Theoretical Basis of Formation Highly Organized Porous Structure of Aerated Concrete

Suleymanova, L.A.; Pogorelova, I.A.; Marushko, M.V.

doi:10.4028/www.scientific.net/MSF.945.309

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HomeMaterials Science ForumFarEastСon - Materials and ConstructionTheoretical Basis of Formation Highly Organized...

Theoretical Basis of Formation Highly Organized Porous Structure of Aerated Concrete

Abstract:

Theoretical principles of the formation of highly organized porous structure of cellular concrete are developed, based on model concepts of the dynamics of the expanding gas cavity in the liquid phase as a single control cell. The peculiarities of controlling the formation of cellular structure of aerated concrete based on the balance of forces in a three-phase disperse system on the model "gas pore - molding mixture" are revealed and a coalescing-aggregate scheme for porosity formation of the aerated concrete mixture is proposed. It is shown that, in accordance with the refined Rayleigh-Plesset equation, the determining factor in the formation of the cellular structure of aerated concrete is the pressure over the mixture to be poroused, the effect of the porosity being achieved by reducing the external pressure to the vacuum level. The division of pores by size in anaerated concrete mixture is proposed. The maximum pore size is determined by the capillary Laplace constant. The prospects of aerated concrete technology are associated with a decrease in the maximum and average size of cellular pores, as well as methods for eliminating pores of air entrainment and segmented pores. Reducing of the size of the pores will be reflected in the decrease of the Bond quantity and in the increase of the importance of capillary forces in the formation of the porous structure of aerated concrete. The concepts of the types of cellular structures are developed, depending on the average density and their boundaries for cellular concrete are established.

Info:

Periodical:

Materials Science Forum (Volume 945)

Main Theme:

FarEastСon - Materials and Construction

Edited by:

Dr. Denis Solovev

Pages:

309-317

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.945.309

Citation:

L.A. Suleymanova et al., "Theoretical Basis of Formation Highly Organized Porous Structure of Aerated Concrete", Materials Science Forum, Vol. 945, pp. 309-317, 2019

Online since:

February 2019

Authors:

L.A. Suleymanova, I.A. Pogorelova, M.V. Marushko

Keywords:

Aerated Concrete, Aerated Concrete Mixture, Cellular Structure Formation, Composite Bound Materials, Pores, Porous Structure, Process Control

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References

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[4] Geguzin, Ya.Е. Bubbles. Nauka, (1985).

[5] Suleymanova L.А. Non-autoclaved aerated concrete based on composite binders. Belgorod: BSTU publishing office, (2013).

[6] Suleymanowa L.A., Lessowik W.S., Kara К.А., Lessowik G.A. Zum problem der optimisierung von porigkeit des zellbetons der nichtautoklaven erhärtung. 19-te Internationale baustofftagung. IBAUSIL 2015. (2015) 1343-1349.

[7] Suleymanova L.A., Kara K.А., Suleymanov K.A., Pyrvu A.V., Netsvet D.D., Lukuttsova N.P. The topology of the dispersed phase in aerated concrete // Middle East Journal of Scientific Research. 18 (10) (2013) 1492-1498.

[8] Suleymanova L.А. The process control of cellular concretes porous structure formation. Bulletin of Belgorod State Technological University named after V.G. Shukhov. 2 (2016) 69-76.

Paper TitlePages

A Research on Performance of Polystyrene-Aerated Concrete Wall Materials

Authors: Peng Guo, Rui Yan Wang, Min Feng, Xue Juan Cao

Abstract: Recycled waste polystyrene foam can be used as heat-resistant construction material, which helps reduce white pollution, benefit the renewability of resources, and brings a good economic and environmental return. Here in this paper, polystyrene foamy particle is used as filling material for the making of non-autoclave aerated concrete, which has good performance with heat reservation and sound insulation.

556

Utilization of Desulfuration Residues in Non-Autoclaved Aerated Concrete

Authors: Fang Xian Li, You Zhi Chen, Qi Jun Yu, Jiang Xiong Wei

Abstract: Desulfuration residues were used as aggregate to produce Non-autoclaved aerated concrete. The effects of water-hinder ratio, casting temperature on the gas forming behavior, and those of desulfuration residue content on the compressive strength and bulk density of aerated concrete were investigated. The types of the hydration products and the microstructure of Non-autoclaved aerated concrete with desulfuration residue were investigated by means of X-ray diffraction and scanning electron microscope. Results show that the optimum replacement amount was determined as 50% and at this rate the compressive strength, bulk density of Non-autoclaved aerated concrete were measured as 2.83 MPa and 543 kg/m³. The hydration products of Non-autoclaved aerated concrete with desulfuration residue are C₂SH (A) and C₂SH (B) along with ettringite and hydrogarnet phases.

707

Mix Ratio Test and Basic Property Analysis for Autoclaved Aerated Concrete (AAC) Block

Authors: Ze Wu Fu, San Hai Zeng

Abstract: Through the mix ratio optimization test, the appropriate autoclaved aerated concrete block may be prepared for the production demand, whose technical indexes could satisfy the requirement of national specification. Furthermore, in the light of the research on the property of autoclaved aerated concrete block for this mix ratio, the strength of concrete block would decrease with the increase of total porosity among the pore diameter from 0.5mm to 1.5mm. The autoclaved aerated concrete block possessed the strong capability of absorbing water, so the volume water absorption rate increased quickly at first and then went down furiously, which could make the shrinkage of autoclaved aerated concrete block augment because of the decrease of its water absorption rate.

508

Effect of Raw Material Ratios on the Compressive Strength of Chang Jiang Iron Ore Gangues Aerated Concrete Block

Authors: Wen Hua Xu, Hao Zhang, Wei Jun Ren, Jin Yi Wu

Abstract: The present study was to investigate the production of aerated concrete block from ChangJiang iron ore gangues. Analyze Quartz Sand, cement, CaO and gangue’s ratio’s influence on the aerated concrete block’s compressive strength, and then determine the optimum ratio. The results shows that gangue, quartz sand, cement, CaO, gypsum, aluminum powder, additive’s optimum ratio is 60.11%，8.26%，15.03%, 14.07%, 2%, 0.06% and 0.07% the dry weight of raw materials. Obtain the strongest compressive strength with the ratio 0.59:1 for water and raw materials. Adding iron gangues into aerated concrete block can turn wastes into treasures, which is originally done by us.

Microstructure of Autoclaved Aerated Concrete Hydration Products in Different Water-to-Binder Ratio and Different Autoclaved System

Authors: Zhao Ming Huang, Yu Fei Yuan, Ze Jie Chen, Zi Yun Wen

Abstract: Using XRD and SEM analysis, the types and morphology of autoclaved aerated concrete (AAC) hydration products in different water-to-binder ratio (w/b) and different autoclaved system were studied. Strength test shows that, Using w/b=0.25 and autoclaved curing 190°C for 8h, AAC with dry density 765kg/m3 and compressive strength 7.5MPa was made. XRD and SEM analysis indicate that, the higher the autoclaved temperature is, the smaller the size of hydration products (most of them are tobermorite and hydrogamet) is, and the crystallinity has a little increase; with the extension of autoclaved time, the size of products is smaller, the crystallinity is first increased and then decreased, the crystal form of tobermorite turns 1.1nm into 1.4nm; the less the w/b is, the smaller the size of products is, and the higher the crystallinity is, and tobermorite turns 1.1nm into 1.4nm.

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