Formation and early hydration characteristics of C2.75B1.25A3$ in binary system of C2.75B1.25A3$-C2S

Shoude Wang; Yongbo Huang; Chenchen Gong; Xinghua Fu; Lingchao Lu

doi:10.3989/mc.2016.02915

Authors

Shoude Wang Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan
Yongbo Huang Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan
Chenchen Gong Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan
Xinghua Fu Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan
Lingchao Lu Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan

DOI:

https://doi.org/10.3989/mc.2016.02915

Keywords:

Belite, Barium calcium suphoaluminate, Formation, Hydration, Early mechanical strength

Abstract

C_2.75B_1.25A₃$ (2.75CaO•1.25BaO• 3Al₂O₃• SO₃) is one of the important minerals and it govern-directly the early-strength of belite-barium calcium sulphoaluminate cement. In this paper a binary system C_2.75B_1.25A₃$-C₂S is selected to investigate the formation of C_2.75B_1.25A₃$. In the range of 1100 °C–1200 °C, the earlier formed C₂S hinders the formation of C_2.75B_1.25A₃$. On the contrary, when the temperature is in the range of 1200 °C–1350 °C, the initially formed C₂S could provide a surface for the nucleation of C_2.75B_1.25A₃$ and cut down the potential barrier (?Gk*) for the heterogeneous nucleation of C_2.75B_1.25A₃$, which contributes to its formation. Moreover, at 1350 °C, the large amount of previously formed C₂S benefits the extent of formation of C_2.75B_1.25A₃$. The possible reason was that it could prevent sulfur evaporation. In early hydration age, AFm and AFt originating from C_2.75B_1.25A₃$ hydration are found within 2 h and 12 h under 95% RH at 1 °C, respectively, whereas C₂S is unhydrated at this moment.

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