Abstract
This paper performed a detailed study on the fundamental properties and thermal conductivity of autoclaved aerated concrete (AAC) self-insulation block, and the mechanical properties and heat transfer resistance of the AAC self-insulation block masonry. Different kinds of joints and the plastering surface were used to build the masonry specimens. The distinctive feature of the blocks and mortars is the lower thermal conductivity with expected strength. Compared to those with larger thickness of insulation mortar joints, the masonry with thin-layer mortar joints had better compressive performance and lower shear strength. The compressive strength of masonry was related with the block and mortar strengths, the shear strength of masonry along mortar joints was related with the mortar strength. The stress–strain relationship of masonry in compression could be predicted by the similar expression of conventional block masonry. The tested heat transfer coefficient of AAC self-insulation block masonry with thickness of 250 mm without plastering surfaces was (0.558 ± 0.003) W/(m2·K). With the plastering surfaces, the heat transfer coefficient reduced by 4.4% to 8.9%. Good agreements in values of heat transfer coefficient existed by using the test, theoretical computation and ANSYS (ANSYS Inc. Canonsburg, PA, USA) analytical methods. Based on the extensibility analyses, the heat transfer coefficients of AAC self-insultation block masonry with different thickness are proposed. The best thickness is proposed for the outer walls of residential buildings in different cold zone to meet the design requirement of energy conservation.
Highlights
In the past century, research and production technology of autoclaved aerated concrete (AAC)have been constantly developed
With rational compressive stress–strain relationship, the AAC self-insulation block masonry has compressive strength relied on the strengths of block and mortar, and the shear strength along mortar joints relied on the mortar strength
The superior products of the AAC self-insulation block were prepared with the compressive strength of 4.0 MPa and the dry density of 558 kg/m3
Summary
Research and production technology of autoclaved aerated concrete (AAC)have been constantly developed. Research and production technology of autoclaved aerated concrete (AAC). With the feature of integrated performance in thermal insulation, fireproofing and durability, AAC becomes a green lightweight building material [1,2,3]. A variety of important researches on AAC have performed to investigate the composition and microstructures affected by the constituent materials, quartz particle size, autoclaving. The basic performances including density, water absorption, strength, drying shrinkage, freeze–thaw resistance as well as the thermal insulation properties were studied [1,3,7,8,9,10,11,12,13,14,15]. AAC is commonly produced through molding and autoclaved aeration process of constituent materials including cement, lime, sand, water and aluminum powder
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