Effects of Calcium-Based Surface Amendments on the Penetration Resistance of Subsurface Drained Sodic Soils

2016 ◽  
Vol 59 (4) ◽  
pp. 869-877
Keyword(s):  
Penetration Resistance ◽  
Sodic Soils ◽  
Surface Amendments

EFFECT OF FLY ASH ON CROP YIELD AND PHYSICO-CHEMICAL, MICROBIAL AND ENZYME ACTIVITIES OF SODIC SOILS

2016 ◽  
Vol 15 (11) ◽  
pp. 2433-2440 ◽  
Author(s):  
Kripal Singh ◽  
Vimal Chandra Pandey ◽  
Bajrang Singh ◽  
Dharani D. Patra ◽  
Rana P. Singh
Keyword(s):  
Fly Ash ◽  
Crop Yield ◽  
Enzyme Activities ◽  
Sodic Soils ◽  
Physico Chemical

Preliminary Results of Research on Snow and Avalanches in Czechoslovakia

1957 ◽  
Vol 3 (21) ◽  
pp. 72-77
Author(s):  
Miloš Vrba ◽  
Bedřich Urbánek
Keyword(s):  
Thermal Properties ◽  
Snow Cover ◽  
Penetration Resistance ◽  
Preliminary Results ◽  
Avalanche Danger

AbstractThis paper gives a brief account of the results so far obtained in research in Czechoslovakia on the crystallographic, stratigraphical and thermal properties of snow cover, and the use of these data in avalanche investigations. Avalanche danger is predicted by comparing the penetration resistance of snow layers, measured with a rammsonde, with resistance graphs of typical avalanche situations.

Missile Effect on Penetration Resistance of Ferrocement slabs

2010 ◽  
Vol 8 (8) ◽  
pp. 1-15
Author(s):  
Nabil Abdel.mutaal ◽  
Ashraf El.Ashaal ◽  
Essam El.Tehewy ◽  
Mohammad El-Sayed
Keyword(s):  
Penetration Resistance

scholarly journals The Rapid Chloride Migration Test in Assessing the Chloride Penetration Resistance of Normal and Lightweight Concrete

2021 ◽  
Vol 11 (16) ◽  
pp. 7251
Author(s):  
Jorge Pontes ◽  
José Alexandre Bogas ◽  
Sofia Real ◽  
André Silva
Keyword(s):  
Lightweight Concrete ◽  
Chloride Transport ◽  
Penetration Resistance ◽  
Chloride Penetration ◽  
Migration Test ◽  
Simple Method ◽  
Chloride Migration ◽  
Binder Ratio ◽  
Chloride Penetration Resistance ◽  
Water Binder Ratio

Chloride-induced corrosion has been one of the main causes of reinforced concrete deterioration. One of the most used methods in assessing the chloride penetration resistance of concrete is the rapid chloride migration test (RCMT). This is an expeditious and simple method but may not be representative of the chloride transport behaviour of concrete in real environment. Other methods, like immersion (IT) and wetting–drying tests (WDT), allow for a more accurate approach to reality, but are laborious and very time-consuming. This paper aims to analyse the capacity of RCMT in assessing the chloride penetration resistance of common concrete produced with different types of aggregate (normal and lightweight) and paste composition (variable type of binder and water/binder ratio). To this end, the RCMT results were compared with those obtained from the same concretes under long-term IT and WDT. A reasonable correlation between the RCMT and diffusion tests was found, when slow-reactive supplementary materials or porous lightweight aggregates surrounded by weak pastes were not considered. A poorer correlation was found when concrete was exposed under wetting–drying conditions. Nevertheless, the RCMT was able to sort concretes in different classes of chloride penetration resistance under distinct exposure conditions, regardless of the type of aggregate and water/binder ratio.

A Visco-hyperelastic Model for the Thermo-mechanical Behavior of Polymer Fibers

2010 ◽  
Vol 20 (7) ◽  
pp. 1002-1020 ◽  
Author(s):  
G.P. Potirniche ◽  
A. Pascu ◽  
N. Shoemaker ◽  
P.T. Wang ◽  
M.F. Horstemeyer ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Penetration Resistance ◽  
Polymer Chains ◽  
Polymer Fibers ◽  
Deformation Characteristics ◽  
Uniaxial Deformation ◽  
The Finite Element Method ◽  
Dynamic Event ◽  
Hyperelastic Model ◽  
Strain Rate Hardening

A visco-hyperelastic model for the thermo-mechanical behavior of polymer yarns is presented. The model assumes that the stress in a yarn during uniaxial deformation results from the superposition of strain rate hardening effects and the softening caused by filament damage. The filament damage accounts for the fracture of polymer chains and the failure of inter-chain bonds. The constitutive model was implemented in the finite element method as a 1D rope element, and was applied to the study of nylon 6.6 and Kevlar ® 29 behavior. Numerical simulations of fabrics subjected to ballistic impact were performed, and the model is shown to predict the fabric penetration resistance and the deformation characteristics during the dynamic event.

Growth, Oil Yield, and Ion Partitioning in Basil Grown on Sodic Soils

2008 ◽  
Vol 39 (5-6) ◽  
pp. 833-844 ◽  
Author(s):  
A. K. Nayak ◽  
R. K. Gautam ◽  
D. K. Sharma ◽  
V. K. Mishra ◽  
C. S. Singh ◽  
...  
Keyword(s):  
Oil Yield ◽  
Sodic Soils ◽  
Ion Partitioning

Light availability and soil compaction influence the growth of underplanted Nothofagus following partial shelterwood harvest and soil scarification

2015 ◽  
Vol 45 (8) ◽  
pp. 998-1005 ◽  
Author(s):  
Daniel P. Soto ◽  
Pablo J. Donoso ◽  
Christian Salas ◽  
Klaus J. Puettmann
Keyword(s):  
Soil Fertility ◽  
Soil Compaction ◽  
Light Availability ◽  
Penetration Resistance ◽  
Basal Diameter ◽  
Heavy Machinery ◽  
Light Levels ◽  
Soil Scarification ◽  
Total Light ◽  
Nothofagus Dombeyi

We evaluated effects of topsoil scarification by heavy machinery on growth of two valuable, shade-intolerant tree species — Nothofagus dombeyi (Mirb.) Oerst. (evergreen and considered to be very plastic to different soil fertility levels) and Nothofagus alpina (Poepp. & Endl.) Oerst. (deciduous and considered to be sensitive to soil fertility) — seedlings that were underplanted in Nothofagus old-growth forests, which were subjected to shelterwood cuttings without the final cut in the Chilean Andes. We compared tree basal diameter growth as it responds to light availability and soil compaction (as measured by resistance to penetration) by fitting a growth model based on the Michaelis–Menten equation. Predicted growth of N. dombeyi was greater than N. alpina in high and low light levels; however, there were no significant differences between the species. Both species showed significant differences at high levels of penetration resistance (>2000 kPa). Differences for N. dombeyi occurred above ∼40% in total light, and differences occurred for N. alpina above ∼20% in total light. However, they were not different when compared at low and intermediate levels of penetration resistance. The results suggest that partial shelterwood cuts may provide adequate light levels to achieve appropriate growth of underplanted Nothofagus seedlings. However, if regeneration of N. alpina is desired, scarification of topsoil needs to be implemented with more caution in canopy openings, as traffic and soil removal by heavy machinery can have detrimental effects on growth of this species and other species that are more sensitive to soil compaction.

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