Cement Concrete Pavement Panels Off The Empty Evaluation And Grouting Technology

The crux of void detection is how to discern the influence caused by indefinite load-transfer capacity and void separately on deflection. It is apparent that only using deflection as the criterion to detect void is impractical. Based on the new formed joint model, a variety of influential factors on First Limitation Load of Load-transfer Condition and Correlated Deflection are discussed. The result shows that the influence on deflection caused by void is noticeable. Then, a model and a method for void detection, which use First Limitation Load of Load-transfer Condition and Correlated Deflection-not single deflection-as their criteria, are proposed. This model makes void detection based on single PCC pavement system and eliminates the influence caused by indefinite load-transfer capacity. The typical relationship between void and deflection is given, which makes it possible to apply FWD to quick void detection.The author excogitated a kind of appropriative mud jacking material which is made up of cement, sand, fly ash, admixture and water. This material which was developed on the basis of large amount of tests has the proprieties of good self-flowing density, high earlier strength,non-segregation, non-weepage and non-contractility. Especially, the author aim at dealing with pumping mud and earlier maintained developed a kind of high flow grade material which can meet the requirement of mud jacking. At the final part of this paper, its construction technology had been developed. Practice results testified that the squeezing effect is good.