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2. Carbonation Resistance Classes of Concretes

Author

Moraru Cristinel, Apostu Adelina, and Georgescu Dan

Subjects
carbonation, concrete, cement, durability, Transportation engineering, TA1001-1280
Abstract

Concrete carbonation is a phenomenon that occurs by the penetration into the cement stone of CO2 present in the atmosphere. The phenomenon occurs in the presence of water in which CO2 dissolves, forming carbonate ions, which in turn react with calcium ions in the pores of the concrete, resulting in calcium carbonate (calcite). The diffusion of CO2 occurs through pores and surface defects, it thus penetrates deeper into the concrete and the carbonation reaction can occur at a greater depth, eventually exceeding the thickness of the cover, causing corrosion of the reinforcement. [1]

Published
2021
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3. Freeze/Thaw Resistance Classes of Concretes

Author

Apostu Adelina, Georgescu Dan, and Cristinel Moraru

Subjects
cement, Transportation engineering, TA1001-1280, Chemistry, freeze/thaw, concrete, durability, Freeze thaw resistance, General Medicine, Composite material
Abstract

The freeze/thaw phenomenon is of interest for the field of transport infrastructure through the degradations it produces in the structure of construction elements. The climatic specificity of Romania on the one hand and the exposure to aggressive environments of construction elements in transport on the other hand, determine the importance of studying this phenomenon, its mode of action/propagation and also prevention and maintenance to ensure the functionality of buildings in transport infrastructure. Currently, in the Romanian regulations [*], the assurance of sustainability is done, as in most national annexes for the application of EN 206 [1] in Europe, by a descriptive approach (concrete “designed to last”) referring to (with mandatory status) a series of requirements of the concrete composition (water / cement ratio, minimum cement dosage, entrained air, freeze/thaw resistant aggregates, etc.) and to the compressive strength (concrete compressive strength class) in depending on the classification of the element in a certain exposure class “X”. The support of this descriptive national approach was based on the analysis of a large number of results obtained in a complex experimental program carried out by Technical University of Civil Engineering Bucharest, by analyzing the results obtained by laboratory tests on “candidate” cements and cements “reference” (having a good behavior and traditional use) as well as “in situ” tests/determinations on construction elements made with both categories of cements and maintained in specific environments. At European level, performance approaches to sustainability have made clear progress. The development of accelerated laboratory experimental methods, the establishment of performance criteria, classes of resistance to various environmental actions and the link between them and the classes of exposure to various environmental actions were the starting point for experimental research whose results will be presented in this article. Thus, in conjunction with these modern approaches, an analysis will be presented on the experimental results obtained in research on freeze/thaw resistance to different types of cements, carried out in collaboration with the laboratory of the Reinforced Concrete Structures Department, Technical University of Civil Engineering Bucharest and proposals for classification in different classes of freeze/thaw resistance.

Published
2020

8. APLICAREA UNOR METODE DE EVALUARE ASOCIATE PERFORMAŢELOR MATERIALELOR PENTRU STABILIREA DOMENIILOR DE UTILIZARE A BETONULUI.

Author

GEORGESCU, DAN PAUL, RECE, LAURENŢIU, IONESCU, ANCA, and APOSTU, ADELINA

Subjects
CONCRETE construction, REINFORCED concrete, COMPRESSIVE strength, CARBONATION (Chemistry), CONSTRUCTION materials
Abstract

Copyright of Romanian Journal of Materials / Revista Romana de Materiale is the property of Foundation for Materials Science & Engineering Serban Solacolu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2019

10. METHODOLOGY FOR THE ASSESSMENT OF CONCRETE STRENGTH CHARACTERISTICS BASED ON THE ANALYSIS OF THE CRITICAL POINTS GENERATED BY CONCEALED WORKS.

Author

Georgescu, Dan, Rece, Laurenţiu, Pironea, Bianca, and Apostu, Adelina

Subjects
CONCRETE analysis, MECHANICAL behavior of materials, CONCRETE construction, QUALITY control, CASTING (Manufacturing process), COMPACTING
Abstract

Copyright of Romanian Journal of Materials / Revista Romana de Materiale is the property of Foundation for Materials Science & Engineering Serban Solacolu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2018

11. APPLICATION OF THE METHODS BASED ON THE PERFORMANCE OF DURABILITY FOR ESTABLISHING THE DOMAINS OF USING THE CONCRETES PRODUCED WITH COMPONENT MATERIALS FROM REPUBLIC OF MOLDOVA.

Author

GEORGESCU, DAN, APOSTU, ADELINA, and CROITORU, GHEORGHE

Subjects
CONCRETE durability, MINERAL aggregates, COMPRESSION loads, STRENGTH of materials, SCALING (Concrete)
Abstract

Copyright of Romanian Journal of Materials / Revista Romana de Materiale is the property of Foundation for Materials Science & Engineering Serban Solacolu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2017

12. THE APPLICATION OF THE EQUIVALENT DURABILITY PROCEDURE TO EXISTING BUILDINGS.

Author

GEORGESCU, DAN and APOSTU, ADELINA

Subjects
CONCRETE durability, MECHANICAL properties of condensed matter, ANELASTICITY, BRITTLENESS, ELASTIC hysteresis
Abstract

Copyright of Romanian Journal of Materials / Revista Romana de Materiale is the property of Foundation for Materials Science & Engineering Serban Solacolu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2016

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