scholarly journals Evaluation of Non-Autoclaved Aerated Concrete for Energy Behaviors of a Residential House in Nur-Sultan, Kazakhstan

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 610
Author(s):  
Chang-Seon Shon ◽  
Inzhu Mukangali ◽  
Dichuan Zhang ◽  
Anuar Ulykbanov ◽  
Jong Kim
Keyword(s):  
Thermal Conductivity ◽  
Heat Loss ◽  
Construction Material ◽  
Energy Performance ◽  
Phase Iii ◽  
Normal Concrete ◽  
Autoclaved Aerated Concrete ◽  
Energy Behavior ◽  
Residential House ◽  
Aerated Concrete

Autoclaved aerated concrete (AAC) is commonly used as a modern, energy-efficient construction material in Nur-Sultan, Kazakhstan—the second-coldest national capital in the world after Ulaanbaatar, Mongolia. The autoclave curing method used to manufacture the AAC has potential risks and is environmentally costly because of its high-pressure and -temperature operation. Therefore, for phase I and II studies, non-autoclaved aerated concrete (NAAC) was cast, and its properties were evaluated in terms of compressive strength, density, porosity, and thermal conductivity. Moreover, the thermal conductivity prediction model of NAAC was successfully developed. In this Phase III study, the energy behavior of the NAAC was evaluated by energy simulation for a typical two-story residential house model in Kazakhstan. Different wall materials, such as fired brick and normal concrete, were adapted to compare the energy performance of NAAC. Finally, the annual heat loss and amount of heat transferred through the wall of the house were calculated to cross-check the energy-saving effect of NAAC. It was found that the NAAC conserved energy, because the heating and cooling loads, annual heat loss, and amount of heat transfer of NACC were lower than those of fired brick and normal concrete.

Measuring the Thermo-Technical Parameters of Autoclaved Aerated Concrete

2016 ◽  
Vol 824 ◽  
pp. 100-107 ◽  
Author(s):  
Alena Struhárová
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
Physical Properties ◽  
Bulk Density ◽  
Capillary Absorption ◽  
Measuring Device ◽  
Technical Parameters ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Technical Properties

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.

Performance-based model to predict thermal conductivity of non-autoclaved aerated concrete through linearization approach

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

Effect Bonding Strength Steel Reinforcement with Epoxy Coating on the Character Destruction of Autoclaved Aerated Concrete Beams in Bending

2019 ◽  
Vol 974 ◽  
pp. 665-671
Author(s):  
Omar Ismael Alhashimi ◽  
AL-Hasnawi Yasser Sami Ghareb
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Shear Failure ◽  
Lightweight Concrete ◽  
Construction Material ◽  
Reinforced Concrete Beam ◽  
Reinforcing Steel ◽  
Deep Beams ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete

Many of the complex reinforced Autoclaved Aerated Concrete characteristics under shear and flexure are yet to be identified to employ this material advantageously and economically, as it has many advantages of low weight, fire resistance, acoustic and thermal insulation. It is observed in the article that under two-points loading system, diagonal cracks are usually the first cracks to be observed in the deep beam clear span. The diagonal cracks first are developed in relatively deep beams and the flexural cracks are first developed in shallower beam. The principal mode of failure in the deep beams having adequate reinforcement is diagonal tension cracking. The shear failure is a common type for all beams. This indicates a weak the bond strength between lightweight concrete and reinforcing steel. There are many factors affecting the bond strength between the lightweight concrete and reinforcing steel, where the compressive strength plays an important role in bond strength, and the bond strength is increased by increasing the compressive strength. The AAC beams have the potential to be an excellently energy-saving construction material and is believed to emerge as an alternative to traditional reinforced concrete beam in the near future. This is proved by the experimental analysis.

scholarly journals Fundamental Properties and Thermal Transferability of Masonry Built by Autoclaved Aerated Concrete Self-Insulation Blocks

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1680 ◽  
Author(s):  
Fenglan Li ◽  
Gonglian Chen ◽  
Yunyun Zhang ◽  
Yongchang Hao ◽  
Zhengkai Si
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Shear Strength ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Residential Buildings ◽  
Fundamental Properties ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Insulation Block

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.

