PSU/WES Interlaboratory Study of an Experimental Cementitious Repository Seal Material

摘要

Two separate laboratories are investigating the possible use of portland-cement grout as a repository sealing material for underground isolation of nuclear waste. The laboratories are the Materials Research Laboratory of The Pennsylvania State University (PSU) and the Structures Laboratory (SL) of the US Army Engineer Waterways Experiment Station (WES). The project manager, Mr. Floyd L. Burns of the Office of Nuclear Waste Isolation (ONWI), suggested that these laboratories make a comparative study to determine their ability to obtain results of similar precision and accuracy on potential repository seal materials. This report gives the results of this study. The same cementitious grout mixture was prepared in each laboratory in September 1980, and tests were started. Tests included characterization of cement and fly ash by chemical, physical, x-ray diffraction, and other procedures. Tests of hardened specimens included restrained expansion, compressive strength, modulus of elasticity, density, and permeability and characterization by x-ray diffraction and scanning electron microscopy. Each laboratory made many of the same tests and some that were not directly comparable. There was generally good agreement between the results of the tests that were performed by both laboratories. The results indicated that the starting materials received from a common source were highly similar as evaluated in the two laboratories. (ERA citation 07:061809)