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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1775–1784 | Cite as

The use of hydrophobicity and pozzolanic reactivity of the PMHS/nanosilica hybrid composites on the water absorption of cement mortar

  • Pengkun HouEmail author
  • Ran Li
  • Haoting Li
  • Ning Xie
  • Xin ChengEmail author
  • L. P. Singh
Article

Abstract

The durability of cement-based materials can be significantly improved by surface treatment with organic or inorganic silica-based treatment agents. In this paper, silica-based organic and inorganic hybrid composites (polymethylhydrosiloxane/nanosilica, PMHS/NS) were synthesized for surface treatment and their performances on hardened cement-based material were determined by measurements of the water absorption rate, water contact angle, and resistance to detachment by rain-washing. The thermogravimetric analysis results showed that 88.33, 65.38, 77.68, and 79.78% of PMHS are physically attached to NS in mixtures at PMHS/NS mass ratios of 1.2, 0.95, 0.7, and 0.6. Moreover, through calorimetric measurement and thermogravimetric analysis, the reaction of the hybrid material with hardened cement-based material was simulated and evaluated by its reaction with Ca(OH)2, i.e., the pozzolanic reaction. Results showed that hydrophobicity has been introduced to the surface of cement-based material after surface treatment and the water absorption rate can be reduced by over 80%. Moreover, the involving of NS could make the hybrid material more rain resistance: hybrid material with PMHS-to-NS mass ratio of 0.6 showed a superior water proofing effect (introduced by its in situ pozzolanic reaction) after simulated rain-washing. This work demonstrated the potential of taking advantages of the hydrophobicity and pozzolanic reactivity of the silica-based hybrid material synergistically in endowing an improved durability of cement-based materials.

Keywords

Hybrid materials Cement-based materials Surface treatment Hydrophobicity Pozzolanic reactivity Synergistic effect 

Notes

Acknowledgements

Supports from National High Technology Research and Development Program (“863 Program,” 2015AA034701), National Key R&D Plan (2016YFE0206100), Natural Science Foundation of China (Grant Nos. 51672107 and 51761145023), and the 111 Project of International Corporation on Advanced Cement-based Materials (No. D17001) are greatly appreciated.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Shandong Provincial Key Lab for Preparation and Measurement of Building MaterialsUniversity of JinanJinanChina
  2. 2.School of Materials Science and EngineeringUniversity of JinanJinanChina
  3. 3.CSIR – Central Building Research InstituteRoorkeeIndia

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