Abstract
This paper examines the abrasion resistance of high early-strength concrete developed for rapid repair of highways and bridge decks. The cement types chosen for this study included ASTM Type III, ASTM Type V, and Calcium Sulfoaluminate (CSA) cements. A cement content of 386 kg/m3 (650 lb/yd3) was maintained for all studied concretes. Test samples were tested after 24 hours and 28 days of curing in order to evaluate compressive strength and depth of wear. Test results revealed that the opening time to attain minimum required compressive strength for CSA cement concrete was one hour, whereas the values for Type V and Type III cement concretes were 8.5 and 6 hours, respectively. After 24 hours curing, CSA cement concrete displayed the highest strength, but lowest resistance to wear. The 28-day cured CSA cement concrete produced the highest strength and resistance to abrasion, while Type III cement concrete showed a similar strength, but lower resistance to wear, when compared to those of the Type V cement concrete.
Highlights
With more than 60% of the US interstate highway system paved with concrete, surface wear due to traffic loading or environmental conditions is one of the main reasons that can reduce the quality of ride
When Type V Portland cement was used, the initial setting time of High Early-Age Strength (HES) concretes was at approximately 85 minutes, whereas the final setting time was 169 minutes
Since the studied concretes made with Type III Portland cement had a higher water-to-cement ratio, it would suggest that its C3S and Blain Fineness had greater influence on setting time than water-tocement ratio
Summary
With more than 60% of the US interstate highway system paved with concrete, surface wear due to traffic loading or environmental conditions is one of the main reasons that can reduce the quality of ride. Some of their long-term properties may be compromised in exchange for rapid strength development They tend to be used as emergency repairs and in high priority situations such as inner-city freeway exchanges and airport runways, or situations in which a significant cost is associated with the elapsed closure time. In this context, an experimental program was undertaken to compare the effect of different cement types on abrasion resistance and compressive strength development at different curing ages for rapid repair of concrete pavements and highways
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