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„Ochrona przed Korozją” (Corrosion Protection) No 06/2016

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

 

DOI: 10.15199/40.2016.6.1

Influence of the chloride content in blast furnace slag cement on protective ability of concrete cover for reinforcement

KUZIAK J.

WOYCIECHOWSKI P.

Politechnika Warszawska, Zakład Inżynierii Materiałów Budowlanych

WCISŁO A.

The investigation of the effect of chloride content in blast furnace slag cement on the protective properties of concrete cover of steel was carried out. Cement containing from 0.085 to 0.5% chloride ion was used. The protective properties of the concreto cover were evaluated based on anodic polarization curves of steel in the concrete after different periods of concrete hardening and carbonation. No effect of chloride content in the cement, over a range of tested values, on the corrosion of steel reinforcement was found. Noncarbonated cover, even at the highest chloride content used, showed a good protection properties for reinforcement. The active corrosion of steel reinforcement in the carbonated concrete was observed.

Keywords: blast furnace slag cement, chlorides, polarization curve, corrosion of steel in concrete

2016

Vol. 59, nr 6

s. 196-199

Ref. 8

 


 

DOI: 10.15199/40.2016.6.2

The influence of salting sandstone on the development of mould

STANASZEK-TOMAL E.

STRYSZEWSKA T

PK Cracow University of Technology, Faculty of Civil Engineering Chair

of Building Materials Technology and Structure Protection

This paper describes the effects of the combined action of two aggressive environments. The effect of sulphate or chloride ion content on the growth of microorganisms and possible effect of chemical and biological corrosion on the properties of stone material (sandstone). The research results made it possible to formulate a number of statements: sandstone is not resistant to contamination by sulphate or chloride ions. Chemical contamination enhances the action of the microbial environment.

Keywords: sandstone, sulfate ions, chloride ions, moulds, absorbability of water, COD

2016

Vol. 59, nr 6

s. 200-205

Ref. 20

 


 

 DOI: 10.15199/40.2016.6.3

Influence of exposure in water on reduction of compressive strength of brick with fly ash addition

STRYSZEWSKA T.

Politechnika Krakowska, Katedra Technologii Materiałów Budowlanych i Ochrony Budowli

KAŃKA S.

Politechnika Krakowska, Laboratorium Badawcze Materiałów i Konstrukcji Budowlanych

The article presents the results of research concerning an impact of water on compressive strength of brick. The study was carried out on brick produced today in one of the Polish brickyard. A brick is characterized by a high content of fly ash added to the ceramic mass. Tests showed that mechanical properties of the bricks in the water saturation state were worse than in the dry state. This phenomena was connected with degradation of silicon-oxygen network – breaking of silicon-oxygen bridges Si-O-Si and dissolved process some components of textures.

Keywords: brick with fly ash, influence of water, compressive strength

2016

Vol. 59, nr 6

s. 206-209

Ref. 6

 


 

DOI: 10.15199/40.2016.6.4

A simple method of limiting polarization range during measurements of corrosion rate of reinforcement in concrete

JAŚNIOK T.

JAŚNIOK M.

Politechnika Śląska, Katedra Konstrukcji Budowlanych

This paper describes the original method of limiting polarization current distribution during the measurements of corrosion rate of reinforcement in concrete. On the basis of assumptions behind this method, the polarization range can be limited by cutting through the concrete cover thickness providing that the cut diameter corresponds to the diameter of a disk electrode in a measuring head. The ring-shaped cut is filled with an insulator which simultaneously fixes locally damaged concrete. Electrochemical measurements by LPR and EIS techniques were used to verify the assumptions of the proposed method in the solution simulating concrete pore solution. A working electrode was a smooth steel bar, and counter electrodes were made of circular metal plate and rectangular wire mesh. A fragment of the plastic pipe simulated the ring-shaped dielectric in the pore solution. In the summary, the approximate electrical model explains the analysed phenomenon.

Keywords: concrete structures, pore solution, reinforcing steel, polarization resistance, impedance spectroscopy

2016

Vol. 59, nr 6

s. 210-213

Ref. 9

 


 

DOI: 10.15199/40.2016.6.5

Impact of waste mineral powders on chemical resistance of polymer-cement composites

JAWORSKA B.

ŁUKOWSKI P.

Department of Building Materials Engineering, Warsaw University of Technology

JAWORSKI J.

Institute of Building Engineering, Warsaw University of Technology

The paper presents the results of research of the impact of waste mineral powders on the chemical resistance of polymer-cement composites. The study was conducted using specimens of polymer-cement composites modified with siliceous and calcareous fly ash and waste perlite powder. Chemical resistance of modified composites was determined by the water absorption of specimens after exposure in sulfuric acid (H2SO4) and sodium hydroxide (NaOH) solutions.

Keywords: polymer-cement composites PCC, siliceous fly ash, calcareous fly ash, waste perlite powder

2016

Vol. 59, nr 6

s. 214-217

Ref. 14

 


 

DOI: 10.15199/40.2016.6.6

Workmanship faults during repair of concrete water tanks influencing their durability

HALICKA A.

SZERAFIN J.

Lublin University of Technology, Chair of Building Structures

This article is a ‘case study’ of two cylindrical water tanks covered by pre-cast concrete slabs supported by pre-stressed beams. During the repair works, sufficient care was not extended – this refers to the sequence of works, assessment of structure conditio as well as quality of the new cover slabs. In the expert opinions prepared after the repair, it was stated that these faults may result in reduced durability, and ’repair of the repairs’ was recommended. The aim of this article is to show that the repairs of structures subjected to corrosive agents require extension of utmost care.

Keywords: durability, repair, water tanks, pre-stressed beams, concrete cover of reinforcement

2016

Vol. 59, nr 6

s. 218-221

Ref. 5