Carbonation degree of autoclaved aerated concrete

Matsushita, Fumiaki; Aono, Yoshimichi; Shibata, Sumio

doi:10.1016/s0008-8846(00)00424-5

Cited by 82 publications

(41 citation statements)

References 3 publications

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“…The amounts of combined carbon dioxide and calcium oxide were measured to determine the degree of carbonation (Matsushita et al 2000). TG-DTA was used for analysis of the amount of combined carbon dioxide excluding both the amount of adsorbed carbon dioxide gas and carbonated salt other than calcium carbonate.…”

Section: Measurement Of Degree Of Carbonationmentioning

confidence: 99%

Microstructure Changes in Autoclaved Aerated Concrete during Carbonation under Working and Accelerated Conditions

Matsushita

Aono

Shibata

2004

ACT

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The microstructure of AAC changes during carbonation, resulting in degradation such as cracking. AAC panels under working conditions (Field-AAC) aged 5 to 33 years and AAC blocks carbonated under accelerated conditions (Labo-AAC) were subjected to microstructural analysis. The degree of carbonation increased with time and approached 60% both under working and accelerated conditions. Changes of micro-level structures such as surface and crystal structures were more significant under accelerated conditions than under working conditions. Meso-level structures such as the interparticle pore volume were similar regardless of the carbonation conditions. The increase in drying shrinkage was more significant under accelerated conditions than under working conditions because it originated not only from the moisture characteristics but also the micro-level structures.

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Section: Measurement Of Degree Of Carbonationmentioning

confidence: 99%

Microstructure Changes in Autoclaved Aerated Concrete during Carbonation under Working and Accelerated Conditions

Matsushita

Aono

Shibata

2004

ACT

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“…Due to the process of carbonation, the durability of AAC may be affected with increasing time. The binding mineral 11Å-tobermorite reacts with carbon dioxide to silica gel and calcium carbonate according to Equation 1 [4][5][6]. Šauman [7] has already reported in 1971 that tobermorite reacts with CO 2 to calcium carbonate polymorphs, like aragonite, calcite and vaterite, and silica gel.…”

Section: Introductionmentioning

confidence: 99%

Carbonation of autoclaved aerated concrete containing fly ash

2018

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Due to the process of carbonation, the durability of autoclaved aerated concrete (AAC) may be affected. An adequate test method to assess the durability of AAC products in a short period currently does not exist. Hence, the German Institute for Building Technology (DIBt) has defined a limit value for drying shrinkage in order to prevent massive strength decrease of AAC products.In order to understand the deterioration mechanisms more in detail, investigations on the development of the compressive strength and the structural transformation of AAC have been carried out. Specimens taken from two different AAC products on the basis of quartz sand as well as fly ash were stored in different climate conditions. Shrinkage behavior was determined in normal climate (NC) of 20 • C and 45% relative humidity. The compressive strength was determined at the beginning and additionally after about 180, 360, and 540 days. Phase analyses by X-ray diffraction (XRD) were applied to correlate the structural transformation with compressive strength as well as shrinkage behavior in dependence of the silicate-bearing raw materials. K E Y W O R D Sautoclaved aerated concrete, carbonation, fly ash, shrinkage, XRD

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“…(1), where C, C 0 , and C max are the amount of carbon dioxide in the carbonated sample, that in the non-carbonated sample (the initial carbonation ratio in the sample before the carbonation reaction), and the theoretical amount of carbon dioxide required for combination with the total calcium oxide in the sample to form the calcium carbonate, respectively. 13)…”

Section: Methodsmentioning

confidence: 99%

“…accompanied by its hydration reaction. 13) Therefore, the formation of hydrates through the surface modification process of the GGBF-slag indicates that the surface-modified GGBF slag has a surface condition that reacts easily with CO 2 gas. Figure 4 is the schematic diagram of the surface modification of the GGBF-slag in the NaOH solution.…”

Section: Sample Name Descriptionmentioning

confidence: 99%

CO<SUB>2</SUB> Sequestration via a Surface-Modified Ground Granulated Blast Furnace Slag Using NaOH Solution

et al. 2011

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This study investigates the improvement of the CO 2 sequestration percentage of a ground granulated blast furnace slag (GGBF-slag) with surface modification using a NaOH solution. The amount of CO 2 sequestration of the GGBF slag increased via the surface modification with the NaOH solution in the direct carbonation method. The increase of the carbonation percentage of the GGBF slag resulted from the increase in the hydraulic activity of the GGBF-slag. The carbonation percentage on the basis of the total calcium oxide of the GGBF slag was approximately 10 times larger than that of the GGBF-slag without the surface-modification. The carbonation rate depended on the morphology of the calcium carbonates formed on the surface of the GGBF-slag.

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Carbonation degree of autoclaved aerated concrete

Cited by 82 publications

References 3 publications

Microstructure Changes in Autoclaved Aerated Concrete during Carbonation under Working and Accelerated Conditions

Microstructure Changes in Autoclaved Aerated Concrete during Carbonation under Working and Accelerated Conditions

Carbonation of autoclaved aerated concrete containing fly ash

CO<SUB>2</SUB> Sequestration via a Surface-Modified Ground Granulated Blast Furnace Slag Using NaOH Solution

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