Effect of Aluminum Sulfate on the Hydration of Tricalcium Aluminate. Issue 2 (April 2021)

• Record Type: Journal Article
• Authors: Jing, Xiuyan; Zhang, Yan; Liu, Huaqing; Liu, Jialong; Kong, Sen
• Is Part Of: IOP conference series. Volume 719:Issue 2(2021)
• Publication Date: 2021-04
• Subjects: Aluminum sulfate -- C3A -- Portland cement -- alkali-free accelerator.; Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/719/2/022079
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: Aluminum sulfate (AS), as the main composition of alkali-free accelerator, was widely used to accelerate the setting and promote the early strength in the sprayed concrete. In this study, effect of AS on the hydration reaction of C3 A was investigated, which is one of the most important cement clinker minerals in the early age of cement hydration. The hydration reaction and products of C3 A-AS system were characterized with hydration heat test, X-ray diffraction, thermogravimetric analysis, scanning electron microscope, and thermodynamic modeling. Results indicate that AS could hinder the hydration reaction in the very early age but then accelerate C3 A hydration by producing SO4 -AFm, OH-AFm, and gibbsite. The findings are expected to provide theoretical guidance for the product research and engineering application of alkali-free accelerator.