Accession Number : AD0428611


Title :   IDENTIFICATION OF CONCRETE IN TUNNEL LINING BY AN ADMIXTURE OF FLUORESCENT DYES CLEAR CREEK TUNNEL- -TRINITY RIVER DIVISION CONTRAL VALLEY PROJECT.


Corporate Author : BUREAU OF RECLAMATION DENVER COLO


Personal Author(s) : Karpoff,K P


Report Date : 23 Sep 1963


Pagination or Media Count : 7


Abstract : Clear Creek Tunnel was driven through many different types of rock ranging from solid with adequate cover to highly fractured with relatively little cover. This variability in material and environment required the specification of concretes of different quality, as determined by compressive strength tests. These strengths ranged as high as 5,000 psi in sections which ranged from nonreinforced to heavily reinforced. Upon completion of lining and grouting, cores were to be extracted to assure that the specified strengths had been obtained in the in-place lining. For maximum value from results, it was necessary to be able to identify the exact batch from which the cores originated. To accomplish this, tests were performed to evaluate the amount required and the efficacy of additions of fluorescent dyes to the concrete batch prior to placement as well as the effects of the dyes on strength development. It was hoped that the treated batches in place in the lining could then be located and their limits defined by use of an ultraviolet ray lamp. Thus results of tests performed on cores and control cylinders fabricated at the batch plant could be correlated. Results of this investigation are reported. (Author)


Descriptors :   *CONCRETE , IDENTIFICATION , DYES , FLUORESCENCE , COMPRESSIVE PROPERTIES , QUALITY CONTROL , CYLINDRICAL BODIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE