Volume Deformation and Hydraulic Conductivity Behavior of Sand-Bentonite Mixtures with Fiberglass Additives Under High Temperatures

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Abstract The performance of energy geo-structures is also dependent on the surrounding soil properties in the presence of high temperatures or thermal cycles. Change in temperature may affect many engineering parameters of soils. Sand-bentonite mixtures or bentonite which are used as a buffer should keep their performance at design level for a long time. Purpose: In order to improve engineering behavior of soils under high temperatures thermally durable materials can be used. Volume deformation and hydraulic conductivity behavior of 30% bentonite-70% sand mixtures in the presence of fiberglass additives were investigated. Methods: Consolidation tests were performed at both room and high temperatures (80 °C), hydraulic conductivity tests were started at room temperature and temperature cycle (25-50-80°C) was applied. Results:Fiberglass increased the amount of compression insignificantly under room temperature, whereas the total compression amount increased remarkably under high temperature. On the other hand, the hydraulic conductivity increased under high temperature with fiberglass additive. Conclusions: Fiberglass added sand-bentonite mixtures can be used around energy structures as an alternative buffer material with high temperature resistance.