A simple and practical tool for indirect determination of the unconfined compressive strength of most common construction materials

Yıl 2024, Cilt: 173 Sayı: 173, 189 - 201, 26.04.2024

Kamil Kayabalı Turgay Beyaz İlknur Karaaslan Özdemir Deniz Yılmaz

https://doi.org/10.19111/bulletinofmre.1267931

Öz

Determination of the unconfined compressive strength (UCS) of construction materials in the laboratory is tedious and time-consuming. There have been many attempts to indirectly predict UCS using simpler tools and techniques. One of them is the nail gun. The scope of this investigation is to design a nailer which can be applied all construction materials whose UCS range from 1-100 MPa. In the research, rocks, bricks, and concretes prepared in different cement/sand ratios with different strength ranges were used as materials. The unconfined compressive strength of the materials used in the experiments was first determined by conventional compression tests. The nail penetration depths were determined by conducting experiments on the same materials using a nailer with two different energy levels. An empirical relationship was developed by using nail penetration depths, driving energies, and nail diameters as the independent variables and the UCS determined by the conventional method as the dependent variable. According to the empirical relationship determined by multiple regression analysis, the UCS of building materials can be estimated with significance level of 99% by the nail penetration method. The research also revealed that the UCS of rocks might have a coefficient of variation as high as 30%.

Anahtar Kelimeler

Compressive strength, building materials, nail gun, driving energy.

Etik Beyan

The funding for this research was provided by the Scientific and Technological Research Council of Türkiye (TÜBİTAK) with grant number 120M030.

Destekleyen Kurum

The funding for this research was provided by the Scientific and Technological Research Council of Türkiye (TÜBİTAK) with grant number 120M030.

Proje Numarası

The funding for this research was provided by the Scientific and Technological Research Council of Türkiye (TÜBİTAK) with grant number 120M030.

Teşekkür

The funding for this research was provided by the Scientific and Technological Research Council of Türkiye (TÜBİTAK) with grant number 120M030.

Kaynakça

• Aoki, H., Matsukura, Y. 2008. Estimating the unconfined compressive strength of intact rocks from Equotip hardness. Bulletin of Engineering Geology and the Environment 67, 23–29.
• ASTM. 1995. Standard test method for determination of the point load strength index of rock. ASTM Standard D5731.
• ASTM. 2001. Standard test method for determination of rock hardness by rebound hammer method. ASTM Standard D5873.
• ASTM. 2002. Standard test method for unconfined compressive strength of intact rock core specimen. ASTM D2938.
• Bae, G. J., Lee, S. W., Chang, S. H., Park, H. G., Lee, M. S., Kim, J. K. 2004. Application of pneumatic pin penetration test to estimation of compressive strength of shotcrete in Korea. Tunneling and Underground Space Technology 19, 432-440.
• Broch, E., Franklin, J. A. 1972. Point-load strength test. International Journal of Rock Mechanics and Mining Sciences 9(6), 241-246.
• Felicetti, R., Gattesco, N. 1998. Apenetration test to study the mechanical response of mortar in ancient masonry buildings. Materials and Structures 31(5), 350-356.
• ISRM. 1978. Suggested method for determining hardness and abrasiveness of rocks. International Journal of Rock Mechanics and Mining Sciences 15, 89–97.
• ISRM. 1985. Suggested method for determining point-load strength. International Journal of Rock Mechanics and Mining Sciences 22, 53-60.
• Kayabalı, K., Selçuk, L. 2010. Nail penetration test for determining the uniaxial compressive strength of rock. International Journal of Rock Mechanics and Mining Sciences 47, 265-271.
• Li, X., Rupert, G., Summers, D. A., Santi, P., Liu, D. 2000. Analysis of impact hammer rebound to estimate rock drillability. Rock Mechanics and Rock Engineering 33,1–13.
• Liberatore, D., Spera, G., Cotugno, M. 2003. A new penetration test on mortar joints. On-site Control and Evaluation of Masonry Structures 191-202.
• Malhotra, V. M., Carino, N. J. 1991. Handbook on nondestructive testing of concrete. Boca Raton, FL, CRC Press, 384.
• Maruto Corporation. 2006. Penetrometer for soft rock: Model SH-70 instruction manual.
• Mishra, D. A., Basu, A. 2012. Use of the block punch test to predict the compressive and tensile strengths of rocks. International Journal of Rock Mechanics and Mining Sciences 51, 119-127.
• Ngan-Tillard, D. J. M., Verwaal, W., Mulder, A., Engin, H. K., Ulusay, R. 2011. Application of the needle penetration test to a calcarenite, Maastricht, the Netherlands. Engineering Geology 123(3), 214-224.
• Oakdale Engineering 2008. DATAFIT: Version 9.0, RC 101, 23 Tomey Road, Oakdale, PA, 15071 USA.
• Palassi, M., Emami, V. 2014. A new nail penetration test for estimation of rock strength. International Journal of Rock Mechanics and Mining Sciences (66), 124-127.
• Pucinotti, R. 2005. Non destructive testing in the valuation of reinforced concrete structural degradation. L’Industria Italiana del Cemento 810, 446-460.
• Pucinotti, R. 2009. In situ concrete strength assessment: Influence of the aggregate hardness on the Windsor probe test results. Journal of Building Appraisal 5(1), 75-85.
• Selçuk, L., Kayabalı, K. 2015. Evaluation of the unconfined compressive strength of rocks using nail guns. Engineering Geology 195(3), 164-171.
• Selçuk, L., Çoban, S., Kayabalı, K., Şimşek, O. 2012. A non- destructive testing technique: Nail penetration test. ACI Structural Journal 109(2), 245-252.
• Szwedzicki, T. 1998. Indentation hardness testing of rock. International Journal of Rock Mechanics and Mining Sciences 35, 825–829.
• Ulusay, R., Gökceoğlu, C., Sülükçü, S. 2001. Draft ISRM suggested method for determining block punch strength index (BPI). International Journal of Rock Mechanics and Mining Sciences 38, 1113– 1119.
• Van der Schrier, J. S. 1988. The block punch index test. Bulletin of the International Association of Engineering Geology 38, 121-126.Verwaal, W., Mulder, A. 1993. Estimating rock strength with the Equotip hardness tester. International Journal of Rock Mechanics and Mining Science Geomechanics Abstracts 30, 659–662.
• Yılmaz, I. 2009. A new testing method for indirect determination of the unconfined compressive strength of rocks. International Journal of Rock Mechanics and Mining Sciences 46, 1349–1357.
• Yılmaz, I., Sendir, H. 2002. Correlation of Schmidt hardness with unconfined compressive strength and Young’s modulus in gypsum from Sivas (Turkey). Engineering Geology 66, 211–219.