The effect of carbonation accelerator on enhancing the carbonation process and mechanical strength of air-hardening lime mortars

Impact Factor:7.4

DOI number:10.1016/j.conbuildmat.2024.136067

Journal:Construction and Building Materials

Abstract:Ammonium carbonate was used as the carbonation accelerator for air-hardening lime mortars in this study. Various analytical methods, including XRD, IR, TGA-DSC and SEM were employed to access the phase transformation, degree of carbonation and microstructural features of the lime-based mortars. The paper explores the correlation between the mechanical strength, microstructure of cured lime mortars and the composition/carbonation degree with the crystallization behaviors in Ca(OH)2/CaCO3 binders. The results indicate that ammonium carbonate significantly accelerates the carbonation reaction and increases the early mechanical strength of air-hardening lime mortars. The mechanical strength of these modified lime mortars can be comparable to that of natural hydraulic lime (NHL). The aggregation behaviors of nano-CaCO3 under kinetic control, are believed to contribute much to the compact pore-structures and robust mechanical strength of lime mortars. This viable accelerating carbonation method holds promise for enhancing the properties of various lime-containing building materials in conservation and modern buildings.

First Author:Mengjun Jia

Co-author:Yifan Zhao,Xuan Wu

Indexed by:Journal paper

Correspondence Author:Xiao Ma

Volume:425,

Page Number:136067

Translation or Not:no

Date of Publication:2024-04-26

Included Journals:SCI、EI

Links to published journals:https://www.sciencedirect.com/science/article/abs/pii/S095006182401208X?dgcid=author