Open AccessThermal conductivity and other properties of cementitious grouts
Author(s) -
M.L. Allan
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/656568
Subject(s) - cementitious , grout , shrinkage , materials science , thermal conductivity , durability , cement , composite material , superplasticizer , permeability (electromagnetism) , geotechnical engineering , geology , membrane , biology , genetics
The thermal conductivity and other properties cementitious grouts have been investigated in order to determine suitability of these materials for grouting vertical boreholes used with geothermal heat pumps. The roles of mix variables such as water/cement ratio, sand/cement ratio and superplasticizer dosage were measured. In addition to thermal conductivity, the cementitious grouts were also tested for bleeding, permeability, bond to HDPE pipe, shrinkage, coefficient of thermal expansion, exotherm, durability and environmental impact. This paper summarizes the results for selected grout mixes. Relatively high thermal conductivities were obtained and this leads to reduction in predicted bore length and installation costs. Improvements in shrinkage resistance and bonding were achieved