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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Development <strong>of</strong><br />
Slip Form Paver<br />
• 1947 – James Johnson & Bert<br />
Myers Office <strong>of</strong> Materials<br />
conceptualized extrusion<br />
process<br />
▫ 18” wide / 3” thick sidewalk<br />
• 1948 - Improved prototype<br />
produced 4’ wide 5” thick<br />
sidewalk<br />
• 1949 – Full scale prototype<br />
placed 1 st slip form pavement in<br />
Obrien & Cerro Gordo county<br />
▫ Two 10ft passes<br />
▫ 3-4” gap filled with AC
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