Title:
Strength Variability and Its Relationship with Microstructure of Coarse Granite Aggregates
Author(s):
A. A. Bastos, N. V. Silva, J. P. Monticelli, M. M. Futai, L. M. Tavares, and S. C. Angulo
Publication:
Materials Journal
Volume:
119
Issue:
4
Appears on pages(s):
63-73
Keywords:
coarse aggregates; microstructure-strength relationship; rock weathering; strength variability; water absorption
DOI:
10.14359/51734686
Date:
7/1/2022
Abstract:
The present work investigated the relationship between strength variability and the microstructure of granite aggregates. The strength of particles was determined by an improved point load test. The microstructure and composition were evaluated by tactile-visual analysis, water absorption, X-ray diffraction, and petrographic analysis with the calculation of the micropetrographic index. The weathering grade was estimated according to tactile-visual analysis and the relationships between strength, micropetrographic index, water absorption, and literature data. The results demonstrated that the relationship among the micropetrographic index and strength is more defined than that with water absorption. The strength appears to reduce with the presence of minerals with well-defined cleavage and orthoclase feldspar phenocrystals observed through petrographic analysis, but is not quantified. Low strength seems to be related to higher water absorption and weathering grade. Additional work, however, will be required to confirm these findings through quantification of the proportion of both minerals with cleavage and feldspar phenocrystals.
Related References:
1. Krausmann, F.; Lauk, C.; Haas, W.; and Wiedenhofer, D., “From Resource Extraction to Outflows of Wastes and Emissions: The Socioeconomic Metabolism of the Global Economy, 1900–2015,” Global Environmental Change, V. 52, Sept. 2018, pp. 131-140. doi: 10.1016/j.gloenvcha.2018.07.003
2. Pepe, M.; Grabois, T. M.; Silva, M. A.; Tavares, L. M.; and Toledo Filho, R. D., “Mechanical Behaviour of Coarse, Lightweight, Recycled and Natural Aggregates for Concrete,” Proceedings of the Institution of Civil Engineers – Construction Materials, V. 173, No. 2, Apr. 2020, pp. 70-78.
3. Habert, G.; Bouzidi, Y.; Chen, C.; and Jullien, A., “Development of a Depletion Indicator for Natural Resources Used in Concrete,” Resources, Conservation and Recycling, V. 54, No. 6, Apr. 2010, pp. 364-376. doi: 10.1016/j.resconrec.2009.09.002
4. Mehta, P. K., and Monteiro, P. J. M., Concrete: Microstructure, Properties, and Materials, third edition, McGraw-Hill, New York, NY, 2006.
5. Lim, W. L.; McDowell, G. R.; and Collop, A. C., “The Application of Weibull Statistics to the Strength of Railway Ballast,” Granular Matter, V. 6, No. 4, Dec. 2004, pp. 229-237. doi: 10.1007/s10035-004-0180-z
6. Ahmadi Sheshde, E., and Cheshomi, A., “New Method for Estimating Unconfined Compressive Strength (UCS) Using Small Rock Samples,” Journal of Petroleum Science and Engineering, V. 133, Sept. 2015, pp. 367-375. doi: 10.1016/j.petrol.2015.06.022
7. Cheshomi, A., and Ahmadi Sheshde, E., “Determination of Uniaxial Compressive Strength of Microcrystalline Limestone Using Single Particles Load Test,” Journal of Petroleum Science and Engineering, V. 111, Nov. 2013, pp. 121-126. doi: 10.1016/j.petrol.2013.10.015
8. Cheshomi, A.; Mousavi, E.; and Ahmadi-Sheshde, E., “Evaluation of Single Particle Loading Test to Estimate the Uniaxial Compressive Strength of Sandstone,” Journal of Petroleum Science and Engineering, V. 135, Nov. 2015, pp. 421-428. doi: 10.1016/j.petrol.2015.09.031
9. Askeland, D. R., and Wright, W. J., Essentials of Materials Science and Engineering, fourth edition, Cengage Learning, Stamford, CT, 2014.
