TITLE:
Chloride Resistance of Concrete under Complex Stress and Environment
AUTHORS:
Mohammed Saed Yusuf, Xue Wen
KEYWORDS:
Concrete Durability, Chlorideion, Penetration, Wet Dry Cycle’s Zone, Submerges Zone, Compressive Stress, Tensile Stress, Life Prediction, Micro-Structure
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.13 No.1,
March
30,
2023
ABSTRACT: The presence of stress is
shown to have a significant impact on chloride ions in concrete. Reinforced concrete
is usually durable and cost-effective which has
resulted in its widespread use for construction, however, the concrete subjected
to environment and load has become increasingly apparently that attacked by aggressive
agents such as chloride ion. In this study, the coupling influences are stress effects and environmental problems
on the coastline concrete durability have been investigated. A series of
cyclic of a wet-dry cycle and submersion tests were performed onto the stressed
concrete to obtain an understanding of the physical mechanisms causing the accumulation
of chlorides in the interior pores of concrete under different stress types and
exposure environments, based on the same duration. Specimens were prepared and subjected to NaCl solution
in a wet-dry cycle and submersion, the chloride in the tension zone is gradual with
increasing the stress level, as well as the chloride ion in the wet-dry cycle, is
increasing the number of cycles. The apparent diffusion coefficient of each specimen
was calculated respectively, the profile of concentration at a different section of tension
and compression zones were presented in influence factors of the number of cycles,
the length of drying phase, and periodic wetting cycles with sodium solution was
discussed. After employed Fick’s second law, the results suggested Da in a wet-dry cycle is much
higher than the Da in submersion zones.