Work

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

Year: 2018

Type: article

Abstract: 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.

Source: Materials and Structures

DOI: 10.1617/s11527-018-1255-3

Authors: Hamed Maraghechi, Francois Avet, Hong Wong, Hadi Kamyab, Karen Scrivener

Institutions: École Polytechnique Fédérale de Lausanne, Imperial College London, Flemish Institute for Technological Research

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,390

Funder: Direktion für Entwicklung und Zusammenarbeit