Rebound Hammer Test Research Articles

Mechanical Properties of Blast Furnace Slag and Rice Husk Ash with Coconut Shell as Partial Replacement of Aggregates

This research showed the application of concrete material in construction industry were highly demand which growing rapidly demonstrate the need for various types and properties of concrete to meet the diverse needs of the user. Normally, the quality of concrete with high durability properties can be generated by consideration of the composition of the materials used such as cement, sand, aggregates or water. Besides that, mix design and the way of production like mixing, transporting and pouring concrete is also the factors to get a better quality of concrete. Recently, the sustainability in construction is one of the efforts that have been practiced by developed countries to create healthier environment and to reduce the environmental impact of a building over its entire lifetime, while optimizing its economic viability and the comfort and safety of its occupants. One of the steps that can be practice is to use materials that are categorized as agricultural waste material such as palm oil fuel ash, rice husk, fly ash slag, sludge, coconut shell and etc. in concrete manufacturing. Hence, the objective of this paper is to evaluate the performance of blast furnace slag, rice husk ash and coconut shell as partial replacement of aggregates in cement. A series of test were conducted to investigate the performance of blast furnace slag, rice husk ash and coconut shell as partial replacement of aggregates in cement. The tests that are being conducted are compressive strength test, flexural strength test, rebound hammer test, ultrasonic pulse velocity test, water permeability test, sieve analysis test, water absorption test, carbonation test, alkali-silica reaction test, SEM test and shrinkage test.

Utilisation of crumb tire rubber in development of sustainable metakaolin based high strength concrete

Environmental protection necessitates induction of 3R (recycle, reuse, reduce) principle into the construction sector. The study investigated fresh, strength properties, and SEM/XRD analysis of high strength concrete containing 15% metakaolin and crumb rubber up to 30% as sand replacement upto 90 days. SonReb method was used to determine relationship of Ultrasonic Pulse Velocity and Rebound Hammer tests with compressive strength. Results indicate loss of workability, density, compressive strength, split tensile strength and modulus of elasticity but improved ductility at 20% crumb rubber replacement which depicted highest toughness index. Equation derived from SonReb method predicted compressive strength with reliable accuracy.

A Case Study on Condition Assessment of Fire-Damaged RC Members of Turbo-Generator

Many researchers across the globe have carried out fire safety risk analysis to gather evidence and pertinent data for different Reinforced Cement Concrete (RCC) members exposed to fire. Assessment of fire-damaged structures furnishes the minute details of the effect of fire on the properties of concrete.The study indicates the condition assessment of the turbo-generator (TG) unit, comprises of concrete bearing pedestals, deck and supporting columns. The research was conducted using Non-Destructive Testing (NDT) techniques using Rebound hammer test, Ultrasonic Pulse Velocity (UPV) test, Concrete Cover measurement, Carbonation and Crack depth measurements followed by microstructural studies using an X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Optical Microscope (OM), and Mercury Intrusion Porosimetry (MIP). The samples were taken from a fire-damaged concrete bearing pedestal B2 and a non-fire-damaged concrete bearing pedestal B4 of the TG unit. The approach enabled us to find the extent of damage to the RCC members exposed to fire. The above mentioned test witnessed that the concrete bearing pedestal B2 was the moderately distressed member, expressed doubtful quality of concrete, higher porosity, reduced residual compressive strength and reduction in yield strength of steel. However minor distress in form of crushing at the top grout portion was observed in concrete bearing pedestal B4, and no apparent distress was observed in supporting columns of TG unit. Based on the distress identified, repair and remedial measures were proposed to concrete bearing pedestals in order to improve the performance of the TG unit.

Destructive and Non-Destructive Testing of the Performance of Copper Slag Fiber-Reinforced Concrete.

