Mechanical Behaviour of Bentonite-Cement Mixtures Subjected to Change in Moisture Content

2021 ◽  
pp. 139-151
Author(s):  
Rakesh Kumar Dutta ◽  
Jitendra Singh Yadav ◽  
Ambuj Kumar Shukla
Keyword(s):  
Moisture Content ◽  
Mechanical Behaviour ◽  
Cement Mixtures

Influence of mineralogy and moisture content on plasticity and induced anisotropic damage of a claystone; application to nuclear waste disposals

2000 ◽  
Vol 171 (6) ◽  
pp. 621-627 ◽  
Author(s):  
Anne-Sophie Chiarelli ◽  
Beatrice Ledesert ◽  
Malek Sibai ◽  
Mohammed Karami ◽  
Nasser Hoteit
Keyword(s):  
Moisture Content ◽  
Nuclear Waste ◽  
Mechanical Behaviour ◽  
Triaxial Compression ◽  
Anisotropic Damage ◽  
Compression Tests ◽  
Two Factors ◽  
Triaxial Compression Tests ◽  
The Way

Abstract The influence of mineralogy and moisture content on mechanical behaviour of a claystone rock is studied by the way of uniaxial and triaxial compression tests and microscopic observations. Some parameters characteristic of phenomena like plasticity and induced anisotropic damage are discussed as a function of these two factors. Rock behaviour becomes more brittle when calcite content grows or when clay or moisture content decreases. At the microlevel, plasticity is induced by slip of clay sheets and induced anisotropic damage appears by growth of oriented microcracks at the interface between grains and matrix.

Soil Based Barriers for a Low and Intermediate Level Radioactive Waste Disposal

2003 ◽  
Author(s):  
Dimitar Antonov
Keyword(s):  
Moisture Content ◽  
Radioactive Waste ◽  
Intermediate Level ◽  
Radioactive Waste Disposal ◽  
Dry Density ◽  
Paper Strength ◽  
Maximum Dry Density ◽  
Soil Cement ◽  
Intermediate Level Radioactive Waste ◽  
Cement Mixtures

The loess terrains near “Kozloduy” NPP are among the prospective areas for the disposal of low and intermediate level radioactive waste. The analysis of the loess properties has shown two main problems: a loess collapsibility and water permeability. Using a soil-cement cushion under the repository foundation and a soil-cement backfill between the containers is a possibility to avoid these disadvantages. In this connection loess-cement mixtures with bentonite and clinoptilolite additives have been investigated. The aim of mixtures is to improve the impermeability and sorbtion properties against radionuclide migration. In the paper strength parameters of two kind of mixtures are discussed. According to their water content some are compacted at the optimum moisture content until the maximum dry density and others are compacted at higher moisture content equal to the liquid limit of loess. For the first type of mixtures the unconfined compressive strength (UCS) varies from 2 to 6 MPa depending on the cement and additives percents. Permeability measurements have shown satisfactory results. The UCS for the second type of mixtures is less than the first type, but is sufficient for a backfill between the waste containers. The conclusion is that the loess-cement mixtures, especially these with clinoptilolite additive, are prospective as barriers of a low and intermediate level radioactive waste repository.

scholarly journals Effect of temperature and moisture content on tensile behaviour of false banana fibre (Ensete ventricosum)

2017 ◽  
Vol 31 (3) ◽  
pp. 377-382 ◽  
Author(s):  
Cestmir Mizera ◽  
David Herak ◽  
Petr Hrabe ◽  
Abraham Kabutey
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Relative Humidity ◽  
Moisture Content ◽  
Water Absorption ◽  
Mechanical Behaviour ◽  
Effect Of Temperature ◽  
Tensile Behaviour ◽  
Ensete Ventricosum ◽  
Banana Fibre

Abstract The mechanical behaviour of natural fibres as composite materials can be affected by changes in temperature and moisture content. The aim of this paper was to describe the effect of temperature and moisture content on tensile strength of false banana fibre (Ensete ventricosum) and to determine its water absorption. Samples of fibres were prepared and tested until rupture point with strain rate of 0.05 min−1 at temperature change between −20 and 220°C as well as moisture content between 10 and 90% wb. The water absorption and release of Ensete fibres at 60 and 90% relative humidity was also determined. Results showed that Ensete fibres exhibited stability of tensile strength in the temperature range from 0 to 100°C but the increase of temperature decreased statistically significantly the tensile strength. The effect of moisture content on tensile strength was not statistically significant. The equilibrium moisture content at 60% relative humidity and 25°C was determined.

