deicers - Degradation of Concrete due to Deicing Chemicals...

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1 Degradation of Concrete due to Deicing Chemicals Amal Raj Jayapalan CEE 8813 April 25, 2007 Outline Introduction Chemicals used for deicing operation Methods of attack by deicers Testing methods for ASR Effect of different deicing chemicals New tests proposed for deicers FIB cyclic climates storage test Modified ASTM 1260 Mitigation techniques Scope for further research
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2 3 Introduction Anti-icing vs Deicing Deicing most widely used by agencies Anti-icing is a relatively new technique Preventive vs. reactive strategy Chemicals used at their eutectic temperature concentration Federal Highway Administration (FHWA) (1996) Common Deicing chemicals Sodium Chloride - NaCl 4.7 million tons annual usage in Canada [1] Calcium Chloride - CaCl 2 Magnesium Chloride - MgCl 2 Calcium Magnesium Acetate - Ca X Mg Y (CH 3 COO) 2(X+Y) Urea - (NH 2 ) 2 CO Sodium Acetate - Na(CH 3 COO) Sodium Formate - Na(HCOO) Potassium Acetate - K(CH 3 COO) Potassium Formate - K(HCOO) 1- Hassan et al. (2002)
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Methods by which deicing chemicals attack concrete Alkali-silica reaction Source of alkali Salt scaling Accelerates ASR [1] Sulfate attack Chloride attack on steel [1] - Berube et al. (2002) Tests conducted to study the effect of deicers on ASR Mortar bar/concrete prism expansion Initially NaCl was proposed to be used in tests [1] ASTM 1260 Many variations
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deicers - Degradation of Concrete due to Deicing Chemicals...

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