Abstract
To improve the thermal performance of external masonry walls, a new tenon composite block is proposed as the external maintenance component which contains the internal hollow concrete block part, the external block part, and the extruded polystyrene layer fixed by tenons. The production process and concrete material mixing ratio were optimized for the new tenon composite block to promote its application. The mechanical strength and thermal properties of the optimized tenon composite blocks were tested with experiments and numerical simulation in this study. The testing and simulation results indicated that after utilizing the two optimized concrete mixing ratios, the tenon composite block strength matched the strength requirements according to the related design code. The thermal performance of the tenon composite block wall was also good compared with that of a common block wall.
Highlights
Large amount of energy consumption and CO2 emissions have caused serious environmental damage in recent years due to rapid urbanization
Some relevant statistical data indicated that within the service age of buildings, the heat loss through external protection or structure components accounts for 70%–80% of the total heat loss [3], and the heat loss through external walls accounts for approximately 25% and 35% of the total heat loss during winter and summer, respectively [6, 7]. us, improving the thermal performance of building external walls is the key to reduce energy consumption in building service age
The application of polystyrene, when used as polystyrene layer integrated in building walls, may cause unreliable connecting between thermal insulation layer with the main block or wall part and reduce the service age. e application of metal fasteners including steel bars was able to fix the polystyrene thermal insulation layer, but heat bridge caused by steel bars was very serious and reduced the total thermal performance [14,15,16]
Summary
Large amount of energy consumption and CO2 emissions have caused serious environmental damage in recent years due to rapid urbanization. Us, improving the thermal performance of building external walls is the key to reduce energy consumption in building service age. Us, recently, new thermal insulation wall materials are playing key role in improving the thermal performance of external walls and realising green energy conservation in buildings. The application of polystyrene, when used as polystyrene layer integrated in building walls, may cause unreliable connecting between thermal insulation layer with the main block or wall part and reduce the service age. The thermal performance and mechanical performance are still limited and need to be balanced in application when using polystyrene material in new hollow blocks.
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