Using the Dynamic Cone Penetrometer and Light Weight Deflectometer for Construction Q

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Using the Dynamic Cone Penetrometer and Light Weight Deflectometer for Construction Quality Assurance

Author: John Siekmeier ; Cassandra Pinta; Scott Merth; Julie Jensen ;Peter Davich; Felipe Camargo; Matthew Beyer | Size: 7.3 MB | Format: PDF | Publisher: Minnesota Department of Transportation Research Services Section 395 John Ireland Boulevard, MS 330 St. Paul, Minnesota 55155-1899 | Year: 2009 | pages: 244 | ISBN: --

The final products resulting from this research implementation project are the specification target values for both granular materials and fine grained soils. For compacted granular material, the grading number and field moisture content are used to select the appropriate DCP and LWD target value. A sieve analysis is used to determine the grading number and an oven dry test or reagent test is typically performed to determine the field moisture content. For compacted fine grained soil, the plastic limit and field moisture content are used to determine DCP and LWD target values. In this case, the plastic limit is used rather than the grading number to classify the soil and is also used to estimate the optimum moisture content for compaction. In addition to these target values, this report provides further standardization of the testing procedures for both the LWD and DCP. This will ensure greater uniformity by personnel conducting these tests. Currently, the method for obtaining a DPI value is varied, involving different numbers of seating drops and measurement drops. Using three seating drops and five to ten measurement drops, depending on the material type, is recommended in this report. LWD testing includes variations as well and the Mn/DOT Grading and Base section is currently defining the seating depth and other aspects of the procedure for implementation during the 2009 construction season. The LWD device is currently non-standardized nationally, allowing manufacturers to develop different models, which produce different measurements. Because Mn/DOT has decided to establish predetermined target values it is necessary to select a specific LWD such that the buffer and plate stiffnesses are also constant along with the specified falling mass, peak force, and plate diameter.

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