Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance of Michigan's Postwar Concrete Pavement
In 1963 the M.S.H.D. began a survey of pavements that had been in service for 5, 10, and 15 years. Condition and roughness surveys were conducted on 520 construction projects which were considered identifiable units. Preliminary analyses showed weak relationships with only minor distress at 5 years so the major effort is placed on 10 and 15-year old pavements that were relatively obsolete in design since they contained 1 inch dowels, 99 foot slabs, and poor joint sealants. Measurements were made of transverse and longitudinal cracking, corner breaks, spalls, blow-ups, mud jacking, patching, and infiltration cracking. It was found that most of these defects increased directly with time. Roughness measurements were evaluated and rejected as an ineffective measure of rigid pavement condition. Nine variables were selected and combined by multiple regression into a structural deterioration index that is similar to the PSI measure but more sensitve to the structural condition. The index is summed over time to obtain a performance type concept that is labeled 'depreciation.' The design, construction and environmental causes of distress such as rainfall, temperature, contractor, subgrade, time of construction, ADT, subbase, and coarse aggregate were investigated and it was found that the ADT and the amount of soft particles in the aggregate have the most effect on performance. (BPR Abstract).
Performance of Michigan's Postwar Concrete Pavement
In 1963 the M.S.H.D. began a survey of pavements that had been in service for 5, 10, and 15 years. Condition and roughness surveys were conducted on 520 construction projects which were considered identifiable units. Preliminary analyses showed weak relationships with only minor distress at 5 years so the major effort is placed on 10 and 15-year old pavements that were relatively obsolete in design since they contained 1 inch dowels, 99 foot slabs, and poor joint sealants. Measurements were made of transverse and longitudinal cracking, corner breaks, spalls, blow-ups, mud jacking, patching, and infiltration cracking. It was found that most of these defects increased directly with time. Roughness measurements were evaluated and rejected as an ineffective measure of rigid pavement condition. Nine variables were selected and combined by multiple regression into a structural deterioration index that is similar to the PSI measure but more sensitve to the structural condition. The index is summed over time to obtain a performance type concept that is labeled 'depreciation.' The design, construction and environmental causes of distress such as rainfall, temperature, contractor, subgrade, time of construction, ADT, subbase, and coarse aggregate were investigated and it was found that the ADT and the amount of soft particles in the aggregate have the most effect on performance. (BPR Abstract).
Performance of Michigan's Postwar Concrete Pavement
L. T. Oehler (Autor:in) / L. Holbrook (Autor:in)
1970
141 pages
Report
Keine Angabe
Englisch
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