scholarly journals Increasing the Durability of Asphalt Pavement - the Road to Road Safety

2021 ◽  
Vol 334 ◽  
pp. 01027
Author(s):  
Valentina Yadykina ◽  
Rashid Sharapov ◽  
Christina Pashkova ◽  
Anatoly Gridchin ◽  
Anna Trautvain
Keyword(s):  
Asphalt Concrete ◽  
Road Safety ◽  
Water Resistance ◽  
Experimental Studies ◽  
Softening Temperature ◽  
The Road ◽  
Fatigue Durability ◽  
The Impact ◽  
Positive Effect

Based on literature data, the paper analyzed the impact of transport operational indicators related to the quality of road surface coverage on road safety. It presented the results of experimental studies on the effect of the road adhesion cationic thermostable additive on the properties of bitumen and asphalt concrete. The authors identified that the introduction of this additive leads to an increase in the viscosity and softening temperature of bitumen, its adhesion to mineral materials, which has a positive effect on strength, water resistance, shear stability, crack resistance, fatigue durability of asphalt concrete. The conclusion was made about the regularity of improving road safety, related to the improvement of the quality of the pavement, arranged from asphalt concrete with the application of the tested additive.

scholarly journals Evaluation of the Brake’s Performance Dependence Upon Technical Condition of Car Tires as a Factor of Road Safety Management

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 9 ◽  
Author(s):  
Olga Orynycz ◽  
Karol Tucki ◽  
Andrzej Wasiak ◽  
Robert Sobótka ◽  
Arkadiusz Gola
Keyword(s):  
Road Safety ◽  
Safety Management ◽  
Road Transport ◽  
Technical Condition ◽  
The Road ◽  
Vehicle Inspection ◽  
Braking Process ◽  
Inspection Station ◽  
The Impact

The social cost, as one of the factors determining sustainability of socio-economic development, is strongly dependent upon a number of casualties and mortality in road accidents. The condition of car tires appears to be one of the important factors determining the occurrence of accidents. The vast majority of vehicles are tested every year at vehicle inspection stations. One of the elements affecting the result of the technical condition test and basically the quality of vehicle braking is the technical condition of the tires. Their technical condition is a very important factor responsible for the quality of acceleration, braking, maintaining, or changing the direction of driving. As a consequence, it has a significant impact on road safety. The aim of the study is to examine the impact of tires on the results of tests performed at a vehicle inspection station. The study presents the results of bench measurements of the impact of selected features of tire condition of two vehicles during routine periodic inspections at a vehicle inspection station (VIS). The focus was on an attempt to assess the impact of inflation pressure, age, and tire tread wear on the braking process. The technical studies performed might be a source for legal steps assuring better management of road safety. It can also be expected that the tire choice and condition may affect fuel consumption, and therefore the amount of energy consumed by the road transport.

scholarly journals CHANGE IN THE PROPERTIES OF ASPHALT CONCRETE WHEN USING HYDROPHOBIZED MINERAL POWDER

2020 ◽  
pp. 17-23
Author(s):  
V. Yadykina ◽  
E. Kuznetsova ◽  
M. Lebedev
Keyword(s):  
Asphalt Concrete ◽  
Water Saturation ◽  
Physical And Mechanical Properties ◽  
The Road ◽  
Operational Characteristics ◽  
Effect Of Treatment ◽  
Mineral Powder ◽  
Positive Effect

One of the main factors is the structure of asphalt concrete. The most important structural component in asphalt concrete is mineral powder, the quality of which depends on the technical and operational characteristics of the road surface. Different methods of processing mineral materials are used to improve the performance of asphalt concrete in Russia and abroad. In most cases, mechanical activation with organic substances is used during the grinding process. The article presents the results of research on the effect of treatment of mineral powder with the preparation GF-1 on its characteristics and on changes in the physical and mechanical properties of asphalt concrete, as well as on indicators for long-term water saturation. It is shown that as a result of modification, the mineral powder becomes hydrophobic, which has a positive effect on the physical and mechanical characteristics of asphalt concrete with its use. It is found that hydrophobization of mineral powder significantly reduces water saturation and swelling; increases water resistance during long-term water saturation (up to 90 days) of asphalt concrete samples. As a result of hydrophobization, the temperature sensitivity of asphalt concrete increases significantly. Therefore, the composite will work reliably in a wider temperature range.

scholarly journals EXAMINATION OF THE QUALITY OF NANOMATERIALS IN THE DEVELOPMENT AND APPLICATION OF CIRCULATING RESOURCES IN CONSTRUCTION

