Details:

Creators:
Sebesta, Stephen ; Taylor, Ross
Sebesta, Stephen ; Taylor, Ross Less -
Corporate Creators:
Texas Transportation Institute
Corporate Contributors:
Texas. Dept. of Transportation. Research and Technology Implementation Office
Subject/TRT Terms:
[+]
Soil Compaction Soil Compaction--Texas--Testing Soil Compaction Test Soil Stabilization Soil Tests
Publication/ Report Number:
FHWA/TX-11/5-5135-01-1 ; Project 5-5135-01
FHWA/TX-11/5-5135-01-1 ; Project 5-5135-01 Less -
Resource Type:
Tech Report
Geographical Coverage:
Texas
Edition:
Technical report; Sept. 2008-Aug. 2010.
Corporate Publisher:
Texas Transportation Institute
Abstract:
Test method Tex-113-E prepares laboratory aggregate base test specimens with an impact hammer

compactor. These specimens are used for compaction characteristics and design tests. Although the

historical Tex-113-E required a certain amount of compaction energy, no method to validate attainment of

that energy existed until Texas Department of Transportation (TxDOT) Project 0-5135 developed the Soil

Compactor Analyzer (SCA). The SCA measures the kinetic energy applied by each drop of the impact

hammer. In this project, the SCA system was modified to control the compactor, where the SCA starts the

machine and then turns off the compactor when the prescribed amount of energy is attained. This project

then evaluated how changing the machine operational parameters, such as hammer weight, drop height, and

number of blows per lift, impacted test results. In this evaluation, the SCA was used in all cases to control

the compactor, so the prescribed amount of total energy was always applied regardless of machine

operational parameters. The results showed that while using the current TxDOT-approved SCA to control

total energy per lift between 740 and 765 ft-lbf, the number of blows per lift may vary between 45 and 60

with no impact on test results. Finally, this project conducted an interlaboratory study to develop precision

statistics of Tex-113-E compaction. This study showed that the SCA enables excellent precision of total

compaction energy. Total compaction energy should be repeatable and reproducible within about 27 ft-lbf,

or approximately 1 percent of the specification value. Compacted dry density should be repeatable within

about 2.5 pounds per cubic foot (pcf) and reproducible within about 3.3 pcf.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:4f9744a037aaeabf6fe5c4f4c935fa8f21b972e7a61dd9f220070d648f365c39
Download URL:
https://rosap.ntl.bts.gov/view/dot/24259/dot_24259_DS1.pdf
File Type:

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