Concrete technology is adopted worldwide in construction due to its effectiveness, performance, and price benefits. Subsequently, it needs to be an eco-friendly, sustainable, and energy-efficient material. This is achieved by replacing or adding energy-efficient concrete materials from industries, such as ground granulated blast furnace slag, steel slag, fly ash, bottom ash, rice husk ash, etc. Likewise, copper slag is a waste material produced as molten slag from the copper industry, which can be used in concrete production. Copper slag can perform roles similar to pozzolans in the hydration process. This paper extends the comparative study of copper slag concrete with polypropylene fiber (PPF) subjected to destructive and non-destructive testing. Under destructive testing, compressive strength of concrete cubes, compressive strength of mortar cubes, splitting tensile tests on cylindrical specimens, and flexural tests on plain cement concrete were conducted and analysed. Ultrasonic pulse velocity and rebound hammer tests were performed on the samples as per IS13311-Part 1-1992 for non-destructive testing. The 100% replacement of copper slag exhibited a very high workability of 105 mm, while the addition of 0.8% PPF decreased the flowability of the concrete. Hence, the workability of concrete decreases as the fiber content increases. The density of the concrete was found to be increased in the range of 5% to 10%. Furthermore, it was found that, for all volume fractions of fiber, there was no reduction in compressive strength of up to 80% of copper slag concrete compared to control concrete. The 40% copper slag concrete was the best mix proportion for increasing compressive strength. However, for cement mortar applications, 80% copper slag is recommended. The findings of non-destructive testing show that, except for 100% copper slag, all mixes were of good quality compared to other mixes. Linear relationships were developed to predict compressive strength from UPV and rebound hammer test values. This relationship shows better prediction among dependent and independent values. It is concluded that copper slag has a pozzolanic composition, and is compatible with PPF, resulting in good mechanical characteristics.

Effect of Posidonia oceanica Fibers Addition on the Thermal and Acoustic Properties of Cement Paste

The present work focused on the experimental study of the mechanical, thermal and acoustic properties of cement composite reinforced using Posidonia oceanica (PO) fibers. For this purpose, parallelepipedic specimens of dimensions 270 mm × 270 mm × 40 mm and cubic specimens of dimensions 150 mm × 150 mm × 150 mm were prepared with a water-to-cement ratio of 0.50 by varying the volume of fibers (Vf) from 0% to 20%. Properties such as compressive strength, thermal conductivity, thermal diffusivity, standardized level difference and sound transmission class were examined. The compressive strength of the specimens was determined using the rebound hammer test, while the thermal measurements were performed with the steady-state box method. The results showed that the addition of PO fibers improved the compressive strength of the mixtures and produced a maximum value of 33.60 MPa for a 10% volume of fiber content. Thermal conductivity and thermal diffusivity decreased significantly with the addition of fibers for all the mixtures. The experimental investigation also showed that the sound transmission class of PO-fiber-reinforced cementitious composites decreased as the fiber volume increased due to an increase in air voids in the mixtures.

Destructive and Non-Destructive Evaluation of Fibre-Reinforced Concrete: A Comprehensive Study of Mechanical Properties.

Ultrasonic pulse velocity (UPV) and rebound hammer tests are accepted as alternatives to destructive testing to determine the compressive strength, dynamic modulus of elasticity, and Poisson’s ratio, which are needed for structural design. Although much work has been conducted for plain concrete, the research data for fibre-reinforced concrete (FRC) is insufficient. In this regard, this study explains the correlations between compressive strength, rebound hammer, and UPV tests for plain concrete and FRC contains 0.25%, 0.50%, and 1.00% of 30 mm and 50 mm long steel fibres. A total of 78 concrete cube and beam specimens were tested by direct, semi-direct, and indirect UPV and rebound hammer test methods. The study found that the rebound hammer test is more suitable for measuring the compressive strength of matured FRC than young concrete. The UPV test revealed that the volume fraction does not, but the length of steel fibres does affect the UPV results by the direct test method. The UPV direct method has the highest velocity, approximately two times the indirect velocity in FRC. UPV measurements can be effectively used to determine the dynamic modulus of elasticity and Poisson’s ratio of FRC. The dynamic elastic modulus increases while the Poisson’s ratio decreases for the same steel fibre length when at increasing FRC fibre content. The results of this study will be significant for non-destructive evaluations of FRC, while additional recommendations for future studies are presented at the end of the paper.

Correlation models for utilising rebound hammer technique in evaluating weathered limestone walls

ABSTRACT Rebound hammer (RH) is a non-destructive testing (NDT) technique that has a significant role in the field assessment of ancient and modern buildings made of natural stones. This study aims to establish correlation models for utilising the RH technique in evaluating weathered limestone walls and to provide an efficient in-situ assessment. Compressive and RH tests were conducted for four types of building limestones: Ruwaished Hard, Ruwaished Soft, Hallabat, and Ma’an, including nine specimens for each type with dimensions of 15 × 15 × 15 cm and two real-scale weathered stone walls with dimensions of 100 × 200 cm. Based on the experimental tests, regression analyses were conducted between the RH values, compressive strength, and modulus of elasticity. The established power-based correlation models had high coefficients of determination. For validation purposes, real-scale weathered stone walls were evaluated using the RH test, the mechanical properties were underestimated and affected by Stone Units’ surface roughness and weathering degrees. However, the established models give conservative estimations and can be used with sufficient accuracy for an in-situ evaluation of limestone structures. Further investigations are necessary to enhance models’ validity for various stone types by combining other NDTs and considering different weathering factors.