10. Silva, N. V.; Angulo, S. C.; da Silva Ramos Barboza, A.; Lange, D. A.; and Tavares, L. M., “Improved Method to Measure the Strength and Elastic Modulus of Single Aggregate Particles,” Materials and Structures, V. 52, No. 4, Aug. 2019, Article No. 77. doi: 10.1617/s11527-019-1380-7
11. Angulo, S. C.; Silva, N. V.; Lange, D. A.; and Tavares, L. M., “Probability Distributions of Mechanical Properties of Natural Aggregates Using a Simple Method,” Construction and Building Materials, V. 233, Feb. 2020, Article No. 117269. doi: 10.1016/j.conbuildmat.2019.117269
12. Lindqvist, J. E.; Åkesson, U.; and Malaga, K., “Microstructure and Functional Properties of Rock Materials,” Materials Characterization, V. 58, No. 11-12, Nov.-Dec. 2007, pp. 1183-1188. doi: 10.1016/j.matchar.2007.04.012
13. Tavares, L. M., and das Neves, P. B., “Microstructure of Quarry Rocks and Relationships to Particle Breakage and Crushing,” International Journal of Mineral Processing, V. 87, No. 1-2, Apr. 2008, pp. 28-41. doi: 10.1016/j.minpro.2008.01.007
14. Sajid, M.; Coggan, J.; Arif, M.; Andersen, J.; and Rollinson, G., “Petrographic Features as an Effective Indicator for the Variation in Strength of Granites,” Engineering Geology, V. 202, Mar. 2016, pp. 44-54. doi: 10.1016/j.enggeo.2016.01.001
15. Dearman, W. R., “Weathering Classification in the Characterisation of Rock for Engineering Purposes in British Practice,” Bulletin of the International Association of Engineering Geology, V. 9, No. 1, June 1974, pp. 33-42. doi: 10.1007/BF02635301
16. Lee, S. G., “Weathering and Geotechnical Characterization of Korean Granites,” PhD thesis, Imperial College London, London, UK, Mar. 1987, 485 pp.
17. Marques, E. A. G.; Barroso, E. V.; Menezes Filho, A. P.; and Vargas, E. A., Jr., “Weathering Zones on Metamorphic Rocks from Rio de Janeiro—Physical, Mineralogical and Geomechanical Characterization,” Engineering Geology, V. 111, No. 1-4, Feb. 2010, pp. 1-18. doi: 10.1016/j.enggeo.2009.11.001
18. Irfan, T. Y., and Dearman, W. R., “The Engineering Petrography of a Weathered Granite in Cornwall, England,” Quarterly Journal of Engineering Geology and Hydrogeology, V. 11, No. 3, Aug. 1978, pp. 233-244. doi: 10.1144/GSL.QJEG.1978.011.03.03
19. Gupta, A. S., and Rao, S. K., “Weathering Indices and Their Applicability for Crystalline Rocks,” Bulletin of Engineering Geology and the Environment, V. 60, No. 3, Aug. 2001, pp. 201-221. doi: 10.1007/s100640100113
20. Khanlari, G. R.; Heidari, M.; and Momeni, A. A., “Assessment of Weathering Processes Effect on Engineering Properties of Alvand Granitic Rocks (West of Iran), Based on Weathering Indices,” Environmental Earth Sciences, V. 67, No. 3, Oct. 2012, pp. 713-725. doi: 10.1007/s12665-011-1518-6
21. Basu, A., “Mechanical Characterization of Granitic Rocks of Hong Kong by Improved Index Testing Procedures with Reference to Weathering Induced Microstructural Changes,” PhD thesis, The University of Hong Kong, Hong Kong, 2005.
22. Monticelli, J. P., “Weathering Study of the Gneissic Rock Mass from the Monte Seco Tunnel Region, Southeastern Brazil,” master’s dissertation, University of São Paulo, São Paulo, SP, Brazil, 2019.
23. Quattrone, M.; Cazacliu, B.; Angulo, S. C.; Hamard, E.; and Cothenet, A., “Measuring the Water Absorption of Recycled Aggregates, What is the Best Practice for Concrete Production?” Construction and Building Materials, V. 123, Oct. 2016, pp. 690-703. doi: 10.1016/j.conbuildmat.2016.07.019
24. Brook, N., “The Equivalent Core Diameter Method of Size and Shape Correction in Point Load Testing,” International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, V. 22, No. 2, Apr. 1985, pp. 61-70. doi: 10.1016/0148-9062(85)92328-9
25. ASTM D5731-08, “Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classifications,” ASTM International, West Conshohocken, PA, 2008, 12 pp.
26. Cavalcanti, P. P., and Tavares, L. M., “Statistical Analysis of Fracture Characteristics of Industrial Iron Ore Pellets,” Powder Technology, V. 325, Feb. 2018, pp. 659-668. doi: 10.1016/j.powtec.2017.11.062
27. Callister W. D. Jr., and Rethwisch, D. G., Materials Science and Engineering, ninth edition, John Wiley & Sons, Inc., Hoboken NJ, 2014.
28. Lobo-Guerrero, S., and Vallejo, L. E., “Application of Weibull Statistics to the Tensile Strength of Rock Aggregates,” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, V. 132, No. 6, June 2006, pp. 786-790. doi: 10.1061/(ASCE)1090-0241(2006)132:6(786)
29. Danzer, R.; Supancic, P.; Pascual, J.; and Lube, T., “Fracture Statistics of Ceramics – Weibull Statistics and Deviations from Weibull Statistics,” Engineering Fracture Mechanics, V. 74, No. 18, Dec. 2007, pp. 2919-2932. doi: 10.1016/j.engfracmech.2006.05.028
30. Ulusay, R., ed., The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007-2014, Springer International Publishing, Cham, Switzerland, 2015, 293 pp.
31. Delvigne, J. E., Atlas of Micromorphology of Mineral Alteration and Weathering, Mineralogical Association of Canada, Quebec City, QC, Canada, 1998, 494 pp.