Rebound Test Research Articles

산 종류에 따른 폴리우레탄 탄성체의 합성

Azelaic acid, sebacic acid, succinic acid와 1,3-propanediol(1,3 PD)를 병용하여 바이오 폴리에스터 폴리올을 합성하였다. 합성한 폴리올에 사슬연장제 없이 MDI(4,4"-methylenebis(phenyl isocyanate))를 1:1.1 비율로 혼합하여 바이오 열가소성 폴리우레탄을 합성하였다. Poly(1,4-butylene adipate)를 폴리올로 사용하여 같은 비율로 MDI를 혼합하여 일반 열가소성 폴리우레탄을 합성한 후 물성을 비교하였다. 열가소성 폴리우레탄의 성분 및 구조를 분석하기 위해서 FTIR, TGA 및 GPC를 사용하였다. 고분자가공분석기(RPA)의 변형 스윕(strain sweep) 기능을 이용하여 열가소성 폴리우레탄의 점탄성을 분석하였다. Shore A 경도계, 볼 반발 탄성시험기, UTM을 사용하여 열가소성 폴리우레탄의 경도, ball rebound, 인장강도를 측정하였다. 또한 외부 환경 변화에 따른 인장강도 유지율을 통해 내열성, 내수성, 내화학성을 분석하였다. Sebacic acid와 1,3 PD에 의한 바이오 열가소성 폴리우레탄이 가장 좋은 점탄성과 기계적 물성을 보였다. 인장강도는 일반 열가소성 폴리우레탄에 비해 낮았지만, 외부 환경변화에 따른 유지율이 상대적으로 높았다. Bio-polyester polyol was synthesized by using azelaic acid, sebacic acid, succinic acid and 1,3-propanediol (1,3 PD). 4,4"-methylenebis(phenyl isocyanate) (MDI) was mixed in the ratio of 1:1.1 without chain extender to synthesize the bio-thermoplastic polyurethane (TPU). Poly(1,4-butylene adipate) was used as polyol and MDI was mixed at the same ratio to synthesize general TPU, and then physical properties were compared. FTIR, TGA and GPC were used to analyze the composition and structure of the TPU. The viscoelastic properties of the TPU were tested using the strain sweep function of the rubber processing analyzer (RPA). The hardness, ball rebound and tensile strength of the TPU were measured using a Shore A tester, ball rebound tester and UTM. In addition, heat resistance, water resistance, and chemical resistance were analyzed through the tensile strength retention ratio according to external environment change. The bio- TPU with sebacic acid and 1,3-PD showed the best viscoelastic and mechanical properties. The tensile strength was lower than that of general TPU, but the retention ratio change was relatively high according to the external environment.

An elastoplastic constitutive model for frozen sandy soil considering particle breakage

A series of triaxial compression tests of frozen sandy soil are carried out under five confining pressures (1 MPa, 4 MPa, 6 MPa, 8 MPa and 10 MPa) at –6 °C. By comparing the grain size distribution curves of frozen sandy soil before and after shearing, it is found that significant particle breakage can occur during triaxial shearing. Particle breakage changes internal structure of geomaterials and has a significant effect on their stress–strain relationships. In order to accurately describe the effect of particle breakage of frozen sandy soil on the stress–strain relationships, an elastoplastic constitutive model for frozen sandy soil considering particle breakage is proposed. Based on the energy balance equation established by Indraratna and Salim, the constant critical state stress ratio (Mcr ) in the energy balance equation is modified to the stress ratio (M) which changed with shear strain during the shearing process. A yield function, considering particle breakage, is proposed using the modified energy balance equation. The hardening law is determined based on the rebound test results of frozen sandy soil, and the associated flow rule is adopted in the model. Compared with experimental data, the model can well simulate the stress–strain relationships under different confining pressures for frozen sandy soil. Highlights The particle breakage characteristics of frozen sandy soil are studied. The energy balance equation considering particle breakage is modified to calculate the energy dissipation of frozen sandy soil. An elastoplastic constitutive model for frozen sandy soil considering particle breakage is proposed.

