scholarly journals The Influence of Size Effect on Strength and Deformation Characteristics of Different Types of Rock Samples

2021 ◽  
Vol 720 (1) ◽  
pp. 012089
Author(s):  
O M Usol’tseva ◽  
P A Tsoi
Keyword(s):  
Size Effect ◽  
Deformation Characteristics ◽  
Rock Samples ◽  
Different Types ◽  
Strength And Deformation

scholarly journals The effect of the type of fixators reinforcement on strength and deformation characteristics of reinforced concrete

2019 ◽  
Vol 97 ◽  
pp. 02034
Author(s):  
Evgenij Borisyuk
Keyword(s):  
Reinforced Concrete ◽  
Crack Resistance ◽  
Steel Reinforcement ◽  
Low Grade ◽  
High Grade ◽  
Building Structures ◽  
Deformation Characteristics ◽  
Reliable Operation ◽  
Different Types ◽  
Strength And Deformation

Rebar fixators of various types (plastic and concrete) became widespread with manufacturing of building structures of precast and monolithic reinforced concrete in order to fix steel reinforcement cage in strictly design position and to exclude the probability of its displacement during concreting. Such sufficiently rigid fixing is necessary for the following reliable operation of the structure in the building, as well as for the preservation of steel reinforcement which protected by a necessary layer of concrete from corrosion. Information available in the literature does not allow us to judge about the effects that different types of fixators apply to exploitative properties (such as strength and crack resistance) of reinforced concrete. The experiments, according to the accepted method, showed that these characteristics are slightly worse for the samples with plastic fixators and fixators made of low grade concrete than for the samples without fixators or fixators made of high grade concrete. On the base on the research results it becomes possible to substantiate the distinction between the areas of application of plastic and concrete fixatives

scholarly journals Effect of Vertical Drains on Strength and Deformation Characteristics of Lithomargic Clay

2019 ◽  
Vol 9 (2) ◽  
pp. 3199-3204
Keyword(s):  
Ground Improvement ◽  
Drainage System ◽  
Excess Pore Pressure ◽  
Deformation Characteristics ◽  
Vertical Drains ◽  
Lithomargic Clay ◽  
Different Types ◽  
Consolidation Rate ◽  
Strength And Deformation ◽  
Different Diameters

During olden days, construction used to be carried out only on the sites having good strength. But now-a-days availability of sites with favourable properties are limited. So, there is a need to modify the properties of subsoil using different types of Ground Improvement Techniques. Depending upon the nature of soil, a suitable economical technique needs to be adopted. Soft soils have weaker strength and they are highly compressible and take a lot of time for settlement. So, these are typically problematic for construction. There is a need to improve the condition by accelerating the rate of consolidation. To achieve higher rate of consolidation, it is important to develop shorter paths for movement of the water. A vertical drainage system can be provided to accelerate the rate of consolidation and help to minimise excess pore pressure in the sub-soil. As a result of this, a stable situation is reached more quickly. Thus to enhance the strength of the soil and to accelerate the consolidation rate, vertical drains of different diameters and with varied spacing are employed. The improvement in properties of soft consolidating lithomargic clay is experimentally tested with vertical sand drains in developed prototype. The vertical sand drains installed with 1.905 (0.75 inch) diameter and 6 cm spacing is more effective in increasing Ultimate Bearing Capacity (UBC) of soil and also the rate of settlement of 35.26 % is significant up to 60 kg of preloads. Thus problematic lithomargic clay can be improved in its strength and settlement characteristics

scholarly journals Strength and Deformation Characteristics of the Neogene Siltstone, exampled from Middle Formation of Kazusa Group.

1993 ◽  
Vol 34 (5) ◽  
pp. 233-244 ◽  
Author(s):  
Takayasu HOSONO ◽  
Masayuki NAKAJIMA ◽  
Kazuhiro KOIZUMI ◽  
Nobutaka SUGITA ◽  
Shohji OGAWA
Keyword(s):  
Deformation Characteristics ◽  
Strength And Deformation

scholarly journals Size Effect on the Strength and Deformation Behavior of Glassy Carbon Nanopillars

MRS Advances ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 133-138 ◽  
Author(s):  
Almut Albiez ◽  
Ruth Schwaiger
Keyword(s):  
Size Effect ◽  
Glassy Carbon ◽  
Deformation Behavior ◽  
High Strength ◽  
Compression Tests ◽  
Failure Initiation ◽  
Initial Polymer ◽  
Constituent Material ◽  
Strength And Deformation ◽  
Very High

ABSTRACTGlassy carbon nanolattices can exhibit very high strength-to-weight ratios as a consequence of their small size and the material properties of the constituent material. Such nanolattices can be fabricated by pyrolysis of polymeric microlattices. To further elucidate the influence of the mechanical size effect of the constituent material, compression tests of glassy carbon nanopillars with varying sizes were performed. Depending on the specific initial polymer material and the nanopillar size, varying mechanical properties were observed. Small nanopillars exhibited elastic-plastic deformation before failure initiation. Moreover, for smaller nanopillars higher strength values were observed than for larger ones, which might be related to smaller defects and a lower defect concentration in the material.

'Size-effect'-like distortions in quasicrystalline structures

2002 ◽  
Vol 217 (7-8) ◽  
Author(s):  
T. R. Welberry ◽  
M. Honal
Keyword(s):  
Size Effect ◽  
Diffraction Pattern ◽  
Penrose Tiling ◽  
Remarkable Similarity ◽  
Zero Level ◽  
Different Types

AbstractWe show in this paper that by applying size-effect distortions to a perfect Penrose tiling, on the basis that rhomb-edges which connect different types of vertices assume different lengths, we can obtain a diffraction pattern which shows remarkable similarity to the zero-level (

scholarly journals Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

2019 ◽  
Vol 92 ◽  
pp. 05008
Author(s):  
Zain Maqsood ◽  
Junichi Koseki ◽  
Hiroyuki Kyokawa
Keyword(s):  
Strain Rate ◽  
Axial Strain ◽  
Constitutive Modelling ◽  
Strain Rates ◽  
Deformation Characteristics ◽  
Wide Range ◽  
Strength And Deformation ◽  
Loading Tests ◽  
Rational Evaluation ◽  
Strain Responses

It has been unanimously acknowledged that the strength and deformation characteristics of bounded geomaterials, viz. cemented soils and natural rocks, are predominantly governed by the rate of loading/deformation. Rational evaluation of these time-dependent characteristics due to viscosity and ageing are vital for the reliable constitutive modelling. In order to study the effects of ageing and loading/strain rate (viscosity) on the behaviour of bounded geomaterials, a number of unconfined monotonic loading tests were performed on Gypsum Mixed Sand (GMS) specimens at a wide range of axial strain rates; ranging from 1.9E-05 to 5.3E+00 %/min (27,000 folds), and at different curing periods. The results indicate shifts in the viscous behaviour of GMS at critical strain rates of 2.0E-03 and 5.0E-01 %/min. In the light of this finding, the results are categorized into three discrete zones of strain rates, and the behaviour of GMS in each of these zones is discussed. A significant dependency of peak strength and stress-strain responses on strain rate was witnessed for specimens subjected to strain rates lesser than 2.0E-03 %/min, and the effects of viscosity/strain rate was found to be insignificant at strain rate higher than 5.0E-01%/min.

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