FINITE ELEMENT SIMULATION ON THE MECHANICAL BEHAVIOUR OF FOUNDATION CONCRETE EXPOSED TO A PROLONGED HUMID ENVIRONMENT
Isotropic modeling in LISA 8.0 Finite Element Software was used to investigate the mechanical behaviour of foundation concrete exposed to a prolonged humid environment. Laboratory experimentation was done to determine the preprocess parameters for the numerical simulation. A total of 24 specimens with nominal dimensions of 300mm × 150mm × 100mm were moulded using a constant water-cement ratio of 0.65 and dosages of 150Kg/m3, 200Kg/m3, 250Kg/m3, 300Kg/m3, 350Kg/m3, 400Kg/m3 and then buried in a marshy area for 56 days, 84 days, 112 days, and 196 days. Concrete dosed at 150Kg/m3 had compressive strengths of 10.5MPa, 9.6MPa, 8.4MPa, and 7.8MPa for 56 days, 84 days, 112 days, and 196 days, respectively. Compressive strengths of 15MPa, 14.5MPa, 12.8MPa, and 9.2MPa were observed for 56 days, 84 days, 112 days, and 196 days, respectively for concrete dosed at 200Kg/m3. For the duration of 56 days, 84 days, 112 days, and 196 days, the concrete witnessed compressive strengths of 17.2MPa, 15.8MPa, 14.1MPa, and 10.5MPa, respectively for concrete dosed at 250Kg/m3. For concrete dosed at 300Kg/m3, the compressive strengths were 17.6MPa, 16.2MPa, 14.2MPa, and 10.9MPa for 56 days, 84 days, 112 days, and 196 days, respectively. Compressive strengths of 20.1MPa, 18.5MPa, 16.2MPa, and 12.5MPa were noticed for 56 days, 84 days, 112 days, and 196 days, respectively for concrete dosed at 350Kg/m3. For concrete dosed at 400Kg/m3, compressive strengths of 20.8MPa, 19MPa, 16.5MPa, and 12.7MPa were culled for 56 days, 84 days, 112 days, and 196 days, respectively. The modulus of elasticity for the concrete dosed at 400kg/m3 was the greatest and was 29741.38MPa; the Poisson ratio was 0.177; and the average density of specimens was 2374.017kg/m3. The mean force applied on the modeled specimen in LISA 8.0 was 638 700N. Some post-process outputs obtained were the von Mises stress, principal stresses, and displacement magnitude. There was a general trend of the values of finite element simulation being above those of laboratory experimentation, which necessitated the use of some correction factors.
compressive strength, von Mises stress, modulus of elasticity, principal stresses, humid, strains, displacement magnitude.
Received: December 18, 2020; Accepted: January 28, 2021; Published: March 4, 2021
How to cite this article: Nsahlai Leonard Nyuykongi, Yamb Bell Emmanuel and Ndigui Bilong, Finite Element Simulation on the Mechanical Behaviour of Foundation Concrete Exposed to a Prolonged Humid Environment, International Journal of Materials Engineering and Technology 20(1) (2021), 29-56. DOI: 10.17654/MT020010029
This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License
References:
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