Effect of Iron Phase on Calcination and Properties of Barium Calcium Sulfoaluminate Cement

Abstract

In this paper, the effect of iron phase content on the calcination and properties of clinker and barium calcium sulfoaluminate cement was studied. The compressive strength of the samples was tested and combined with an XRD and SEM-EDS analysis, and the microstructure and composition of the barium calcium sulfoaluminate clinker and hydrated samples were characterized. The results showed that the oval-shaped particles were C2S minerals, and the hexagonal plate-shaped or rhombohedral dodecahedral particles were C2.75B1.25A3S¯. The Ba element was mainly distributed in the barium calcium sulfoaluminate region, and some of it was dissolved in C2S; the Fe element was distributed between C2.75B1.25A3S¯ and C2S crystal grains in the form of an iron phase solid solution, which acted as a solvent. When the iron phase composition was C4AF and the iron phase content was 5%, the early hydration and later strength were better, and the compressive strength after curing for 1, 3 and 28 days was 73.2 MPa, 97.9 MPa and 106.9 MPa, respectively. A proper amount of the iron phase can reduce the eutectic point of the sintered mature material system, increase the amount of liquid phase, reduce the viscosity of the liquid phase, effectively accelerate the migration of mineral ions and promote the formation and growth of minerals.

Temperature Effects on Fe(OH)3 Gel Phase Nanostructures: Implications for the Performance Regulation and Application of Calcium Sulfoaluminate Cement

“…5 Meanwhile, CSA cement has a low firing temperature (approximately 100− 200 °C lower) and better grindability of clinker, which greatly reduces energy consumption. 6 In addition, CSA cement is becoming increasingly popular in rapid repair and marine engineering due to its early strength, rapid setting, corrosion resistance, and low shrinkage properties. 7−9 At the same time, ferric-rich calcium sulfoaluminate (FR-CSA) cement with high Fe content is more favorable in terms of performance, low carbon, and cost contribution.…”

“…With the proposal of the global sustainable development strategy, low-carbon and environmentally friendly calcium sulfoaluminate (CSA) cement has gradually attracted the attention and research of many scholars. , Compared with PC, CSA cement has greater advantages in raw materials and carbon dioxide emissions (limestone consumption is reduced by more than half and carbon dioxide emissions are reduced) . Meanwhile, CSA cement has a low firing temperature (approximately 100–200 °C lower) and better grindability of clinker, which greatly reduces energy consumption . In addition, CSA cement is becoming increasingly popular in rapid repair and marine engineering due to its early strength, rapid setting, corrosion resistance, and low shrinkage properties. − At the same time, ferric-rich calcium sulfoaluminate (FR-CSA) cement with high Fe content is more favorable in terms of performance, low carbon, and cost contribution. , Therefore, the prominent potential of CSA cement has led to its being widely researched and applied as a potential PC alternative.…”