Investigation of shear strength of sand–bentonite mixtures with boron additives at high temperature for energy geo-structures

The soils surrounding energy geo-structures are exposed to high temperatures and temperature cycles. Changes in the engineering properties of should be investigated under thermal effects that highly durable against changes needed for thermo-active geo-structures. Generally, bentonite or sand–bentonite mixtures (SBMs) preferred as natural barrier soil materials. Hence, these materials improved. Boron, which has resistivity, reduces heat expansion materials, when added may increase durability buffer at temperatures. In present study, tincal ulexite additives were observed on shear strength behavior SBMs 80 °C room temperature. general results showed with contribution boron, increased increasing effect was more pronounced 20% Tincal can used