01515054

Component

With increased attention to service life, bridge decks are now being designed to perform for 75 to over 100 years without major repairs. In areas where deicing salts are used, sustainable and cost effective solutions utilize concretes with w/cm less than 0.4, concrete cover over the reinforcement greater than or equal to two inches, and/or additional corrosion protection measures such as corrosion resistant reinforcement or corrosion inhibitors. Concretes with w/cm less than 0.4 can be more susceptible to cracking, as well as requiring higher cement factors, even with the use of supplementary cementitious materials. The longer design life increases the risk of other degradation mechanism, such as alkali-silica reactions (ASR) which are expansive and can result in concrete cracking and deterioration. In this paper, data on an alternative solution, that could utilize more moderate cementitious levels, but still reduce chloride ingress, potentially raise chloride threshold levels, provide additional protection against ASR attack, and reduce differential shrinkage, by applying a very low surface tension organofunctional silane inhibitor to the surface, before exposure to chloride is discussed.

This paper was sponsored by TRB committee AFN30 Durability of Concrete. Alternate title: Organofunctional Silane Inhibitor Surface Treatment of Concrete for Corrosion and Mitigation of Alkali-Silica Reactions.

01503729

14-0763

English

18p

2014

Transportation Research Board 93rd Annual Meeting

Digital/other

Figures; References; Tables

Alkali silica reactions; Bridge decks; Concrete; Corrosion resistant materials; Deicing chemicals; Deterioration; Repairing; Service life

Bridges and other structures; Highways; Materials; I32: Concrete

Transportation Research Board Annual Meeting 2014 Paper #14-0763

TRIS, TRB, ATRI

Jan 27 2014 2:20PM