Influence of Nitrate Species ANO₃ and ANO₃·nH₂O on Physico-Mechanical Properties of the Aluminosilicate Adhesives for Wood and Wooden Structures

Abstract:

The article presents the results of studies of the effect of lithium, sodium, potassium and ammonium nitrates on the physical and mechanical properties of aluminosilicate adhesives intended for gluing wood and structures based on them. Nitrates were introduced into the aluminosilicate adhesive of composition Na₂O·Al₂O₃·6SiO₂·20H₂O in amounts of 0.5, 1 and 1.5 wt. %. Changes in the shear strength along the fibers of substrates made of pine, beech, and oak wood were studied after 7 and 28 days of hardening of aluminosilicate adhesives in vivo. It is shown that for gluing pine wood it is most expedient to use adhesives containing lithium nitrate, potassium nitrate and ammonium nitrate is within 1.5 wt. %, the shearing strength along the fibers after 28 days of hardening is 1.7-1.8 times higher than the strength of the adhesive without additives. For gluing beech wood, it is most advisable to use adhesives containing potassium and ammonium nitrate in an amount of 1.5 wt. %, the shearing strength along the fibers after 28 days of hardening is 1.5 times lower than the strength of the adhesive without additives. For gluing oak wood, it is most advisable to use adhesives containing lithium nitrate, potassium nitrate and ammonium nitrate in amounts of 0.5 and 1.5 wt. %, the shear strength along the fibers increases by 1.3-1.5 times for 7 and 28 days of hardening compared to the strength of the adhesive without additives. According to the degree of influence on strength, modifying additives can be ranked in the series LiNO₃×3H₂O>KNO₃>NH₄NO₃>NaNO₃.

• Periodical: Solid State Phenomena (Volume 325)
• Pages: 143-149
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.325.143
• Online since: October 2021
• Authors: Sergii G. Guzii*, Ihar Bazhelka, Volodymyr Romaniuk, Svitlana Davydivna Lapovska
• Keywords: Adhesives, Aluminosilicate Binders, Nitrate Species, Physico-Mechanical Properties, Wood, Wooden Structures

References

[1] S. Guzii, I. Bazhelka, V. Lashchivskyi, Study of the influence of compounds of the ANO3 and ANO3 nH2O types on rheokinetic and colloid chemical properties of aluminosilicate adhesives for wood. J. ScienceRise No 5(70) (2020) 14-23. doi: http://doi.org/10.21303/2313-8416.2020.001493.

DOI: 10.21303/2313-8416.2020.001493

[2] L. M. Kovalchuk, Production of glued timber structures. Moscow. Forest Industry, (1987).

[3] O. Ulker, Wood Adhesives and Bonding Theory. Adhesives – Applications and Properties (2016). doi: https://doi.org/10.5772/65759.

[4] S.I. Ovsyannikov, D.Yu. Shapovalov, Increasing the strength of adhesive joints of wooden structures. Bulletin of Science and Education of the Northwest of Russia. Vol. 4 No.4 (2018) 1-6.

[5] S. Guzii, P. Krivenko, O. Bondarenko, T. Kopylova, Study on physico-mechanical properties of the modified alkaline aluminosilicate adhesive-bonded timber elements. J. SSP. Vol. 296 (2019) 112-117.

DOI: 10.4028/www.scientific.net/ssp.296.112

[6] GOST 16483.5-73. Wood. Methods for determination of ultimate shearing strength parallel to grain.

[7] S.G. Guzii, O.P. Bondarenko, A.N. Milonova, Temperature dependence of the strength of wood glue joints based on geocement adhesive. Collection of articles by the participants of the 7th International Scientific and Technical Conference Problems of Reliability and Durability of Engineering Structures and Buildings in Railway Transport,. November 14-16. Kharkiv. Ukraine. (2018) 104-105.

[8] G. Korn, T.M. Korn, Mathematical handbook for Scientist and Engineers. McGraw-Hill Book Company, (1968).