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·ξ uniaxial compressive strength of the intact rock pieces ξ value of the Hoek Brown constant for these intact rock pieces and ξ value of the Geological Strength Index GSI for the rock mass marble rhyolite tuff R4 ; Strong 50 100 2 4 Specimen requires more than one blow of a geological hammer to fracture it Limestone marble
·Abstract Understanding strength and deformation of frozen rock is important for stability assessment of a rock slope in cold weather regions because surfaces of the rock slope often get frozen in winter In this study strength and deformation of frozen rock specimens of Shikotsu welded tuff and Bibai sandstone were investigated by uniaxial compression test at
·Understanding the mechanical properties of the lithophysae rich tuff including deformation modulus deformation ratio and compressive strength is an important issue for design and the
·The poor reactivity is the major limitation of the use of high replacement levels of volcanic tuff in concrete mixtures TGA/DTA and SEM of all mortar mixes were investigated The results showed that the compressive strength of specimens with 50% replacement of volcanic tuff which was activated by dry milling wet milling and calcination
·The tuff samples are immersed in water with different time periods of 1 6 24 and 48 h The following physico mechanical properties were measured for all the samples both in dry and saturated condition compressive strength and flexural strength
·DIF of compressive strength of rocks with a function of strain rate Zhang & Zhao 2014 Zhao et al 1999 Chong et al 1980 Doan & d Hour 2012 Olsson 1991 Sylven et al 2004 Wang & Tonon 2011
·Compressive strength development of complex binders containing fly ash and or tuff powder were investigated The results show that the physical filling effect of fly ash and tuff has a more
The hardness of Tuff is 4 6 whereas its compressive strength is N/mm 2 Streak is the color of rock when it is crushed or powdered The streak of Tuff is white whereas its fracture is uneven Luster of Tuff is the interaction of light with the surface of Tuff Luster of Tuff is vitreous to dull Tuff cleavage is not available
·Yasar E Tolgay A Teymen A 2009 Industrial usage of Nevsehir Kayseri Turkey tuff stone World Appl Sci J 7 3 271 284 Google Scholar Yesiloglu Gultekin N Gokceoglu C 2021 A comparison among some non linear prediction tools on indirect determination of uniaxial compressive strength and modulus of elasticity of basalt
·The dynamic compressive strength of tuff joints is highest at an angle of 0° and lowest at 60° the reason being that at 60° the rock mainly slides along the joint surface whereas at 0° the rock mainly undergoes tensile splitting Because the mechanical strength of the joint surface is significantly lower than that of the rock matrix
·The strength and deformation characteristics of the tuff specimens are also dependent on confining pressure Fig 3 shows representative stress strain curves of the saturated tuff specimens under different confining pressures 0 and MPa Some basic mechanical parameters of the specimens determined from the tests are tabulated in
PDF On Jun 26 2016 A Marotta and others published Estimation of unreinforced tuff masonry compressive strength based on mortar and unit mechanical parameters Find read and cite all the
·The compressive strength of tuff concrete exhibited a positive correlation with an increasing water cement ratio reaching a compressive strength of MPa at a B/C ratio = The mean density of tuff concrete is 19% lower than that of conventional concrete Consequently it is an appropriate material for the construction of structures
·The microstructure and mineralogy of volcanic rocks is varied and complex and their mechanical behaviour is similarly varied and complex This review summarises recent developments in our understanding of the mechanical behaviour and failure modes of volcanic rocks Compiled data show that although porosity exerts a first order influence on the uniaxial
·The additional tuff in concrete increases the earlier splitting tensile strength ultimate tensile value and drying shrinkage which also slightly reduces the frost resistance and little affects
·On this context a series of triaxial compressive strength tests were carried out on two different tuff samples under varying confining pressures Using the least squares regression H B criterion
·Uniaxial compressive strength UCS is the most fundamental physico mechanical parameter used for any rock mass classification in geotechnical and geological engineering However determining UCS is a very tough expensive time consuming and destructive method and requires experienced workers On the other hand P wave velocity
·The WCR of tuff is negatively correlated with the mechanical parameters such as the uniaxial compressive strength and is directly proportional to the coefficient C V of the discreteness in mechanical parameters for each group samples which means that the lower the WCR the higher the tuff strength and the smaller the discreteness in
·Guadagnuolo et al [14] conducted a large number of flat jack tests to estimate the modulus of elasticity and compressive strength of tuff masonry and compared the obtained results with the results of laboratory tests provided by other researchers as well as with code equations It was shown that the values from flat jack tests were lower than
·In this research ANNs have been used to predict the optimum content of Tuff fine aggregate to produce structural lightweight concrete with a wide range 20 to 50 MPa of compressive strength Three different types of Tuff aggregates namely gray brown and yellow Tuff were experimentally investigated A set of 68 mixes was produced by
·The correlations between rock compressive strength including static compressive strength σcs and dynamic compressive strength σcd and water weakening factors fw with strain rate are derived
The dynamic compressive strength factor for the granite was less than 1; for the basalt ; for the limestone ; and for the tuff ^ « The compressional wave velocity of
An experimental program based ontesting several standard cubes containing different percentages of volcanic tuff as coarse aggregate was results indicated that the best compressive
