Tensile strength of different types of limestone rocks in north of Iraq

Mohammed, Diyari Abdalrahman; Alshkane, Younis M.; Hamaamin, Yassen A.; Mahmood, Arian Omer

doi:10.1007/s41062-021-00620-y

Cited by 1 publication

(1 citation statement)

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“…NDT methods can directly evaluate the quality of a building even on-site by estimating the compressive strength of the concrete structure, and the most commonly used NDT method is the Schmidt hammer [8,11,12]. Several authors have used the Schmidt hammer to measure concrete strength [8,[13][14][15][16]. A Schmidt hammer, also known as a Swiss hammer or a rebound hammer, is a portable device that measures the elastic properties or the strength of concrete.…”

Section: Introductionmentioning

confidence: 99%

Practical Aspects of Correlation Analysis of Compressive Strength from Destructive and Non-Destructive Methods in Different Directions

Badarloo,

Lehner

2023

Infrastructures

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The research presented here demonstrates the practical aspects of the numerical correlation of the results of the compressive strength test. The destructive test (DT) in a hydraulic press and the non-destructive test (NDT) using a Schmidt hammer in several process variations were evaluated. The aim was to evaluate the real differences between the tool supplier’s curve and testing. Therefore, 150 concrete cube specimens with an edge length of 150 mm were produced using a mixture of three types of concrete classes: C30, C35, and C40. The test was carried out 7 and 28 days of age of the concrete. The Schmidt hammer test was carried out in horizontal (θ = 0) and vertical (θ = 90) directions and using a series of 10 measurements. Furthermore, the tests were performed in two sets: first, the sample was placed on the ground, and second, under a hydraulic jack with a load of 50% of the maximum bearing capacity of specific concrete. Then, regression analysis was performed on the data sets to establish linear mathematical relationships between compressive strength and number of bounces. The results showed that the correlation between the DT and NDT tests has a high value for each group, but the correlation equations are different and must be taken into account.

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