Hygric, thermal and durability properties of autoclaved aerated concrete

Jerman, Miloš; Keppert, Martin; Výborný, Jaroslav; Černý, Robert

doi:10.1016/j.conbuildmat.2012.12.036

Cited by 198 publications

(67 citation statements)

References 31 publications

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“…The experimental results show that the pore size distribution of all AACs are quite different; the pore size distribution of Japanese AAC (JP) is bimodal, whereas all Vietnamese AACs show single peak. The bimodal pore size distribution of AAC has also been reported by Mitsuda et al (1992), Kreft et al (2011), andJerman et al (2013), while the pore size distribution with single peak was reported by Chen et al (2017).…”

Section: Mineralogical Component Of Aacssupporting

confidence: 64%

Microstructure and Shrinkage Behavior of Autoclaved Aerated Con-crete(AAC) -Comparison of Vietnamese and Japanese AACs-

Lam

Asamoto

Matsui

2018

ACT

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We investigated the microstructure and shrinkage behavior of autoclaved aerated concrete (AAC) from several manufacturers in Vietnam comparing with Japanese AAC. Three types of Vietnamese AAC and one type of Japanese AAC were used for powder X-ray diffraction, scanning electron microscopy, mercury intrusion porosimetry, and shrinkage tests. The experimental results show that the main hydration products of AAC that used fly ash as silica materials is semi-crystalline calcium silicate hydrate, while the ones of others are tobermorite; but the tobermorite crystals of AACs from some manufacturers in Vietnam are disordered structures and lack of interlocking among tobermorite crystals. The pore size distribution of all Vietnamese AAC are single peak, whereas Japanese AAC is bimodal. The pore distribution characteristics of AACs significantly influenced their shrinkage behavior and the shrinkage of Vietnamese AAC is higher than that of Japanese AAC at intermediate relative humidity (RH). The capillary tension is the principle shrinkage mechanism for AAC materials at high RH (above about 65%) to cause local minimum shrinkage of Japanese AAC at high RHs, while the change in surface free energy is dominant at low RH conditions.

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Section: Mineralogical Component Of Aacssupporting

confidence: 64%

Microstructure and Shrinkage Behavior of Autoclaved Aerated Con-crete(AAC) -Comparison of Vietnamese and Japanese AACs-

Lam

Asamoto

Matsui

2018

ACT

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“…Carmeliet et al [8] reported a reduction of 5 to 13% when the moisture content was doubled for brick and calcium silicate respectively. Jerman et al [9] reported a rate variation of water vapour permeability of 0.13 10 -6 m 2 /s for each 1% of change in RH for an aerated concrete with a water vapour permeability (dry cup) of 2.17·10 -6 m 2 /s. Finally, heat capacity significantly increases with moisture content due to the high specific heat capacity of water [4].…”

Section: Introductionmentioning

confidence: 99%

Determination of hygrothermal parameters of experimental and commercial bio-based insulation materials

Palumbo

Palacio

Holcroft

et al. 2016

Construction and Building Materials

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The development and application of bio-based insulation materials can contribute to the minimization of the environmental impacts of buildings through reduction of embodied and in-use energy demand, in addition to many other major impacts such as resource depletion and waste generation. The hygrothermal performance of natural building materials has direct and indirect impacts on moderating indoor environmental conditions and can contribute to energy savings provided that such aspects are taken into account during the design and construction phases. This requires in-depth knowledge of the thermal and hygroscopic properties of the materials and their dependence on the moisture content. In this paper, the hygrothermal properties of six insulation materials is determined; four are commercially available materials while the other two are experimental materials based on crop byproducts and natural binders. The influence of relative humidity on such properties is analysed.Moreover, the experimental Moisture Buffer Values are obtained for the six insulations, according to the protocol of the standard ISO 24353. Finally, a mass and heat coupled model is numerically solved to simulate this protocol for two of the materials, obtaining a good agreement with the experimental results.

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“…Moisture is the key feature that determines strength, shrinkage, carbonation and thermal conductivity [3]. Particularly unfavorable is the effect of humidity on compressive strength and coefficient of thermal conductivity λ [4][5][6]. Authors [7] describe the problem of determining the coefficient of thermal conductivity under various humidity conditions, based on the standard ISO 10456 [8] and experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Influence of addition of calcium sulfate dihydrate on drying of autoclaved aerated concrete

Małaszkiewicz

Chojnowski

2017

Open Engineering

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The quality of the autoclaved aerated concrete (AAC) strongly depends on the chemical composition of the raw materials, as well as on the process of the hydrothermal reaction during autoclaving. Performance parameters depend on material structure: fine micron-scale matrix porosity generated by the packing of thin tobermorite plates and coarse aeration pores arising from the foaming of wet mix. In this study the binder varied in calcium sulfate dihydrate (CaSO 4 ·2H 2 O) content. Five series of AAC specimens were produced, with gypsum content 0; 0.55; 1.15; 2.3 and 3.5% of dry mass respectively. AAC units were produced in UNIPOL technology. The study presents experimental results of AAC moisture stabilization. The initial moisture content was determined directly after autoclaving. Slower drying process was observed for samples containing over 2% of gypsum. Whereas other performance parameters, compressive and tensile strength, as well as water absorption and capillary rise, were significantly better comparing to the reference AAC samples.

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Hygric, thermal and durability properties of autoclaved aerated concrete

Cited by 198 publications

References 31 publications

Microstructure and Shrinkage Behavior of Autoclaved Aerated Con-crete(AAC) -Comparison of Vietnamese and Japanese AACs-

Microstructure and Shrinkage Behavior of Autoclaved Aerated Con-crete(AAC) -Comparison of Vietnamese and Japanese AACs-

Determination of hygrothermal parameters of experimental and commercial bio-based insulation materials

Influence of addition of calcium sulfate dihydrate on drying of autoclaved aerated concrete

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