Chloride Penetration through Cracks in High-Performance Concrete and Surface Treatment System for Crack Healing

Abstract

For enhancing the service life of concrete structures, it is very important to minimize crack at surface. Even if these cracks are very small, the problem is to which extend these cracks may jeopardize the durability of these decks. It was proposed that crack depth corresponding with critical crack width from the surface is a crucial factor in view of durability design of concrete structures. It was necessary to deal with chloride penetration through microcracks characterized with the mixing features of concrete. This study is devoted to examine the effect of high strength concrete and reinforcement of steel fiber on chloride penetration through cracks. High strength concrete is regarded as an excellent barrier to resist chloride penetration. However, durability performance of cracked high strength concrete was reduced seriously up to that of ordinary cracked concrete. Steel fiber reinforcement is effective to reduce chloride penetration through cracks because steel fiber reinforcement can lead to reduce crack depth significantly. Meanwhile, surface treatment systems are put on the surface of the concrete in order to seal the concrete. The key-issue is to which extend a sealing is able to ensure that chloride-induced corrosion can be prevented. As a result, penetrant cannot cure cracks, however, coating and combined treatment can prevent chloride from flowing in concrete with maximum crack width of 0.06 mm and 0.08 mm, respectively.

Durability of steel fiber reinforced self-compacting concrete

“…and presence of cracks [45]. Literature is mainly focused on corrosion arising from cracking process [20,51,34]. There are three main consequences of corrosion in SFRC associated to the cracking process: (1) a decrease of the carrying capacity and energy absorption performance of the SFRC element (more brittle behavior); (2) due to the rust formation from fiber corrosion process, fiber-paste friction can increase, enhancing the fiber pullout response, with beneficial effects in terms of load carrying capacity and energy absorption of the SFRC element; (3) if the crack width is small enough that self-healing almost restores SFRC integrity, fiber corrosion has negligible influence in terms of structural and durability performance [20].…”

Simulation of Chloride Diffusion in Cracked Concrete with Different Crack Patterns

“…Environmental temperature surrounding the system will also influence chloride binding isotherms. Freundlich binding isotherm (nonlinear binding isotherm) is effective in describing the relation between free chloride and bound chloride at a wide concentration range [15][16][17][18][19][20][21][22][23][24]. The equation of Freundlich binding isotherm is shown as follows [15][16][17][18][19][20][21][22][23][24]:…”

Sensitivity of Service Life Extension and CO2 Emission due to Repairs by Silane Treatment Applied on Concrete Structures under Time‐Dependent Chloride Attack

“…Some researchers studied another benefit of surface treatment. For example, Yoon [15] tested chloride penetration through cracks in highperformance concrete and surface treatment system for crack healing. ey concluded that penetrant could not cure cracks; however, coating and combined treatment could prevent chloride from flowing in concrete with maximum crack width of 0.06 mm and 0.08 mm, respectively.…”