Structural assessment of the historic Ten Arches Bridge in Jordan

ABSTRACT The Ten Arches Bridge is a historical stone bridge that is located in Amman, Jordan. The bridge has a valuable cultural heritage as it was built in 1908 to serve the Hejaz Railway Line. This study presents a structural assessment of the bridge including a field inspection, experimental investigation, and numerical structural analysis. The study also investigates the efficacy of utilizing in-situ Non-Destructive Testing (NDT) such as Rebound Hammer (RH) and Ultrasonic Pulse Velocity (UPV) tests in the assessment of stone arch bridges. Detailed experimental and numerical investigations were performed to identify the structural integrity of the bridge by evaluating the acting stresses and displacements under static and dynamic loads. Minor deteriorations were found in the bridge’s body due to human and environmental factors. However, the geometrical properties of the bridge have not been significantly changed. The obtained results of the numerical analysis concluded that the bridge can sustain the current imposed dead and traffic loads, but not serve seismic actions. Compressive strength and modulus of elasticity of stone units obtained by RH and UPV tests are in agreement with the laboratory tests. Accordingly, NDT techniques can provide and verify basic mechanical properties that are needed for numerical analyses.

An aggregated non-destructive testing (NDT) framework for the assessment of mechanical properties of unreinforced masonry Italian medieval churches

Medieval churches constructed of unreinforced masonry (URM) represent critical assets of Italian architectural heritage. In order to preserve these churches against earthquakes, obtaining robust information regarding their material mechanical characteristics is necessary as part of a reliable structural analysis and strengthening intervention program. Given the drawbacks of semi-destructive or destructive testing of heritage material, non-destructive testing (NDT) is the most viable approach to obtain data regarding the mechanical characteristics of the material composing the structure of the churches. However, there are several uncertainties inherent within NDT techniques based on the current state of the art. Thus, two different NDT techniques (i.e., rebound hammer testing, and pulse velocity testing) and two expert judgment-based investigation techniques (i.e., masonry quality index, and mechanical properties ranges based on the Commentary to the Italian building code) were applied to 170 specimens belonging to the walls of 72 URM Italian medieval churches to assess the quality of the URM and its components. The surveyed churches walls, although highly variable in geometry, materials, and conditions, can be classified into four URM types: a) irregular stone masonry with pebbles, erratic and irregular stone units; b) roughly cut stone with good bond; c) ashlar masonry with regular squared blocks and mortar joints; and d) solid fired clay bricks with lime mortar. Subsequently, using the SonReb technique, predictive equations that aggregate the two NDT techniques and the correlation coefficient specific for each URM type were developed to define some of the critical mechanical properties of the URM (i.e., compressive strength, Young’s modulus, and shear modulus). The mechanical properties determined via predictive equations were then plotted and compared with the predictions of the two well-established expert judgment-based investigation techniques to evaluate the accuracy of the approach. Finally, a partial validation based on NDT and destructive testing techniques of six URM prisms was performed to evaluate the accuracy of the proposed predictive equations. Ultimately, three equations to determine the compressive strength, the Young’s modulus, and the shear modulus were developed. The developed equations offer to engineering practitioners a rapid NDT technique to assess URM properties that do not solely rely on the judgment and expertise of the practitioner.

Inspection of bridges for effects of air-entrainment on the porosity and compressive strength of concretes

Air entrained concrete is used for outdoor structures in cold climate to enhance freeze-thaw resistance. A well dispersed air void system is incorporated in the fresh concrete, consisting of spherical air voids that provide expansion space for freezing water and thus act as pressure-relief. The amount of air entrainment (AE), which results from adding an air entrainment agent to the fresh concrete during mixing, needs to be controlled so as not to significantly reduce the strength of the hardened concrete. Excessive AE has been reported in some bridge concretes in Finland, triggering a comprehensive inspection of 96 bridges. The paper describes the testing methodologies used in this case-study of comprehensive national bridge-inventory level inspection, assess the main findings (compressive strength and porosity), and concludes on the lessons learned concerning the effectiveness of inspection methods. The large dataset of concretes, presented here, was treated statistically. The amount of AE in hardened concrete had been steadily increasing in recent years Salparanta et al. [1]. The study shows the importance of a representative number of samples when conducting inspections and found that the use of rebound hammer and core testing correlation to establish additional in situ strength measurements led to overly conservative results. It was verified that the immediate safety of the inspected bridges was not in question, and that a re-evaluation of the safety margins and special maintenance protocols may be required to assure adequate long-term service life for some of the bridges that exhibited exceptionally high AE.

