Study on Special Thermal-Insulation Masonry Mortar for the North Cold Regions Autoclaved Aerated Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 1498-1501
Author(s):  
Li Guang Xiao ◽  
Rui Bo Li ◽  
Cun You Yan ◽  
Guan Jie Li

Because the difference between the autoclaved aerated concrete and ordinary masonry mortar with thermal conductivity is too large, also easy to cause the bricking-up appearance the cold bridge and even the phenomenon of condensation, the author have study special thermal-insulation masonry mortar for autoclaved aerated concrete, about solving between the aerated concrete and ordinary mortar problem filling cracks, it is more important to resolve the big difference between the thermal conductivity, improving the insulation properties of aerated concrete special mortar. The performance as per special masonry mortar and plaster mortar for autoclaved aerated concrete (China national standard JC890-2001), supporting thermal-insulation masonry mortar effectively improved the cold bridge phenomenon of energy loss occurs.

2015 ◽  
Vol 768 ◽  
pp. 369-374
Author(s):  
Su Gai Cao ◽  
Pei Xin Li ◽  
Feng Qing Zhao ◽  
Zhi Guo Zhang

In this paper, ecotype cementing materials (with steel slag, mineral slag etc. as the main raw materials), waste aerated concrete, regeneration light sand and etc. were used as the main materials to prepare thermal insulation masonry mortar. Then the impacts of materials on the mortar’s performances such as strength, density and thermal conductivity were analyzed. At last, it obtained the optimal mixture ratio to prepare thermal insulation masonry mortar with a strength degree of M5. This kind of mortar used a lot of solid wastes as raw materials but with many advantages such as light weight, low thermal conductivity and low cost, all of this made it became a new environmental friendly thermal insulation masonry mortar.


2016 ◽  
Vol 824 ◽  
pp. 100-107 ◽  
Author(s):  
Alena Struhárová

Bulk density and moisture content are factors that significantly affect the physical properties of autoclaved aerated concrete (AAC) including thermal conductivity and other thermo-technical characteristics. This article shows the results of measurements of compressive strength, capillary absorption, water absorption and porosity of AAC (ash on fluidized fly ash) at different bulk density and also the results of thermal conductivity of AAC at different bulk density and variable moisture content of the material. The thermo-technical properties were measured using the Isomet 2104, a portable measuring device. Acquired results demonstrate dependence of physical properties including thermal conductivity of AAC on bulk density and moisture content. The reliability and accuracy of the method of measuring was also shown.


2019 ◽  
Vol 196 ◽  
pp. 555-563 ◽  
Author(s):  
Anuar Ulykbanov ◽  
Eldar Sharafutdinov ◽  
Chul-Woo Chung ◽  
Dichuan Zhang ◽  
Chang-Seon Shon

2017 ◽  
Vol 7 (1) ◽  
pp. 157-161 ◽  
Author(s):  
Пастори ◽  
Zoltan Pastori ◽  
Мохачине ◽  
Il'diko Mohachine ◽  
Горбачева ◽  
...  

The problem of industrial use of tree bark is relevant and has practical importance for complex processing of wood raw material. Barks are available in Hungary and Russia in large quantities, but they are not widely used for different purposes than producing energy. One of the perspective areas of utilization of tree bark is its use as raw material for the production of thermal insulation panels. The present study focuses on the thermal insulation capacity of tree bark. Thermal conductivity properties of two broadleaved (black locust (Robinia pseudoacacia), pannónia poplar (Populus euramericana cv. Pannónia)) and three coniferous (larch (Larix decidua), spruce (Picea abies) and scots pine (Pinus silvestris)) tree species were examined. Based on these results, the scopes of the tested species were further narrowed, while the best results showing black locust was used for pressed insulation panel. Three different fractions were produced made of grained black locust bark. Furthermore, the heat insulation capacities of bark were investigated by compressing the chipped bark particles until the lowest heat conductivity was reached. Results show a competitive thermal insulation property to the traditionally used insulation materials, the value was 0.0613 W/mK reached by black locust bark chips. The broadleaved tree bark chips have a lower thermal conductivity than coniferous species. By using fine, mid, and coarse fraction of black locust bark were produced and the difference of thermal conductivity between them was negligible. Although the fine fractionated black locust bark chip thermal conductivity was 0.042 W/mK.


