Which transmission method is the preferred method for measuring the density of soil and soil aggregate?
1.4. 1 Procedure A describes the direct transmission method in which the gamma source rod extends through the base of the gauge into a pre-formed hole to a desired depth. The direct transmission is the preferred method.
How does a nuclear compaction test work?
In geotechnical engineering, a nuclear densometer or soil density gauge is a field instrument used to determine the density of a compacted material. The device uses the interaction of gamma radiation with matter to measure density, either through direct transmission or the “backscatter” method.
What is a field density test?
Soil field density test (FDT) is a common test conducted in construction work especially the one related to earthwork. Soil field density test measures relative density of soil which has been compacted using compacting equipment and the result of this test is expressed in %.
What is in-place density?
In-place density is a critical property of CIR pavements for good long-term performance. There is no standard procedure for measuring the in-place density of the compacted CIR during construction. The sand cone method must be coupled with the parafilm method for measuring the density of filed cores.
What is ASTM D698?
ASTM D698 : Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3 ))
What is the maximum dry density of soil?
The mass density measured as 2.62 g/cm3 corresponds to the skeletal mass density of sand. The theoretical minimum void ratio of 0.50 corresponds to a maximum dry density of 1.74 g/cm3, while the theoretical maximum void ratio of 0.78 corresponds to a minimum dry density of 1.47 g/cm3.
What does 95 percent compaction mean?
95 percent compaction means that the soil has been compacted to 95 percent of the possible density of the soil through compactive efforts. Maximum dry density, along with optimum moisture content, is determined in the laboratory and provides the target for field compaction.
Why field density test is important?
The field density of natural soil is necessary for the estimation of soil bearing capacity with the aim of evaluation of pressures on underlying strata for computation of stability and settlement analysis of natural slope.
What is in place density of soil?
The in-place wet density of the soil is determined by dividing the wet mass of the removed material by the volume of the hole.