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|Title:||An investigation of the frost resistance of air-entrained and nonair-entrained roller-compacted concrete (RCC) mixtures for pavement applications|
|Authors:||Structures Laboratory (U.S.)|
Ragan, Steven A.
Pittman, David W.
Grogan, William P.
Freezing and thawing cycles
Pavement condition survey
Roller-compacted concrete (RCC)
Frost resistant concrete
Air content of concrete
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-90-18.|
Abstract: Roller-compacted concrete (RCC) pavements employ a relatively new paving technique in which a zero-slump portland cement concrete mixture is placed using asphalt concrete pavers and compacted with vibratory and rubber-tired rollers. RCC pavements have been widely used by the US Army for such applications as motor pools and tank trails, primarily because of its low construction cost and ability to withstand tank traffic. One of the chief concerns for using RCC pavements is the durability of RCC in freezing and thawing conditions. Conventional concrete pavements are normally air-entrained to protect the concrete in freezing and thawing conditions; however, attempts to air-entrain RCC mixtures have met with little success. Although, the nonair-entrained RCC has performed well in freezing and thawing field conditions in the past, samples from these pavements tested in the laboratory have demonstrated poor frost resistance. Since the demand for RCC pavements by the US Army for hardstands in freezing and thawing areas has increased each year, the question of the frost resistance of RCC had to be addressed. The two objectives of the study presented in this report are: (a) to determine if a proper air-void system can be entrained in RCC pavement mixtures proportioned with several types and dosage rates of air-entraining admixtures and with various aggregate gradings, and (b) to evaluate the frost resistance of nonair-entrained RCC pavement mixtures and investigate material, construction, and site conditions which might influence the frost resistance of RCC pavements. The results of the air-entrained RCC study demonstrated that a variety of RCC mixtures with various AEA types and dosage rates, and with various aggregate gradings, may be entrained with air voids sufficient to protect the concrete from frost damage. Four test pads built at WES, and a small test strip at Fort Drum, New York, verified that RCC may also be effectively air-entrained in field applications. The results of the nonair-entrained study demonstrated that the eleven RCC pavement sites that were surveyed (in the United States, West Germany, Norway, and Sweden) in freezing and thawing climates have performed successfully in their environment, despite being nonair-entrained. Most of the pavement samples obtained from the sites (none were obtained from West Germany) performed poorly in laboratory tests for frost resistance. NOTE: This file is very large. Please allow your browser several minutes to download the file.
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