Title: Effect of (κ)- and (ι)-Carrageenans on Rheology and Strength Development of Cement-Based Materials

Author(s): Asma Boukhatem, Kamal Bouarab, and Ammar Yahia

Publication: Materials Journal

Volume: 119

Issue: 1

Appears on pages(s): 207-219

Keywords: cement suspensions; compressive strength; hydration kinetics; rheology; viscosity-modifying admixtures; (κ)-(ι)-carrageenan

DOI: 10.14359/51734196

Date: 1/1/2022

Abstract:
The effect of kappa (κ)- iota (ι)-carrageenan used in combination with two different types of high-range water reducer (HRWR) on the rheological behavior, hydration kinetics, and strength development of cement-based materials was evaluated. The use of (κ)-(ι)-carrageenan increased the yield stress, plastic viscosity, rigidity, and structural buildup kinetics of cement suspensions. However, the combined addition of (κ)-(ι)-carrageenan with HRWR reduced the yield stress and plastic viscosity. Although the addition of (κ)-(ι)-carrageenan extended the dormant period of cement suspension, (κ)-(ι)-carrageenan did not significantly affect early-age compressive strength development. Compared to (κ)-carrageenan, the use of the (κ)-(ι)-carrageenan combination reduced the dormant period of cement suspensions by approximately 50%, resulting in a 50% increase of compressive strength.