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
Keyword(s):  
Thermal Conductivity ◽  
Energy Loss ◽  
Thermal Insulation ◽  
National Standard ◽  
Cold Regions ◽  
Autoclaved Aerated Concrete ◽  
The North ◽  
Aerated Concrete ◽  
The Difference ◽  
Masonry Mortar

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.

scholarly journals AERATED CONCRETE AS AN ENERGY-EFFICIENT MATERIAL FOR WALLS

2020 ◽  
pp. 59-67
Author(s):  
M.V. Zavoloka ◽  
◽  
Yu.M. Zavoloka ◽  
І.І. Grynyova ◽  
Yu.V. Zavoloka ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
Thermal Resistance ◽  
Energy Saving ◽  
Energy Efficient ◽  
Operating Conditions ◽  
Wall Material ◽  
Autoclaved Aerated Concrete ◽  
Technical Requirements ◽  
Aerated Concrete

Abstract. In the context of tightening the thermo-technical requirements for building envelopes, the benefits and advantages of energy-efficient wall material of autoclaved aerated concrete and aerated concrete products are shown. Domestic and foreign researches in the field of rational use of autoclaved aerated concrete for external walls in modern construction of energy-efficient buildings and optimization of structural solutions of aerated concrete walls are generalized. The most important thermos-physical characteristic for assessing the thermal resistance of external walls made of aerated concrete is the value of the thermal conductivity coefficient. The moisture content of aerated concrete has a significant effect on thermal conductivity, the release moisture is several times higher than the calculated moisture content stipulated by the standards for construction heat engineering and operating conditions. In the initial stages of construction, the moisture content of aerated concrete exceeds the moisture content established in the normative documentation by operating conditions, which requires recalculation of the thermal resistance of the walls of buildings taking into account the real moisture content of aerated concrete used during construction. A detailed explanation of the dependence of the heat flow through the enclosing structure on its resistance to heat transfer, established in the form of a hyperbola, is given, and the dependence of the difference in thermal conductivity on the moisture content of aerated concrete blocks is presented. When analyzing the effect of moisture on the thermal conductivity of aerated concrete, was used the characteristic deviation ± Δλ of thermal conductivity of aerated concrete in a wet state from the thermal conductivity of concrete in a dry state was used. Based on the results of the experiment carried out at OSACEA, the main conclusions and recommendations for determining the coefficient of thermal conductivity of aerated concrete in dry and wet conditions are given. Some aspects of energy saving in construction practice are presented, based on materials prepared by Doctor of Technical Sciences, prof. Gagarin V.G. The need to improve specific energy-saving measures is shown, which should be economically viable and not reduce the durability of construction objects. Generalized conclusions and recommendations are given.

Effect of Equilibrium Moisture Contents on Insulating Performance of Autoclaved Aerated Concrete Blocks

2011 ◽  
Vol 216 ◽  
pp. 479-484 ◽  
Author(s):  
Xue Li Jin ◽  
Xiang Yu Luo ◽  
Qing Lin Meng
Keyword(s):  
Thermal Conductivity ◽  
Pearl River Delta ◽  
River Delta ◽  
Pearl River ◽  
Correction Coefficient ◽  
Pearl River Delta Region ◽  
Delta Region ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
The Pearl River

In this paper, a research was performed which considers the material characteristics of autoclaved aerated concrete (AAC) blocks and the weather characteristics in Pearl River Delta region. The AAC blocks laws of absorption and desorption and its thermal conductivity under different equilibrium moistures were measured. The experimental results show that equilibrium moisture content (EMC)is 6.27% for AAC blocks with a B07 density in hot and humid areas in the Pearl River Delta region including the city of Guangzhou, and the correction coefficient of the thermal conductivity is 1.5.

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