Calculation analysis method to model the creep of recycled aggregate of thermal insulation concrete

Abstract

The application of construction waste and energy-saving materials to buildings has important economic and environmental significance. In order to study the creep characteristics of recycled aggregate of thermal insulation concrete (RATIC), a series of laboratory tests and calculation analysis methods have been carried out. To consider the recycled coarse aggregates (RCAs) and glazed hollow beads (GHBs), a new creep model of recycled aggregate of thermal insulation concrete (RATIC) is put forward herein. The experimental research explored investigated substitution level of 0%, 50% and 100% of RCA and content of 0 kg/3, 65 kg/3 and 130 kg/3 of GHB to support the modification of existent creep models and to explore how the incorporation of GHB affects the creep property and creep developmental tendency of RATIC. The results reveal that 1) GHB can significantly decrease the negative impact of RCA on the concrete creep property, when the substitution level of RCA is 100%, the creep coefficient of RAC can be reduced by 28.9%∼45.4% with the addition of GHB and that 2) the GHB and RCA affect the creep developmental trend in concrete. Eventually, a modified creep model for RATIC was put forward, which accounts for the impacts mentioned above. The model offers an accurate of the creep of RATIC.