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Full-Text Articles in Engineering
Excessive Strand End Slip In Prestressed Piles, Michael F. Petrou, Baolin Wan, Walter S. Joiner, Constantin G. Trezos, Kent A. Harries
Excessive Strand End Slip In Prestressed Piles, Michael F. Petrou, Baolin Wan, Walter S. Joiner, Constantin G. Trezos, Kent A. Harries
Civil and Environmental Engineering Faculty Research and Publications
This paper presents the results of a research project that investigated excessive strand end slip observed recently in some prestressed piles. From measurements taken in the field, it is apparent that the problem o excessive initial strand slip is independent of pile shape and size. Strand end slip is evident in piles of different manufacturers in different states in the Southeast. Excessive strand end slip was found in both the top and bottom of the cross section of the piles, although the top portion of the cross section generally exhibited much higher initial slip. Several preventive measures can be adopted …
Influence Of Mortar Rheology On Aggregate Settlement, Michael F. Petrou, Baolin Wan, Francis Gadala-Maria, Venkata Giri Kolli, Kent A. Harries
Influence Of Mortar Rheology On Aggregate Settlement, Michael F. Petrou, Baolin Wan, Francis Gadala-Maria, Venkata Giri Kolli, Kent A. Harries
Civil and Environmental Engineering Faculty Research and Publications
The influence of the rheology of fresh concrete on the settlement of aggregate is examined. Fresh concrete exhibits a yield stress that, under certain conditions, prevents the settlement of coarse aggregate, although its density is larger than that of the suspending mortar. Calculations, based on estimates of the yield stress obtained from slump tests, predict that aggregate normally used in concrete should not sink. To test this prediction, the settlement of a stone in fresh mortar is monitored. The stone does not sink in the undisturbed mortar (which has a high yield stress), but sinks when the mortar is vibrated, …
Preferences For Permitted And Protected Left-Turn Signal Displays, Alexander Drakopoulos, Richard W. Lyles
Preferences For Permitted And Protected Left-Turn Signal Displays, Alexander Drakopoulos, Richard W. Lyles
Civil and Environmental Engineering Faculty Research and Publications
Twenty-two different signal displays for permitted and protected left turns were evaluated from a driver comprehension perspective. The objective was to identify which alternate signal displays used to convey the same left-turn message to the driver are better comprehended and therefore recommended for use in the field. Protected displays compliant with the Manual on Uniform Traffic Control Devices were found to be better comprehended than certain noncompliant displays; however, some noncompliant permitted displays were found to outperform their compliant counterparts. Regional comprehension biases are nonexistent for the most part, regardless of display compliance with the Manual on Uniform Traffic Control …