Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Construction Experience with CRC Pavements in Illinois
Developing mechanical means for economically setting steel reinforcing in a continuously reinforced concrete (CRC) pavement was one objective of a study Illinois started in 1960. While constructing six experimental pavements between 1963 and 1966, one bar assembly machine and several reinforcement depressors were developed; however, slipform pavers that feed the longitudinal bars through a series of tubes, eliminating the use of transverse bars, have replaced the use of side forms, and now is the most common way of placing CRC pavement in Illinois. Experience indicates that CRC pavement must be built more carefully than conventional jointed pavements; otherwise, insufficient lap and gaps in reinforcement as well as unconsolidated concrete around the reinforcing steel, particularly at joints, will cause early failures. To repair a CRC pavement successfully, patches should be at least 10 feet from construction joints; reinforcing steel exposed for lapping should not be bent above the pavement surface; new steel should be supported on chairs at the same level as the existing steel and should be securely tied; and damaged steel within the lap area, when less than 10 percent, may be repaired by welding; otherwise, welding is not permitted.
Construction Experience with CRC Pavements in Illinois
Developing mechanical means for economically setting steel reinforcing in a continuously reinforced concrete (CRC) pavement was one objective of a study Illinois started in 1960. While constructing six experimental pavements between 1963 and 1966, one bar assembly machine and several reinforcement depressors were developed; however, slipform pavers that feed the longitudinal bars through a series of tubes, eliminating the use of transverse bars, have replaced the use of side forms, and now is the most common way of placing CRC pavement in Illinois. Experience indicates that CRC pavement must be built more carefully than conventional jointed pavements; otherwise, insufficient lap and gaps in reinforcement as well as unconsolidated concrete around the reinforcing steel, particularly at joints, will cause early failures. To repair a CRC pavement successfully, patches should be at least 10 feet from construction joints; reinforcing steel exposed for lapping should not be bent above the pavement surface; new steel should be supported on chairs at the same level as the existing steel and should be securely tied; and damaged steel within the lap area, when less than 10 percent, may be repaired by welding; otherwise, welding is not permitted.
Construction Experience with CRC Pavements in Illinois
J. S. Dhamrait (Autor:in) / F. K. Jacobsen (Autor:in) / P. G. Dierstein (Autor:in)
1977
61 pages
Report
Keine Angabe
Englisch
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