Structural Thermal Break Systems for Buildings: Heat Transfer Characteristics of Lightweight Structural Concrete Walls: Final Report

摘要

A lightweight structural concrete was developed for use in exterior walls of low-rise residential and commercial buildings. The lightweight concrete has a unit weight of 50 pcf (800 kg/m sup 3 ), a compressive strength of 2000 psi (13.8 MPa) and a thermal conductivity of 1.6 Btu/center dot/in./hr/center dot/ft sup 2 /center dot//degree/F (0.23 W/m/center dot/K). Lightweight concretes have not been previously developed with this combination of low density and moderate compressive strength. The portland cement concrete developed for this project can be used to combine structural, thermal insulation, and heat storage capacity functions of exterior walls in one element. For many climates this concrete can be used without additional insulation as a complete wall system in low-rise buildings. 23 refs., 54 figs., 19 tabs. (ERA citation 14:019741)