Strength and Durability Assessments of Induction Furnace Slag - Quarry Dust -Based High Performance Self - Compacting Concrete

Abstract Induction furnace slag (IFS) and quarry dust (QD) were reported as good materials in making ordinary concrete. Studies were not done on utilizing IFS and QD as constituents of high-performance-self-compacting-concrete (HPSCC). This study aims at assessing the effects of induction furnace slag and quarry dust on the strength and durability of high-performance self-compacting concrete. Strength tests including compressive, flexural, split tensile, rebound hammer tests were conducted on HPSCC. Likewise, durability tests including water absorption, total porosity and electrical resistivity tests were conducted. IFS at 0 % to 50 % (at 10 % intervals) replacement with Portland cement was used. Also, the optimum IFS content was combined with QD at 0 % to 50 % (at 10 % intervals) replacement with river sand. The results revealed an increment in strength up to 20 % IFS, 50 % QD with a rise of 15.34 % compressive strength over the control. The durability improved up to 20 % IFS, 60 % QD with a rise of 16.86 % electrical resistivity over the control. These showed that IFS and QD can be used for the production of HPSCC.

The Performance of Empirical Laws for Rebound Hammer Tests on Concrete Structures

The assessment of concrete compressive strength plays a key role in the analysis of the seismic vulnerability of existing buildings. However, the adoption of classical destructive tests is usually limited by their invasiveness, cost and time needed for the execution. Thus, in order to overcome these limits and allow investigations to be extended to a large number of points, the use of the rebound hammer test is investigated here with a detailed analysis of the effects on the accuracy of the strength assessment related to the choice of the conversion model relating rebound index to compressive strength. The analysis has been performed by comparing several empirical laws calibrated with data acquired in an experimental investigation of an existing concrete building. The relationships between the coefficients of the examined conversion models are then established, with the aim of reducing the unknowns in the calibration procedure. Furthermore, the influence of the coefficients of variation of concrete strength and rebound index on the results of the calibration procedure has been analyzed, thereby supporting the assessment of the accuracy of the concrete strength.

Study Regarding the Evaluation of Prediction Models for Determining the Concrete Compressive Strength Using Non-Destructive Testing (NDT) Data: Validation Stage

In the evaluation of an existing reinforced concrete structure, a fundamental issue is determining the concrete compressive strength as accurately as possible. This process can be conducted by using destructive and non-destructive methods. The destructive method presumes a limited number of cores extracted from the concrete structure. A higher number of cores would affect the structural safety and is time and resource consuming. Therefore, the conclusions drawn using exclusively this method can also generate errors in correctly estimating the load bearing capacity of a structure, thus leading to the possibility of implementing deficient measures in order to ensure a structural safety. Data obtained via non-destructive methods are more comprehensive. Due to their non-destructive nature, there are no limitations regarding the number of elements investigated and are fast in delivering results. One of the main concerns of researchers in this field is developing a direct relationship between the measured indicators through non-destructive testing (NDT) methods and concrete compressive strength. Over the years different equations with different mathematical structure (linear, polynomial, power, exponential and logarithmic) were developed with the main purpose of delivering fast and accurate results concerning concrete compressive strength by the means of NDT. The aim of this paper is to validate some of the most important prediction models using an original set of data. The database consists in a number of 96 concrete cores that were subjected to Ultrasonic Pulse Velocity (UPV) and Schmidt Rebound Hammer (SRH) testing. The accuracy of the results was determined by using two statistical parameters the mean absolute error (MAE) and mean absolute percentage error (MAPE). The proposed equations have been analyzed in terms of prediction and dispersion of values. It was noticed that some of the formulations predict values that are higher than the ones obtained destructively, others provide a larger dissipation of values, while some equations deliver a compact distribution of results with higher rate in terms of accuracy. This study proposes a data validation of some of the most popular empirical equations, used for the estimation of the concrete compressive strength, elaborated through the years, using a new set of data.

