Related Experiment Video
Updated: May 28, 2025

Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
Published on: September 23, 2018
Hydration behaviors, workability, and strength variations in direct aqueous carbonation (DAC) of Portland cement
Zhiguang Wang1, Hangjie Zhou1, Songsong Lian2
1College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China.
Abstract:
This study investigates the mechanisms behind direct aqueous carbonation in concrete manufacturing, focusing on its effects on workability and strength. Through an analysis of cement paste under varying water-to-cement ratios (0.5, 0.55, and 0.6) and CO2 additive amount (0%, 0.1%, and 1%), the results demonstrate that early carbonation accelerates the setting process. Higher CO2 additive amounts and lower w/c ratios further reduce setting time and fluidity, also increase free water consumption, which negatively affects the pore structure and compressive strength. However, as the transformation of amorphous calcium carbonate to calcite, enhancing hydration during curing and ultimately improving the final compressive strength. This study elucidates the various effects of CO2 addition to cement paste on fresh and hardened paste during the direct aqueous carbonation process, shedding light on how it influences hydration, workability, and strength, contributing to sustainable concrete production.
Related Concept Videos
Porosity in Cement Paste
The balance of water to cement in the mix is...
Strength and Heat of Hydration
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
Hydration of Cement
Soundness of Cement
Carbonation Shrinkage
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
Types of Cement II

