Mechanical and hydration characteristics of autoclaved aerated concrete (AAC) containing iron-tailings: Effect of content and fineness

Cai, Lixiong; Ma, Baoguo; Li, Xiang Guo; Lv, Yang; Liu, Zhuolin; Jian, Shouwei

doi:10.1016/j.conbuildmat.2016.10.031

Cited by 109 publications

(43 citation statements)

References 26 publications

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“…The resulting phases therefore arise from the hydration products of the pozzolanic reaction of the FBC fly ash. This result is consistent with the ones previously reported [18][19][20][21]…”

Section: Microstructuresupporting

confidence: 94%

Experimental study of autoclaved aerated concrete using circulating fluidized-bed combustion fly ash

Šebestová¹,

Černý²,

Drochytka³

2020

Mater. Tehnol.

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The research deals with the possibility of maximum utilization of FBC fly ash in AAC technology and its impact on the properties of AAC. In the research, fly ash was used as a partial substitute for binder components in the AAC formulation. The amount of fly ash substitution was chosen on a scale of 10 % to 100 %. Physical-mechanical properties such as compressive strength and bulk density were determined on autoclaved samples. XRD analysis, SEM/EDX analysis were performed. Using these analyses, the change in the microstructure of autoclaved aerated concrete was monitored with increasing amount of FBC fly ash used. EDX microstructural tests have confirmed the incorporation of aluminum ions into the crystalline CSH. Further, an amount of crystalline tobermorite in the samples was observed which was almost constant up to 50 % of the FBC substitution. Compressive strength also began to decline significantly when the 50 % FBC fly ash substitution threshold was exceeded. The results thus show that the maximum FBC fly ash substitution is possible up to 50 %.Uporaba dimni{kega pepela, nastalega med zgorevanjem premogovega prahu v vrtin~asti plasti (CFBC) v izdelkih za gradbeni{tvo, je zahtevna zaradi njegove visoke vsebnosti`vepla. Mikrostruktura v avtoklavih prezra~enega betona (AAC) pa se spremeni v hidrotermalnih pogojih in tvorijo se kristalini~ni kalcij-silikatni hidrati (CSH). Ti so sposobni vezati v svojo strukturo kalcijev sulfat, ki ga vsebuje CFBC dimni{ki pepel. V raziskavi avtorji ugotavljajo kak{na je {e maksimalna mo`na koli~ina dodanega CFBC dimni{kega pepela v beton, izdelan z AAC tehnologijo in njen vpliv na lastnosti tako izdelanega AAC. V raziskavi so avtorji nadome{~ali`ivo apno z dimni{kim pepelom v skladu z AAC receptom. Nato so iz izdelanega betona naredili preizku{ance in dolo~ili njegove fizikalno-mehanske lastnosti, kot sta: tla~na trdnost in volumska gostota. Rezultati raziskave jasno ka`ejo mo`nost uporabe nadomestka v obliki dimni{kega pepela v koli~ini do 50 %. Nadalje so izvedli {e XRDin SEM/EDX-analize, ki so potrdile spremembe mikrostrukture prezra~enega betona zaradi uporabe pove~ane koli~ine CFBC dimni{kega pepela. EDX mikrostrukturne analize so potrdile vgradnjo aluminijevih ionov v kristalini~ni CSH. Klju~ne besede: v avtoklavih prezra~eni beton (AAC), zgorevanje premoga v vrtin~asti plasti (CFBC), dimni{ki pepel, tobermorit, zmanj{anje emisij 157

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Section: Microstructuresupporting

confidence: 94%

Experimental study of autoclaved aerated concrete using circulating fluidized-bed combustion fly ash

Šebestová¹,

Černý²,

Drochytka³

2020

Mater. Tehnol.

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“…The authors [32] showed that main hydration products in ACC are: poorly crystallized C-S-H gel and highly crystalline 11 Å tobermorite (autoclaving process at temperature of 100°C). It was also confirmed by research results [33][34][35][36]. In turn, the studies [34] showed that anhydrite, hydrogranates and small amounts of minerals such as quartz and calcite may be formed in AAC with addition of CBPD.…”

Section: Microstructure Of Standard and Autoclaved Cementsupporting

confidence: 62%

The Influence of Cement Bypass Dust on the Properties of Cement Curing Under Normal and Autoclave Conditions

Tkaczewska¹

2019

SAE

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This paper analyses the properties of cement binders composed with cement CEM I 42.5R and cement bypass dust in amount of 0.5, 1.0 and 5.0% by mass of binder, curing under standard and additionally autoclave conditions. The bypass dust increases the water content for standard consistency and delays the initial setting time of binder. The cement paste containing 5% of dust reveals the change in volume by 6 mm according to Le Chatelier test. After 2 days, the compressive strength of cement mortar containing bypass is comparable to that of Portland cement mortar, but at later time the strength development of this cement binder is slower. The addition of cement bypass dust in amount to 1% can obtain the cement of strength class of 42.5R according to standard PN-EN 197-1. The autoclave curing improves the compressive strength of cement mortar. The SEM/EDS observations confirm the presence of low crystalline C-S-H gel and well-formed tobermorite fibres in autoclaved cement mortar containing 5% of cement bypass dust.

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“…However, the utilization rate of iron tailings is only 7% [12]. Iron tailings are mainly used for recovery [13], fire blocks [14], ceramsite [15], concrete aggregate [16], mineral admixture in the process and concrete industry [17], and additions in the ceramic industry [18] and other fields. Work by Ma [19] studied the heavy metal leaching of iron tailings, which shows that the concentration of heavy metal leaching of iron tailings is within the range of Chinese standards of GB/T 5085.3 [20].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Hydraulic, Physical, and Mechanical Properties of Pervious Concrete Using Iron Tailings as Coarse Aggregates

2020

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Aggregates are a significant component of pervious concrete. Pervious concrete using iron tailings as coarse aggregates was prepared to study the feasibility of this approach. A mix design procedure was also used to design pervious concrete based on different target porosities. The effective porosity, measured porosity, dry density, compressive strength, and permeability coefficient of pervious concrete were studied. The results show that the mix design procedure based on a target porosity is relatively reasonable for designing iron tailing-based pervious concrete. The 28 d compressive strength of the pervious concrete decreased from 42 to 11 MPa as the effective porosity increased from 5.2% to 27.2%. The effective porosity of the equilibrium point of the compressive strength and permeability coefficient of pervious concrete was approximately 16%, where the compressive strength was 21.5 MPa, and the water permeability was 3.2 mm/s. The permeability coefficient of pervious concrete can be predicted as an exponential function of the effective porosity, and the compressive strength of pervious concrete can be predicted as a logarithmic function of the effective porosity.

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Mechanical and hydration characteristics of autoclaved aerated concrete (AAC) containing iron-tailings: Effect of content and fineness

Cited by 109 publications

References 26 publications

Experimental study of autoclaved aerated concrete using circulating fluidized-bed combustion fly ash

Experimental study of autoclaved aerated concrete using circulating fluidized-bed combustion fly ash

The Influence of Cement Bypass Dust on the Properties of Cement Curing Under Normal and Autoclave Conditions

Evaluation of the Hydraulic, Physical, and Mechanical Properties of Pervious Concrete Using Iron Tailings as Coarse Aggregates

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