Structural Audit of RCC Structure.

The Government Agency like Municipal Corporation must issue the notices to such buildings/ structures which are having age more than 30 years. Mostly the maintenance is ignored in many structures which may cause some severe problems. Health and performance of buildings also depends on the maintenance of structure which plays a great role. Thus, Structural Audit of such type of buildings is necessary and timely maintenance /repairs also important. This will lead to prolonged life of building and safety of occupants. It also emphasizes on different repairs and retrofitting measures to be used for buildings after structural audit. Structural Audit is an overall health (strength assessment) and performance checkup of a building. It analyzes the strength and then suggests repair and retrofitting for the building to improve the service life of the structure. Enhance the life of the building by suggesting some preventive repairs. An old building with more than 15 years should be selected for structural Audit. And then the test should be performed on structure. Keywords- Structural Audit, Strength assessment, NDT, UPV Test, Rebound Hammer Test

Analysis of the Variation in Different Nondestructive Testing and Standards

Non Destructive Testing (NDT) methods are used to review or measure the materials or designs without annihilating their surface, item uprightness and future handiness. The overall objective of the research is to assess the strength of concrete in existing structures using Nondestructive Tests at Kachankawal Rural Municipality, Jhapa District of Nepal.Rebound hammer test and ultrasonic pulse velocity tests were used for determining the compressive strength of concrete. The existing Reinforced Concrete Cement culverts were used for 9 existing structures. Average rebound number were taken and calculated from each sample. From the average rebound number were taken to determine the grade of concrete along with corresponding compressive strength. Similarly, the Ultrasonic Pulse Velocity tests were done on same existing structures and path length and time were noted for assessing the corresponding compressive strength and the quality of concrete. Triangulation among rebound hammer test, ultrasonic pulse velocity test and proposed initial grading were validated using chi square test. Relation between compressive strength with rebound hammer and ultrasonic pulse velocity were analyzed using linear regression model. Chi square confirms variation in compressive strength between calculated compressive strength and standard compressive strength. The relation of compressive strength (y) at R² = 1 with rebound number (x) and ultrasonic pulse velocity (x) could be expressed as y = 0.9306x - 2.7233 and y = 2.904 x + 10.119 respectively. The study is a guiding tool for concern authority and professionals to make effective decision regarding further structural development and budget allocation of the existing structures.

Structural Audit of Cancer Hospital Building Sawangi (Meghe), Wardha

Now a Days we are designing RCC framed structure which is heart of building with consideration of factors and various and codes which is necessary and using different techniques to assess the old RCC framed Structure. In India, safety of old buildings is one of the major issues. As the strength of old hospital buildings get reduced in due course of time it creates structural defects such as unexpected over loading, material deterioration, physical damages or structural deficiency and if further utilization of such damaged structure is done, it may lead to serious damage of life and property. As Structural Audit of old building is mandatory as per municipal authorities and Government of Maharashtra has made "Structural Audit" of all old building compulsory As Prevention is better than cure, In this present dissertation we adopted Structural Auditing of Cancer hospital building which is situated at sawangi (meghe),Wardha (Maharashtra) is constructed in the year span of 1990-1992 So at the present scenario this building is 32 year Old and required to be checked in all aspect to Assure its safety. with Rebound Hammer Test, Ultrasonic Pulse Velocity Test, Half-cell test, pH and carbonation test including Visual Inspection and assessing the stability and safety of the structure to withstand for its remaining life by diagnosis and root cause of the problems by recommending strengthening and then retesting after strengthening is done to check the required strength which is expected.

Assessment of Woodcrete Using Destructive and Non-Destructive Test Methods.

Utilizing solid wastes and industrial by-products as a partial replacement for raw materials has become an acceptable practice among researchers and scientists in the civil engineering field. Sawdust and wood shavings are not an exception; they are being used in concrete as a partial or total replacement for some of its constituents. The main goal of this research is to establish a relation between destructive and non-destructive testing for concrete containing wood shavings as a partial replacement of sand (woodcrete). With this type of material existing, thus the need to understand the behavior of such material becomes urgent and evokes the need to ease the process of the assessment and the evaluation of such materials and therefore provide more understanding of its behavior. In addition to the conventional concrete mix, five mixes of woodcrete were made by replacing fine aggregate by volume with wood shavings at different replacement levels varied from 5% to 50%. Cubic samples were tested at the age of 90 days using nondestructive tests (NDT), namely, rebound hammer test and ultrasonic pulse velocity test. Then, the specimens were tested using a conventional compressive test using a universal compression testing machine. Statistical analysis was performed to establish empirical relations between destructive and non-destructive results. The dynamic modulus of elasticity was calculated, and some formulas to estimate the (compressive) strength of woodcrete using NDT results were proposed and tested against experimental results and showed acceptable results.