2022 ◽  
Vol 4 (6) ◽  
pp. 48-68
Author(s):  
S. Plehanova ◽  
N. Vinogradova
Keyword(s):  
Service Life ◽  
Structural Strength ◽  
Experimental Studies ◽  
Measurement Methods ◽  
Road Surface ◽  
Rigid Pavement ◽  
The Road ◽  
The Impact ◽  
Disad Vantage

the advantage of the equality indicator is the relative simplicity of definition and the possibility of periodic moni-toring. According to the equality indicator, it is possible to assign repairs and predict the service life, assess the condition of the road surface. Experimental studies have proved that there is a connection between the evenness of the coating and the strength of the pavement, which opens up the possibility of determining the structural strength of non-rigid pavement, which provides a given evenness of the coating for the last year of operation be-fore major repairs. The question of assessing the impact of the unevenness of the road surface on the processes of development and accumulation of deformations, changes in the evenness of the coating during operation remain largely open. This is due to the multifactorial nature of the problem of predicting the equality of coverage, so it is advisable to use approaches based on direct measurement methods. Most of the existing models of interaction of a pneumatic or rigid wheel with a coating are designed for problems of pavement mechanics or car theory, therefore they cannot be unambiguously applied to determine the value of the dynamism coefficient. A significant disad-vantage of these solutions is insufficient consideration of the deformative properties (modulus of elasticity) of the pavement.

Increasing the Efficiency of Asphalt by Introducing Additives Containing Polyphosphoric Acid

2016 ◽  
Vol 677 ◽  
pp. 128-132
Author(s):  
Valentina V. Yadykina ◽  
Christina Pashkova
Keyword(s):  
Asphalt Concrete ◽  
Polyphosphoric Acid ◽  
Water Saturation ◽  
Seasonal Temperature ◽  
Temperature Changes ◽  
The Road ◽  
Road Pavement ◽  
High Standards ◽  
Positive Effect

Bitumen modified by polyphosphoric acid (PPA), as well as in combination with polymers and is widely used for production of road bitumen, which correspond to high standards. Therefore, the aim of this work is to study the influence of the properties of the polyphosphoric acid with different contents of phosphorous oxide (P2O5) and a derivative of them based additives esters of polyphosphoric acid and synthetic phospholipids DAD-KT, developed by "Selena".The influence of these additives on the change of adhesive, cohesive properties of bitumen, as well as on the properties of asphalt concrete to change of the limits of the crushing stress, water saturation and long waterproof. The use of additives had a positive effect on the adhesion of bitumen with mineral material. The index of cohesion increased with the addition of DAD-KT, more than 80%. This is due to the presence in its structure of the polymer.In connection with the increase of adhesion and cohesion of asphalts modified polyphosphoric acid, asphalt concrete prepared with these binders should be characterized by the increased values of water, heat and frost resistance and resistance to rutting.Study of the influence of additives on the physico-mechanical characteristics of asphalt concrete shows a positive effect on the properties of the latter. So the strength of asphalt concrete at 20 °C has risen on average by 10 % relative to the initial bitumen without additives, the strength at 50 °C by 15 %, the strength at 0 °C decreased by 8-12 %, the water saturation decreased by 30-40 %, indicating that the decrease in porosity of asphalt concrete and increase the durability of asphalt to seasonal temperature changes. In turn, the resistance increased by 5-8 % relative to the bitumen without additives. Long resistant with additives also increased which can be explained by the improvement of adhesion of bitumen with mineral materials of asphalt concrete. So the resistance after 15 days of the original bitumen and bitumen with additives decreased by 15 and an average 5 %, respectively, after 30 days at 25 and 7 % respectively. It can be concluded that in the modification of bitumen polyphosphoric acid, and in particular the addition of DAD-KT, there has been a significant improvement in the properties of bitumen and asphalt concrete. Therefore, it is possible to expect the improvement of the quality of the road pavement made of asphalt, with the use of additives containing polyphosphoric acid, in particular - DAD-KT.

scholarly journals Experimental investigation of an asphalt concrete mixture cooling characteristics with the aim of reducing heat loss during transportation from the asphalt plant to the roadbed construction site

2018 ◽  
Vol 5 (4) ◽  
Author(s):  
Khizar Dzhabrailov ◽  
Magomed-Emi Soltamuradov ◽  
Salam Gaziev
Keyword(s):  
Asphalt Concrete ◽  
Federal Budget ◽  
Concrete Mixture ◽  
Concrete Pavements ◽  
Existing Building ◽  
The Road ◽  
Existing Structures ◽  
Strict Compliance ◽  
Positive Effect