The Effect of Fire on Building Materials: The Case-Study of the Varnakova Monastery Cells in Central Greece

The evaluation of the fire impact on building materials is of great scientific and socio-economic importance since fire can result in materials’ chemical and mechanical alterations, which leads to structural stability problems of historical and/or modern construction. This highly increases the cost of rehabilitation interventions. The case study of the Byzantine Monastery of Panagia (Virgin Mary) Varnakova is an example of the fire effect on both historical and newer stone masonries. The Varnakova Monastery is a typical 19th century monastic complex and, during its long history, it has undergone multiple reconstructions after major catastrophic events that have taken place due to its strategic geographical position and its financial and spiritual significance for the region. The last big-scale renovation of the Monastery was conducted between the years 1992 to 2014. However, in January 2017, a devastating fire destroyed the largest part of the monastic cells’ quarter. In this work, a diagnostic study of the different construction phases’ materials comprising the masonries of the monastery cells in their present state is presented. The examination of a series of samples through analytical techniques, such as optical microscopy, X-ray diffraction, thermal analysis, and total immersion tests, along with the use of non-destructive techniques in situ, such as Infra Red Thermography, Digital Microscopy, and Schmidt Hammer Rebound tests, shed light on the preservation state and on the decay of the diverse building materials. In addition, the impact of the fire on their properties was investigated. The results reveal the diversity of the materials used in the historical masonries throughout the centuries, while the combination of analytical and non-destructive techniques demonstrates the damages induced by the fire.

End point determination for spent nuclear fuel drying operations

When spent nuclear fuel is being dried ahead of either interim storage or long term disposal it is necessary to be able to confirm that the required level of dryness has been achieved. This has typically involved a vacuum rebound test however this method has certain limitations in terms of both reliability of the result and also by introducing an additional step that is time consuming and depending on the drying system used requires additional equipment at high system cost. It would be preferable if the end point and requisite dryness could be confirmed from online data readings recorded during the drying process.This paper presents the results of a number of vacuum drying tests using a benchtop drying rig in which online dew point, temperature, pressure and mass flow rate readings were compared to the results of vacuum rebound tests.Mass flow rate, pressure and dew point readings all showed cliff edge behaviour as the drying process progressed. Flow rate provided a good indicator of progress however it was clear from the behaviour that the resolution of the instrument was not sufficient to confirm dryness. Neither pressure nor dew point readings alone were capable of indicating whether a test would be passed successfully however it was found that in combination an envelope existed in which a vacuum rebound test was always passed.Testing of the same techniques for flowed gas drying methods was limited due to the lack of a suitable way of confirming whether dryness was achieved however there was an indication that dew point measurements would be capable of confirming that a set level of dryness had been achieved.

A laboratory study of Equotip surface hardness measurements on a range of sandstones: What influences the values and what do they mean?

AbstractThe Equotip rebound tester is a simple, non‐destructive technique to measure the surface hardness of materials. Having a low impact energy gives the Equotip advantages over the commonly used Schmidt Hammer on weathered rock and stone. In this study we have investigated the influence of different parameters (sample size, moisture content and surface roughness) on the surface hardness values obtained from freshly cut blocks of four types of sandstone. In a series of laboratory experiments both Single Impacts (SIM) and Repeat Impacts (RIM) methods have been used with C and D probes (which have different impact energies). Our results show that whilst sample size is of great importance we find that smaller samples can be reliably evaluated than previously reported. Moisture contents are also found to exert a more important influence on both SIM and RIM results than previously thought, with up to 26% lower hardness values recorded on saturated vs dry sandstone. Conversely, we find that surface roughness (over Sz values of 100 to 800 microns) does not have a significant impact on SIM measurements collected using the D probe. Both SIM and RIM data are found to be good proxies for compressive strength and open porosity, with SIM data collected with the C probe showing the best fits. Data collected using 3D microscopy helps visualize and quantify the small impact marks created by the Equotip and confirms that these are much reduced when using the C vs D probe. The results highlight the benefits of the Equotip to studies of the nature and deterioration of sandstone, the need for careful evaluation of any confounding factors which might influence the values obtained, and illustrate the different advantages of C and D probes. © 2019 John Wiley & Sons, Ltd.

