History of Concrete Paving In Iowa - Iowa State University Extension ...
History of Concrete Paving In Iowa - Iowa State University Extension ...
History of Concrete Paving In Iowa - Iowa State University Extension ...
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Preparation <strong>of</strong> Subgrade<br />
• 1920’s<br />
• Sprinkle with water<br />
uniformly moist or<br />
cover with tar paper<br />
• Plastic 1960