Strength Behavior of Lateritic Soil Treated with Alccofine

One of the factors that affect the long term performance of a structure is the strength of the underlying soil strata. Presence of weak soil strata beneath the structure will affect the structural integrity. So, enhancing the engineering properties of the weak soil results in the betterment of bearing capacity of the soil. Nowadays, for improving the stability of the weak soil, various soil stabilization techniques are adopted. This paper presents an investigation of using alccofine as a soil stabilizing agent. Variation in shear strength parameters and compaction parameters of the soil is studied by adding different percentages of alccofine 1101 such as 1%, 2%, 3%, 4%, and 5%. Test results revealed that at the optimal rate of alccofine 1101, the shear strength characteristic is increased by 53.71% after a curing period of 3 days.

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Effects of Light Soaking Conditions on Thin Film Silicon:Hydrogen Alloy Solar Cells

MRS Proceedings ◽

10.1557/proc-70-599 ◽

1986 ◽

Vol 70 ◽

Author(s):

D. R. Willett ◽

D. P. Tanner ◽

G. Mchenry

Keyword(s):

Thin Film ◽

Solar Cells ◽

Light Intensity ◽

Environmental Conditions ◽

Operating Temperature ◽

Measurable Effect ◽

The Stability ◽

Long Term Performance ◽

Term Performance

ABSTRACTVariation of environmental conditions during light soaking of thin film silicon:hydrogen alloy (TFS) solar cells can have measurable effect on durability. Such sensitivity must be considered in optimizing processes for maximizing long-term performance. This paper will describe the effects of operating temperature, light intensity, operating bias, and duration of light soaking on the stability of TFS p-i-n solar cells.

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Material state changes as a basis for prognosis in aeronautical structures

The Aeronautical Journal ◽

10.1017/s0001924000003444 ◽

2009 ◽

Vol 113 (1150) ◽

pp. 789-798 ◽

Cited By ~ 18

Author(s):

K. L. Reifsnider ◽

P. Fazzino ◽

P. K. Majumdar ◽

L. Xing

Keyword(s):

High Performance ◽

Structural Integrity ◽

Future Performance ◽

Material State ◽

History Of ◽

Small Set ◽

History Of Use ◽

Long Term Performance ◽

Term Performance

Abstract The long-term performance of aeronautical structures is typically discussed in terms of concepts such as structural integrity, durability, damage tolerance, fracture toughness, etc. These familiar concepts are usually addressed by considering balance equations, crack growth relationships, and constitutive equations with constant material properties, and constant or cyclically applied load conditions. Loading histories are represented by changing stress (or strain) states, only. But for many situations, especially associated with high performance aircraft, the local state of the material may also change during service, so that the properties used in those equations are functions of time and history of applied conditions. For example, local values of stiffness, strength, and conductivity are altered by material degradation to create ‘property fields’ that replace the global constants, and introduce time and history into the governing equations. The present paper will examine a small set of such problems and offer a construct for using related solutions to estimate future performance based on history of use and current material state, a concept typically called prognosis.

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Influence of Engineering Properties of Porous Asphalt Concrete on Long-Term Performance

Journal of Materials in Civil Engineering ◽

10.1061/(asce)mt.1943-5533.0001768 ◽

2017 ◽

Vol 29 (4) ◽

pp. 04016246 ◽

Cited By ~ 9

Author(s):

Jian-Shiuh Chen ◽

Cheng-Te Lee ◽

Yen-Yu Lin

Keyword(s):

Asphalt Concrete ◽

Engineering Properties ◽

Porous Asphalt ◽

Long Term Performance ◽

Term Performance ◽

Porous Asphalt Concrete

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A Kinetic Model for the Stability of the Spent Fuel Matrix Under Oxic Conditions: Model Development Against Experimental Evidence

MRS Proceedings ◽

10.1557/proc-465-491 ◽

1996 ◽

Vol 465 ◽

Cited By ~ 4

Author(s):

Jordi Bruno ◽

E. Cera ◽

L. Duro ◽

T. E. Eriksen ◽

P. Sellin ◽

...

