This study is part of the Africa Infrastructure Country Diagnostic (AICD), a project designed to expand the world's knowledge of physical infrastructure in Africa. The AICD will provide a baseline ...against which future improvements in infrastructure services can be measured, making it possible to monitor the results achieved from donor support. It should also provide a more solid empirical foundation for prioritizing investments and designing policy reforms in the infrastructure sectors in Africa. The AICD is based on an unprecedented effort to collect detailed economic and technical data on the infrastructure sectors in Africa. The project has produced a series of original reports on public expenditure, spending needs, and sector performance in each of the main infrastructure sectors, including energy, information and communication technologies, irrigation, transport, and water and sanitation. The first phase of the AICD focused on 24 countries that together account for 85 percent of the gross domestic product, population, and infrastructure aid flows of Sub- Saharan Africa. Under a second phase of the project, coverage is expanding to include as many of the additional African countries as possible.
Introduction. This article considers the issue of improving the requirements for the operational condition of public highways and streets (hereinafter referred to as highways) and railway and tram ...crossings based on the analysis of current legal acts, regulatory documents, technical literature, which refers to the objects of standardization, taking into account the requirements for safety and environmental protection at all stages of the road life cycle, in particular operational maintenance. Problem Statement. A significant number of traffic accidents that occurred due to defects in the components of highways require improvement in the organization and conduct of inspections and surveys of highways with the establishment of compliance of a certain number of indicators with regulatory requirements. In addition, the resolution adopted by the UN General Assembly dated 31.08.2020 No. 74/299 «Improving road safety around the world» states that deaths and serious injuries as a result of road traffic accidents can in most cases be prevented on the basis of creating a safer highway infrastructure, which also contributes to the development of regulatory documents that establish modern technical requirements for the operational condition of highways
Introduction. Asphalt mixtures are one of the most widely used materials in road construction. For the production of these mixtures, mainly conditioned mineral materials are used – coarse aggregate, ...fine aggregate and filler, and bitumen is used as a binder. Mineral filer is an important component of the asphalt mixture, which plays a major role in ensuring the quality of asphalt mixtures. The specific surface area of mineral filler is about 90 % of the specific surface area of mineral materials in the asphalt mix. Mineral filler plays two roles in the asphalt mixture: it fills the pores between fine and coarse aggregates and structures the bitumen.
ntroduction. Active integration into the European Union, at the same time as the blockade of seaports and the difference in the standards of the transport sector, especially at border crossing ...points, creates a significant load on the capacity of the transport and logistics system of Ukraine, which, in turn, requires the search and involvement of various tools for strengthening competitiveness of Ukrainian infrastructure and its successful connection with global supply chains. Problem Statement. Transport infrastructure is a key factor of the economy competitiveness. It provides access to markets, resources and services and promotes economic growth and development. However, the challenges of global changes in the field of transport, which determine the need for constant modernization and development of infrastructure, call into question the competitiveness of countries and regions that cannot provide high-quality and efficient infrastructure. The use of the Connecting Europe Facility (CEF) funding tool provides a unique opportunity to improve the national transport infrastructure, ensure its sufficient funding in order to develop cross-border cooperation and increase competitiveness.
Problem Statement. Observation of the performance of objects restored by cold recycling technology shows that more attention should be paid to diagnosing the condition of existing pavement and ...predicting the processes that cause premature deterioration. Purpose. To find solutions to clarify the condition of the existing pavement and to determine in more detail the factors of deterioration. Research methods. Analytical and experimental with the use of computer modeling. Conclusions. Based on the results of the research, an algorithm for conducting the survey was developed, which consists of two consecutive stages. This algorithm is based on the results of the first stage of the survey that provides that not only data are collected, but also envisages that a program for the second stage of the survey is drawn up. Based on the results of the second stage of the survey, a plan diagram of the same type of road sections is formed, the need for additional preparatory work to eliminate local areas with deterioration is determined, and constructive and technological solutions for the repair of pavement using cold recycling technology are developed with the determination of the depth of milling, the amount and composition of stone materials that are additionally added to the mixture, the composition of the binder, etc.
