Influence of Silane Penetrating Sealer on Deicer Scaling and Absorption of Concrete Highway Pavement
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Concrete pavements generally show excellent performance; however, some have shown premature joint degradation at young age in recent years. There are many causes of premature deterioration including poor mix designs, reaction with deicers, and to fluid absorption. This study discusses the scaling on the surface of concrete produced using different aggregates, sawing techniques and equipment, and their performance after applying silane to the surface. In total 30 samples with and without silane coating were taken into consideration. Wisconsin limestone and granite were the two types of aggregates considered and one field section consisting of two distinct mix design were created. For measuring the durability properties 4% of NaCl solution was used following ASTM C 672. A gap was left on the vertical saw cut face to measure the joint deterioration on the vertical surface in addition to surface scaling. All samples underwent 50 cycles, one cycle per day and visual inspection after every 5 cycles was carried out and was recorded. After the testing was completed the samples were cut perpendicular from the vertical sawn cut face and reacted with silver nitrate solution to determine the chloride penetration. The absorption test was also conducted on silane treated and non-treated samples. Scaling results indicated that the treated samples had better performance than the non-treated samples. Silane coated samples of the granite samples had better performance than limestone samples. Various analyses were conducted to derive the conclusion.
Table of Contents
Introduction -- Literature review -- Concrete placement and mixture design -- Laboratory testing methodology -- Results and evaluation of samples -- Summary, conclusion & recommendations