Fracture Properties of Ultra-High Strength Cement-Based Materials

Abstract:

By combining the three-point bending beam test with theoretical derivation, the elastic modulus, fracture toughness, surface energy and the maximum defect size permissible under certain working stress of ultra-high strength cement-based materials were obtained. The fracture properties were studied with the water to binder ratios (W/B) from 0.18 to 0.14. Test results showed that the ultra-high strength cement-based materials are quasi-brittle and the net bending strength of specimen decreased substantially when there was a notch. The elastic modulus of ultra-high strength cement-based materials can be up to 74.0 GPa, obviously higher than that of ordinary cement-based materials, showing greater elastic deformation resistance. Moreover, with decrease of W/B ratio, the compressive strength, fracture toughness, critical strain energy release rate as well as the maximum defect size permissible under certain working stress of ultra-high strength cement-based materials increased significantly, indicating that the anti-cracking ability increased with the decrease of W/B ratio.

• Periodical: Key Engineering Materials (Volume 726)
• Pages: 553-557
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.726.553
• Online since: January 2017
• Authors: Qing Bi, Wu Yao*
• Keywords: Cement-Based Materials, Fracture Property, Ultra-High Strength

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