CHLORIDE DIFFUSION RESISTANCE OF LIMESTONE CALCINED CLAY CEMENT (LC3) CONCRETE BASED ON CALCINED CLAY REACTIVITY

Publication Type:
Conference Proceeding
Citation:
fib Symposium, 2022, pp. 233-239
Issue Date:
2022-01-01
Full metadata record
This study investigated the chloride diffusion resistance of limestone calcined clay cement (LC3) concrete depending on the calcined clay reactivity. Two calcined clays with different reactivity were used to fabricate LC3 concretes. The replacement rate of calcined clay and limestone in binder was adjusted based on the reactivity in order to achieve similar compressive strength after 28 days of curing. The chloride diffusion resistance of LC3 concretes was evaluated using the bulk diffusion test protocol according to NT BUILD 443 (or ASTM C1556). Both LC3 concretes outperformed the reference general purpose cement concrete with significantly lower chloride diffusion coefficients. The chloride diffusion coefficients of the two LC3 concretes were similar despite the different replacement rates of calcined clay and limestone due to different calcined clay’s reactivity. This result indicates that LC3 concrete chloride diffusion resistance is only marginally dependent on the type of calcined clay used if similar compressive strength can be obtained within the LC3 concretes by using an optimum replacement rate.
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