| With the rapid development of Chinese economy, energy issues have become increasingly prominent, and energy conservation has become the key to achieving sustainable development. Chinese construction industry has ushereded the peak of the development since 2008, too many high-energy buildings will make building energy consumption exceed the transportation, industry and other sectors, and will occupy the primacy of social energy consumption ultimately, reaching about 30% or so. The poor thermal performance of building envelope is the main reason of building high-energy consumption, thus improving thermal performance of the building envelope is the main way to solve the high-energy consumption of buildings. As the new wall materials, sintering insulation hollow blocks are provided with excellent fireproofing properties, equal life with buildings, good insulation properties and so on, is ideal for new wall insulation materials.In this paper, the impact of adding pore-forming agents on material thermal performance is explored by studying the performance of sintering insulation hollow block in laboratory. Sintering insulation hollow puzzle blocks with 29 rows of holes and pore-forming agents is jointed through the conclusions reached by laboratory, the feasibility of its application to building energy-saving is analyzed according to the mechanical and thermal performance of the actual products, and finally make the products applied to the demonstrating buildings successfully, meeting the standards of building energy-saving.Firstly, by analyzing the physical and chemical properties of raw materials and pore-forming agents, the results show that the chemical and mineral composition of Xinjiang shale is suitable for sintering insulation hollow blocks. The firing temperature range of shale is 850 ~ 1050 ℃, 950 ℃ is the best firing temperature; Sawdust and sludge with large LOI, respectively, 98% and 50%,is suitable for being used as a pore-forming agent. Secondly, the shale adding different proportions of pore-forming agents are used to product sintered insulation hollow blocks, by testing their compressive strength, porosity, bulk density and thermal performance, the results show that the pore-forming agents content has significant impact on the performance of the products. With the increase of the pore-forming agents content, the apparent porosity, drying shrinkage and firing shrinkage, loss on ignition of the sample increases and the bulk density, compressive strength decreases.Thermal conductivity of the sample is 0.1901W/(m·k)that fall 57.87% related to pure shale products when the addition of sawdust is 6%.Under the premise of ensuring the thermal insulation properties of materials, thermal conductivity of the sample is 0.2031W/(m·k)that fall 54.99% related to pure shale products when the addition of sludge is 15%. Under the premise of ensuring the strength of materials, the addition of pore-forming agents of sludge can significantly enhance the thermal insulation properties of the materials.After considering the performance of the two pore-forming agents synthetically, sawdust is preferably chosen as a pre-plant test pore-forming agent. Firstly, the production processes of the production line is adjusted preferably to increase production efficiency and capacity, according to the actual production of the production lines. Secondly, by sintering insulation hollow puzzle blocks with 29 rows of holes and sawdust, and testing their mechanical properties, thermal performance of blocks and masonry, results show that the compressive strength of sintering insulation hollow puzzle blocks with 29 rows of holes and sawdust reaches MU10, in line with national standards; the heat transfer coefficient of blocks is 0.447W/(m2·K)that is much lower than the solid brick with the same specifications; the heat transfer coefficient of masonry is 0.35W/(m2·K)that falls 66.35% related to pure shales products and falls 27.08% related to solid brick wall with 6% sawdust and shale, in line with the requirements of building energy efficiency cold and cold regions. Finally, sintered insulation hollow puzzle blocks with 29 rows of holes and sawdust is applied to demonstrating buildings in cold regions successfully, realizing the request of a single material to meet building energy efficiency. |
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