JSCE STANDARDS “TEST METHOD FOR MEASURING RESISTIVITY OF PATCHING REPAIR MATERIALS WITH FOUR ELECTRODES”

A Method of Measuring Earth Resistivity

A knowledge of earth resistivity ^ (or specific resistance) maybe of value in determining something of the composition of earth, such for example, as moisture content, whether it contains oil, ore of high conductivity, etc., or in the calculation or mitigation of damages to pipe systems by electrolysis caused by the rettim current of street-railway systems. For some of these or other reasons we...

Nemi Tin Whisker Test Method Standards

The need to better understand whisker growth has dramatically increased as component suppliers convert from tin-lead (SnPb) finishes to Pb-free finishes of Sn and low-alloy-content Sn-based finishes. Whiskers are spontaneous growth of metal filaments emanating from the finish surface. The issues with whiskers are they may grow long enough to cause short circuiting or break off and interfere wit...

Selecting parental materials for hybridization by measuring genetic diversity

Patching repair with ECC on cracked concrete surface

Performance requirements of the patch repair material are strength, size stability, shieldability, durability, bond property with the substrate concrete, ductility and so forth. Various kinds of patch repair materials with short fibers have been developed and used. Engineered Cementitious Composites (ECC) which provides multiple cracking and strain hardening behavior is also one of the attracti...

One-step method for measuring the effect of humidity on powder resistivity

Relation between powder resistivity and humidity is typically measured in several steps. When a standard resistivity cell is used, this procedure may take weeks. We present a method for measuring powder resistivity as a function of moisture using a one-step process. System consisted of two parallel electrodes immersed in powder. High voltage electrode was a uniform square but the ground electro...