An Investigation of Plume Response to Soil Vapor Extraction and Hypothetical Drum Failure

Core Ideas Soil vapor extraction (SVE) wells are an effective interim remediation technique. Flow and transport modeling assists in evaluation of vapor plume behavior. Plume simulations assuming drum failure and SVE provide a framework for remediation planning. A small borehole subset could be monitored for detection of VOC releases due to drum failure. Soil vapor extraction (SVE) has been used at sites across the Department of Energy complex, including sites where legacy subsurface wastes represent a potential source of groundwater contamination. At Los Alamos National Laboratory (LANL), leakage from waste drums buried at an inactive chemical waste site has created a subsurface vapor plume of volatile organic compounds (VOCs). Soil vapor extraction operation in 2015 and rebound testing through 2017 were successful in reducing the plume's mass and mitigating VOC migration toward the water table. However, the possibility that waste drums could fail and release VOCs could pose a challenge in the future. To explore the impacts of drum failure, as well as the capabilities of SVE remediation, we simulated hypothetical contaminant release scenarios and subsequent SVE remediation. Three‐dimensional subsurface VOC behavior, including advection, diffusion, and plume interactions with topography, were simulated using the porous flow simulator Finite Element Heat and Mass Transfer. Simulations of future site conditions have allowed identification of “sentry” boreholes that can be monitored for early detection in case of drum failure. Sentry boreholes can also be used to set concentration thresholds above which SVE should be initiated. For the LANL site, simulations show that SVE can be started 3 yr following drum failure and remain a viable remediation tool. More broadly, the principles outlined in this work can be used to support remediation planning at other subsurface waste sites. Predictive models of future releases can be analyzed to set concentration threshold values, guide selection of sentry boreholes, and increase operational efficiency.

Impact Energy Consumption of High‐Volume Rubber Concrete with Silica Fume

Adding rubber to concrete aims to solve the environmental pollution problem caused by waste rubber and to improve the energy absorption and impact resistance of concrete. In this paper, recycled rubber particles were used to replace fine aggregates in Portland cement concrete to combine the elasticity of rubber with the compression resistance of concrete. Fine aggregates in the concrete mixes were partially replaced with 0%, 20%, 40%, and 60% rubber by volume, and the cement in the concrete mixes was replaced with 0%, 5%, and 10% of silica fume by mass. The properties of the concrete specimens were examined through compressive strength, splitting tensile strength, flexural loading, and rebound tests. Results show that the compressive strength of concrete and the splitting tensile strength decreased to 11.81 and 1.31 MPa after adding silica fume to enhance the strength 37.8% and 23.7%, respectively, and the dosage of rubber was 60%. With the addition of rubber, the impact energy of rubberized concrete was 2.39 times higher than that of ordinary concrete, while its energy absorption capacity was 9.46% higher. The addition of silica fume increased its impact energy by 3.06 times, but the energy absorption capacity did not change significantly. In summary, the RC60SF10 can be used on non‐load‐bearing structures with high impact resistance requirements. A scanning electron microscope was used to examine and analyze the microstructural properties of rubberized concrete.

Issues in Engineering Geological Classification of Weathered Sedimentary Rocks: Case Study of Kati Formation, Parit, Perak

Kati Formation consists of alternating layers of sandstone, siltstone and mudstone that results in non-uniform weathering. The presence of surficial features due to weathering such as iron bands, iron recementation, iron staining and lithobionts coating in an uneven distribution on the outcrop causing more complexity to the heterogeneous sedimentary rocks which are also tectonically deformed. The presence of iron recementation in highly weathered rocks causing the rock strength to be higher than the moderately weathered rocks. Thus, several laboratory tests are conducted in this study to characterise the weathered rocks which are uniaxial compressive strength (UCS), point load strength index, slake durability test, jar slake test and Schmidt hammer rebound test. Among the laboratory tests conducted in this study, slake durability index test, Id2 is the ideal test to characterise the rock samples of different weathering grades as it gives a large range of laboratory test results which is 0.3 % to 15.0 % for completely weathered, 22.0 % to 67.0 % for highly weathered, 68.0 % to 83.0 % for moderately weathered and 87.0 to 98.0 % for slightly weathered to fresh rocks. The values obtained are not affected by the uneven distribution of iron oxide present in the rock samples.

A Nondestructive Evaluation Approach to Characterize Tennis Balls

Sometimes, nondestructive evaluation (NDE) or structural health monitoring methods commonly used in engineering structures are used for the betterment of consumer goods. A classic example is the use of sensor systems to monitor the pressure and the quality of car tires. In this paper, we present a nondestructive method to characterize tennis balls. The International Tennis Federation (ITF) specifies which characteristics a tennis ball must have in order to be commercialized. One of these characteristics is bounciness and the standardized method to measure it is the rebound test, where a ball is released from 2.54 m onto a smooth rigid surface and, in order to be approved, the ball must bounce within a certain range. This test can be staged by manufacturers and testing authorities but the equipment necessary to perform it is not readily available to the average consumer. In the study presented in this paper, an empirical method based on the propagation of highly nonlinear solitary waves (HNSWs) is proposed to establish whether a given ball conforms the specifications set by the ITF in terms of bounciness and allowed deformation. The experiments conducted in this study aim to discover a correlation between some features of the waves and the values obtained with the rebound test and the compression test in which the deformation of the ball under a known load is measured. The presence of such correlations could represent a viable alternative to establish the conformity of tennis balls. Based on the empirical evidences collected in this study, a possible new standard is suggested.

