详情

原文传递 CROSS-TENSIONED CONCRETE PAVEMENT: AN ALTERNATIVE MODERN PCCP DESIGN.

题名：	CROSS-TENSIONED CONCRETE PAVEMENT: AN ALTERNATIVE MODERN PCCP DESIGN.
作者：	Hancock-J; Hossain-M
关键词：	Concrete-pavements; Cross-tensioning; Pavement-design; Posttensioning-
摘要：	The rapid deterioration of Portland Cement Concrete Pavement (PCCP) is most often due to intrusion of water into the pavement and foundation layers through transverse joints and cracks. To minimize this problem, transverse joints are sealed with a flexible sealant that allows the joint to open and close while keeping water out. However, water does eventually get in and deterioration begins due to freezing and thawing, erosion of the subbase, etc. One possible way to solve this problem is to eliminate all transverse joints and to constrict the cracking tendency of the pavement by applying an external force in the form of post-tensioning. The advancement of post-tensioning products and procedures over the last twenty years has made this a fairly simple and inexpensive procedure. A reduction in slab thickness and elimination of sawing and sealing transverse joints can offset the cost of the post-tensioning hardware and process. The limited success of post-tensioning PCCP in the past was due to the design of longitudinal post-tensioning within the slabs. Longitudinally post-tensioning PCCP requires the construction of gap slabs where the actual post-tensioning work takes place. The gap slabs tend to deteriorate very fast. The need for gap slabs can be eliminated by cross-tensioning PCCP. This procedure may not only eliminate the need for any transverse joints, but will also resist the tendency of the pavement to crack in any direction.
总页数：	Conference Title: Mid-Continent Transportation Symposium 2000. Location: Ames, Iowa. Sponsored by: Iowa State University
报告类型：	科技报告