In connection with the sharp increase in the traffic flow, the problem of the durability of asphalt concrete pavements comes to the fore – their ability to maintain their properties within a certain period of time within certain limits. In many respects, the quality of future coverage is laid by the adaptability of the laying process, strict compliance with the requirements of project documentation and existing building codes and regulations (SNiP, GOST, ISO, etc.). However, the technology itself of the process of making asphalt concrete pavements is constantly evolving – new complexes are emerging, changes are being introduced to existing structures of machines for building coatings. Addition, reduction and combination of operations of the technological process, including, against the background of improving the quality and, as a result, the durability of the coating, reduce the complexity of the work performed, reduce the number of necessary staff – all of this has a positive effect on the economic component of construction, frees up additional funds. And, as you know, there is already enough evidence that the main factor hindering the development of the road network in the Russian Federation is, just the same, the need to spend huge budget funds (in 2016, about 30 billion rubles were allocated from the federal budget to repair existing roads due to their poor condition). In turn, the road-building industry, which is developing at a high pace, sets stringent requirements to ensure the required level of quality throughout the entire process, starting from the places of production of asphalt-concrete mixture (ABZ).

scholarly journals The impact of regular sperm donation on bulls’ seminal plasma hormonal profile and phantom response

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alicja Kowalczyk ◽  
Elżbieta Gałęska ◽  
Ewa Czerniawska-Piątkowska ◽  
Anna Szul ◽  
Leszek Hebda
Keyword(s):  
Seminal Plasma ◽  
Sperm Donation ◽  
Hormonal Profile ◽  
Holstein Friesian ◽  
Different Seasons ◽  
Day Of The Week ◽  
The Impact ◽  
The Relationship ◽  
Positive Effect

AbstractThe aim of this study was to analyze the relationship between the concentration of hormones in the seminal plasma, the bull maintenance system in the insemination station, and the regularity of sperm donation and the response to the phantom (libido level). An additional goal was to determine whether there is a relationship between the hormonal profile in the blood, the sperm plasma, the oxidative and antioxidant profile in the blood of bulls and the biometry of their testicles and scrotum, as well as the quality of their sperm in both different seasons and intensities of reproductive use. For the study, 220 healthy and sexually mature Polish Holstein–Friesian bulls were used. They all had normal libido and were fed equally. The animals were grouped according to the scheme: young (16–20 month/n = 60) and old (26–30 month/n = 60) including: individually housed (n = 30) and group housed (n = 30) young, old individually housed (n = 30) and group housed (n = 30) (n total animals = 120); young animals donating semen once a week (every Thursday) (n = 25) and sporadically (once every two months on a random day of the week) (n = 25), old animals donating semen once a week (every Thursday) (n = 25 ) and sporadic donors (once every two months on a random day of the week) (n = 25) (n total animals = 100). When analyzing the results of this study, it should be stated that regular use has a positive effect on the secretion of sex hormones in bulls. Higher levels of testosterone and lower levels of estradiol and prostaglandins resulted in higher sexual performance, expressed by a stronger response to the phantom. The differences in favor of regular use were independent of the bull's age. The results of our research illustrate that the quality of semen and its freezing potential may depend on the season and frequency of its collection, as well as on the age of the males.

scholarly journals Study for the Design of a Protocol to Assess the Impact of Stress in the Quality of Life of Workers

2021 ◽  
Vol 18 (4) ◽  
pp. 1413
Author(s):  
Patricia Concheiro-Moscoso ◽  
Betania Groba ◽  
Francisco José Martínez-Martínez ◽  
María del Carmen Miranda-Duro ◽  
Laura Nieto-Riveiro ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Occupational Stress ◽  
Categorical Variables ◽  
Complete Study ◽  
Stress Coping Strategies ◽  
Personal Level ◽  
Stress Influences ◽  
The Impact ◽  
Positive Effect

(1) Background: Work stress is one of the most relevant issues in public health. It has a significant impact on health, especially the development of mental disorders, causing occupational imbalance. There is a growing interest in the development of tools with a positive effect on workers. To this end, wearable technology is becoming increasingly popular, as it measures biometric variables like heartbeat, activity, and sleep. This information may be used to assess the stress a person is suffering, which could allow the development of stress coping strategies, both at a professional and personal level. (2) Methods: This paper describes an observational, analytical, and longitudinal study which will be set at a research center in A Coruña, Spain. Various scales and questionnaires will be filled in by the participants throughout the study. For the statistical analysis, specific methods will be used to evaluate the association between numerical and categorical variables. (3) Discussion: This study will lay the foundation for a bigger, more complete study to assess occupational stress in different work environments. This will allow us to begin to understand how occupational stress influences daily life activity and occupational balance, which could directly enhance the quality of life of workers if the necessary measures are taken.

