Characterization of the Tenacity of the Concrete Mortars Exposed to Elevated Temperatures| Science Publications

American Journal of Applied Sciences

E. Ouedraogo¹  S. Djaknoun¹  A. A. Benyahia¹ 

关键词: High performance concrete;    toughness;    temperature;   

DOI  :  10.3844/ajassp.2009.296.308

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

High Strength concrete Mortars with very fine sand exhibits a typical quasi-brittle behaviour. In the present work, a model based on linear elastic fracture mechanics is considered to investigate the material behaviour. Under the Mode I loading condition, an experimental investigation was conducted to evaluate the residual tenacity of the concrete mortars exposed to temperatures up to 900°C. We explored the compliance approach for KI evaluation through a three point bending test with specimens notched of different lengths and heated at different temperature. So, two methods, based on the fracture critical load, were applied to calculate the tenacity: an analytical method by MCM and a numerical approach by finite elements method using the Cosmos M2.0 software. The experimental results of the investigation complete the data available in the literature. The numerical modelling has then been validated, discussed and compared with analytical solution. It was then used to analyse other aspects of the material behaviour during the test as reported in the research. We can then observe a good fit between the experimental results and the theory.

【 授权许可】

Unknown