Assessment of high-temperature damaged concrete using non-destructive tests and artificial neural network modelling

Evaluation of high-temperature damaged concrete is crucial to ensure the safety of any structure after a fire event. However, using destructive tests, such as taking cores from the concrete, can be costly and dangerous; specifically for damaged structures. Therefore, it is preferred to use in-situ non-destructive testing (NDT) in the assessment of damaged concrete. The objective of this study is to develop an artificial neural network model, based on destructive and non-destructive testing results, to assess the concrete strength after being subjected to high-temperature levels; without the need for further in-situ destructive testing.The effect of high-temperature levels (200–800 °C) on concrete compressive strength was investigated in this study using destructive compression and non-destructive tests on concrete cubes; including ultrasonic pulse velocity and Schmidt rebound hammer testing methods. The results of destructive and non-destructive tests of damaged and undamaged concrete were found to be highly correlated. Therefore, the data of this study and data obtained from the cited literature were augmented together and used to optimise and train the artificial neural network model.The artificial neural network analysis indicated that concrete compressive strength (CS), the magnitude of high-temperature damage, and the level of exposure temperature can be predicted with reasonable accuracy using only a combination of non-destructive tests results. The model had a coefficient of determination equals to 0.944.

Experimental study on self-compacting concrete with replacement of coarse aggregate by light expanded clay aggregate

The present study deals with fresh and hardened concrete properties of self-compacting concrete while carrying several trial mixes with a variety of water binder ratio and super-plasticizer content and finally achieved a trail mix with satisfying the flow properties as slump flow, V-funnel, and L-box test apparatus values are obtained within the limits of European guidelines. This study was carried out on the properties of Lightweight self-compacting concrete (LWSCC) with a binder content of 517 Kg/m3. In the achieved proportion of the final trail mix, the coarse aggregate will be replaced by Light Expanded Clay Aggregate (LECA) by varying the different percentages of coarse aggregate as 0%, 10%, 20%, 30%, 40%, and 50% by volume replacement. The fresh concrete properties are determined, and the values were found in considerable range as per European guidelines by performing slump flow, V-funnel, and L-Box tests for various proportions (0%, 10%, 20%, 30%, 40%, and 50%) of LECA aggregates by replacing normal coarse aggregates. The hardened concrete properties are determined by performing Compressive strength, split tensile strength, ultrasonic pulse velocity, and rebound hammer tests after curing specimens for 7 days and 28 days. Results indicate that LECA replacement in SCC up to 30% gives fair results in split tensile & compressive strength. NDT results show values are gradually decreasing with an increase in LECA proportion. Beyond 30% of LECA replacement in SCC gives results of split tensile, compressive strength, ultrasonic pulse velocity, and rebound hammer tests which are not inconsiderable range.

Determination of some engineering properties of volcanic tuff using non-destructive method

Volcanic tuffs extracted from the quarries of Bayburt province in Turkey are of three different types locally identified as white, yellow and green Bayburt stones. This study was intended to estimate the compressive strength of white, yellow and green Bayburt stones by non-destructive testing methods. For this, non-destructive tests such as the nail penetration test (NPT), Schmidt rebound hammer (SRH) test and ultrasonic pulse velocity (UPV) test were performed. A uniaxial compression test was also performed so as to assess the accuracy of the results obtained from the non-destructive tests. For the NPT, nails manufactured for the gun having 27 and 39 mm length were used. In total, 45 nails were nailed and average the values were taken. Also, uniaxial compressive strength (UCS) and UPV tests were performed on 30 samples in total; furthermore, a total of 60 impacts for the SRH test were performed. The relationship between the results recorded from NPT and UCS, SRH and UPV was determined by regression analysis and comparison. The relative absolute errors between the measured values and the predicted values are below 4% for SRH-NPT comparison and below 9% for UPV-NPT comparison. This method of estimating the compressive strength, by using these non-destructive experiments, was appraised as suitable.