Introduction. DSTU EN 13108-1 establishes requirements for asphalt mixtures used for the arrangement of pavement layers of roads, airfields, etc. These asphalt mixtures are used for arranging the ...base layer, binding layer, and a surface layer. Problem statement. A special feature of DSTU EN 13108-1 is that it establishes general requirements for all indicators, in particular for grading. That is there are no specific requirements for the grading of asphalt mixtures depending on the road category, traffic loading and the location of the asphalt concrete layer in the road pavement structure. Therefore, it is advisable to consider in detail the requirements for the grading of asphalt mixtures, compare them with the requirements of national standards and propose appropriate national requirements. Purpose. Establishment of national requirements for the grading of asphalt mixtures according to DSTU EN 13108-1.
Introduction. As a result of a large-scale armed attack on the sovereign territory of Ukraine and active hostilities, most of the military, civilian and infrastructure facilities have been ...significantly destroyed or damaged. In such circumstances, it is important to have methodological approaches to determining the amount of damage caused by hostilities and further economic assessment of the damage. Problem Statement. Consideration of this topic is the need to clearly define methodological approaches to determining the amount of damage and losses caused to roads as a result of active hostilities. Purpose. To formulate methodological approaches to determining the amount of damage caused by hostilities and further economic assessment of the damage caused. The accuracy and validity of the methodological approach determines the admissibility of the reliability of the calculation and determination of the amount of funds. To accomplish this task, it is necessary to establish definitions of the concepts of "damage" and "losses", since these are different concepts and should be clearly understood by all professionals who will assess the amount of damage.
Introduction. The relevance of the research topic is due to the need to develop measures to ensure the development of construction enterprises (BE), using modern intellectual economic systems. ...Problem Statement. Proposed measures to ensure the development of construction enterprises, which are aimed at the formation and implementation of intelligent economic systems, the creation of a basis for the growth of the completeness and quality of economic support, the use of geo-informational tools, the construction and improvement of the security and information system, the improvement of social security and standards. Purpose. Economic and mathematical modeling of the development of construction enterprises, taking into account the peculiarities of the formation of intelligent economic systems.
Introduction. This article deals with the practice of applying the method of dynamic testing of bridges, namely, modal control using impulse loading. The possibilities of this method for determining ...the technical condition of a bridge span structure by determining its natural characteristics: actual stiffness and parameters of natural vibration forms are shown. Problem Statement. The article is devoted to the problem of practical implementation of the latest theoretical developments in the field of diagnostics of the technical condition of road bridges by conducting full-scale dynamic tests. Purpose. The main purpose of the article is to demonstrate the effectiveness of dynamic impulse testing as a method for assessing the technical condition of bridges. The method involves the excitation of vibrations of bridge structures by means of pulse loads, recording the response of the structure and analyzing the data obtained. Materials and methods. The material for this article is the results of field tests of a curved overpass made of monolithic reinforced concrete located near Kyiv. The following research methods were used: information analysis, mathematical modeling, and general methods of theoretical research.
Introduction. The introduction to the paper highlights the importance of the design and construction of highways of various link functions levels as a key factor in modern integration processes and ...also emphasizes the role of highways for substantial increasing of the road network safety. Problem statement. The issues of the paper concern aspects of highways design based on the experience of European colleagues in the context of the provisions of the relevant legislative acts of EU. Purpose. The goal of the paper is to analyze the main provisions for the design of continental, subcontinental and transregional highways considering, within the format of the publication, the design features of the highways elements which are universal for various design systems. Results. The highways categorization regarding their link functions levels and with this categorization linked classification by design classes were reviewed which accept the highways jurisdiction and the build-up areas related location and also the corresponding restrictions on vehicle speed limits. The highways characteristics were defined allowing the determination of highways as a separate category of motor roads in the world-wide practice of the road building industry.
