Title:
Experimental Investigation on the Effect of Colloidal Nanosilica on Concrete Carbonation
Author(s):
Huang
Publication:
Web Session
Volume:
ws_S23_Huang.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
In this study, the colloidal nanosilica (CNS) was used in the concrete and the carbonation degree was evaluated. It is hypothesized that the incorporation of the CNS can pre-vent the further carbonation of the hardened concrete sample as the pozzolanic reaction of the nanosilica can consume the calcium hydroxide (CH) and improve the durability of the material. A series of tests were designed and conducted. After the initial curing in the moisture room, a curing chamber with high carbon dioxide concentration was used to accelerate the carbonation process. The development of the compressive strength, carbonation degree, and permeability of the concrete sample was tested and monitored. The result of this study shows that the addition of the CNS can effectively prevent the later age carbonation, which could elongate the durability of the concrete structure. Moreover, due to the pozzolanic reaction and the nano-seeding effect of the CNS, high-er mechanical strength and denser cement matrix can be observed. The outcome of this study provides insight into the effectiveness of using CNS in concrete to enhance durability and achieve better strength performance.