Solitary Waves to Assess the Internal Pressure and the Rubber Degradation of Tennis Balls

Rubber is a material present in many commodities, including tennis balls. The characteristics of tennis balls are specified by the International Tennis Federation and are evaluated using standard tests that are too cumbersome to be staged easily and quickly. In this article we present an experimental method based on the propagation of highly nonlinear solitary waves (HNSWs) to determine the internal pressure of tennis balls and to estimate rubber degradation. HNSWs are compact waves that can form and travel in a closely-packed assembly of systematically arranged particles that generally interact according to the Hertz contact law. In the study presented here, we developed a model that predicts the internal pressure of tennis balls and estimates rubber degradation by observing the waves propagating within a chain in contact with the ball to be estimated. The model was validated experimentally, by testing 18 identical balls played over a few weeks period. We found that the dynamic interaction between the waves and the rubber can successfully detect changes in internal pressure and bouncing characteristics and that these changes were barely detected using a conventional rebound test. In the future, the findings of this study may be expanded to characterize any rubber of any shape.

Testing of concrete by rebound method: Leeb versus Schmidt hammers

Hardness is considered as an important property of concrete; it can be used to estimate compressive strength of concrete in situ. The classic Schmidt rebound hammer is the most popular nondestructive method to measure concrete surface hardness, while the Leeb rebound hammer has been extensively studied in geological and metallographic fields over decades, and its use for testing concrete is almost not known. The national and international standards for the measurement of hardness are reviewed. Concrete made different w/c ratios (0.33, 0.4 and 0.5) were tested by both methods. The simple linear correlation between rebound numbers (both Schmidt and Leeb) and concrete compressive strength are proposed. Schmidt rebound number was differently correlated with compressive strength for concretes with different w/c ratios, while the Leeb rebound numbers were more consistent and could be applied in predicting concrete compressive strength within 10% error for all w/c ratios. It was also concluded that Schmidt test can be considered as a semi-destructive method, because of significant strength reduction (in average by 10.5 MPa) that was observed after application of Schmidt hammer impact on specimens, while the Leeb rebound test procedure did not result in any damage of concrete. This difference can be explained by the dramatic difference in impact energy of the two hammers (2207 and 11 N·mm - for Schmidt rebound hammers of N-type and Leeb hammers of D-type, respectively). Moreover, the classic Schmidt rebound hammer is not recommended to be used on the concrete specimens, which are aimed for compressive tests at early age (less than 3 days) or when expected compressive strength is less than 7 MPa. These constraints do not apply to lower impact Leeb rebound devices, which can be considered as perfectly invasive (non-destructive). At the same time, as expected, Leeb rebound test is sensitive to the surface conditions, such as carbonation and surface moisture.

Estimating the uniaxial compressive strength of rocks with Schmidt rebound hardness by considering the sample size

The Schmidt hammer is commonly used for the prediction of unconfined compressive strength and other mechanical properties of rocks from surface rebound hardness values since it is quick, easy, inexpensive, and non-destructive testing method. In this study, metamorphic, sedimentary, and igneous rock samples were collected from various locations in Turkey to predict the rock strength from Schmidt rebound hardness. Schmidt rebound tests were performed on cubic samples with an edge length of 11 cm and uniaxial compressive strength tests were carried out on cubic samples with an edge length of 5 cm in accordance with ASTM and EN standards and suggested procedure by ISRM. New relationship coefficients between unconfined compressive strength and Schmidt rebound hardness values were suggested according to rock type. Finally, some diagrams were developed to be practically used for estimating the uniaxial compressive strength from Schmidt rebound hardness values by considering the sample size obtained from the experimental work.