Author(s):  
Jonathan Reid

This study was conducted in order to determine various groups’ accuracy in identifying three major standard English accents. The main purpose of the experiment that was performed was to determine how well speakers familiar with these accents could tell them apart from other accents. It focused on comparing the test subjects’ recognition of Canadian English pronunciation with General American pronunciations. Received Pronunciation was used as a control as it is generally considered to differ much more from the standard North American varieties than they differ from one another.Within North America, the 'standard' accents of Canada and the US are quite similar. So similar, that one of the experiment’s hypotheses is that that despite being identified by linguists as different, many native speakers of the two dialects would have difficulty telling the difference themselves. The differences in the features of Canadian English (CE) and General American (GA) have been identified and studied by linguists before, but what this experiment sought to determine was the degree to which speakers of these dialects could tell them apart purely through listening.Canada is given some degree of stigma from the United States for its dialect, and has had fun poked at it for such Canadianisms as the use of 'eh?' and Canadian Raising- Americans will exaggerate the difference when illustrating it, saying “aboot” [ə'but] for about [əˈbʌʊt]. But how well can they perceive the difference when not already informed about the speaker's origins?An online survey was prepared, with audio clips or words in isolation and sentences, spoken by speakers of GA, CE, and RP, specifically using words that exhibited features that vary between the accents. This allowed us to examine subjects’ degree of recognition with, and without prosody, and to analyze the degree to which prosody affects accent recognition. In order to better determine how prior exposure influences accent recognition, the subjects were broken down into three groups: Native speakers of Canadian English, native speakers of American English and ESL speakers who had had prior exposure to Canadian English.One of the main findings of this experiment is that more than 80% of American respondents recognized their own national standard accent, and around 67% recognized the Canadian accent; while only 62% of the Canadian respondents recognized the Canadian accent accurately. Compared to Canadians, Americans were better at telling the North American varieties of spoken English apart.


2015 ◽  
Vol 723 ◽  
pp. 259-265
Author(s):  
Wen Xuan Xu ◽  
Qi Bao ◽  
Zhan Li ◽  
Jun Yu Fan

As a common threat to the public safety, gas explosion and its damage on structures have drawn more and more attention in the academic fields. In this paper, a series of numerical simulations are conducted to study the behavior of autoclaved aerated concrete block infilled walls under gas explosion loading. Firstly, considering the difference between the blocks and the mortar, a refined numerical model is established, and the constitutive model of Brittle Damage in LS-DYNA is hired to describe the material behaviours of both materials. Based on the laboratory material test data, the parameter of the material model are selected reasonably. Then, massive numerical calculation is carried out and the dynamic response of autoclaved aerated concrete block infilled walls is captured and discussed. At last, the anti-blast ability of block infilled walls is compared with that of clay infilled wall of the same thickness. It is found that the anti-blast ability of block infilled walls is weaker than the clay infilled walls for the difference of material density and boundary conditions.


2015 ◽  
Vol 744-746 ◽  
pp. 1398-1401
Author(s):  
Hai Yan Guo ◽  
Jian Bing Ye

Taking a six-story glass bead thermal insulation concrete frame structure building in Kangding, Sichuan as model, to design filler wall composing of fly ash autoclaved aerated concrete block. Utilizing energy dissipation theory analyzes the building energy consumption. Conclusion: The glass bead thermal insulation concrete frame structure of fly ash autoclaved aerated concrete block filler wall meets the requirement of Sichuan residential building energy-saving code.


Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1680 ◽  
Author(s):  
Fenglan Li ◽  
Gonglian Chen ◽  
Yunyun Zhang ◽  
Yongchang Hao ◽  
Zhengkai Si

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.


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