Lech Czarnecki

Prof. Lech Czarnecki

Building Research Institute
orcid

Research Focus & Metrics

Academic Career Length

55Years (1972-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 October 2005 in Cement and Concrete Composites
Verified
Journal Article
Closed access
DGDionys Van Gemert
Dionys Van Gemert
Lech CzarneckiLech Czarnecki
Lech Czarnecki
MMMatthias Maultzsch
Matthias Maultzsch
HSHarald Schorn
Harald Schorn
ABAnne Beeldens
Anne Beeldens
EKElke Knapen
Elke Knapen

1 September 1980 in Rubber Chemistry and Technology
Verified
Journal Article
Closed access
JWJames L. White
James L. White
Lech CzarneckiLech Czarnecki
Lech Czarnecki
HTHideho Tanaka
Hideho Tanaka
An experimental study is reported on the rheological properties of compounds of a polystyrene melt with calcium carbonate, carbon black, titanium dioxide, calcium sulfate anhydride fiber, mica, glass beads and aramid, cellulose and glass fibers. Comparison is made of the shear viscosity, elongational viscosity and principal normal stress difference of these compounds at 20 volume per cent loadings. The polymer matrix and compounds with the smallest particle dimension greater than 10µ exhibit low shear rate Newtonian viscosities. Suspensions with particle sizes 0.5µ and smaller exhibit yield values. Yield values are also observed in elongational flow for systems exhibiting yielding in shear flow. The experimental data are contrasted to both mechanistic theories of suspensions with interaction between particles and a phenomenological plastic-viscoelastic tensor constitutive equation.

1 December 2016 in Bulletin Of The Polish Academy Of Sciences-Technical Sciences
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Journal Article
Open access
PDF file
RWR. Wang
R. Wang
JLJ. Li
J. Li
Tongsheng ZhangTongsheng Zhang
Tongsheng Zhang
Lech CzarneckiLech Czarnecki
Lech Czarnecki
Polymers are widely used in cement mortar and concrete modification due to their significant role in improving the overall performance of cement-based materials. Their physical interaction is well-accepted, while less attention is given to chemical interaction between the polymers and cement. Through a review of prior arts, chemical interactions are discussed and summarized in this paper. Various chemical interactions may take place between cement and different types of polymers. Understanding these chemical interactions will play an important role in clarifying the relationship between microstructure and macrostructure of polymer-modified cementitious materials. Authors expressed and proved the conviction that the organic-inorganic (Polymer-Portland cement) composite with some components chemically bonded, in parallel to the physical interaction, will be the next stage in concrete technology progress.

13 October 2020 in Materials
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Journal Article
Open access
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Lech CzarneckiLech Czarnecki
Lech Czarnecki
RGRobert Geryło
Robert Geryło
KKKrzysztof Kuczyński
Krzysztof Kuczyński
The repairs of building structures are inevitable and indispensable. Repairs are used to restore or maintain the usability of existing facilities, often contributing to the extension of their expected service life, increasing the sustainability of building resources. Given that conservation rules are observed, repairs are also used to save monuments. The concept of repair durability brings to the foreground the durability of the repaired structure (after repair): what service life has been obtained/recovered as a result of the repair. Based on the available data (limited set), a generalised distribution function of repair durability was developed, with a disappointing course. This, however, applies (necessarily) to the past. Significant progress was shown to have been achieved in the theoretical and technical fundamentals of technical repair measures. In this situation, a prognostic distribution function was also designed for future repairs according to EN 1504. A rule of thumb called estimating concrete repair durability, CRD was proposed. The risk associated with estimating the durability of repairs was indicated. A reason for optimism is that proactive monitoring of the condition of the structure and, consequently, management of the repair strategy allows to reach the designed life of the structure.

1 April 2006 in Cement and Concrete Composites
Verified
Journal Article
Closed access
Lech CzarneckiLech Czarnecki
Lech Czarnecki
Andrzej GarbaczAndrzej Garbacz
Andrzej Garbacz
MKMikołaj Krystosiak
Mikołaj Krystosiak