Study of the engineering characteristics of slates for brick production in north Hamadan province

Authors

1 Assist. Prof., Dept. of Geology, Imam Khomeini International University, Qazvin, Iran

2 M. Sc., of Geology, national standards organization, Hamedan, Iran

3 Assoc. Prof., Dept. of Geology, Earth Sciences Faculty, Shahrood University of Technology, Shahrood, Iran

Abstract

The objective of this study is to investigate the characteristics of slates and metamorphosed shales in Hamadan province for their potential use in brick production. Firstly, the slatey and shaley units of geological Formations in Kabudar Ahang, Razen, Hamedan, and Tuserkan with a scale of 1:100,000 were identified, and their geological and petrological data of metamorphic units were collected. Following field visits, five sampling locations were selected. The results of the chemical analysis of the main oxides and X-Ray Diffraction analyses confirmed that the lithological composition of the sampling sites is slate and metamorphosed shales. According to the results of the data obtained from the chemical analysis, the composition of the studied rocks meets the required standards for brick preparation (Standard No. 7 of the National Standards Organization of Iran). After preparing the samples, physical, chemical, and mechanical tests were conducted on the bricks. The density values of the manufactured bricks indicate they are lighter than regular bricks. Water absorption of the produced bricks is within the acceptable range for facing bricks and pressed bricks according to Iran's national standard. All the slate and metamorphosed shale bricks are in good condition in terms of strength and can be used for engineering, facing, and pressed bricks. Results of the freezing test on the bricks subjected to 50 cycles of freezing and thawing show that the weight loss percentage of the samples falls within the permissible limit of Iran's national standard (No.7). Also, the amount of soluble salts in the bricks is at the optimal level. Overall, all the properties examined in the slate bricks comply with relevant standards, indicating their suitability for use in the brick-making industry, which is economically and environmentally significant.

Keywords

References

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History

  • Receive Date: 15 March 2023
  • Revise Date: 14 June 2023
  • Accept Date: 19 June 2023

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