Performance of Limestone Calcined Clay Cement (LC3) with various kaolinite contents with respect to chloride transport

The durability of mortar and paste mixtures with respect to chloride ion ingress was investigated for binary blends of Portland Cement Calcined Clay, and ternary systems of Limestone Calcined Clay Cement (LC 3 ). Five clays from various sources with different kaolinite content (17–95%) were studied....

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Bibliographic Details
Published inMaterials and structures Vol. 51; no. 5; pp. 1 - 17
Main Authors Maraghechi, Hamed, Avet, Francois, Wong, Hong, Kamyab, Hadi, Scrivener, Karen
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.10.2018
Springer Nature B.V
Subjects
50 years of Materials and Structures
Binding
Building construction
Building Materials
Cement
Chloride
Chloride ions
Chloride resistance
Civil Engineering
Clay
Diffusivity
Durability
Engineering
Kaolinite
Limestone
Machines
Manufacturing
Materials Science
Mortars (material)
Porosity
Portland cements
Processes
Roasting
Solid Mechanics
Ternary systems
Theoretical and Applied Mechanics
Limestone
Phase assemblage
Calcined clay
Supplementary cementitious materials
Kaolinite
Chloride diffusion
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Summary:The durability of mortar and paste mixtures with respect to chloride ion ingress was investigated for binary blends of Portland Cement Calcined Clay, and ternary systems of Limestone Calcined Clay Cement (LC 3 ). Five clays from various sources with different kaolinite content (17–95%) were studied. The main factor controlling the diffusivity of LC 3 systems was found to be the kaolinite content of the clay. Resistance to chloride ingress increased to intermediate levels of kaolinite content and then stabilized. An intermediate kaolinite content of around 50% resulted in two orders of magnitude reduction in diffusivity compared to PC, indicating that the use of high grade (expensive) clays is not necessary to obtain good durability. The chloride binding capacity and distribution of bound chloride between Friedel’s salt and C–A–S–H were quantified for the different systems at fixed water to binder ratio of 0.5. The chloride binding capacity appeared to be a minor factor compared to the porosity refinement in the improved durability of LC 3 systems.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-018-1255-3