Accession Number : AD0012288


Title :   A NEW TYPE PENETROMETER FOR MEASURING CERTAIN SOIL PROPERTIES


Descriptive Note : Special rept. no. 2


Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD CHESAPEAKE BAY INST


Personal Author(s) : Powers, M C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/012288.pdf


Report Date : Nov 1952


Pagination or Media Count : 33


Abstract : The rigidense instrument was designed to measure the physical and chemical properties of underwater sediments in relations to the sinking of mines. The instrument measures the depth of penetration of an 11-cm-long, 2-cm- diam Pb a weight to which is attached a 37 deg Al cone. The rigidense measure was controlled by the smallest grade size having a weight 50% or more of the largest grade size in the sample. Only Ca-saturated clays were used in the laboratory tests. The success of sinking a mine into underwater surface sediments depends on frictional resistance in clean sand or gravel, and on cohesive resistance in clay. The rigidense instrument measures the cohesive and frictional properties of unconsolidated sediments and aids in studying their plastic properties.


Descriptors :   *PENETROMETERS , *OCEAN BOTTOM SOILS , PHYSICAL PROPERTIES , RESISTANCE , GRAVEL , SAND , DEPTH , PENETRATION , CLAY , PLASTIC PROPERTIES , FRICTION , CONICAL BODIES , SEDIMENTS , UNDERWATER , COHESION , LABORATORY TESTS , CHEMICAL PROPERTIES


Subject Categories : Soil Mechanics
      Physical and Dynamic Oceanography


Distribution Statement : APPROVED FOR PUBLIC RELEASE