Trial of Low-Temperature and High-Temperature Hardness Testing Using the Small-Ball Rebound Test eNM3A10

The small-ball rebound hardness test measures the coefficient of restitution (rebound hardness) of a sample by shooting a 3 mm diameter alumina ball indenter at a speed of 10 m/s and measuring the rebound speed. The obvious advantages of this test are a remarkably small “mass effect” and satisfaction of the similarity rule of hardness. In addition, the test is also considered suitable for measuring high- and low-temperature hardness because the indenter comes into contact with the specimen only for an extremely short time.For this application, samples made of steel were cooled and heated to various temperatures ranging from –196ºC to 1000ºC. It was found that there was no damage to the tester or the indenter, making it possible to easily perform reproducible low- and high-temperature rebound hardness tests.

Analysis of Schmidt hammer rebound test results with repetitive impacts for determining the mechanical characteristics of weathered pyroclastic rock surfaces: a case study along the Isotake coast, Japan

Cliffs located along the Isotake coast, Shimane, Japan, are characterized by the development of indents without rockfalls and by the occurrence of rockfalls without indents—even though these cliffs have the same geology. An analytical method was developed to determine the mechanical properties of the rock surfaces of a coastal cliff. Twenty continuous impact repetitions of a Schmidt hammer were applied normal to the cliff surfaces in each test. The results of the tests (26 with indents and 22 without indents) showed a gradual increase in the rebound value with increasing number of repetitions. A new exponential equation was proposed in this study to describe the features of the weathered surfaces. The changes in the results were well approximated by this equation, and the approximation clearly distinguished between the two types of weathered surfaces, with higher rebound values at the surfaces of the cliffs with indents than at the surface of cliffs without indents. The homogeneity and heterogeneity of the surface and inner body of the cliff rock can also be modelled by the coefficients in this equation.

Experimental determination of the initial compressive strength of concrete using a rebound test hammer

This paper deals with rebound hammer testing of concrete in the early stage of ageing. Six types of concrete were produced for the purpose of the presented experiment and differed in the water/cement ratio and were otherwise identical as to the input components. SilverSchmidt PC L test hammer was used to determine the rebound coefficient Q and compressive strength of cube test specimens. The aim of the experiment was to verify the possibility of creating a conversion relationship between the determined parameter of the used non-destructive method and the real compressive strength of concrete in the first days of ageing of concrete. Based on the conducted experiment, it may be stated that the SilverSchmidt PC L test hammer with a mushroom plunger is a suitable instrument for determining the initial compressive strength of concrete, starting from the value of about 5 N/mm2. An important conclusion is the fact that it is possible to create a regression model with relatively high accuracy, in this case approximately ± 3 N/mm2.

Strength and impact resistance properties of concrete containing fine bone china ceramic aggregate

This article examines the mechanical and impact resistance properties of concrete incorporating fine bone china ceramic aggregate. Three different concrete mixes with varying water-to-binder ratios containing different substitutions (0%, 20%, 40%, 60%, 80% and 100%) of fine bone china ceramic aggregate as fine aggregate were prepared. The mechanical properties such as compressive strength, split tensile strength, flexure strength and modulus of elasticity were evaluated. The impact resistance of concrete containing 40% fine bone china ceramic aggregate was measured by a drop weight test and rebound test. The microstructure of the concrete mixes was examined via a scanning electron microscope. The inclusion of fine bone china ceramic aggregate in concrete leads to enhanced mechanical strength and impact resistance properties. The microstructure of the fine bone china ceramic aggregate concrete showed enhanced formation of hydration products.

The Importance of Scientific Tests In Masonry Heritage Building Conservation In Malaysia

Since the Portuguese era in Malacca in the 16th century, many authentic colonial heritage buildings were built in Malacca and other parts of Malaysia, most of which were masonry structural buildings. After Melaka and George Town received recognition from UNESCO as World Heritage Sites on 7th July 2008, heritage building conservation in Malaysia has attracted serious attention from various parties. Since the establishment of the National Heritage Department under the National Heritage Act 2005 (Act 645) on 1 March 2006, the implementation of scientific tests in heritage building conservation practice in Malaysia has been encouraged and recommended by the Department. However, scientific tests are normally only conducted in conservation works of National Heritage buildings and some Category I heritage buildings, but not made compulsory for all heritage buildings conservation projects in Malaysia. This paper is based on a research carried out to study the scientific tests conducted in masonry heritage building as part of conservation practice in Malaysia. The research findings revealed that scientific tests such as X-ray fluorescence test, ion chromatography test, moisture test and Schmidt hammer rebound test are important for masonry heritage building conservation in Malaysia. The basic guidelines to conduct the scientific tests derived from the research findings will be able to enhance the current practice in conserving masonry heritage buildings in Malaysia.

