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原文传递 Design of a High-Performance Concrete Mix for use in Dowel Bar Retrofit. Research rept.

题名：	Design of a High-Performance Concrete Mix for use in Dowel Bar Retrofit. Research rept.
作者：	KATTI, D.; SALAHELDIN, M.; YAZDANI, F.
关键词：	Highway-maintenance; Retrofitting-; *Concrete-pavements.;Concretes-; Load-transfer; Laboratory-tests; Admixtures-; Pavement-joints; Literature-review; Material-tests.
摘要：	Dowel bar retrofit is a method of restoring load transfer at faulted joints in concrete pavement by using smooth dowel bars placed in slots cut at the joint. The North Dakota Department of Transportation has experimented with this method for repairing some of the state's concrete highways. Although this method has proven to be effective in restoring load transfer, some of the sites have experienced distress associated with the commercially available concrete mixes used for patching the slots. These mixes have shown problems with durability and shrinkage as well as being expensive. The objective of this research was to develop a high-performance patch mix using locally available materials. The concrete mix should exhibit several important properties including high early strength, good workability, low shrinkage, and good durability. In this research, laboratory tests were performed with different percentages of admixtures, cement, and water/cement ratios. Various combinations of ingredients were tested until an optimum mix exhibiting that produced a mix with all the targeted properties was reached.
报告类型：	科技报告