Concrete damage transmission evaluation method under sulfate erosion in splash zone

Abstract

The invention discloses a concrete damage transmission evaluation method under sulfate erosion in a splash zone, which comprises the following steps: establishing a sulfate ion transmission model, including convection and diffusion processes in the splash zone of a marine environment; sulfate ions and material components in concrete are subjected to a chemical reaction, ettringite and other products are generated, concrete expansion is caused, a structure is damaged, and a damage constitutive structure under sulfate erosion is established; and establishing a relationship between the stress andthe porosity in the concrete damage process, and establishing a relationship between the porosity and the ion diffusion coefficient so as to obtain the damaged ion diffusion coefficient. According tothe method, concrete damage transmission under sulfate erosion of the splash zone can be predicted more accurately, and a basis is provided for developing chemical-mechanical equivalent conversion under the environmental action and establishing a new method for durability analysis and design of a concrete structure.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a concrete damage transmission evaluation method under sulfate erosion in a splash zone. Background technique [0002] Sulfate attack is an important problem affecting the durability of cement-based materials, and it is also the main disease during the operation of structures in marine environments. Partial or large-area freeze-thaw damage can be observed in cement-based material structures in various projects, such as houses, roads, port bridges, etc. Under the effect of sulfate erosion, the surface of the structure will peel off and produce cracks, gaps, etc., which may cause the structure to have to spend a lot of money on maintenance or repair before reaching the end of its service life, resulting in a waste of resources and bringing economic and social benefits to the country. It will cause great losses, and it also violates the green environmental pr...

AI Technical Summary

Problems solved by technology

Under the effect of sulfate erosion, the surface of the structure will peel off and produce cracks, gaps, etc., which may cause the structure to have to spend a lot of money on maintenance or repair before reaching the end of its service life, resulting in a waste of resources and bringing economic and social benefits to the country. It will cause great losses, and it also violates the green environmental protection and energy-saving concepts proposed by countries around the world; at the same time, the peeling of the protective layer and structural deterioration caused by sulfate corrosion will accelerate the transmission of chloride ions, causing corrosion of steel bars

[0003] At present, a wide range of experimental and analytical studies have been carried out on the degradation law of concrete strength, stiffness and other mechanical properties caused by the chemical corrosion of concrete materials by sulfate attack, but the concrete corrosion damage constitutive structure closely related to the analysis of structural seismic performance There are few related experimental studies

Images