scholarly journals Analysis of the resilience modulus of a subgrade soil front of humidity variations

2021 ◽  
Vol 337 ◽  
pp. 03013
Author(s):  
Camila Kern ◽  
Wai Ying Yuk Gehling ◽  
Washington Peres Núñez
Keyword(s):  
Moisture Content ◽  
Negative Impact ◽  
Statistical Significance ◽  
Great Influence ◽  
Subgrade Soil ◽  
High Statistical Significance ◽  
Moisture Variation ◽  
Repeated Load ◽  
Effect Of Moisture ◽  
Repeated Load Triaxial

The influence of the variation of moisture content in the materials that make up the pavement has a negative impact on its performance. This variation in humidity is caused by inefficient drainage, oscillation of the water table, infiltrations, which affect the resistance and increase the deformability. The objective of this article is to evaluate the effect of moisture variation on the behavior of soils used in pavement subgrade from tests of resilience module. The subgrade of the highway BR-290/RS located in the state of Rio Grande do Sul/Brazil was evaluated. The repeated load triaxial equipment was used to perform tests of the Resilience Module (MR), varying the moisture content of the specimens by ± 2% in relation to the optimum humidity. There was a 70% decrease in MR comparing specimens above the optimum humidity with the ideal humidity conditions. A new MR equation was proposed that considers the variation in humidity, which showed high statistical significance. The results presented showed a great influence of the moisture content in soils, showing that the present article can contribute to a better understanding of the behavior of soils and a greater discussion about the effect of moisture variation in the dimensioning of pavements.

scholarly journals The Effect of Moisture Content of Black Locust Wood on the Heating in the Saturated Water Steam during the Process of Colour Modification

2018 ◽  
Vol 168 ◽  
pp. 06004
Author(s):  
Ladislav Dzurenda
Keyword(s):  
Moisture Content ◽  
Black Locust ◽  
Negative Impact ◽  
Heating Time ◽  
Mode I ◽  
Mode Iii ◽  
Water Steam ◽  
Saturated Water ◽  
Sawn Timber ◽  
Effect Of Moisture

The effect of moisture content of black locust wood on the heating of sawn timber with the thickness of h = 32 mm in saturated water steam during the processes of colour modifications by modes: mode I – temperature of saturated water steam t = 112 ± 2.5 °C for τ = 5.5 hours, mode II – temperature of saturated water steam t = 127 ± 2.5 °C for τ = 6.5 hours, and mode III – temperature of saturated water steam t = 137 ± 2.5 °C for τ = 7.5 hours is analysed in the paper. The increase in moisture content affects the heating time, it lasts longer. When the moisture content of black locust wood ranges from W = 60 – 65 %, the heating time by modes I – III did not last longer than the time Δτ ≤ 0.5 min. and no negative impact on the final colour modification is observed.

scholarly journals Use of slag (with cement) for improving the performance of expansive soil of road pavement subgrade

2019 ◽  
Vol 276 ◽  
pp. 05002
Author(s):  
Agus Ika Putra ◽  
Mohamed A. Shahin
Keyword(s):  
Unconfined Compressive Strength ◽  
Laboratory Tests ◽  
Expansive Soil ◽  
Curing Time ◽  
Road Pavement ◽  
Subgrade Soil ◽  
Stabilized Soil ◽  
Repeated Load ◽  
Repeated Load Triaxial ◽  
Selection Of

The study presented in this paper evaluates the suitability of using slag (with cement) as a stabilizer, for improving the performance of expansive subgrade soil in road pavement. Several laboratory tests were conducted to determine the geotechnical engineering characteristics of the expansive soil and associated mechanical engineering performance. The tests conducted include the particle size distribution, standard Proctor compaction, Atterberg’s limits, free swelling, permeability, California bearing ratio (CBR), unconfined compressive strength (UCS), and repeated load triaxial (RLT). In this study, the use of slag (with cement) as a stabilizer followed three proportion schemes, and the selection of a specific stabilizer proportion was determined based on UCS value that satisfies the required standard as a subgrade for road pavement. The results recommended a stabilizer proportion for the soil studied to be 13.5% slag + 1.5% cement at 28 days curing time. This mixture resulted in a remarkable increase in the UCS value of eight times higher than the UCS value of the non-stabilized soil. The CBR value of the mixture was four times higher than the minimum required value for design of road pavement. The study presented herein confirmed that the exploitation of the by-product material of slag can indeed be useful, both in terms of improving the performance of the subgrade soil for road pavement and sparing the environment a spread of significant potential pollutant.

THE INFLUENCE OF SELECTED FACTORS UPON THE VALUE OF EXTERNAL FRICTION CONCERNING PLANT GRANULAR MATERIALS

Tribologia ◽  
2017 ◽  
pp. 107-113 ◽  
Author(s):  
Artur WÓJCIK ◽  
Jarosław FRACZEK
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Granular Materials ◽  
Friction Force ◽  
Statistical Significance ◽  
Sliding Velocity ◽  
Seed Moisture Content ◽  
Seed Moisture ◽  
High Statistical Significance ◽  
Insight Into

The issues relating to the description of friction with regard to plant granular materials are fairly complicated due to a variety of factors determining the process. Considering each factor in isolation is insufficient and offers a limited insight into the phenomenon of friction. Therefore, the paper presents the research results concerning the influence of three independent factors (seed moisture content, sliding velocity, load) upon the value of friction force. The analysis showed the high statistical significance of the factors at play. The proposed mathematical model proved well fitted (considering granular materials) to the observed outcome of the measurements.

