High-Volume Fly Ash Concrete with and without Hydrated Lime: Chloride Diffusion Coefficient from Accelerated Test

• Published in: Journal of materials in civil engineering Vol. 25; no. 3; pp. 411 - 418
• Main Authors: Filho, J. Hoppe, Medeiros, M. H. F, Pereira, E, Helene, P, Isaia, G. C
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01-03-2013
• Subjects: Applied sciences; Buildings. Public works; Cements; Chlorides; Concretes; Concretes. Mortars. Grouts; Durability; Electric potential; Exact sciences and technology; Fly ash; General (composition, classification, performance, standards, patents, etc.); Lime; Materials; Slaked lime; Technical Papers; Hydration; Hydrated lime; Porosimetry; Migration; Construction materials; Concrete mix design; Compressive strength; Experimental study; X ray diffraction; Accelerated test; Fly ash; Lime; Chloride; Chlorides; Ion scattering; Chloride diffusion; Electric resistivity; Concrete; Diffusion coefficient
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000596

AbstractFly ash changes the microstructure of paste and can increase concrete durability. Calcium hydrated lime was added to concrete with 50% of the cement, by weight, substituted with fly ash, with the intent of replacing some of the calcium hydroxide consumed by the pozzolanic activity. Three proportions of mixes were studied: concrete with high early strength cement (HESC), concrete with 50% HESC and 50% fly ash, and concrete with 50% HESC, 50% fly ash and an additional 20% of hydrated lime. They were then tested according to ASTM C1202, but with the application of a voltage of 30 V during 35 h. Results revealed that concretes containing fly ash and hydrated lime presented a lower accumulated charge density and coefficient of chloride diffusion than the HESC concrete used as a reference.