Most soil mechanics laboratories still prefer the use of rough end platens during triaxial testing despite an awareness that nonuniform stress conditions occur within the soil specimen. This practice may to some extent be due to a lack of awareness of the magnitude of inaccuracies which may result. This paper describes results from unconsolidated undrained triaxial compression and extension tests in which pore pressures were monitored at the specimen base and at midheight using a circumferentially mounted miniature transducer. The rate of imposed displacement was varied by two orders of magnitude. The significance of displacement rate and specimen end condition is illustrated by presentation of resulting stress ratios and stress paths. Base measured pore pressures were found to be up to 50% higher than the midheight values, depending on the testing rate used. The results indicated that currently accepted criteria for the determination of acceptable displacement rates are adequate.
Gasmet Technologies has published a free White Paper and a video on the simultaneous measurement of multiple gases in a wide variety of applications using FTIR. Both the video and the White Paper can be foundhere at www.gasmet.comor by visiting the Quantitech stand 62/63 at AQE 2017.
With the ability to measure almost any gas, FTIR technology is employed in an enormous variety of applications including Continuous Emissions Monitoring, Stack Testing, Process Control, Industrial Hygiene, Engine Emissions, Semiconduc...
Abstract: This paper examines the advantages and limitations of CPTu and SCPTu as an exploration method for geotechnical engineering of Presumpscot Formation. Discussion will include typical results of CPTu and SCPTu data for Presumpscot Formation, application and use for settlement prediction, bearing capacity analysis, slope stability evaluation, and seismic design considerations. Intent is to provide an overview of the Use and Application of Piezocone Penetration Testing for the Presumpscot Formation in...
Liquid cooled engines and rotating equipment use glycol based coolants because of their excellent heat transfer abilities. However, glycol based coolants are not desirable at all in lubrication oil itself – Coolant ingression to the lubricant is a particularly nasty contaminant for the variety of damage it can cause. Glycol coolants break down in the high temperature engine environment, leading to formation of glycolic acids. These acids attack nonferrous bearing surfaces and form metal salts. The acids...
Quantitech has announced the publication of a free White Paper on the simultaneous measurement of multiple gases in a wide variety of applications using FTIR (Fourier Transform InfraRed) technology.
With the ability to measure almost any gas, FTIR monitoring technology is employed in an enormous variety of applications including Continuous Emissions Monitoring, Stack Testing, Process Control, Industrial Hygiene, Engine Emissions, Semiconductor Manufacturing, Emergency / First Response, Greenhouse Gas Monitoring,...
Upgrade balance testing security and compliance with WeightLink, an innovative tracking system that assigns unique, scannable identifiers to each weight. Learn how quick weight identification and automated data gathering enhance balance testing by downloading our free white paper as part of METTLER TOLEDO`s 2016 e-calendar.
Adjustment and testing of lab balances can be an arduous task. Difficulties are found not only the execution of procedures, but also in the possibility of misreading numbers when choosing and...
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