A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Investigation of Slab Differential and Movement on I-83, Baltimore-Harrisburg Expressway
An investigation of faulted concrete paving slabs was conducted on sections of the Baltimore-Harrisburg Expressway, Interstate Route 83. Approximately 2-feet square portions of the concrete pavement were removed at six sites. At each test site, erosional pumping of an upper layer of screenings occurred, and the screenings were thicker under the approach slabs than under the leave slabs. Also, at each test site there was an intrusion of the fine-grained subgrade soil throughout the thickness of the open-textured subbase course. Observations showed that the 3/4 inch round dowels were broken in most instances. In other instances the dowel cavities were elongated, thereby resulting in dowel looseness. It is concluded that pumping was the primary source of faulting. In the trench type, undrained subbase, it appeared that water was impounded in the granular subbase. In the continuous through the shoulder type subbase, without underdrain, the drainage was probably affected by the upper layer of screenings and the low permeability characteristics of the subbase course. Some of the faulted areas have recently been corrected by mudjacking. The most important recommendation for correcting the pumping is believed to be the improvement of subsurface drainage conditions. (Author)
Investigation of Slab Differential and Movement on I-83, Baltimore-Harrisburg Expressway
An investigation of faulted concrete paving slabs was conducted on sections of the Baltimore-Harrisburg Expressway, Interstate Route 83. Approximately 2-feet square portions of the concrete pavement were removed at six sites. At each test site, erosional pumping of an upper layer of screenings occurred, and the screenings were thicker under the approach slabs than under the leave slabs. Also, at each test site there was an intrusion of the fine-grained subgrade soil throughout the thickness of the open-textured subbase course. Observations showed that the 3/4 inch round dowels were broken in most instances. In other instances the dowel cavities were elongated, thereby resulting in dowel looseness. It is concluded that pumping was the primary source of faulting. In the trench type, undrained subbase, it appeared that water was impounded in the granular subbase. In the continuous through the shoulder type subbase, without underdrain, the drainage was probably affected by the upper layer of screenings and the low permeability characteristics of the subbase course. Some of the faulted areas have recently been corrected by mudjacking. The most important recommendation for correcting the pumping is believed to be the improvement of subsurface drainage conditions. (Author)
Investigation of Slab Differential and Movement on I-83, Baltimore-Harrisburg Expressway
M. R. Kalb (author)
1972
83 pages
Report
No indication
English