Erratum on the article ‘A feasibility study of using composite reinforcement in transport and power industry structures’ (doi:10.3846/16484142.2017.1342689)

"Erratum on the article ‘A feasibility study of using composite reinforcement in transport and power industry structures’ (doi:10.3846/16484142.2017.1342689)." Transport, 32(4), p. 43

A feasibility study of using composite reinforcement in transport and power industry structures

About 92% of Lithuanian bridges are made of reinforced concrete. Therefore, the problem of increasing the reliability and service life of their structures is most important for ensuring effective operation of transport buildings. The main factor causing transport building structures’ failure is associated with high water permeability and low resistance to attack by corrosive media of concrete used in construction. Ports, bridges, tunnels, viaducts make a group of transport structures strongly attacked by the aggressive media, e.g. cold air, water, ice, salts, etc. Though the members of these structures (e.g. columns, beams) are usually designed for 50 years of service, they often require a major overhaul or strengthening, when less than the half of this period has passed. Most of the damaged structures are the destroyed protective concrete layer and the corroded steel reinforcement. The corrosion of steel reinforcement is the main problem, causing the decrease of strength in the structures’ and their brittle failure. Now, composite reinforcement is the alternative material used for reinforcing in the considered structures. Its mechanical properties, including the tensile strength and resistance to the attack of aggressive media, are similar to or even better than those of commonly used steel reinforcement. The experimental data on using composite reinforcement in the compression members or in the compressed zones of flexural members of the structures are lacking. Therefore, most of design codes do not mention or even do not recommend using composite reinforcement in these cases. The paper presents the analysis of the possibilities of using composite reinforcement in transport and power industry structures

Assessment of the reliability of the reinforced concrete layer in structures

An urgency to use probability-based methods and probabilistic reliability indices in long-term quality assessments and predictions of reinforced concrete products and structures is under consideration. Carbonation nature and depth of protective concrete covers of reinforcement bars and stirrups are analysed. Effect of water-cement ratio on the carbonation rate of protective concrete covers is discussed. Analyzes of reliability of structures reinforcement with composite as spiral (transverse) usage and influence. Presented applied equations and the calculation example demonstrate a simplicity and necessities of probability-based methods. Article in Lithuanian. Kompozitine armatūra armuotų konstrukcijų apsauginio betono sluoksnio patikimumo vertinimas Santrauka Svarstoma galimybė taikyti tikimybe pagrįstus metodus bei tikimybinius patikimumo rodiklius gelžbetoninių gaminių ir konstrukcijų ilgaamžiškumui bei patikimumui vertinti. Tikimybiniais metodais analizuojamas gelžbetoninių konstrukcijų apsauginio betoninio sluoksnio patikimumas. Analizuojamas vandens ir cemento santykio betono mišinyje bei kitų veiksnių poveikis apsauginių betono dangų karbonizacijos greičiui. Aptariamas kompozitinės kaip skersinės armatūros naudojimas konstrukcijoms armuoti bei jos įtaka konstrukcijų patikimumui ir ilgaamžiškumui. Pateiktas taikomojo skaičiavimo pavyzdys rodo tikimybinių metodų paprastumą ir būtinybę. Reikšminiai žodžiai: karbonizacija, betoninis apsauginis sluoksnis, patikimumas, kompozitinė armatūra