scholarly journals Mechanical properties of native maize, wheat, and potato starches

2013 ◽  
Vol 31 (No. 4) ◽  
pp. 347-354 ◽  
Author(s):  
M. Stasiak ◽  
M. Molenda ◽  
I. Opaliński ◽  
W. Błaszczak
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Mechanical Behaviour ◽  
Potato Starch ◽  
Uniaxial Compression Test ◽  
Strength Parameters ◽  
Ring Shear ◽  
Potato Starches ◽  
Particle Sizer ◽  
Shear Tester

The interrelations between moisture content and mechanical properties of dry and wet native starches of wheat, maize, and potato were investigated. Strength parameters of powders were tested using direct shear and ring shear tester. Carr indices and associated parameters were determined using a Hosokawa Powder Tester. Particle size distribution of powder was analysed using an Infrared Particle Sizer. Uniaxial compression test was conducted to determine the reaction of powder in a cylindrical probe to vertical load. Mechanical behaviour of the material was found to be changing with increasing moisture content. Mechanical behaviour of potato starch was found to be different from that of cereal starches, which may require different utilisation in some processes.  

scholarly journals PERMEABILITY AND MECHANICAL BEHAVIOUR OF MICROWAVE PRE-TREATED NORWAY SPRUCE RIPEWOOD

Wood Research ◽  
2021 ◽  
Vol 66 (4) ◽  
pp. 569-581
Author(s):  
DOMINIK HESS ◽  
PETR PAŘIL ◽  
JAKUB DÖMÉNY ◽  
JAN BAAR
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Norway Spruce ◽  
Mechanical Behaviour ◽  
Vacuum Pressure ◽  
Average Depth ◽  
Depth Of Penetration ◽  
Pre Treatment ◽  
Variable Moisture Content

This is a studyofthe influence of microwave (MW) pre-treatment on the permeabilityof Norway spruceripewood(Picea abiesL. Karst)as it affects its mechanical properties. Specimens weretreated under variable moisture content,MW intensity,and impregnation processes. According to the results,thespecimens withaninitial moisture contentof 45–65% exhibited the highest permeabilityvaluescompared to referencesamples. Aninsignificant difference was found between MW pre-treatments at2 and3kW.Statistically significant results were found afterlong-time (24h) vacuum-pressureimpregnation(LP). Theaverage retention value followingLP was 132 kg.m-3, which isalmost threetimes greater thanthe MW-treatedgroupsimpregnated in ashort-time vacuum-pressure process. The average depth of penetration after LP was 2.0mm and the proportion of the impregnation area followingLP was 17.6%. MW pre-treatment had no effect on the impregnability or the mechanical propertiesof the wood; other MW regimes are open for further examination.

scholarly journals Application of a tangent curve mathematical model for analysis of the mechanical behaviour of sunflower bulk seeds

2015 ◽  
Vol 29 (4) ◽  
pp. 517-524 ◽  
Author(s):  
Riswanti Sigalingging ◽  
David Herák ◽  
Abraham Kabutey ◽  
Oldřich Dajbych ◽  
Petr Hrabě ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Czech Republic ◽  
Moisture Content ◽  
Mechanical Behaviour ◽  
Vessel Diameter ◽  
Maximum Force ◽  
Oil Yield ◽  
Compression Process ◽  
Deformation Curves ◽  
The Relationship

AbstractThis paper evaluate the use of a tangent curve mathematical model for representation of the mechanical behaviour of sunflower bulk seeds. Compression machine (Tempos Model 50, Czech Republic) and pressing vessel diameter 60 mm were used for the loading experiment. Varying forces between 50 and 130 kN and speeds ranging from 10, 50, and 100 mm min-1were applied respectively on the bulk seeds with moisture content 12.37±0.38% w.b. The relationship between force and deformation curves of bulk seeds of pressing height 80 mm was described. The oil point strain was also determined from the different deformation values namely 30, 35, 40, and 45 mm at speed 10 mm min-1. Based on the results obtained, model coefficients were determined for fitting the experimental load and deformation curves. The validity of these coefficients were dependent on the bulk seeds of pressing height, vessel diameter, maximum force 110 kN, and speed 10 mm min-1, where optimal oil yield was observed. The oil point was detected at 45 mm deformation giving the strain value of 0.56 with the corresponding force 16.65±3.51 kN and energy 1.06±0.18 MJ m-3. At the force of 130 kN, a serration effect on the curves was indicated; hence, the compression process was ceased.

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