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Effects of hydroxyethyl methyl cellulose ether on the hydration and compressive strength of calcium aluminate cement

  • Zhongping Wang
  • Yating Zhao
  • Long Zhou
  • Linglin XuEmail author
  • Guizhi Diao
  • Guanghua Liu
Article
  • 12 Downloads

Abstract

Aluminate containing phases such as tricalcium aluminate (C3A) and dodecacalcium heptaaluminate (C12A7) play a key role in the reaction between Portland cement and cellulose ether. In order to simplify such impact from calcium aluminate, calcium aluminate cement (CAC) was applied as a carrier. Effects of hydroxyethyl methyl cellulose ether (HEMC) on the hydration of CAC were characterized by means of isothermal calorimetry, X-ray diffraction analysis, thermal analysis and scanning electron microscopy, respectively. Meanwhile, the setting times, water retention, air content and compressive strengths of HEMC modified CAC pastes or mortars were also determined. Results indicate that HEMC prominently delays the hydration of CAC within 1 day, and the higher dosage of HEMC, the longer setting times. HEMC exerts no obvious impact on the formation amount of CAH10, only leads to a smaller crystal size. From aspect of physical and mechanical properties, the addition of HEMC improves the water retention of fresh CAC mortars, and only with addition of 0.1% HEMC, the water retention of fresh CAC mortars almost approaches 100%. Additionally, the addition of HEMC also significantly promotes the air content of fresh CAC mortars, leading to an obvious decrease in the compressive strengths.

Keywords

HEMC Calcium aluminate cement Hydration evolution Compressive strength 

Notes

Acknowledgements

This work was supported by the National Key Technology R&D Programs of China (2016YFB0303503), the National Natural Science Fund of China (51608382), State Key Laboratory of Solid Waste Reuse for Building Materials (SWR-2017-003) and Fundamental Research Funds for the Central Universities.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Zhongping Wang
    • 1
    • 2
  • Yating Zhao
    • 1
    • 2
  • Long Zhou
    • 1
    • 2
  • Linglin Xu
    • 1
    • 2
    Email author
  • Guizhi Diao
    • 3
  • Guanghua Liu
    • 3
  1. 1.School of Materials Science and EngineeringTongji UniversityShanghaiChina
  2. 2.Key Laboratory of Advanced Civil Engineering Materials, Ministry of EducationTongji UniversityShanghaiChina
  3. 3.State Key Laboratory of Green Building MaterialsChina Building Materials AcademyBeijingChina

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