Constructing and Controlling Compaction of Earth Fills (ASTM by Donald W. Shanklin, Keith R. Rademacher, and James R.

By Donald W. Shanklin, Keith R. Rademacher, and James R. Talbot, editors

This certain quantity explores using a number of standardized tools for specifying and controlling the compaction of soils for engineered built earth fills. issues tackle the historic historical past, present cutting-edge practices, case histories of not easy events, new matters concerning acceptable layout parameters for compaction keep an eye on, and new ways to overview soil compaction and different comparable features. additionally incorporated is a paper at the historical past of the improvement and use of the nuclear gauge within the qc of built earth fills. The nuclear gauge has had the one greatest effect of any expertise within the final 30 years within the box of compaction keep an eye on. the various papers in integrated during this quantity use the nuclear gauge because the foundation for comparability of the result of box density and water content material measurements. 21 papers divided into three sections learn: • Compaction regulate expertise and comparability of present equipment • purposes and classes discovered within the box • Soil Liner development and New Compaction know-how For Geotechnical, Civil, and development Engineers

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Extra resources for Constructing and Controlling Compaction of Earth Fills (ASTM Special Technical Publication, 1384)

Example text

Control of Mixed Soils For soils containing 10 to 20% fines, it is difficult to determine whether rapid method or relative density will control. Our specifications state that in these mixed soils, both tests should be run to determine which one will require the highest fill density. This issue is usually resolved at the start of construction. In-place Density Testing For silty and clayey soils, it is standard Reclamation procedure to use an 8-inch diameter sand cone. The depth of the hole is generally 10-12 inches.

Impact testing was also quite variable and was susceptible to errors in uniform soils. It is unfortunate that the 1970's ASTM study was performed prior to development of reliable table calibration methods. Most of the errors reported could be attributed to variation of table performance. Many of the tables used in those studies may have been found not to supply sufficient/consistent compactive effort. Reclamation performs the test with the vibrating table in accordance with ASTM procedures. A calibration method using linear variable transducers and oscilloscope is used on a surcharged table [20].

Roller curves are statistical accumulations of in-place moisture and density data from construction of a single dam. The roller curve for the total material is from all of the in-place density data. The fill density of the control fraction is computed from measurements on the gravel to be discussed later. For the Trenton Dam with no gravel, the D ratio for the control fraction exceeds the laboratory value. For Anderson Ranch with an average of 11% oversize the fill values are still higher than the laboratory.

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