scholarly journals Monitoring the strength properties of electrokinetically treated soil by bender elements to determine the treatment period

2021 ◽  
Author(s):  
Colin Hunter ◽  
Eltayeb Mohamedelhassan ◽  
Ayan Sadhu
Keyword(s):  
Treatment Period ◽  
Strength Properties ◽  
Bender Elements ◽  
Treated Soil

LONG TERM UNCONFINED COMPRESSIVE STRENGTH PROPERTIES OF CEMENT-TREATED SOIL

2019 ◽  
Vol 75 (2) ◽  
pp. I_845-I_850
Author(s):  
Kazutaka UENO ◽  
Kiyonobu KASAMA ◽  
Yasuyuki NAKAGAWA ◽  
Takashi NEGI ◽  
Masaharu MINAMI ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Strength Properties ◽  
Treated Soil

Effect of Rice Husk Ash Treatment on the Strength Properties of Oil Contaminated Soils

2013 ◽  
Vol 824 ◽  
pp. 59-65
Author(s):  
Thomas Stephen Ijimdiya
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Contaminated Soils ◽  
Unconfined Compressive Strength ◽  
Rice Husk Ash ◽  
Evaluation Criteria ◽  
Dry Weight ◽  
Strength Properties ◽  
Treated Soil ◽  
Relative Compaction

Oil contaminated soils (PCS) was treated with up to 6% rice husk ash (RHA) by dry weight of soil. Specimens of treated soil compacted at the energy of the standard Proctor (relative compaction = 100%) were subjected to compaction, unconfined compressive strength (UCS) and California bearing ratio (CBR) tests. The results of laboratory tests show that properties of the treated soil improved with RHA treatment. Peak unconfined compressive strength value of 410kN/m2 was obtained at 2% oil/ Applying the conventional evaluation criteria reveals that soil-oil RHA mixture containing 2% oil/4% RHA, 4% oil/4% RHA and 6% oil/4% RHA yields optimum CBR values of 4.6, 4.4 and 3.5% which does not satisfy the minimum required CBR of 15% for use as a subgrade material in road foundation.

scholarly journals BEARING CAPACITY OF STRIP FOOTING ON LIME STABILIZED EXPANSIVE CLAYEY SOIL

2019 ◽  
Vol 26 (3) ◽  
pp. 43-50
Author(s):  
Amina A. Khalil ◽  
Mohammed N J Alzaidy ◽  
Zeena A. Kazzaz
Keyword(s):  
Bearing Capacity ◽  
Clayey Soil ◽  
Ph Value ◽  
Strength Properties ◽  
Engineering Properties ◽  
Natural Soil ◽  
Swelling Potential ◽  
Treated Soil ◽  
Stabilized Soil ◽  
Lime Addition

To investigate and understand the effect of lime on the engineering properties of an expansive clayey soil, 4% lime by weight of the dry soil have been added. The stabilized soil specimens were subjected to unconfined compression, swelling potential and pH value tests. Also, a finite element analyses using PLAXIS-2D software were conducted. The studied parameters include the footing size and thickness of lime stabilized soil, and then compared with the natural soil. It was proved that lime content and curing duration had a significant effect on the engineering properties of lime-treated soil. The curing duration had significantly enhanced the strength properties of the lime stabilized soil specimens, where, unconfined compressive strength has significantly improved. Also, the pH value was decreased with increasing curing durations. Moreover, it was found that the swelling potential of the lime-treated soil specimens was reduced by lime addition and increasing of the curing duration. The results of numerical analysis show that the stress-settlement behaviour and ultimate bearing capacity of footing can be considerably enhanced as the thickness of lime-treated increases, and the influence of footing width seems to be insignificant.

SEM Study of Tension Wood Fiber Morphology and its Effect on Paper Properties

1977 ◽  
Vol 35 ◽  
pp. 308-309
Author(s):  
K. W. Robinson
Keyword(s):  
Tension Wood ◽  
Wood Fiber ◽  
Strength Properties ◽  
Fiber Morphology ◽  
Paper Properties ◽  
Pure Cellulose ◽  
Short Rotation ◽  
Hardwood Trees ◽  
Sem Study

Tension wood (TW) is an abnormal tissue of hardwood trees; although it has been isolated from most parts of the tree, it is frequently found on the upper side of branches and leaning stems. TW has been classically associated with geotropic alignment, but more recently it has been associated with fast growth. Paper made from TW is generally lower in strength properties. Consequently, the paper industries' growing dependence on fast growing, short- rotation trees will result in higher amounts of TW in the final product and a corresponding reduction in strength.Relatively few studies have dealt with the role of TW in the structure of paper. It was suggested that the lower strength properties of TW were due to a combination of factors, namely, its unique morphology, compression failures in the cell wall, and lower hemicellulose content. Central to the unique morphology of the TW fiber is the thick gelatinous layer (G-layer) composed almost entirely of pure cellulose.

Causes and the way of treatment of patients with chronic leg ulcers

Phlebologie ◽  
2009 ◽  
Vol 38 (05) ◽  
pp. 211-218 ◽  
Author(s):  
C. Wax ◽  
A. Körber ◽  
J. Dissemond ◽  
J. Klode
Keyword(s):  
Treatment Period ◽  
General Practitioners ◽  
Peripheral Arterial Occlusive Disease ◽  
Mean Value ◽  
Arterial Occlusive Disease ◽  
Leg Ulcer ◽  
Leg Ulcers ◽  
Patient Will ◽  
Peripheral Arterial ◽  
Chronic Leg Ulcers

SummaryChronic leg ulcer may have various causes, which are currently not centrally recorded in Germany. It is also unclear who treats patients with chronic leg ulcers in Germany and how the basic implementation of diagnosis and treatment of these patients looks like. Patients, methods: Therefore, we started a survey of 1000 general practitioners and practising specialists in dermatology, surgery and phlebology in five different regions of Germany. We carried out the genesis of a total of 6275 patients from 62 different practising therapists, 33 specialists in dermatology, surgery or phlebology and 29 general practitioners. Results: In 66.1% of all patients we found a venous leg ulcer, in 9.1% a leg ulcer from peripheral arterial occlusive disease, and in 8.5% a mixture of both. Thus there suffered a total of 83.8% of patients on chronic venous insufficiency or peripheral arterial occlusive disease as a major factor in the genesis of the chronic leg ulcer. However, even the rarely diagnosed entities such as exogenous factors, vasculitis, pyoderma gangrenosum or infectious diseases are occur in summation in 16.2% of all patients and should therefore be known and excluded. In addition, the treatment periods and referral routes of patients with chronic leg ulcer should be identified. The analysis showed that the vast majority (86.8%) of patients with chronic ulcers who were investigated by us is treated by specialists. The treatment duration of general practitioners is 6.3 weeks (mean value) before the patient will be referred to a specialist. This treatment period is significantly shorter compared to the treatment period of the specialists, who treat their patients 14.1 weeks (mean value) before the patient will be referred to another specialist or to a clinic. Conclusion: Our results show the current aspects of aetiology and the way of treatment of patients with chronic leg ulcers in Germany.

Co-cooking nonwoods with hardwoods

TAPPI Journal ◽  
2014 ◽  
Vol 13 (6) ◽  
pp. 19-24
Author(s):  
TROY RUNGE ◽  
CHUNHUI ZHANG
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Strength Properties ◽  
Agricultural Residues ◽  
Kraft Pulping ◽  
Pulp And Paper ◽  
Strength Increase ◽  
Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

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