Salt crystallization is one of the most powerful weathering agents that may cause a rapid change in the mechanical properties of stones, and thus limit their durability. Consequently, determining the mechanical properties of stones due to salt crystallization is important for natural building stones used in marine environmental and mild climatic conditions, which expose excessive salt crys...

Abstract In the field of deep mining engineering, it poses a challenge to promptly determine mechanical properties rocks under poor geological conditions through in-situ tests. However, indirect determination uniaxial compressive strength (UCS) can be achieved point load index (PLSI) test on irregular samples. present study, laboratory and PLSI tests were carried out ore rock blocks extracted m...

Abstract Initial detrital composition and authigenic alterations during diagenesis of three sandstone types are related to their mechanical properties. Sandstones were prepared for geotechnical standard tests [density, uniaxial compressive strength (UCS), Young’s modulus ( E ), strain at failure ? )] thin sections petrographic analyses (point counting). UCS ranges from 3 62 MPa positively corre...

In geotechnical engineering, rock mechanics and engineering geology, depending on the project design, uniaxial strength and static Youngchr('39')s modulus of rocks are of vital importance. The direct determination of the aforementioned parameters in the laboratory, however, requires intact and high-quality cores and preparation of their specimens have some limitations. Moreover, performing thes...

OBJECTIVES To assess compressive strength and effect of duration after photoactivation on the compressive strength of different dual cure bulk fill composites. METHODS Seventy-two disc shaped (4x10mm) specimens were prepared from three dual cure bulk fill materials, ZirconCore (ZC) (n=24), MulticCore Flow (MC) (n=24) and Luxacore Dual (LC) (n=24). Half of the specimens in each material were t...

In order to understand the changes in properties of cemented tailings backfill (CTB) during curing process. this paper, CTB samples with a cement-sand ratio 1:6 were prepared and cured for 3, 5, 7, 14, 21, 28, 60, 140 200 days respectively, then series uniaxial compression tests carried out. Then stress-strain relationship, compressive properties, elastic modulus, etc. different age analyzed. R...

Conventionally, many researchers have used both regression and black box techniques to estimate the unconfined compressive strength (UCS) of different rocks. The advantage of the regression approach is that it can be used to render a functional relationship between the predictive rock indices and its UCS. The advantage of the black box techniques is in rendering more accurate predictions. Gene ...

Rock mass stability is often affected by water–rock interaction in underground engineering construction. Cretaceous sandstones have weak cementation, low strength and strong water-holding capacity, their rock easily weakened these activities. In this paper, the uniaxial compressive (UCS) tensile (TS) of weakly cemented from different sedimentary facies under natural saturated conditions were te...

During the construction of nuclear waste storage facilities, deep drilling, and geothermal energy development, high-temperature rocks are inevitably subjected to thermal shock. The physical mechanical behaviors granite treated with different shocks were analyzed by non-destructive (P-wave velocity test) destructive tests (uniaxial compression test Brazil splitting test). results show that P-wav...