Award Date

8-1-2014

Degree Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Civil and Environmental Engineering

First Committee Member

Nadar Ghafoori

Second Committee Member

Mohamed Kaseko

Third Committee Member

Samaan Ladkany

Fourth Committee Member

Spencer Steinberg

Fifth Committee Member

Samir Moujaes

Number of Pages

207

Abstract

In this research study, transport properties of various self-consolidating concretes (SCCs) containing nano-particles (SiO2) were investigated. Nano-silica replaced a portion of the cementitious materials at different replacement levels ranging from 1.5 to 7.5% by weight. For the purpose of this investigation, flow, bulk, and transport properties of SCCs were studied. The investigated transport properties were absorption, water penetration, rapid chloride permeability, capillary absorption, rapid migration, and chloride diffusion. Transport properties of nano-silica SCCs were also compared to those of equivalent silica fume (micro silica) contained concretes, as well as those of control mixture (concrete without nano or micro silica).

Test results showed that all transport properties of SCCs improved with inclusion of nano-silica. Improvement in transport properties increased with increases of nano-silica replacing a portion of cementitious materials, as well as extension of curing age. A comparison of transport properties between nano-silica contained SCCs and their equivalent silica fume (micro silica) contained SCCs revealed a slightly better performance for concretes containing silica fume at both studied curing ages. This finding was primarily attributed to agglomeration of nano-silica particles during mixing process.

Keywords

Concrete; Nano-Silica; Nanostructured materials; SCC; Self-consolidating concrete; Self-consolidating concrete – Properties; Silica; Silica Fume; Transport Properties

Disciplines

Civil Engineering | Environmental Engineering | Materials Science and Engineering | Nanoscience and Nanotechnology

Language

English