EFFECTS OF CURING TEMPERATURE ON CHLORIDE MIGRATION AND ELECTRICAL RESISTIVITY OF CONCRETE

Author(s): Utkan ÇorbacÕo÷lu, Egemen Kesler, T. Alper YÕkÕcÕ, YÕlmaz Akkaya
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-171-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 453-462
Total Pages: 10
Language : English

Abstract: Durability and service life of reinforced concrete structures are affected by microstructure and
permeability of concrete. Parameters, including cementitious materials, mixture design and
maturity influence the hydration rate and pore structure of the binder phase, and thus
development of microstructure and permeability of concrete. This study compares the results
obtained by chloride migration and electrical resistivity tests of several concrete mixtures cast
with supplementary cementitious materials, cured under different temperatures. The
correlation between the results of the two test methods were investigated with respect to
development of capillary porosity, calculated based on degree of hydration by Powers model.
Trends observed with concretes, cast with blast furnace slag, fly ash and microsilica, were
further investigated by thin section analysis of the microstructures. Development of the
capillary pore system of the concrete was monitored through thin section microscopy at
different curing temperatures. Capillary porosity of the concrete mixtures was compared with
the light intensity measurements from thin section analysis. It was found that microcracks,
observed in thin section analysis of concrete containing blast furnace slag, affect the chloride
migration and electrical resistivity test results. Test results from construction site were also
obtained and compared with the trends evaluated from laboratory testing. Type of
cementitious materials, curing conditions and testing methods are found to be important
factors in determination of the permeability, due to their effects on maturity and
microstructural development of concrete.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00