Effects of amino acids on the multiscale properties of carbonated wollastonite composites

•The addition of amino acids increased the pH of the carbonated matrix.•CaCO3 polymorphs stabilized using amino acids did not change after moisture exposure.•Ca2+ leaching from the carbonated matrix was increased due to the amino acid addition.•Amino acids increased the mean elastic moduli and fract...

Full description

Saved in:
Bibliographic Details
Published in:Construction & building materials 2023-04, Vol.374, p.130816, Article 130816
Main Authors: Khan, Rakibul I., Intesarul Haque, Muhammad, Siddique, Salman, Landis, Eric N., Ashraf, Warda
Format: Article
Language:English
Subjects:
Amino Acids
Biomineralization
CaCO3
Calcium Silicate
Carbonation
CO2 footprint
Fracture toughness
Leaching
Polymorphs
Wollastonite
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•The addition of amino acids increased the pH of the carbonated matrix.•CaCO3 polymorphs stabilized using amino acids did not change after moisture exposure.•Ca2+ leaching from the carbonated matrix was increased due to the amino acid addition.•Amino acids increased the mean elastic moduli and fracture energy of the composites. This article presents an insight into the effects of amino acids on the moisture susceptibility, nanomechanical properties, and fracture properties of carbonated wollastonite composites. Paste samples containing various concentrations of amino acids were subjected to a CO2-rich environment. The addition of amino acids resulted in the formation of amorphous calcium carbonate (ACC), vaterite, and aragonite, instead of calcite, in the carbonated composites. Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and nanoindentation were performed for microstructural analysis. Inductively coupled plasma-optical emission spectrometry (ICP-OES) was performed to determine the leaching of Ca2+ and Si2+ ions from carbonated wollastonite composites. It was observed that the chain lengths of the amino acids have an influence on the formation of crystal phases. For determining fracture properties, the Jenq-Shah model was performed using a notched beam. It was observed that amino acids reduced carbonation reaction and improved fracture properties by 156 %. The formation of metastable CaCO3 enhanced the nanomechanical properties of this carbonated system.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2023.130816