R-RAC composite slab, demonstrating a negative correlation between RCA content and blast resistance. Conversely, the application of a10 mm UHTCC layer significantly improved blast resistance, evidenced by a 64. 7% increase in peak strain. Numerical simulations further confirmed that the locally refined 5 mm mesh model outperformed the global 10 mm mesh model in both computational accuracy and efficiency.}
}