Studies of the Neutralization Depth Prediction for Concrete in Taiwan
Date Issued
2015
Date
2015
Author(s)
Wei, Shih-Hsiang
Abstract
Carbonation of concrete is the major time-limiting factor for the durability of reinforced concrete structures. The carbonation reaction between atmospheric CO2 and Ca(OH)2 of the concrete mass destroys the high pH environment of surrounding concrete which protects the steel bars of reinforced concrete from corrosion. Most of the concrete neutralization depth prediction and assessment methods are based on theoretical models or empirical formulas. There are several parameters affecting the relationship between neutralization depth and time in those predicting formulas, and these parameters depend on local conditions. Thus, to determine whether those prediction formulas are feasible for the environment and materials in Taiwan become an important issue. In this study, comparison of theoretical models and accelerated carbonation test conducted in laboratory was presented. Water-cement ratio, pozzolanic material types, replacement rate, carbon dioxide concentrations, humidity and compressive strength are selected as the parameters affecting the theoretical models. The purpose is by using these models combine correction factor to meet the characteristics of concrete neutralization depth prediction formula in Taiwan.
Subjects
concrete
neutralization
pozzolanic material
water-cement ratio
accelerated carbonation
neutralization depth
carbonization reaction zone
carbonation depth prediction
Type
thesis