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Journal of Thermal Analysis and Calorimetry

, Volume 138, Issue 2, pp 973–981 | Cite as

Sinterization and hydration of synthesized cement clinker doped with sulfates

  • Liming Huang
  • Zhenghong YangEmail author
Article
First Online:

Abstract

This paper aims to evaluate the influence of three kinds of sulfates from the green production of cement on its sintering and hydration. The properties of clinker and hydration were monitored by thermogravimetric and differential thermal analysis (TG–DTA), X-ray diffraction, X-ray fluorescence and isothermal conduction calorimeter. Results indicate that gypsum lowers the decomposition temperature of CaCO3 and all these Sulfates will enhance the solid-phase reaction but increase melting temperature. Sulfates reduce the content of C3S, but K2SO4 and 2CaSO4·K2SO4 is conducive to the formation of β-C2S. The hydration induction period is shortened by the sulfates. K2SO4 and 2CaSO4·K2SO4 improve the early hydration of clinker, but gypsum may lightly reduce the hydration reactivity of clinker in acceleration period. 2CaSO4·K2SO and K2SO can significantly accelerate the compressive strength development of cement clinker before 3 d; by contrast, gypsum is detrimental for that. The precipitation of hydration products (CH and C–S–H) in clinker with sulfates is more than that of clinker without sulfates at 9 h. K2SO4 can accelerate the hydration of clinker without forming ettringite.

Keywords

Cement clinker Sulfates Sintering Degree of hydration 
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Notes

Acknowledgements

The authors are grateful to the financial supports from the Shanghai municipal commission of science and technology (No. 17DZ1200300) and National Key Research and Development Projects of China (No. 2018YFD1101002).

Supplementary material

10973_2019_8294_MOESM1_ESM.pdf (400 kb)
Supplementary material 1 (PDF 399 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Key Laboratory of Advanced Civil Engineering Materials Ministry of EducationTongji UniversityShanghaiChina
  2. 2.School of Materials Science and EngineeringTongji UniversityShanghaiChina

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