Work Item
ASTM WK68393

New Test Method for Standard test method for determination of thermal resistivity of Cementious Products by thermal needle probe procedure

1. Scope

Development of a procedure to determine the thermal resistivity of a Cementious product. To establish a dry out curve which registers a Rho value of a sample or set of samples from saturated to dry. The procedure is based on the theory that the rate of temperature rise of a electrical line heat source is dependent on the thermal constants in the medium in which it is placed.


Thermal backfill; thermal concrete; thermal meter, thermal needle probe


Currently there are no standards that cover a procedure for determining the Thermal resistivity of a cementious material. Currently each individual or group testing for thermal resistivity, have been left to develop their own procedures. This is causing a disconnect between the electrical engineers and testing. Testing can not ne verified. Because there are no standards, in many cases the relationship between thermal resistivity and moisture content is not being established. This standard would be used for all cementious product placed around electrical conduits where knowing what the thermal resistivity (or displacement of heat)is critical. The end users will be Ready Mix companies, private labs, project owners, and others.

The title and scope are in draft form and are under development within this ASTM Committee.


Developed by Subcommittee: C09.64

Committee: C09

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 05-21-2019

Technical Contact: Tim Whitehall

Item: 000