Impact of Lockdown on Health of the Yamuna river at Delhi Stretch, India

2021 ◽  
Vol 27 (1) ◽  
Author(s):  
MANOJ KUMAR SHUKLA
Keyword(s):  
Water Quality ◽  
Industrial Waste ◽  
Quality Parameters ◽  
Domestic Sewage ◽  
Pollution Monitoring ◽  
Yamuna River ◽  
Industrial Pollutants ◽  
The Impact ◽  
Positive Effect

Present study points out the impact of Lockdown on the health of the Yamuna river at Delhi stretch by comparing prelockdown and Post-lockdown period by studying the reports of pollution monitoring agencies. Delhi segment of the Yamuna is highly polluted, where alongwith domestic sewage a huge quantity of industrial waste is being discharged continuously without proper treatment. Pre lockdown (March 2020) water quality parameters at three sampling stations named as Palla, Nizammuddin Bridge and Okhla barrage U/s in Delhi were, pH were 8.7, 7.3 and 7.2, DO were 17.1 mg/L, not detected in later two sites, BOD were 7.9 mg/L, 57 mg/L and 27 mg/L and COD were 28 mg/L, 90 mg/L and 95 mg/L respectively and postlockdown period (April 2020) the pH was 7.8, 7.2 and 7.1, DO was 8.3 mg/L, 2.4 mg/L and 1.2 mg/L BOD was 2 mg/L, 5.6 mg/ L and 6.1 mg/L and COD were 6 mg/L, 16 mg/L and 18 mg/L respectively. The study of these parameters at three sampling stations reveals that the lack of industrial pollutants discharging due to nationwide lockdown for COVID-19 pandemic had positive effect on water quality of this river. Water quality could be maintained by planned establishment of industries and setup of ETP with without gap between generation and treatment.

scholarly journals Impact of eating disorders on paid or unpaid work participation and performance: a systematic review and meta-analysis protocol

2022 ◽  
Vol 10 (1) ◽  
Author(s):  
Fatima Safi ◽  
Anna M. Aniserowicz ◽  
Heather Colquhoun ◽  
Jill Stier ◽  
Behdin Nowrouzi-Kia
Keyword(s):  
Systematic Review ◽  
Eating Disorders ◽  
Meta Analysis ◽  
Experimental Studies ◽  
Work Participation ◽  
Unpaid Work ◽  
Cochrane Library ◽  
And Performance ◽  
The Impact

Abstract Background Eating disorders (ED) can reduce quality of life by limiting participation and performance in social and occupational roles, including paid or unpaid work. The association between ED pathologies and work participation and performance must be well understood to strengthen vocational rehabilitation programmes and prevent occupational disruptions in the ED population. The aims of this study are: (1) to examine the degree of association between ED pathologies and work participation and performance in 15-year-olds and older; (2) to highlight the specific ED symptoms that are most correlated with changes in work performance and participation; (3) to compile the most common metrics and assessments used to measure work participation and performance with ED. Methods Medline, Embase, CINAHL, Web of Science, PsycINFO, and Cochrane Library will be searched for observational and experimental studies that meet the following criteria: (1) a clinical sample of typical or atypical ED; (2) paid or unpaid employment or training; (3) an association between ED pathologies and work participation or performance. Unpublished data will also be examined. Title and abstract, and full-text screening will be conducted in duplicate. Risk of bias and quality of evidence assessments will be completed. A random-effect meta-analysis will be performed. Discussion This synthesis can clarify knowledge and gaps around the impact of ED on work functioning, thereby allowing better evaluation, improvements and development of current workplace assessments, interventions, and policies. Trial registration The registration number for this systematic review on PROSPERO is CRD42021255055.

scholarly journals Studi Penggunaan Plastik Polypropylene pada Campuran Asphalt Concrete-Wearing Course

CANTILEVER ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 65-71
Author(s):  
Lie Ing Tan ◽  
Wildan Reza Pahlevi
Keyword(s):  
Asphalt Concrete ◽  
Traffic Accidents ◽  
The Road ◽  
Test Parameters ◽  
Marshall Test

The quality of implementation, drainage, materials that do not meet the standards, and overloaded from the specified class of roads are the main causes of road damage. Thus violations and negligence both in the implementation or maintenance of the road can cause a lot of traffic accidents, damage to vehicles, and various things that can disrupt the comfort and safety of drivers or pedestrians. The purpose of this study was to evaluate the effect of polypropylene plastic as an additive in the Asphalt Concrete-Wearing Course (AC-WC) layer. The use of polypropylene waste used as an additive is around 2.5%; 3.5%; 4.5%; and 5.5% of the asphalt weight. Based on the results of the analysis it was concluded that the mixture of AC-WC with the addition of polypropylene plastic experienced increased stability and decreased melting. Polypropylene plastic which can be used based on the five Marshall test parameters with the highest value of stability and lowest melting is 4.5% of the weight of asphalt.

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