ISO/DIS 24012-1:2026

This document specifies the test devices, test procedures,data analysis, test report,quality control of swelling pressure test for buffer material under coupled thermo-hydro-mechanical conditions for the geological disposal of high-level radioactive waste. This is one of three key tests of buffer material under these conditions. Specifically, the test temperature range of those tests is from room temperature to 90 ?, because the buffer material will experience such temperature conditions during early disposal process. This document is Part 1 of a three-part series comprising the following: Part 1 – Swelling pressure test Part 2 – Hydraulic conductivity test Part 3 – Triaxial compression strength test The series is applicable to the whole process of testing of buffer material under coupled thermo-hydro-mechanical conditions for geological disposal of high-level radioactive waste. This document is applicable to the swelling pressure test specifically.