Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Application of innovative tests of twist-off and cylindrical chamber and development of a new theoretical model to measure the rate of water penetration in concrete

Document Type : Original Article

Authors
Ali Saberi Vaezaneh 1
Mahmood Naderi 2
sardarwali din 3
1 Ph.D, Civil Engineering Faculty, Imam Khomeini International University, Qazvin, Iran.
2 Professor, Department of Civil Engineering, Imam Khomeini International University, Qazvin, Iran
3 Ph.D student,. Civil Engineering Faculty, Imam Khomeini International University, Qazvin, Iran.
10.22065/jsce.2024.451959.3390
Abstract
The mechanical characteristics and reliability of concrete are directly related to the structural characteristics of the microscopic pores of concrete. Considering that in Euclidean geometry, all dimensions are integers, therefore, the structure of microscopic pores cannot be defined by it. Therefore, in this article, passing the limitations such as one-dimensional and two-dimensional, etc., a new theory has been presented that expresses the real characteristics of complex systems. Dimension length of complexity and surface area of pores are important characteristics of the mentioned model. Also, by examining the valid international standards, it can be seen that laboratory devices are needed to measure the permeability of concrete and it is not possible to evaluate the permeability at the project site. For this reason, there is a need to introduce and use new and in-situ tests to measure the permeability and strength of concrete. In this article, to measure the rate of water penetration into concrete as well as the surface resistance of concrete, innovative and in-situ tests of cylindrical chamber and twist-off have been used. The devices related to the mentioned tests are very simple, repeatable and can be used at the project site. The results of the tests show the high accuracy of the introduced theoretical model for measuring the rate of water penetration in concrete. Also, a very small difference between the laboratory results and the theoretical results was observed. By using the twist-off test, it is possible to evaluate the compressive strength of concrete without breaking the sample with a coefficient of determination of about 95%.
Keywords
Twist-off
Rate of water penetration
Theoretical model
Cylindrical chamber
Concrete

Subjects

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  • Receive Date 22 April 2024
  • Revise Date 15 May 2024
  • Accept Date 11 July 2024