Keyword(s):

Kinetic Model ◽

Closed System ◽

Model Development ◽

Experimental Studies ◽

Experimental Information ◽

Spent Fuel ◽

The Stability ◽

Long Term Performance ◽

Term Performance

ABSTRACTA kinetic model recently developed [1] for the radiolytically induced oxidative dissolution of the spent fuel matrix is presented. This is based on experimental studies on the generation and evolution of radiolytic products in a closed system containing fragments of PWR-fuel [2]. The outcome of this model is currently being integrated in the present PA exercise being prepared by SKB. The calibration of the model against various experimental information and its predictive capabilities for the long term performance of the spent fuel matrix are presented.

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Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Periodica Polytechnica Chemical Engineering ◽

10.3311/ppch.13403 ◽

2019 ◽

Vol 64 (1) ◽

pp. 93-105 ◽

Cited By ~ 1

Author(s):

Djurdja Kerkez ◽

Dunja Radjenović ◽

Dragana Tomašević Pilipović ◽

Milena Bečelić-Tomin ◽

Nataša Slijepčević ◽

...

Keyword(s):

Structural Integrity ◽

Microstructural Analysis ◽

Product Formation ◽

Sem Analysis ◽

Polluted Sediment ◽

German Standard ◽

Long Term Performance ◽

Term Performance ◽

Over Time

The objective of this study is to enable a better understanding of the effectiveness of solidification/stabilization (S/S) technique in treating polluted sediment, and provide the much needed validation of the longevity of the technology. In this research kaolinite and montmorillonite, with a certain proportion of lime, were used for S/S treatment of sediment polluted with metals. Leachability of metals was examined using the toxicity characteristic leaching procedure (TCLP) and the German standard leaching test (DIN 3841-4 S4) prescribed in national legislative. Results indicated successful S/S treatment using both clays and lime, from the aspect of all leached metals even with pH variations over time and slight changes in structural integrity of specimens. X-ray diffraction (XRD), scanning electron microscope (SEM) analyses and porosity measurement were also performed on the prepared monolithic matrices. XRD qualitative and semi-quantitative analysis proved hydration and pozzolanic product formation with increase in their content and finer crystallites formation over time. SEM analysis confirmed the presence of morphologically dense and stable structures while pore size distribution indicated on mesoporous matrices with ongoing compaction over time. Generally, structural microanalysis indicated the formation of hardened matrices over time and hydration process has been fully completed and further carbonation took place. Unconfined compressive strength measurement gave the satisfying results and matured monolite with 30 % of montmorillonite and 10 % of lime can be considered potentially applicable as non-load-bearing material. In summary, all results indicated that this kind of S/S treatment can achieve satisfactory durability and represent reliable and economically feasible technique for long-term remediation of metal polluted sediment.

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Affects of Hydrogen Peroxide on the Stability of Becquerelite

MRS Proceedings ◽

10.1557/proc-0893-jj05-19 ◽

2005 ◽

Vol 893 ◽

Cited By ~ 3

Author(s):

Karrie-Ann Kubatko ◽

Daniel Unruh ◽

Peter C. Burns

Keyword(s):

Hydrogen Peroxide ◽

Spent Nuclear Fuel ◽

Yucca Mountain ◽

Geologic Repository ◽

Geological Repository ◽

The Stability ◽

Long Term Performance ◽

Term Performance ◽

Kinetics Of

AbstractWhile the majority of studies of alteration of UO2 and commercial spent nuclear fuel under simulated geological repository conditions have emphasized the importance of uranyl oxide hydrates and uranyl silicates, the influence of peroxide on repository performance has been largely overlooked. There is considerable evidence that uranyl peroxides will be important alteration phases of nuclear waste, and that these phases may impact the long-term performance of a geologic repository such as Yucca Mountain. Here we report the thermodynamics and kinetics of becquerelite, Ca[(UO2)6O4(OH)6](H2O)8, in the presence of solutions containing hydrogen peroxide. Thermodynamic calculations reveal that in solutions containing 3.5 × 10-6 M hydrogen peroxide, studtite is thermodynamically favorable over becquerelite at 298 K. To access the kinetics of this reaction, batch experiments were conducted by the reaction of becquerelite and solutions containing hydrogen peroxide. In the presence of 0.1 M hydrogen peroxide, becquerelite altered to studtite within eight hours.

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