Investigation of the Foamed Concrete Properties Containing Nanosilica, as Compared with the Foamed Concrete Containing Microsilica

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Title: Investigation of the Foamed Concrete Properties Containing Nanosilica, as Compared with the Foamed Concrete Containing Microsilica

Author(s): Alireza Fiouz and Sina Saadat

Publication: Special Publication

Volume: 289

Issue:

Appears on pages(s): 1-13

Keywords: foamed concrete, Nano silica, micro silica, compressive strength, SEM images, Micro structure

Date: 9/14/2012

Abstract:
This paper investigates the properties of the foamed concrete containing Nano silica, as compared with the foamed concrete containing micro silica, as well as comparing the properties of these two concretes with the concrete witness concrete. To conduct this study, Nano silica with an average size of 12nm and 1 to 6% of the cement weight was used; in addition, micro silica with an average size of 230nm and 1 to 6% of the cement weight was utilized. In this study the size of the air-voids in the hardened concrete ranged from 0.1 to 1 mm. The air voids were due to the protein- based foaming agent. The Type 1 cement used in this project was based upon ASTM C 150 .The samples were produced in two forms, that is, with and without sand. The compressive strength test was conducted for the samples at the ages of 7 and 28 with an approximately dried density of 600 and 1600 kg/m3.The SEM images were obtained from the failure section. The results indicated that in initial days, samples containing Nano silica have greater compressive strength than those containing micro silica and also the no-sand samples containing Nano silica show a greater increase in the amount of compressive strength than those containing micro silica and witness samples. The micro structural examination of the foamed concrete by using the SEM images suggests the improvement in the concrete micro structure and mechanical properties containing Nano silica.