Impact of density and special features of manufacturing process on drying of autoclaved aerated concrete masonry blocks

Authors

  • Sanita Rubene Riga Technical university
  • Martins Vilnitis Riga Technical university
  • Juris Noviks Riga Technical university

DOI:

https://doi.org/10.17770/etr2015vol1.212

Keywords:

autoclaved aerated concrete, electrical impedance spectrometry, humidity distribution, non-destructive testing.

Abstract

Autoclaved aerated concrete (AAC) masonry blocks are construction material with high heat insulation parameters. In time of sustainable construction, this material can be used as a load bearing construction material for a range of buildings where it is necessary to obtain high heat insulation parameters of external delimiting constructions. The main problem of autoclaved aerated masonry constructions is the significant influence of relative humidity rate and its gradient on heat resistivity properties of the masonry constructions. Therefore it is important to monitor the drying process of AAC masonry constructions in order to avoid the sealing of moisture inside the masonry by early application of finishing layers on the construction. As there is a variety of manufacturers who offer AAC masonry blocks and the manufacturing process of the blocks slightly differ as well as the ingredients used for the manufacturing of the blocks this research has been done to determine the impact of manufacturing features and density of the blocks on their drying properties. The testing has been performed by non-destructive testing method – electrical impedance spectrometry (EIS) In the paper, there are included results of research of correlation between EIS and moisture content rate in masonry blocks provided by different manufacturers. All used blocks are with similar material density. As a result of the research correlation formulas between saturation rate of the material and EIS measurement result have been established and a graph of humidity migration throughout the cross section of the masonry construction has been determined.

Downloads

Download data is not yet available.

Author Biographies

  • Sanita Rubene, Riga Technical university
    Faculty of Civil Engineering
  • Martins Vilnitis, Riga Technical university
    Faculty of Civil Engineering
  • Juris Noviks, Riga Technical university
    Faculty of Civil Engineering

References

M. Barsottelli, G. F. Cellai, F. Fratini I and C. Manganelli Del Fa. The hygrometric behaviour of some artificial stone materials used as elements of masonry walls. Materials and Structures/Mat6riaux et Constructions, Vol. 34, May 2001, pp 211-216.

Bruce RR, Klute A The measurement of soil moisture diffusivity. Soil Sci Soc Am Proc, 1956, pp:458–462.

Kuenzel HM. Simultaneous heat and moisture transport in building components. IRB Verlag, Stuttgart, 1995.

Pel L, Brocken H, Kopinga K. Determination of moisture diffusivity in porous media using moisture concentration profiles. Int J Heat Mass Transf 39, 1996, pp:1273–1280.

Pel L, Landman KA, Kaasschieter EF. Analytic solution for the non-linear drying problem. Int J Heat Mass Transf 45, 2002. pp:3173–3180.

Pel L, Landman KA. A sharp drying front model. Drying Technol 22. 2004. pp:637–647

Matiasovsky P., Mihalka P. Pore Structure Parameters and Drying Rates of Building Materials. J. M. P. Q. Delgado (ed.), Drying and Wetting of Building Materials and Components, Building Pathology and Rehabilitation 4, DOI: 10.1007/978-3-319-04531-3_4, © Springer International Publishing Switzerland 2014, pp. 71–90.

G.Quincot, M.Azenha, J. Barros, R.Faria. “ State of the art – Methods to measure moisture in concrete” Projetos De Investigação Científica E Desenvolvimento Tecnológico, Portugal, 2011.

Villain, G. and M. Thiery. "Gammadensimetry: A method to determine drying and carbonation profiles in concrete." NDT & E International 39(4), 2006. p.328-337.

S. Multon, E. M. "Water distribution in beams damaged by alkali-silica reaction: global weighing and local gammadensitometry." Materials and Structures Vol. 37, 2004.

Physics, C. "Relative humidity sensors" 2010: 1-3.

Wiederhold, P. R. "Water vapor measurement, methods, and instrumentation." Marcel Dekker, Inc. New York, 1997. p. 384.

Zachary Grasley, D. A. L. "Relative humidity in concrete." ACI Committee 236, 2006. p.51-57.

