Field device to measure viscosity, density, and other slurry properties in drilled shafts : final report.

Mullins, Gray; Mullins, Miles; University of South Florida. Department of Civil and Environmental Engineering

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Field device to measure viscosity, density, and other slurry properties in drilled shafts : final report.

2016-04-01
By Mullins, Gray ; Mullins, Miles

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English

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Details:

Creators:

Mullins, Gray ; Mullins, Miles

Mullins, Gray ; Mullins, Miles Less -
Corporate Creators:

University of South Florida. Department of Civil and Environmental Engineering
Contributors:

Castellano, Juan
Corporate Contributors:

Florida. Department of Transportation
Subject/TRT Terms:

[+]

Augercast Pile Density Drilled Shafts Excavation Measuring Instruments Measuring Methods Quality Assurance Slurry Thermal Integrity Test Viscosity
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final report
Corporate Publisher:

Florida Department of Transportation
Abstract:

Proper performance of mineral slurries used to stabilize drilled shaft excavations is maintained by assuring the

density, viscosity, pH, and sand content stay within state specified limits. These limits have been set either by

past experience, research findings and/or by manufacturer recommended values. However, field slurry testing

is time consuming as all measurements are manually performed. With the overwhelming advances in digital

down-hole devices, it is not unreasonable to assume that slurry property tests are equally applicable to this

trend.

The most commonly used test to indicate slurry viscosity is the Marsh Funnel Test which is essentially a

timed flow for a fixed volume of slurry to exit a falling head funnel. Using a library of unique pressure versus

flow rate responses for a wide range of slurry viscosities, an automated downhole device was designed and

tested that incorporated these information to estimate viscosity in the excavation without the need to remove

slurry in order to test. Direct measurement of slurry density was also incorporated into the device and the sand

content was computed from density and the viscosity where the suspended solids that make up the density

stems from both the slurry products and the soil cuttings.

The prototype down-hole slurry testing system was shown to be surprisingly easy and fast to use

despite the experimental nature of the device. A shaft sampled at 6 different depths was tested in less

than 10 minutes. In contrast, conventional, manually performed testing were estimated by contractors

to have taken more than an hour to perform the same number of tests.
Format:

PDF
Funding:

BDV25 TWO977-09
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:1daffe05631ce71580ef0247b04b6c6f4ab0f20d7f6adb62ca7cce5202926529
Download URL:

https://rosap.ntl.bts.gov/view/dot/31051/dot_31051_DS1.pdf
File Type:

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Field device to measure viscosity, density, and other slurry properties in drilled shafts : final report.

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