Changes in microstructure characteristics of cement paste on carbonation
By Vineet Shah, Karen L. Scrivener, Bishwajit Bhattacharjee, Shashank Bishnoi. Cement and Concrete Research, 2018
487 citations recorded by the source corpus.
Abstract This study investigates the influence of carbonation on the microstructure of cement paste cast with Ordinary Portland Cement (OPC), fly ash based Portland Pozzolana Cement (PPC) and Limestone Calcined Clay Cement (LC3) using X-ray diffraction (XRD), thermal analysis (TGA), scanning electron microscope (SEM) and mercury intrusion porosimeter (MIP). A comparison is made between samples exposed to 3% carbon dioxide concentration and those exposed to natural CO2 concentrations. It is observed that the products formed on carbonation are similar in both the exposure conditions. Distinct rims corresponding to decalcified C-S-H are observed around clinker grains in the carbonated samples. Coarsening of pore structure is observed on carbonation in all the cements and an increase in the total porosity is observed in blended cements. Thermodynamic modeling indicates irrespective of the type of cement the total solid volume is reduced on complete carbonation. The volume change occurring on carbonation obtained from experimental results and thermodynamic modeling are compared.
Subfields: Civil and Structural Engineering, Environmental Engineering
View Paper: https://www.semanticscholar.org/paper/f1ebb9c5daa4fab470945d60bcecc3691311278a
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Civil and Structural Engineering
In Environmental Engineering
Citations in the corpus
- The Durability of Alkali-Activated Materials in Comparison with Ordinary Portland Cements and Concretes: A Review (2020, background): “The whole process is accompanied by an overall reduction in the volume of the products and an increase in porosity and pore size [95,96].”