McCarter, W.J.; Garvin, S. Dependence of Electrical Impedance of Cement-Based Materials on their Moisture Condition. In: Journal of Applied Physics Series D: Applied Physics 22 (1989), No. 11, S. 1773-1776.

Elsener, B. Ion Migration and Electric Conductivity in Concrete. Zürich: SchweizerischerIngenieur- und Architekten-Verein, 1990. - In: Korrosion und Korrosionsschutz. Tl 5. Electrochemical Protection Process for Concrete Building Structures, Symposium 15. November 1990, S. 51-59.

Skramlik, J., Novotny, M.. One-dimensional moisture transport monitored by a non-destructive method. International Journal of Computers Issue 4, Volume 2, 2008.

Farshad Rajabipour, Jason Weiss, John D. Shane, Thomas O. Mason, and Surendra P. Shah. A PROCEDURE TO INTERPRET ELECTRICAL CONDUCTIVITY MEASUREMENTS IN COVER CONCRETE DURING REWETTING. Journal of Materials in Civil Engineering, 2005. 17(5), pp:586–594.

Weiss, W. J., Shane, J. D., Mieses, A., Mason, T. O., and Shah, S. P. Aspects of monitoring moisture changes using electrical impedance spectroscopy. Proceedings of the 2nd Symposium on Self-Desiccation and Its Importance in Concrete Technology, Lund, Sweden. 1999.

Schieβl, A., Weiss, W. J., Shane, J. D., Berke, N. S., Mason, T. O., and Shah, S. P. Assessing the moisture profile of drying concrete using impedance spectroscopy. Concrete Science and Engineering, 2, 2002. pp:106-116.

Parilkova, J. The EIS Method and a Z-meter III Device, a lecture within an event in Litice.

Rubene S. et al. Determination of Humidity Level in Aerated Concrete Constructions by Non Destructive Testing Methods, in Proc “Innovative Materials, Structures and Technologies” Riga, 2014 p.135-140.

Rubene S., Vilnitis M. Application of Electrical Impedance Spectrometry for Determination of Moisture Distribution in Aerated Concrete Constructions in Proc. “1st Conference and Working Session Eureka! 7614” Brno, Czech Republic, 2013. p. 124-130.

Rubene, S., Vilnītis, M., Noviks, J. Monitoring of the Aerated Concrete Construction Drying Process by Electrical Impedance Spectrometry. In: Proceedings of 4th International Conference "Advanced Construction 2014", Lithuania, Kaunas, 9-10 October, 2014. Kaunas: Kaunas University of Technology, 2014, pp.216-220. ISSN 2029-1213.

Rubene, S., Vilnītis, M., Noviks, J. Impact of Masonry Joints on Detection of Humidity Distribution in Aerated Concrete Masonry Constructions by Electric Impedance Spectrometry Measurements. International Journal of Civil, Architectural, Structural and Construction Engineering, 2015, Vol.9, No.1, pp.1089-1094. e-ISSN 1307-6892.

http://aeroc.lv/index.php?page=938&lang=lat&cnt=AEROC_Universal site accessed on 17.03.2015.

http://www.ytong-silka.pl/ru/content/756.php site accessed on 17.03.2015.

http://www.texoblock.lv/upload/buklets_lv.pdf site accessed on 17.03.2015.

http://roclite.lv/v2/tehniskie-parametri/fiziskas-un-tehniskas-ipasibas/ site accessed on 17.03.2015.

Vu TH. Influence of pore size distribution on drying bahaviour of porous media by a vontinuous model. PhD thesis, Otto von Guericke University, Magdeburg. 2006.

Akita, H., Fujiwara, T. and Ozaka, Y.." A practical procedure for the analysis of moisture transfer within concrete due to drying." Magazine of Concrete Research 48 (6), 1996, p.129-137.

Downloads

Published

2015-06-16

How to Cite

[1]
S. Rubene, M. Vilnitis, and J. Noviks, “Impact of density and special features of manufacturing process on drying of autoclaved aerated concrete masonry blocks”, ETR, vol. 1, pp. 186–192, Jun. 2015, doi: 10.17770/etr2015vol1.212.