Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Very Early Post-Tensioning of Prestressed Concrete Pavements
Temperature and shrinkage cracks occur in long prestressed concrete pavements during the first night after casting, before the post-tensioning schedules and current design criteria by ACI, PTI, and AASHTO do not guarantee that compression can be introduced before the cracks form. The report (1) presents a more detailed discussion of the problem of temperature and shrinkage cracking, (2) reviews some of the literature on early concrete strength and anchorage zone stresses, (3) describes tests on the capacity of anchorage zone for very early post-tensioning, and (4) recommends a post-tensioning schedule accompanied by design aids. Experimental test variables included slab thickness, strand spacing, anchor size, and time from casting.
Very Early Post-Tensioning of Prestressed Concrete Pavements
Temperature and shrinkage cracks occur in long prestressed concrete pavements during the first night after casting, before the post-tensioning schedules and current design criteria by ACI, PTI, and AASHTO do not guarantee that compression can be introduced before the cracks form. The report (1) presents a more detailed discussion of the problem of temperature and shrinkage cracking, (2) reviews some of the literature on early concrete strength and anchorage zone stresses, (3) describes tests on the capacity of anchorage zone for very early post-tensioning, and (4) recommends a post-tensioning schedule accompanied by design aids. Experimental test variables included slab thickness, strand spacing, anchor size, and time from casting.
Very Early Post-Tensioning of Prestressed Concrete Pavements
J. S. O'Brien (Autor:in) / N. H. Burns (Autor:in) / B. F. McCullough (Autor:in)
1985
175 pages
Report
Keine Angabe
Englisch
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