A study of effects of a new agricultural-based deicer on the properties of pavement concrete
This study was aimed at evaluating effects of a new agricultural-based deicer named by the manufacturer as "Season I" on the properties of pavement concrete and its performance was compared with two traditional deicing salts: sodium chloride (NaCl) and calcium chloride (CaCl2). The study can be divided into three parts and the first part evaluated physical frost damage including scaling and structural degradation of concrete/mortar. Strength loss, mass loss and scaling rating due to the damage were given. The second part inspected the effects of deicers on surface skid resistance and concrete permeability. The skid resistance indicator, BPN, and indirect concrete permeability indicators including electrical resistivity, air permeability index and water absorption rate were tested in this part. In the last part, the results of EDS point analyses were presented and discussed. The goal was to identify change/damage, if any, of micro-structures caused by the penetration of deicers.
The results of this study indicate NaCl and CaCl2 solutions caused worse scaling and structural degradation comparing with Season I. Application of Season I greatly reduced the skid resistance comparing with NaCl and CaCl2 solutions which had no apparent impacts. Season I reduced concrete permeability comparing with NaCl and CaCl2 solutions based on electrical resistivity and water absorption rate. The EDS analyses found penetration depth of Season I was 13 mm and the penetration depth of NaCl was 19 mm. No salt precipitate or micro-structure change was found.