Use of a natural pozzolan for improving concrete properties

Title: Use of a natural pozzolan for improving concrete properties
Author(s): O. Sengul and A. Turkoglu
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 765 - 771
Total Pages: 7
Nb references: 4
Language: English

Abstract: In recent years, more optimized, high-performance Portland cements and combinations of Portland cements with pozzolanic materials have been used for concrete structures in severe chloride containing environment. In recent years, it was also shown that the filler effect is more important than its pozzolanic effect. Thus, the fineness of the pozzolan is very important for the modification of aggregate-cement interface zone in high performance concretes. To provide more information about a natural pozzolan on the resistance of concrete against chloride penetration, an experimental program was carried out, where pure Portland cement was partially replaced by the natural pozzolan at various amounts. To increase the filler effect, thus, obtain better concrete properties, the pozzolan was ground to two different finenesses. To compare the effectiveness of this pozzolan, mixtures with a finely ground blast furnace slag was also prepared. In the experimental study, strength of the mixtures were obtained at different ages. The resistances of the concretes against chloride penetration were determined using different methods. The rapid chloride penetration test according to ASTM C1202, an immersion test and a wetting-drying test using a chloride solution were performed. Electrical resistivities of the mixtures were also recorded. The results obtained were used as input parameters in a multi-objective optimization method where the strength of concretes were maximized but rapid chloride permeability and cost were minimized.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00