The compressive strength, in particular, depends both on petrophysical features, the content of pumice, and the type of matrix: tuff is weak, characterized by low values of …

 — 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 …

 — The strength of rock under uniaxial compression, commonly known as Uniaxial Compressive Strength (UCS), plays a crucial role in various geomechanical applications such as designing foundations ...

 — Overall, the compressive strength decreased with the increase in TP content, which may be because the reaction activity of TP is low compared with cement [14,19]. In addition, the compressive strength of each group after steam curing was higher than after the standard curing for the same period.

absorption in percent and the compressive strength in pounds per square inch. The formula is as follows: –abrasion index = 100 x absorption/compressive strength AbrasionIndex, max Volume Abrasion Loss Max, cm3/cm2 Type I 0.11 1.7 Type II 0.25 2.7 Type III 0.50 4.0 AbrasionIndex, max Volume Abrasion Loss Max, cm3/cm2

 — The main objective of this experimental work is to determine the physico-mechanical properties of tuffs used as building stone and to investigate the relationships …

The compressive strength, in particular, depends both on petrophysical features, the content of pumice, and the type of matrix: tuff is weak, characterized by low values of bulk density, medium-low compressive strength (with great variability between 1.2 …

 — The comparison of compressive strength between this study and reference studies undertaken on the floor tile composites demonstrated it was within the given ranges. The results obtained in this study confirm that the natural fibers such as false banana and sisal fibers could be used to produce lightweight and relatively low compressive strength ...

The dynamic compressive strength factor for the granite was less than 1; for the basalt, 1.35; for the limestone, 1.52; and for the tuff, 1.7^-« The compressional wave velocity of

 — The relationship of the effective porosity and bulk density with strength parameters like compressive and tensile strength is of exponential nature (Fig. 10). With increasing bulk density, the compressive and tensile strength are increasing exponentially, whereas increasing porosity is accompanied by an exponential decrease of strength …

 — The compressive strength of the mortar samples was tested to analyze and compare the influence of TP and FA on the development of compressive strength in LHPC. Three replicate samples were tested according to GB/T17671-2021 at …

 — It is apparent that there is a strong correlation between porosity and the mechanical properties of the tuff. Unconfined compressive strength decreases with increasing porosity and hence water absorption values. The abrasion values also are affected by the porosity of the materials. Naturally, porosity leads to more water …

 — 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.

 — compressive strength) of tuff masonries still presents some difficulties, and laboratory tests are . seldom possible. Furthermore, the strong heterogeneity of tuff masonry also makes the use of .

 — The uniaxial monotonic compressive behavior of tuff masonry has been studied by laboratory tests carried out along the directions parallel and orthogonal to the mortar bed joints. ... Such constitutive models require only the peak compressive strength and the relevant yielding strain as input data. The allowable strain ductility of masonry …

 — As expected, compressive strength decreases with increasing porosity due to lithophysae in tuff and cavities in plaster analog specimens. Failure modes of cylindrical specimens were also investigated.

 — The dynamic compressive strength of rock materials increases with the strain rate. They are usually obtained by conducting laboratory tests such as split Hopkinson pressure bar (SHPB) test or drop-weight test. It is commonly agreed now that the dynamic increase factor (DIF) obtained from impact test is affected by lateral inertia confinement, …

The assessment of the modulus of elasticity and compressive strength of masonry is a fundamental step in the seismic analysis of existing structures. In this paper, the …

The hardness of Tuff is 4-6 whereas its compressive strength is 243.80 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.

 — The equations for the number of freezing and thawing versus uniaxial compressive strength were obtained by fitting the change curves of uniaxial compressive strength of two groups of rock samples ...

 — The experimental groups were made of the tuff powder with different particle sizes instead of the 30% cement, and the 28 d compressive strength of the tuff powder with different particle sizes was measured, respectively, after 28 d standard curing, and then the 28 d activity indexes of the tuff powder with different particle sizes were obtained ...

 — 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 …

 — Neapolitan Yellow Tuff (NYT) has been used in construction in Naples (Italy) since the Greeks founded the city—then called Neapolis—in the sixth century BCE. We investigate here whether this popular building stone is weaker when saturated with water, an issue important for assessments of weathering damage and monument preservation. …

 — The compressive strength of tuff as a function of strain rate from 10 −6 to 10 3 /sec. ... the tensile strength is generally found more sensitive to strain rate than the compressive strength. Due to the uneven strain induced by stress concentration around the flaw, the strain rate is also uneven and proportional to the stress intensity naming ...

The compressive strength of the concrete cube test provides an idea about all the characteristics of concrete. By this single test one judge that whether Concreting has been done properly or not. Concrete compressive …

28-day compressive strength, MPa Air-entrained concrete 28-day compressive strength, 1000 psi Non-air-entrained concrete Fig. 9-2. Approximate relationship between compressive strength and water to cementing materials ratio for concrete using 19-mm to 25-mm (3⁄ 4-in. to 1-in.) nominal maximum size coarse aggregate. Strength is based on ...

 — The standard physical and mechanical tests (void ratio, porosity, density, specific gravity, water absorption, uniaxial compressive strength and tensile strength) were carried out on the tuff and ...

tuff samples to have ductile failure. The tuff samples HK2 and HK4, which have reduced porosity (<5 %), experienced brittle failure along preexisting fractures. The tuff samples have undergone varying degrees of alteration, with the silicified (and least porous) sample exhibiting the highest unconfined compressive strength value. The wide range in

It is shown that equations correlating the masonry compressive strength with the modulus of elasticity provide values larger than the mean of experimental data, whereas the equations correlating the masonry compressive strength with the strength of components provide lower values, if block and mortar strengths are varied within a probable and ...