Accelerated laboratory evaluation of surface treatments for protecting concrete bridge decks from salt scaling

Abstract In this accelerated laboratory study, several commercial products of surface treatment were included in the test program, including three concrete sealers, two crack sealants, and two water repellents. To characterize the product longevity under traffic, the abrasion resistance of concrete treated by each product was tested. To characterize the product effectiveness against salt scaling, the surface treated concrete cylinders were subjected to the joint action of 15 freeze/thaw and wet/dry cycles and exposure to a diluted deicer simulated by 3 wt.% NaCl solution. The mass loss of these concrete cylinders during the freeze/thaw cycles was periodically measured. For mechanistic investigation, the surface-treated concrete specimens were further tested for their water absorption rates, gas permeability, and water contact angle. For all the laboratory tests, the untreated concrete was used as control. The results confirmed the benefits of using these products to treat the surface of concrete against salt scaling, as all of them exhibited outstanding performance and reduced the mass loss of the concrete by 90% or more. Among them, two products (epoxy-based sealer T48CS and water repellent ATS-42) exhibited the best performance in protecting the concrete from salt scaling and featured the highest resistance to abrasion and generally lower water absorption rates and gas permeability coefficients. The results suggest that high resistance to both gas and water penetration is a crucial property in a good surface sealer, crack sealant or water repellent applied to concrete.

[1]  Carlo Pistolesi,et al.  Ethyl silicate for surface protection of concrete: Performance in comparison with other inorganic surface treatments , 2013 .

[2]  W. Hartt,et al.  Laboratory investigation of reinforcement corrosion initiation and chloride threshold content for self-compacting concrete , 2010 .

[3]  Iraj H. P. Mamaghani,et al.  Evaluation of Penetrating Sealers for Reinforced Concrete Bridge Decks , 2009 .

[4]  Omar S. Baghabra Al-Amoudi,et al.  Effectiveness of surface coatings in improving concrete durability , 2003 .

[5]  H. Moon,et al.  Evaluation of the durability of mortar and concrete applied with inorganic coating material and surface treatment system , 2007 .

[6]  L. Fay,et al.  Deicer Impacts on Pavement Materials: Introduction and Recent Developments , 2009 .

[7]  Xianming Shi,et al.  Laboratory Investigation and Neural Networks Modeling of Deicer Ingress into Portland Cement Concrete and its Corrosion Implications , 2010 .

[8]  Iraj H. P. Mamaghani,et al.  Application of Sealing Agents in Concrete Durability of Infrastructure Systems , 2007 .

[9]  Marcelo Henrique Farias de Medeiros,et al.  Surface treatment of reinforced concrete in marine environment: Influence on chloride diffusion coefficient and capillary water absorption , 2009 .

[10]  Xianming Shi,et al.  Effect of nanoparticles on the anticorrosion and mechanical properties of epoxy coating , 2009 .

[11]  F. H. Dakhil,et al.  Use of Surface Treatment Materials to Improve Concrete Durability , 1999 .

[12]  Pietro Lura,et al.  Ethyl silicate for surface treatment of concrete – Part II: Characteristics and performance , 2012 .

[13]  月永 洋一,et al.  The deicer salt scaling deterioration of concrete-An overview , 1998 .

[14]  W. Sigle,et al.  Surprising results of a study on the plasticity in strontium titanate , 2001 .

[16]  N. Xie,et al.  Durability of steel reinforced concrete in chloride environments: An overview , 2012 .

[17]  Xianming Shi,et al.  Self-Repairing Coating for Corrosion Protection of Aluminum Alloys: Proof-of-Concept Using Cagelike Smart Particles , 2009 .

[18]  John J. Valenza,et al.  A review of salt scaling: I. Phenomenology , 2007 .

[19]  Xianming Shi,et al.  Transport Properties of Carbon-Nanotube/Cement Composites , 2012, Journal of Materials Engineering and Performance.

[20]  A. Alshamsi,et al.  Development of a permeability apparatus for concrete and mortar , 2002 .

[21]  G. G. Litvan,et al.  PHASE TRANSITIONS OF ADSORBATES: VI, EFFECT OF DEICING AGENTS ON THE FREEZING OF CEMENT PASTE , 1975 .

[22]  Elisa Franzoni,et al.  Ethyl silicate for surface treatment of concrete – Part I: Pozzolanic effect of ethyl silicate , 2012 .

[23]  Charles Korhonen,et al.  Effect of High Doses of Chemical Admixtures on the Freeze-Thaw Durability of Portland Cement Concrete , 2002 .

[24]  George W. Scherer,et al.  A review of salt scaling: II. Mechanisms , 2007 .

[25]  George W. Scherer,et al.  Mechanism for Salt Scaling , 2006 .

[26]  M. Pigeon,et al.  Durability of Concrete in Cold Climates , 1995 .

[27]  L. Fay,et al.  Freeze–thaw damage and chemical change of a portland cement concrete in the presence of diluted deicers , 2010 .

[28]  Xianming Shi,et al.  A FESEM/EDX investigation into how continuous deicer exposure affects the chemistry of Portland cement concrete , 2011 .

[29]  D. Cleland,et al.  Freeze–thaw resistance of concretes treated with pore liners , 2006 .

[30]  G. D. Schutter,et al.  Evaluation of water absorption of concrete as a measure for resistance against carbonation and chloride migration , 2004 .

[31]  Yajun Liu,et al.  Stochastic Modeling of Service Life of Concrete Structures in Chloride-Laden Environments , 2012 .