Destructive and Non Destructive Strength Evaluation of Concrete Exposed to Fire

In this investigation concrete of different compressive strength is exposed to fire for various duration similar to natural fire occurring in buildings. A total of 72 Concrete cubes have been cast from three different concrete mixes then exposed to fire up to 10000C for three different durations (15,30 and 60 minutes) then tested using non- destructive methods like hammer rebound test and Ultra-Sonic Pulse velocity test. Then the cubes were tested to destruction to measure their compressive strength. The results have shown that the unit weight, compressive strength and actual residual strength decreases with the increase of firing exposure duration similar to concrete exposed to steadily rising temperature. The correlation between the cube compressive strength and RN of the hammer test is very close, however the correlation coefficient of the cube strength with the UPV results is less. Using the combined method of the NDT, the relation between the cube strength and the NDT improves. Equations of relation betweencompressive strength and NDT tests are proposed for use in practice.

Model test of soil deformation response to draining-recharging conditions based on DFOS

Intense groundwater exploitation and seasonal fluctuations of water level in phreatic aquifer cause land subsidence disasters. To better understand the land subsidence mechanism caused by groundwater withdrawal, a small-scale sand-clay interbedded model box was built to carry out consolidation and rebound tests during two drainage-recharge cycles. Distributed fiber optical sensing (DFOS) technologies were introduced for coupled monitoring of soil strain and water content to analyze response characteristics of each layer to water level changes. The results indicate that soil layers were compressed during drainage and rebound during recharge, with clay layer deformation more obvious than sand layer deformation. Deformation of the sand layer was synchronous with water content changes, while that of the clay layer lagged behind water content changes due to its lower permeability coefficient. The segmented compression clay layer curve shows that the water content rapidly decreased when it was lower than the liquid limit, while the clay layer compression rate obviously accelerated during drainage. When the water content was higher than that of the liquid limit during recharge, the rebound rate significantly increased. Under the condition of repeated drainage and recharge, the soil microstructure changed with decreasing porosity and permeability coefficient, leading to a longer consolidation time. With increasing cycling times, the soil gradually tended toward elastic deformation. The observations propose a novel technology, DFOS technology, for monitoring land subsidence caused by seasonal water level fluctuations and dewatering projects. The test results are of great significance to investigate land subsidence mechanisms and evaluate soil layer compression potential.

Uniaxial Compressive Strength of Antarctic Peninsula Rocks: Schmidt Hammer Rebound Test

The uniaxial compressive strength test is a destructive and time consuming test. A number of non-destructive methods using portable testing equipment are more applicable and easier to conduct. This paper presents the results of a systematic approach to determine the uniaxial compressive strength of rock material using the Schmidt hammer rebound test. A total of five distinct locations (Graham Coast, Davis Coast, Nanson Island, Danco Coast and Trinity Island) were tested using the Schmidt rebound hammer test. Peninsula Antarctic located at northwest of Antarctic region comprising of igneous and metamorphic rocks. Statistical analysis of the results at 95% confidence level showed the Schmidt rebound value of the Graham Coast ranges from 40±1.7 to 41±1.3 with standard deviation of 8.2 to 6.4. The rebound value for Davis Coast was 39±1.6 with standard deviation of 7.7. Rocks from Nanson Island and Danco Coast have the Schmidt rebound value of 54±1.7 with standard deviation of 8.0 and 36±1.3 with standard deviation of 6.2, respectively. The Schmidt rebound value of rocks at Trinity Island ranges from 29±1.4 to 32±1.7 with standard deviation of 6.8 to 8.1. Thus, the respective uniaxial compressive strengths of rock materials from Graham Coast, Davis Coast, Danco Coast, Nanson Island and Trinity Island were 73-108, 50, 59, 164 and 45-59 MPa. The respective ISRM strength classification of rock materials of Graham Coast, Davis Coast, Danco Coast, Nanson Island and Trinity Island were strong (R4) to very strong rock (R5), medium strong rock (R3), strong rock (R4), very strong rock (R5) and medium strong (R3) to strong rock (R4). The results showed a mean of quantification of rock material strength based on the Schmidt Hammer rebound test in Antarctic Peninsula.