Reliability analysis of geogrid creep data in Japan

The data collected by creep testing carried out in conformity with current Japanese practice and reported in Public Works Research Center product certification reports are interpreted in order to identify and discuss differences between current Japanese practice and European and US practices. A database of 66 different geogrid products from 10 different manufacturers was reviewed comprising of 362 different constant load creep tests. An important outcome from the analysis of the creep test data collected to date is a strong case for the adoption of elevated temperature testing in order to eliminate the excessively long extrapolation times required to compute creep strength reduction factors.