Suppressing the Hydrogen Sulfide and Sulfur Dioxide Emission from Sulfur-Bituminous Concrete

2014 ◽  
Vol 1040 ◽  
pp. 387-392 ◽  
Author(s):  
Vitaliy A. Gladkikh ◽  
Evgeniy Valerjevich Korolev
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfur Dioxide ◽  
Building Materials ◽  
Road Construction ◽  
Safety Requirements ◽  
Bituminous Mixtures ◽  
Toxic Gases ◽  
Sulfur Dioxide Emission ◽  
Bituminous Concrete

There are numerous advantages of building materials based on sulfur-bituminous binder. Using the sulfur-bituminous concretes in road construction leads to improved quality of pavements. In particular, there is an increase of resistance to rutting when extending the bituminous concretes with sulfur. The well-known difficulty limiting the widespread practical use of the sulfur-bituminous concretes is the emission of toxic gases – hydrogen sulfide and sulfur dioxide – which are formed during the manufacture and installation of sulfur-bituminous concrete. The present paper is devoted to the said problem. The survey of processes occurring in sulfur-bituminous mixtures is carried out. This allowed us to select most prospective suppressors for toxic gases emitted during the production and laying of sulfur-bituminous concrete. Series of laboratory tests are made to proof our choice. The results of tests confirm that oxides of amphoteric metals neutralizers are effective suppressors for hydrogen sulfide and sulfur dioxide, while carbon only slightly reduces the emissions. The emission is primarily depends on temperature and water content. Therefore, we recommend not to exceed 145 °C during the production and laying. Components for asphalt must be dehydrated, and sulfur must be degassed. If these requirements are met, than production process of sulfur-bituminous concrete will meet the safety requirements.

scholarly journals The use of stabilizers to improve the strength of the soil foundation of roads

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Rashidbek Hudaykulov ◽  
Tokhirjan Mirzayev
Keyword(s):  
Building Materials ◽  
Harmful Effect ◽  
Road Construction ◽  
Maintenance And Repair ◽  
Loess Soils ◽  
Strength And Deformation ◽  
Time Savings ◽  
Soil Foundation ◽  
Stability Of Water

This article describes the improvements, strength and deformation characteristics of loess soils used in the construction of road pavements with a stabilizer T-RRP. With the help of laboratory analyzes, a recommendation was developed on the use of stabilizers to improve the properties of loess soils used in the calculation of the pavement design. The use of stabilizers in road construction, in particular T-RRP, gives the following advantages: 1. Time savings during construction; 2. Saving ordinary building materials; 3. Shipping costs are eliminated; 4. Saving financial work afterwards; 5. Lack of repair later; 6. Minimal use of machines. 7. Minimal use of working force. The degree of adequacy of the project. Interested enterprises in the project are: LLC «FAYANTRANS», PEC «Avtomagistral», SRRCO «Uzavtoyul». The significance of the final results: the proposed methods of road construction, compared with traditional methods, gives the following advantages: the permissible load on roads constructed with the use of stabilizers in more than doubled compared to roads built in the usual way; reducing the thickness of the pavement by more than 25 % on the soil treated with stabilizers; built with the use of stabilizers roads increase their strength year after year; strength and stability of water-physical properties of clay soils used in the construction of roads, airfields, hydraulic structures; building with the use of stabilizers meets the requirements of ecology since it doesn’t produce harmful effect on groundwater. In addition to the advantages noted above, the use of stabilizers allows: increase the service life of coatings; get savings on maintenance and repair; increase the pace of construction; improve the quality of structures being built.

scholarly journals Characterization of Bitumen Binders on the Basis of Their Thermo-Viscous Properties

2019 ◽  
Vol 27 (1) ◽  
pp. 25-31
Author(s):  
Michal Holý ◽  
Eva Remišová
Keyword(s):  
Building Materials ◽  
Road Construction ◽  
Climate Conditions ◽  
Traffic Loads ◽  
Bituminous Binders ◽  
Empirical Tests ◽  
And Behavior ◽  
Temperature Susceptibility

Abstract Bitumen is one of the basic building materials that is mainly used in road construction. Nowadays, we can observe increased requirements for the quality of bituminous binders, which are due to increased traffic loads, changing climate conditions, and decreasing crude oil stocks. Besides “traditional” (empirical) tests (softening point, penetration), new types of tests have been developed that can better describe the quality and behavior of bitumen binders. Their composition can also be a significant part of the properties themselves. Therefore, the elemental and group composition of bitumen must also be observed. The use of the viscosity temperature susceptibility (VTS) test appears to be well suited to evaluate the properties of bitumen binders. The VTS parameter is directly dependent on the viscosity of bitumen, but it is necessary to say that VTS can be significantly affected by the composition of the bitumen. The paper is focused on determining the dependencies between the VTS and the bitumen’s composition, respectively, to find out how the composition influences the VTS.

ALTERNATIVE TO A SUPERPAVE SYSTEM IN THE FORMATION OF REGIONAL ROAD RESEARCH INSTITUTIONS

2020 ◽  
pp. 87-96
Author(s):  
С. В. Носов
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Scientific Research ◽  
Road Construction ◽  
Main Task ◽  
Structural Elements ◽  
Regional Research ◽  
Advantages And Disadvantages ◽  
Research Institutes

