Assessing the uniaxial compressive strength and tangent Young’s modulus of basalt rock using the Leeb rebound hardness test

H Aldeeky,O Al Hattamleh,S Rababah

doi:10.3989/mc.2020.15119

H Aldeeky, O Al Hattamleh + Show 1 more

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https://doi.org/10.3989/mc.2020.15119

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Abstract

Basalt was used as an ornamental stone in any historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young’s modulus (Et) in the laboratory requires premium quality specimens with special core dimensions. This research focuses on correlations both UCS and Et with Leeb Rebound Hardness Test (LRH). In the laboratory, UCS, Et, and LRH were performed on 90 core samples extracted from 30 different rock boulders collected from the neighboring area of Umm al-Jimal, a historic city in northeastern Jordan. A strong power correlation with (R2 = 0.888, RMSE = 5.464) was found between non-destructive LRH value and UCS. On the other hand, a moderately strong linear regression with (R2 = 0.792, RMSE = 4.661) was found between Et and LRH. In conclusion, non-destructive LRHs can be used as indictors for evaluating both UCS and Et during the restoration of the historic city Umm al-Jimal and the rehabilitation of other existing structures.

Highlights

Basalt was used as an ornamental stone in many historic and ancient cities in Jordan
This research examined the correlation between Leeb Rebound Hardness Test (LRH) and the mechanical engineering properties for both uniaxial compressive strength (UCS) and Et for basalt rock
LRH value, UCS and Et were conducted on core specimens extracted from 30 different boulders collected from the neighboring area of Umm al-Jimal city

Summary

Introduction

Basalt was used as an ornamental stone in many historic and ancient cities in Jordan. UCS, Et, and LRH were performed on 90 core samples extracted from 30 different rock boulders collected from the neighboring area of Umm al-Jimal, a historic city in northeastern Jordan. Non-destructive LRHs can be used as indictors for evaluating both UCS and Et during the restoration of the historic city Umm al-Jimal and the rehabilitation of other existing structures. The UCS test is a destructive, expensive, and time-consuming method as reported by many researchers [9,10,11,12,13,14] For these reasons, the correlation between UCS and Et with the non-destructive or simple tests that require no sample preparation is more desired [15,16,17]. Different empirical models have been developed to estimate the UCS and Et depending on simple or non-destructive tests. Many researchers have developed numerous correlations between Schmidt hammer hardness, either linear or non-linear, and UCS and Et for diverse types of rocks [25,26,27,28,29,30,31,32,33,34,35]

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