Techno Press
Techno Press

Structural Monitoring and Maintenance   Volume 2, Number 1, March 2015, pages 35-48
DOI: http://dx.doi.org/10.12989/smm.2015.2.1.035
 
Impact of aggressive exposure conditions on sustainable durability, strength development and chloride diffusivity of high performance concrete
Suad Al-Bahar and A. Husain

 
Abstract     [Full Text]
    The main objective of this study is to evaluate the long-term performance of various concrete composites in natural marine environment prevailing in the Gulf region. Durability assessment studies of such nature are usually carried out under aggressive environments that constitute seawater, chloride and sulfate laden soils and wind, and groundwater conditions. These studies are very vital for sustainable development of marine and off shore reinforced concrete structures of industrial design such as petroleum installations. First round of testing and evaluation, which is presented in this paper, were performed by standard tests under laboratory conditions. Laboratory results presented in this paper will be corroborated with test outcome of ongoing three years field exposure conditions. The field study will include different parameters of investigation for high performance concrete including corrosion inhibitors, type of reinforcement, natural and industrial pozzolanic additives, water to cement ratio, water type, cover thickness, curing conditions, and concrete coatings. Like the laboratory specimens, samples in the field will be monitored for corrosion induced deterioration signs and for any signs of failureover initial period ofthree years. In this paper, laboratory results pertaining to microsilica (SF), ground granulated blast furnace slag (GGBS), epoxy coated rebars and calcium nitrite corrosion inhibitor are very conclusive. Results affirmed that the supplementary cementing materials such as GGBS and SF significantly impacted and enhanced concrete resistivity to chloride ions penetration and hence decrease the corrosion activities on steel bars protected by such concretes. As for epoxy coated rebars applications under high chloride laden conditions, results showed great concern to integrity of the epoxy coating layer on the bar and its stability. On the other hand corrosion inhibiting admixtures such as calcium nitrite proved to be more effective when used in combination with the pozzolanic additives such as GGBS and microsilica.
 
Key Words
    corrosion; deterioration; high performance concrete; marine and off shore structures; mineral admixtures; reinforced concrete
 
Address
Suad Al-Bahar and A. Husain: Construction and Buildings Materials Program, Energy and Building Research Center,
Kuwait Institute for Scientific Research, Safat 13109, Kuwait
 

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