Постановка задачи. Для решения сложных проблем в области дорожного строительства главной задачей в области научных исследований является на сегодняшний день формирование и развитие региональных дорожных научно-исследовательских институтов или научно-исследовательских дорожных лабораторий. Результаты. Рассмотрены достоинства и недостатки двух методологий на пути повышения качества и долговечности основных конструктивных элементов автомобильных дорог (земляного полотна и дорожных покрытий), учитывающих множество основных и второстепенных факторов. Одна из методологий достаточно хорошо известна и обеспечивает на сегодняшний день требуемый уровень качества асфальтобетона за рубежом в рамках системы Superpave. Вторая методология основывается на реологическом подходе к совершенствованию технологий уплотнения дорожно-строительных материалов и известна дорожникам пока еще мало. Выводы. Установлено, что развитие первой методологии научных исследований у нас в стране весьма затруднительно, а второй - вполне доступно и реально на базе сформированных региональных научно-исследовательских дорожных организаций. При этом концепция их формирования определяет существенные преимущества применения второй методологии. Statement of the problem. To solve complex problems in the field of road construction, the main task in the field of scientific research, which can easily and adequately develop with obtaining real results, is currently the formation and development of regional road research institutes or, in extreme cases, research road laboratories. Results. The advantages and disadvantages of two methodologies for improving the quality and durability of the main structural elements of roads (subgrade and pavement) are considered taking into account many primary and secondary factors. One of the methodologies is quite well known and presently provides the required level of quality of asphalt concrete abroad within the Superpave system. The second methodology is based on a rheological approach to improving the technology of compaction of road-building materials and little is known to road builders. Conclusions. It has been established that the development of the first methodology of scientific research in our country is very difficult, and the second is quite affordable and feasible on the basis of the formed regional research road organizations. Moreover, the concept of their formation determines the significant advantages of using the second methodology.

scholarly journals ALTERNATIVE TO SUPERPAVE SYSTEM IN THE FORMATION OF REGIONAL ROAD R&D INSTITUTE

2021 ◽  
pp. 39-49
Author(s):  
S. V. Nosov
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Scientific Research ◽  
Road Construction ◽  
Main Task ◽  
Structural Elements ◽  
Regional Research ◽  
Advantages And Disadvantages ◽  
Research Institutes

Statement of the problem. In order to solve complex problems in the field of road construction, the main task in the field of scientific research, which can easily and adequately develop with obtaining real results, is today the formation and development of regional road research institutes or, in extreme cases, research roadlaboratories.Results. The advantages and disadvantages of two methodologies on the way to improve the quality and durability of the main structural elements of roads (subgrade and pavement), taking into account many primary and secondary factors, are considered. One of the methodologies is quite well known and provides today the required level of quality of asphalt concrete abroad within the Superpave system. The second methodology is based on a rheological approach to improving the technology of compaction of road-building materials and little is known to road builders. Conclusions. It has been established that the development of the first methodology of scientific research in our country is very difficult, and the second is quite affordable and feasible on the basisof the formed regional research road organizations. Moreover, the concept of their formation determines the significant advantages of using the second methodology.

scholarly journals Quality evaluation and loss estimation at gravel quarries around the Qena Governorate, Egypt: A case study

2021 ◽  
Vol 15 (2) ◽  
pp. 89-94
Author(s):  
Mahrous A.M Ali ◽  
Mohamed M.A Hassan ◽  
Jung-Gyu Kim ◽  
Jong-Gwan Kim
Keyword(s):  
Building Materials ◽  
Quality Evaluation ◽  
Road Construction ◽  
Base Layer ◽  
Physical Chemical ◽  
Application Methods ◽  
Practical Implications ◽  
Representative Samples

Purpose. In recent years in Egypt there has been a significant increase in the demand for building materials, particularly gravel which is employed in buildings, the base layer for road construction, and other industries. The quality of gravel that is deemed suitable for different purposes depends on the physical, chemical, and mechanical properties of the gravel; these aspects are determined according to the Egyptian Code, depending on the required application. Methods. Representative samples were collected from two working sides of the quarries, then they were processed in a laboratory to characterize the samples depending on the location and evaluate their properties with respect to the corresponding concrete and road codes. Findings. The findings indicate that the gravel tests were simple to conduct and that the gravel from these locations were suitable for constructed roads and to be used in mixture of asphalt and cement. Originality. The samples were collected from five quarries around the Qena Governorate, Egypt; each of these locations occupied areas ranging from approximately 100×100 or 200×100 m2. Practical implications. The loss of gravel at the studied quarries was found to be 32.88-44.06%. Abo-Teshet 1 exhibited the highest loss of gravel deposits with thicknesses ranging from 0.5 to 1.50 m, which was attributed to the fill layers.

Why Is Safe Science Good Science?

2018 ◽  
Author(s):  
Camilla Kao ◽  
Che-I Kao ◽  
Russell Furr
Keyword(s):  
Decision Making ◽  
Design Thinking ◽  
Good Science ◽  
Safety Issues ◽  
Safety Requirements ◽  
The Arts ◽  
Hands On ◽  
Obvious Benefit ◽  
New Ideas

In science, safety can seem unfashionable. Satisfying safety requirements can slow the pace of research, make it cumbersome, or cost significant amounts of money. The logic of rules can seem unclear. Compliance can feel like a negative incentive. So besides the obvious benefit that safety keeps one safe, why do some scientists preach "safe science is good science"? Understanding the principles that underlie this maxim might help to create a strong positive incentive to incorporate safety into the pursuit of groundbreaking science.<div><br></div><div>This essay explains how safety can enhance the quality of an experiment and promote innovation in one's research. Being safe induces a researcher to have <b>greater control</b> over an experiment, which reduces the <b>uncertainty</b> that characterizes the experiment. Less uncertainty increases both <b>safety</b> and the <b>quality</b> of the experiment, the latter including <b>statistical quality</b> (reproducibility, sensitivity, etc.) and <b>countless other properties</b> (yield, purity, cost, etc.). Like prototyping in design thinking and working under the constraint of creative limitation in the arts, <b>considering safety issues</b> is a hands-on activity that involves <b>decision-making</b>. Making decisions leads to new ideas, which spawns <b>innovation</b>.</div>

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