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„Ochrona przed Korozją” (Corrosion Protection) No 01/2017

View cover and table of contents (in Polish and English) (pdf)

 

DOI: 10.15199/40.2017.1.1

Application of damage mechanics rules to evaluate the growth of corrosive deformations in transition layer

WIECZOREK B.

Institute of Electrical Engineering and Computer Science Silesian University of Technology

KRYKOWSKI T.

Department of Mechanics and Bridges Silesian University of Technology

In analysis of degradation of the reinforced concrete structures as a result of reinforcement corrosion, it is very important to characterize the cracking of concrete cover from the initiation of the reinforcement corrosion process to the mechanical damage of concrete cover. The methods of analysis of the problem found in literature are difficult to be applied in the algorithms which use finite element method (FEM). Published techniques require also adopting a number of assumptions about the material structure and experimental verification of these assumptions is very complicated. This paper presents a method for describing transformations which applies concept of degradation parameter similar to the one used in damage mechanics. Proposed method is easy to describe and to apply in calculations using FEM. It requires also a small numer of material parameters.

Keywords: corrosion, FEM, degradation, cracking of concrete cover

2017

Vol. 60, nr 1

s. 3-6

Ref. 7


DOI: 10.15199/40.2017.1.2

The influence of polymer additives on shrinkage of cement composites

LENART M.

GRUSZCZYŃSKI M.

Politechnika Krakowska

PASZEK U.

Instytut Badawczy Dróg i Mostów, Warszawa

Characteristic mortars and concretes is their shrinkage related with chemical changes occurring as a result of hydration of the cement as well as water evaporation from the surface of elements. Shrinkage is undesirable, because on the one hand creates technological problems and, on the other hand, causes problems with durability, for example, by cracking of the surface as result of negligent care of fresh concrete. All these factors causes that the occurrence of shrinkage and attempts to reduce it are of interest to researchers. The article presents the impact of different types of polymers on the shrinkage of mortars. The following additives were tested: styrene-acrylic copolymer (SA), styrene-butadiene rubber (SBR), polyvinyl alcohol (PVA) and the standard shrinkage reducing additive based on polypropylene glycol (SRA).

Keywords: shrinkage, polymer, polymer cement concrete, additives to reduce shrinkage

2017

Vol. 60, nr 1

s. 7-9

Ref. 18


DOI: 10.15199/40.2017.1.3

Sulfate corrosion of concrete designed to wastewater settlers after wet flue gas desulfurization (WFGD) installation. Part I – The state of knowledge

SŁOMKA-SŁUPIK B.

Wydział Budownictwa, Politechnika Śląska, Gliwice

MENTELSKI S.

The problem of sulfate corrosion of concrete, on the example of one of the Silesian power plant with the installation of wet flue gas desulfurization (WFGD) with a wastewater treatment junction is discussed. The attention is focused on settling tanks, which are collecting wastewater with high content of SO42- ions.

Keywords: concrete, WFGD sewage, sulfur, corrosion

2017

Vol. 60, nr 1

s. 10-12

Ref. 35


DOI: 10.15199/40.2017.1.3

People I met

BONORA P.-L.