The Mechanical Property Deterioration Model for Concrete in the Environment with Salt Solution

• 1、Research Center of Geotechnical and Structural Engineering

Abstract：Based on the dry-wet cycling experiment of concrete and micro-mechanical，this paper is about the study on the mechanical properties of concrete in seawater erosion . In the aspect of dry-wet cycling ，by accelerated corrosion test method, the experiment of concrete specimens and mortar specimens which were made according to the ratio of concrete, were completed after 0、10、20、30、40 and 50 times dry-wet cycles. Under the influence of seawater erosion on the concrete, its compressive strength was tested, together with the tensile strength of concrete, elastic modulus and stress-strain relationship, using the large static-dynamic triaxial test system for concrete. According to the theory of micro-mechanics， the concrete test block was numerically simulated on meso-level. Considering of various components, the material nature of its components was assigned in accordance with the Weibull distribution. In order to reflect the influence of seawater erosion to the concrete, the strength and elastic ratio of mortar specimens were assigned according to the result of dry-wet cycling experiment. Finally, through the analysis and study of the concrete above all, the compressive strength reduction model：F=53.789e-0.0117N，the tensile strength reduction model：F=5.3794e-0.01N，and the elastic ratio reduction model：E=64.735e-0.0191N，were determined with the change in the number of dry-wet circle.

Keywords： concrete；corrosion；artificial seawater；mesoscopic numerical simulation；accelerated corrosion experiment；