scholarly journals Assessing Tax Potential of Regions

2021 ◽  
Vol 04 (11) ◽  
Author(s):  
Aytbay Orazbaevich Madreimov ◽  
Keyword(s):  
Small Businesses ◽  
Negative Impact ◽  
Statistical Significance ◽  
Tax Revenues ◽  
Factors Influencing ◽  
High Statistical Significance ◽  
Fixed Assets ◽  
The Impact

This article is devoted to the consideration of methods for assessing tax potential of regions, as well as the factors impacting tax potential. The aim of the research is to review approaches designated to determining the essence of the tax potential concept, as well as to study the factors influencing thereupon. In the process of assessing tax potential of the regions in the analysis, we use the data on budget revenues by region for 2008-2020, regional GDP, investments in fixed assets, tax arrears and the number of operating taxpayers. The analysis of the panel revealed that the impact of regional GDP on agriculture and industry on tax revenues was positive, there has been observed high statistical significance and negative impact on the number of small businesses. As a result of the analysis, appropriate conclusions on important aspects of assessing tax potential of the regions have been formulated.

scholarly journals Effect of moisture content of cohesive subgrade soil

2018 ◽  
Vol 195 ◽  
pp. 03010 ◽  
Author(s):  
Adnan Zainorabidin ◽  
Dian Hastari Agustina
Keyword(s):  
Moisture Content ◽  
Clay Soil ◽  
Resilient Modulus ◽  
Traffic Load ◽  
Wheel Load ◽  
Road Pavement ◽  
Subgrade Soil ◽  
Strain Behaviour ◽  
Effect Of Moisture ◽  
The Difference

A good subgrade for road pavement is required to support the traffic load that passes through. The characteristics of the subgrade is determined by the stress-strain behaviour that is expressed as a resilient modulus. The performance of the pavement is affected by characteristics of the subgrade. Characteristics of clay soil generally have a low of bearing capacity, especially to support the load induced by the wheel load of vehicles. Clay soil is very sensitive to changes of temperature and moisture content. The changes of moisture content cause the changes on the subgrade‚s resilient modulus value. This paper studies the resilient modulus of the subgrade of clay soil by laboratory testing. To investigate the effect of moisture content, this testing is done on a dry side, OMC condition and wet side. The result shows the difference of the resilient modulus characteristic and deformation that is influenced by the moisture content.

The importance of some life events to depresion of patients with cardio- surgery intervention (aorto-coronary bypass)

2011 ◽  
Vol 26 (S2) ◽  
pp. 376-376
Author(s):  
L. Damjanovik ◽  
Z. Mitrev ◽  
T. Ristova Dimova
Keyword(s):  
Life Events ◽  
Multidisciplinary Approach ◽  
Statistical Significance ◽  
Great Influence ◽  
Depression Scale ◽  
Coronary Bypass ◽  
Average Score ◽  
Good Recovery ◽  
High Statistical Significance ◽  
The Family

IntroductionThe cardiovascular desease is the great reason for mortality of the patiens. The comorbidity with the depression have a great influence of the incidence, morbidity and mortality. Some live events make the depression efects worse for the patient who take cardio-surgery treatment.Aimsis to find the importance of some life events to depression of the patients with cardio-surgery intervention.MethodsIn this study there was 30 patients, hospitalised at Cardiosugery Hospital Filip II, Skopje for cardio-surgery intervention (aorto-coronary by pass), 38–79 age, both male and female. These psychiatric instuments were used:Hamilton depression scale (HAMD), (17 itema scale with max score 52 and minimal score 0) and Scale for living stres factors of Holms and Rahe.ResultsThe average score of depression preoperation on HAMD scale is 16.77 ± 8.05, and the postoperation score were incresed to 21,25 and is high statistical significance (p < 0.01).The some events like death of member of the family, the illness, a big finansical changes significantly increace the depression (p < 0.01), but a newborn in the family, the holidays significantly decrese the depression on the participants (p < 0.05).ConclusionsMultidisciplinary approach with the team of psyciatrists, psychologist of patient with cardiovascular desease make the despression efects small and the patients have good recovery.

scholarly journals Effects of Density and Moisture Variation on Dynamic Deformation Properties of Compacted Lateritic Soil

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Weizheng Liu ◽  
Shuai Qu ◽  
Zhihong Nie ◽  
Junhui Zhang
Keyword(s):  
Moisture Content ◽  
Empirical Relationship ◽  
Cyclic Stress ◽  
Lateritic Soil ◽  
Triaxial Tests ◽  
Permanent Strain ◽  
Moisture Variation ◽  
Deformation Properties ◽  
Critical Dynamic ◽  
Repeated Load Triaxial

A series of repeated load triaxial tests were conducted in this study to investigate the influences of compaction density and postcompaction moisture variation on the dynamic elastic modulus (Ed) and plastic permanent strain (PPS) of compacted lateritic soil. Specimens were compacted at optimum moisture content (OMC) and three degrees of compaction (90%, 93%, and 96%). Then the specimens were dried or wetted to different moisture contents (OMC,OMC±3%,OMC±6%, andOMC+9%) prior to testing forEdand PPS. Results show that moisture content has greater influence on theEdand PSS than compaction degree, and the increase in moisture content leads to a decrease ofEdand an increase of PPS. Furthermore, an empirical relationship betweenEdand applied cyclic stress (σd) is developed that incorporates density and moisture variations. Three different evolution types of PPS with number of load cycles, plastic stable, plastic creep, and incremental collapse, are identified as the increase of moisture content. In addition, the critical dynamic stress (σdc) separating stable and unstable deformation is determined based on the shakedown concept. The envelope curves ofσdc-moisture of lateritic soil with different degrees of compaction are also determined to provide reference for the pavement design.

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