Dr hab. inż. Stanisław Klin

Dr inż. Wojciech Kilian

Mgr inż. Robert Świerzko

Mgr inż. Jan Winnicki

Analysis of durability problems of hydrotechnical concrete on example of weirs built since 1975 on the Odra river

The paper comprises analysis of significant problems that determine durability of hydrotechnical concrete in structures and comments on activity of international research teams working on design fundamentals of structures duration. Authors on the basis of the EN 1990 standard have computed the characteristic predicted lifetime of the weir structures on the Odra river. Necessity of changes in design requirements for hydrotechnical concrete has been underlined, attempting to gain considerably more durable structures. On the basis of the analysis an evaluation of durability of concrete structures in weirs built since 1975 on the Odra river has been made. ...

Dr hab. inż. Stanisław Klin

Dr inż. Wojciech Kilian

Mgr inż. Robert Świerzko

Effect of temperature decrease on hydration kinetics of slag cement

The paper presents results of laboratory investigations of temperature change influence on CEM III/A 32,5 NW/NA portland cement paste setting start and end time. Experiments were performed on pastes of water-cement ratio equal 0,25 – 0,29; 0,35; 0,45; 0,55 at temperature equal 0°C, +5°C, +10°C, +20°C. Strong thermosensitivity of the tested cement pastes was clearly found, that was evidenced by increase of both setting start and setting end time. The empirical relations between the cement paste setting time and curing temperature and watercement ratio were established. ...