Influence of calium sulfate on some properties of ternary ettringite binder
Abstract
The research in the field of cementitious materials has brought towards many non-traditional binder systems. One of these systems, a ternary binder composed of calcium aluminate cement (CAC), ordinary Portland cement (OPC), and calcium sulfate (C$Hx), called ettringite binder, offers a possibility of very rapid development in mechanical strength. In this research, 18 different ternary mixtures were tested with two types of calcium sulfate, i.e. anhydrite and hemihydrate.
The results show that the type of C$Hx affects the setting time significantly, and the effect of anhydrite on final setting time of binder is more pronounced when compared to those of binder containing hemihydrate. Generally, compressive strength of the binder containing anhydrite is higher at the ages of 3 and 6 hours but after 1 day it gets lower compressive strength compared to that of the binder containing hemihydrate. The optimal mixture using ettringite binder in this research contains 20% cement CEM I, 50% calcium aluminate cement and 30% calcium sulfate. The binder can obtain compressive strength of 20-30 MPa after 3h, 30-40 MPa after 1 day and 50-60 MPa after 28 days of hydration.
Keywords: Early compressive strength; setting time; ettringite binder; anhydrite; hemihydrate.
Received: September 7th, 2017; revised: October 16th, 2017; accepted: November 2nd, 2017
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