CIFICEN   24414
CENTRO DE INVESTIGACIONES EN FISICA E INGENIERIA DEL CENTRO DE LA PROVINCIA DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Durability of concrete containing calcined clays: Comparison of illite and low grade kaolin.
Autor/es:
CORDOBA GISELA PAOLA; RAHHAL, VIVIANA FÁTIMA; TIRONI, ALEJANDRA; ZITO SILVINA VANESSA; IRASSAR, EDGARDO FABIAN
Lugar:
New Dehli
Reunión:
Conferencia; 3rd International Conference on Calcined Clays for Sustainable Concrete, 3º LC3; 2019
Institución organizadora:
Indian Institute of Technology Delhi
Resumen:
In this paper, durability parameters (water sorptivity, water penetration, chloride penetration and natural carbonation) are studied on conventional mixtures (w/cm=0.50). Concretes were elaborated with portland cement (PCC) and blended portland cements, containing 25% replacement by illitic calcined clay (ICC) and low grade kaolinitic calcined clay (KCC). They were characterized by slump, compressive and tensile strengths, and bulk porosity. Water sorptivity (ASTM C 1585) was determined on concretes cured 2, 7 and 28 days; water penetration test (EN 12390) and chloride penetration (ASTM C 1556) were determined on concretes cured 28 days. Carbonation depth undergoing a good and very good curing was assessed using a phenol-phthalein indicator at 3 and 6 months of natural exposition.Results show that water sorptivity is reduced when concrete is curing for 2, 7 and 28 days for all concretes. KCC has a significantly lower sorptivity than PCC and ICC. At 28 days, the water penetration is deeper for ICC and lower for KCC concrete. All concretes have similar apparent chloride diffu-sion coefficients. After six months, the natural carbonation of all concretes is less than 2 mm, with a slightly lower performance of ICC and KCC than PCC.