Freeze–thaw durability of cement-based geothermal grouting materials

摘要: Abstract The required vertical closed loop geothermal heat exchanger size highly depends on the peak demand of building when no complementary source is included. If grouting materials were able to resist freezing temperatures, a mean-demand designed would be sufficient fulfill energy requirements building, either preventing oversizing or necessity an hybrid system and therefore saving their associated cost. This paper analyzes freeze–thaw durability five cement based mortars. One was neat (N) rest contained limestone sand (L), silica (S), electric arc furnace slag (EAF) Construction demolition waste (CDW). Mortars exposed up 25 cycles continuous water curing analyze influence both treatments volumetric content, flexural, compressive pipe mortar adherence loads thermal conductivity resulting Results show significant damage due applied all mortars but cement, probably non-saturation core probes. Although presented flexural resistance probes severely damaged, observed material, denoting that any loss efficiency must increment contact between grout creation new resistances in fractures itself.