<abstract xmlns="http://www.w3.org/1999/xhtml">When you say about a thing or a being that they are robust, you imagine a complete entity from the point of view of its component parts giving out force and safety. The notion of robustness is associated with a lot of activity domains. Consequently, there are many definitions individualizing the robustness notion depending on the study domain.The work aims to join in the present day studies with a new research in the bridge domain. The object of the study is represented by three low track steel lattice girder railway bridges.In the article there is also presented the way the structural robustness notion is to be found in the national codes.</abstract>

Checking the low track lattice girder bridges for robustness

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper examines the need for a Public Procurement Maturity Model (PPMM) in organizations with the role of road infrastructure buyers under public procurement legislation in a monopsony market structure. The environment used to contextualize the information is Romania and CNADNR (Compania Națională de Autostrăzi și Drumuri Naționale din România).The literature research, open data as well as my own practical experience are used as entry data for the four parts of the paper: (i) the context leading to the PPMM need identification, (ii) an overview of the existing public (procurement) maturity models; (iii) discussions and (iv) summary, limitations, and outlook.The paper provides arguments of an upstream intervention in the value chain of road transport infrastructure and highlights the benefits of such an intervention. Elements such as Romanian cultural dimensions, type of market structure or impact of the outcomes of public procurement process for road infrastructure are considered relevant entry data for an intervention which aims to contribute to the improvement of performance at a procurement process level.The results of this paper serve as a starting point for further reflection on the performance in road infrastructure public procurement area in Romania. In addition to the awareness of the need for an intervention at a contracting authority level, the paper arguments that market structure or national cultural dimensions must be considered as entry data in designing maturity models.</abstract>

Examining the need for a public procurement maturity model (PPMM) for infrastructure buyers in a monopsony market structure

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper aims to establish the interface conditions influence on the flexible pavement structures life. The methodology consists in using the interface constitutive model available in the Alizé calculation program to calculate the stresses and strains in the flexible pavement structures.The design criteria related to limiting fatigue cracking of asphalt layers and permanent deformations at the subgrade level from the road bed are used to estimate the flexible pavement structures lifetime.When calculating the critical stresses and strains, most mechanical design methods of the flexible pavement structures considers that the road layers at interfaces are perfect bonded or total unbonded.Proper modeling of the interface binding condition is an important aspect in understanding the real behaviour of in-service flexible pavement structures.</abstract>

Technical University of Civil Engineering Bucharest, Department of Roads, Railways and Construction Materials

Influence of the interface conditions on flexible pavement structures life

<abstract xmlns="http://www.w3.org/1999/xhtml">Very often, pavements constructed in an economical manner or matching surface elevations of adjacent lanes cannot be designed for the soil conditions of the existing subgrade. Therefore, there is a need to stabilize the soil with an appropriate chemical substance in order to increase its strength to a satisfactory level. For the enhancement of subgrade soil strength characteristics, lime and cement are the most commonly used stabilizers. An experimental program was directed to the evaluation of a clayey soil and its mixtures with different cement contents performing tests on the index properties, the moisture-density relation, the unconfined compressive strength, and linear shrinkage. There is a definite improvement in strength. The time interval used to cure the prepared specimens affected positively both strength and plasticity features of the mixtures. A comparison with mixtures of the same soil with lime has been made, because of the wide use of lime in clay soil stabilization projects.</abstract>

The role of curing period on the engineering characteristics of a cement-stabilized soil

<abstract xmlns="http://www.w3.org/1999/xhtml">More than 1,24 million people die each year on the worlds roads and between 20 to 50 million suffer from nonfatal injuries. The UN Road Safety Collaboration Meetings under the leadership of WHO developed the Programme for the Decade of Actions for road safety taking nations into the responsibility of improving their accident figures by the five pillars of a national Road Safety Policy, safer Roads, safer Vehicles, safer Road Users and Post Crash Care. It is this Safe System Approach that takes into consideration the land use, infrastructure and transport planning, road user’s abilities and limitations and the close cooperation of all governmental and none governmental stakeholders involved.Following the European Transport Safety Council's (ETSC) 8th Road Safety Performance Index Report on Ranking EU Progress on Road Safety; June 2014 Romania has made progress during the last 10 year but had still the highest fatality rate of 93 fatalities per 1 million inhabitants in Europe. [1]The contribution will present the main activities of the fife pillars with a focus on PIARC's Road Infrastructure Management tools to improve safety and function of the road infrastructure based on the experiences with the land use problems in Asian, African and European countries.A GPS based accident data system will help researchers and practitioners to improve their countries road safety.The report will show the important steps for safer roads which had been developed in Romania and how actions of short and long term measures on all five pillars have reduced the number of traffic victims remarkable in Eastern Germany after reunification and in addition how the hierarchy of motorways, 2+1 express roads, the rural roads and traffic calming in built up areas, have improved the economic development of cities and villages in a safe way.</abstract>

The safe road transport system approach

<abstract xmlns="http://www.w3.org/1999/xhtml">A discussion of the dominant factors affecting the behaviour of long span cable supported bridges is the subject of this paper. The main issue is the evolution of properties and response of the bridge with the size of the structure, represented by the critical parameter of span length, showing how this affects the conceptual design. After a review of the present state of the art, perspectives for future developments are discussed.</abstract>

Concepts and new perspectives for long span bridges

AHEAD OF PRINT

Volume 12 (2023): Issue 2 (December 2023)

Volume 12 (2023): Issue 1 (July 2023)

Volume 11 (2022): Issue 2 (December 2022)

Volume 11 (2022): Issue 1 (July 2022)

Volume 10 (2021): Issue 2 (December 2021)

Volume 10 (2021): Issue 1 (July 2021)

Volume 9 (2020): Issue 2 (December 2020)

Volume 9 (2020): Issue 1 (July 2020)

Volume 8 (2019): Issue 2 (December 2019)

Volume 8 (2019): Issue 1 (July 2019)

Volume 7 (2018): Issue 2 (December 2018)

Volume 7 (2018): Issue 1 (July 2018)

Volume 6 (2017): Issue 2 (December 2017)

Volume 6 (2017): Issue 1 (July 2017)

Volume 5 (2016): Issue 2 (December 2016)

Volume 5 (2016): Issue 1 (July 2016)

Volume 4 (2015): Issue 2 (December 2015)

Volume 4 (2015): Issue 1 (July 2015)

Volume 3 (2014): Issue 2 (December 2014)

Volume 3 (2014): Issue 1 (July 2014)

Volume 2 (2013): Issue 2 (December 2013)

Volume 2 (2013): Issue 1 (July 2013)

Volume 1 (2012): Issue 1 (December 2012)

Romanian Journal of Transport Infrastructure

Through its appearance (twice per year) magazine aims to be a high-quality scientific source of information for researchers, academics, engineers, practitioners, policy – makers, PhDs, students and anyone interested in various issues related to transport infrastructure: roads, bridges, railways and geotechnics.  The aim of the journal is to reflect the results of fundamental and applied research at a high level, maintained through a rigorous peer review performed by specialists, well known in the field, both at national and international level.  Romanian Journal of Transport Infrastructure (RJTI) involves the design, manufacture and maintenance of all categories of roads, airports, bridges, railways, tunnels and all types of transportation mean. The journal deals also with the materials and technologies in transport infrastructure and transportation engineering.  Welcome to receive original research papers involving latest discoveries and improvements in this area.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 