Study on autoclaved aerated concrete: Review

Kalpana, M.; Mohith, S.

doi:10.1016/j.matpr.2019.11.099

Cited by 47 publications

(27 citation statements)

References 3 publications

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“…Its preference stems from particularly advantageous thermal insulation properties and lightweight construction principles. Currently, its expansion is also extensive in regions of Asia and especially China [22], which operates several hundred production plants [23]. This proves that it is of interest all around the world.…”

Section: Introductionmentioning

confidence: 99%

Reliability Study of Equilibrium Moisture Content Methods for Sorption/Desorption Isotherms Determination of Autoclaved Aerated Concrete

Slávik¹,

Struhařová

Čekon

2021

Applied Sciences

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Autoclaved aerated concrete (AAC) and its hygric parameters are a highly important issue in the field of building physics. There are several methods currently available to determine the equilibrium moisture content of building materials. Beside the conventional ones, new methods are constantly being introduced. This study explores the sorption/desorption properties of of three types of commercially produced AACs with three different bulk densities and demonstrates the application of the relevant methods available to characterize these parameters. The reliable characterization of the studied material was done through the conventional static approach, using the desiccator and an environmental chamber, and a new automated method of dynamic vapor sorption is implemented. The goal is to compare and identify the reliability of all methods used with respect to the efficiency of the data measurement process. Sound consistency between the results of the conventional methods and the experimental data obtained indicates the dynamic vapor sorption technique is highly reliable when measuring the equilibrium moisture content—particularly exemplified during the AAC sample testing. Therefore, the methodology developed in this study is expected to provide the reference for measuring the sorption/desorption isotherms of building materials with both static and automated techniques.

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Section: Introductionmentioning

confidence: 99%

Reliability Study of Equilibrium Moisture Content Methods for Sorption/Desorption Isotherms Determination of Autoclaved Aerated Concrete

Slávik¹,

Struhařová

Čekon

2021

Applied Sciences

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“…In recent years, autoclaved aerated concrete (AAC) has been commonly used as construction material by virtue of its functional performance [1][2][3][4][5][6], in particular, thermal insulation and energy efficiency [7][8][9]. AAC comprised of cement, fly ash, lime and finegrained aggregates has been produced in Asia, Europe and Americas since it once turned into creation in Sweden in 1930s [10]. However, its excellent thermal and sound insulation properties are shadowed when considering of high water absorption.…”

Section: Introductionmentioning

confidence: 99%

Study on Water Absorptivity and Frost Resistance Performance of Self-ignition Coal Gangue Autoclaved Aerated Concrete

Cong

Tan

Lü

et al. 2021

Preprint

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Self-ignition coal gangue (SCG) used as one of precursors to fabricate aerated autoclaved concrete (AAC). Aiming at studying water absorptivity and frost resistance performance of self-ignition coal gangue aerated autoclaved concrete (SCGAAC), three-period water absorbing tests and freezing-thawing tests were carried out and the corresponding results were recorded and analyzed. In order to modify the water absorptivity of SCGAAC, foam stabilizer was applied to adjust pore structure while calcium stearate was expected to change hydrophilic feature of CG. It was demonstrated that the compressive strength of SCGAAC containing foam stabilizer or calcium stearate declined at different levels, although the porosity became lower slightly. For water absorptivity, foam stabilizer failed to decrease the water content at any period and even increased water absorbing rates. Calcium stearate controlled water absorbing rate successfully but the ultimate water content hardly reduced. All of the SCGAAC samples exhibited intact appearance after 50 freezing-thawing cycles and showed excellent frost resistance performance. Three models were proposed to predict water absorptivity and frost resistance performance of SCGAAC and the corresponding prediction results matched test resulted well.

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“…Gas-liberating agents are recommended to obtain the expansive cement pastes used in the filling of ducts in post-tensioned prestressed concrete, injection preparations, and in repair mortars and mortars for anchoring. Gas-liberating agents (mainly aluminum powder) are also used for the production of aerated concrete [ 9 , 10 , 11 ] and porous geopolymers [ 12 , 13 , 14 ]. The expanding effect of aluminum, zinc and silicon comes from the reaction of these elements with Ca(OH) 2 created during cement setting.…”

Section: Introductionmentioning

confidence: 99%

“…The most commonly used gas-liberating agent in concrete is aluminium powder. Hydrogen released in the reaction of aluminum with calcium hydroxide causes the formation of pores in the size range of 0.1–1.0 mm in the concrete [ 9 ], which results in an increase in the porosity of the concrete [ 9 , 10 , 17 , 18 , 19 ]. However, no significant changes in the content of micropores smaller than 1 µm due to the action of aluminum powder were reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Type of Cement on the Action of the Admixture Containing Aluminum Powder

et al. 2021

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The study of the effect of cement type on the action of an admixture increasing the volume of concrete (containing aluminum powder), used in amounts of 0.5–1.5% of cement mass, was presented. The tests were carried out on cement mortars with Portland (CEM I) and ground granulated blast-furnace slag cement (CEM III). The following tests were carried out for the tested mortars: the air content in fresh mortars, compressive strength, flexural strength, increase in mortar volume, bulk density, pore structure evaluation (by the computer image analysis method) and changes in the concentration of OH− ions during the hydration of used cements. Differences in the action of the tested admixture depending on the cement used were found. To induce the expansion of CEM III mortars, a smaller amount of admixture is required than in the case of CEM I cement. Using the admixture in amounts above 1% of the cement mass causes cracks of mortars with CEM III cement due to slow hydrogen evolution, which occurs after mortar plasticity is lost. The use of an aluminum-containing admixture reduces the strength properties of the cement mortars, the effect being stronger in the case of CEM III cement. The influence of the sample molding time on the admixture action was also found.

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Study on autoclaved aerated concrete: Review

Cited by 47 publications

References 3 publications

Reliability Study of Equilibrium Moisture Content Methods for Sorption/Desorption Isotherms Determination of Autoclaved Aerated Concrete

Reliability Study of Equilibrium Moisture Content Methods for Sorption/Desorption Isotherms Determination of Autoclaved Aerated Concrete

Study on Water Absorptivity and Frost Resistance Performance of Self-ignition Coal Gangue Autoclaved Aerated Concrete

Influence of the Type of Cement on the Action of the Admixture Containing Aluminum Powder

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