Accession Number : AD0730742

Title :   Apparatus and Tests for Determining Negative Pore Water Pressure Characteristics of Desiccated Clays.

Descriptive Note : Final rept. Jan 67-May 68,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Carlson,Charles A.

Report Date : MAY 1969

Pagination or Media Count : 52

Abstract : A study was conducted to evaluate the influence of negative pore water pressure development in expansive desiccated clays on building behavior. The report describes the apparatus and procedures for the determination of negative pore water pressure characteristics of dessicated clays. Three trials on specimens plus auxiliary tests were conducted on samples from a test site at Lackland AFB. A water content decrease from 28.5 to 25.5 percent was noted as the negative pore water pressure increased from 0 to 20 atm. The permeability of concrete suggested that foundation piers in some soils may act as wicks, conducting water downward beyond the inverted capillary fringe and zone of fissures.

Descriptors :   (*SOIL MECHANICS, *TEST METHODS), (*CLAY, PERMEABILITY), PERMEABILITY, POROSITY, MOISTURE, HYDROSTATIC PRESSURE, TEST EQUIPMENT, TEST METHODS

Subject Categories : Hydrology, Limnology and Potamology
      Soil Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE