Influence of quartz particle size on the chemical and mechanical properties of autoclaved aerated concrete (I) tobermorite formation

Isu, Norifumi; Ishida, Hiroyuki; Mitsuda, Takeshi

doi:10.1016/0008-8846(95)00003-8

Cited by 97 publications

(34 citation statements)

References 4 publications

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“…From the XRD results, it is found that the AACs consisted of tobermorite, residual α-quartz, calcite and C-S-H; these results were also confirmed by many researchers Isu et al 1995;Kikuma et al 2011;Straube and Schoch 2014;Qu and Zhao 2017). The main hydration products in the AACs that used natural sand as silica material belonged to the tobermorite group of calcium silicate hydrates; there are few differences among the three types of AACs (VN1, VN2 and JP).…”

Section: Mineralogical Component Of Aacssupporting

confidence: 66%

“…aluminum powder). Due to high temperature and saturated steam pressure curing (typically, reaching a pressure of 0.8 -1.2 MPa and a temperature of 180 -200°C), the hydration products of AAC are mainly tobermorite group of calcium silicate hydrate (C-S-H) (Alexanderson 1979;Schober 2005;Matsui et al 2011;Isu et al 1995;Kikuma et al 2011;Straube and Schoch 2014). The compositions of the hydration products in AAC are therefore quite different from those in normal concrete i.e.…”

Section: Introductionmentioning

confidence: 99%

“…C-S-H, calcium hydroxide (CH), ettringite and monosulfate. However, the quantity and degree of crystallization of C-S-H in AAC are significantly influenced by raw materials (Alexanderson 1979;Schober 2005;Matsui et al 2011;Straube and Schoch 2014;Qu and Zhao 2017), the properties of raw materials (Alexanderson 1979;Schober 2005;Isu et al 1995;Kikuma et al 2011;Straube and Schoch 2014) and the autoclaving process (Alexanderson 1979;Schober 2005;Straube and Schoch 2014;Mitsuda et al 1992).…”

Section: Introductionmentioning

confidence: 99%

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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: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Light-weight bricks usually called Autoclaved Aerated Concrete (AAC) is normally manufactured from siliceous materials (quartz-rich sand), calcareous materials (lime and cement) and calcium sulphate with traces of aluminium powder as foaming agent to produce porous [1][2][3][4][5][6]. These components are mixed with water under saturated steam pressure includes the hydrothermal treatment process at high-temperature (typical, 180 o -200 o C) for several hours [4,5,7].…”

Section: Introductionmentioning

confidence: 99%

“…These components are mixed with water under saturated steam pressure includes the hydrothermal treatment process at high-temperature (typical, 180 o -200 o C) for several hours [4,5,7]. The foaming agent reacts with calcium hydroxide or alkali to form hydrogen gas bubbles, then it contributes to produce high porosity in AAC [1,6].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Damage Factors in Industrial Scale of Light-Weight Bricks Production

Wulandari

Ekaputri

2017

MATEC Web Conf.

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Abstract.A damage case of light weight brick's production approximately at 6-7% of total production was found daily in one industry in East Jawa, Indonesia. The physical damage of product always occured. This paper investigates some factors that affect the lost in laboratory analysis. The analysis includes the chemical analysis of raw materials, reactivity of pozzolanic materials, and observation of strength based upon the position of light-weight bricks during autoclaving process. In addition, fly ash is introduced as mineral additive as one of the alternatives to improve the product's quality. It is also concluded that grinding the silica sands particles is the optimum way to improve the quality, but the adding class F of fly ash to five percent in mixture is the most effective solution. Furthermore, maintaining quality of raw materials, curing process, and maintaining the machine will either reduce the product damage that occurred during the fabrication process in industry.

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Innovative recycling approaches to enable new material loops for AAC

Thome

Shamshafshejani

2022

ce papers

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This paper shows different approaches to save mineral resources or energy for the production of autoclaved aerated concrete (AAC) using secondary materials. The goal is to implement new recycling routes in the building industry and to establish new material loops. It could be shown, that AAC can act as a sink for fine fractions from building rubble consisting of waste concrete and calcium silicate masonry units (CSU) by replacing the primary quartz sand. By choosing secondary raw materials like rice husk ash with a higher solubility than quartz, it is even possible to achieve AAC with the desired properties at lower autoclaving temperatures. After the end of life, AAC can be treated with the patented approach “ENSUBA,” a wet‐chemical washing procedure, which enables the complete removal of sulfate ions, which usually cause problems in the recycling of AAC. After this treatment waste AAC can easily be brought back to the material cycle and for example be used as a raw material for cement production. Most importantly, this ENSUBA approach can be combined sensibly with a carbon capture technique like the chilled ammonia process. This process captures CO2 from the cement production in an ammonia solution, leading to the precipitation of ammonium carbonate, which is needed for the ENSUBA process.

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Influence of quartz particle size on the chemical and mechanical properties of autoclaved aerated concrete (I) tobermorite formation

Cited by 97 publications

References 4 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-

An Investigation of Damage Factors in Industrial Scale of Light-Weight Bricks Production

Innovative recycling approaches to enable new material loops for AAC

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