Accession Number : ADA266316
Title : Length Change and Strength Development of Candidate Cement-Based Sealing Mixtures for the WIPP
Descriptive Note : Final rept.
Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
Personal Author(s) : Poole, Toy S ; Wakeley, Lillian D
Report Date : Apr 1993
Pagination or Media Count : 36
Abstract : The purpose of some of the research was to describe quantitatively how placing and early-age properties of candidate grouts and concretes are affected by temperature, humidity, and properties of component materials. Previous work had investigated the effect of changing cement and pozzolan sources on length-change and early strength development. Changing cement source was found to have some effect on early length change, but later-age length change tended to converge on a common value. Type K cement-based mixtures expanded more than Class H oil-well cement-based mixtures. Changing pozzolan source appeared to have a strong effect on expansion. Changes in w/c also appeared to be important. The effects of temperature and relative humidity have not been systematically investigated. Previous work on expansive behavior reported numerous instances when expansion mechanisms apparently failed. These events were attributed to poor sealing of specimens soon after casting, which allowed them to dry and consequently shrink. Companion specimens stored in water or in fog expanded. Clearly moisture availability is important, but the effect has not been quantified.
Descriptors : *CONCRETE , *STRENGTH(MECHANICS) , *SEALING COMPOUNDS , TEMPERATURE , HUMIDITY , CEMENTS , PHYSICAL PROPERTIES
Subject Categories : Adhesives, Seals and Binders
Distribution Statement : APPROVED FOR PUBLIC RELEASE