Title:
Investigation of the Effect of the Nanosilica (CNS) on the New-and-Old Portland Cement Concrete Interface
Author(s):
Cihang Huang
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/23/2022
Abstract:
The bonding between new-and-old concrete greatly affects the quality of the concrete pouring and patching. This study was performed to investigate the advantage of using colloidal nanosilica (CNS) in Portland cement concrete by studying the quality of the interface between the new-and-old concrete. It is hypothesized that the seeding and filling effect of the nanoparticles favors the densification of the cement matrix, while the improved curing quality caused by the CNS may also contribute to the formation of stronger bonding between concrete layers. Mercury intrusion porosimetry (MIP) and image analysis were carried out to study the interface of the prepared concrete layers. The experimental result indicates that the density of the interface region was increased with the incorporation of the CNS, which suggests an improvement in the bonding quality. More-over, the image analysis indicates that the incorporation of the CNS may improve the durability of the concrete by refining the voids in the cement matrix. In addition, it was found that an increased strength to density ratio was achieved by using CNS, which suggests that a lower amount of the cement can be used to reach the same targeted strength requirement.