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Open AccessArticle

Permeable Nanomontmorillonite and Fibre Reinforced Cementitious Binders

1
Department of Mathematics and Engineering Sciences, Hellenic Army Academy, Evelpidon Avenue, 166 72 Attika, Greece
2
Hellenic Ministry of Culture, Directorate for the Restoration of Byzantine & Post-Byzantine Monuments, Tzireon 8-10, 11742 Athens, Greece
3
Group of Sustainable Composites, Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, 2815 Gjøvik, Norway
4
BRE Centre for Innovative Construction Materials, University of Bath, BA2 7AY Bath, UK
*
Author to whom correspondence should be addressed.
Materials 2019, 12(19), 3245; https://doi.org/10.3390/ma12193245
Received: 9 September 2019 / Revised: 29 September 2019 / Accepted: 2 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
Clinker reduction in cementitious binders is of paramount importance today, and nanotechnology has extended permissible limits. In the present study, a reference binder consisting of 60% Portland cement, 20% limestone, 20% fly ash, 3% polyvinyl alcohol (PVA) fibres and 2% superplasticizer is optimized with three different types of nano-montmorillonite (nMt) dispersions; two organomodified ones and an inorganic one at different proportions (0.5% to 4%). Flexural strength, measured on day 7, 28, 56 and 90, was improved after day 28 with the addition of inorganic nMt. Thermal gravimetric analyses carried out on day 7, 28, 56 and 90 coupled with x-ray diffraction (at day 28) showed a distinctively enhanced pozzolanic reaction. Backscattered electron imaging confirmed changes in the microstructure. Late age relative density measurements of the nMt cementitious nanocomposites showed higher values than these of the reference paste, which can be attributed to better particle packing. Mercury intrusion porosimetry measurements give support to the optimal nMt dosage, being 1% by total mass of binder and water impermeability tests (modified with BS EN 492:2012) suggest that inorganic nMt can be a viable option material where permeability constitutes a prerequisite. Suggestions for further activation of the nMt-fibre reinforced cementitious nanocomposites were also made. View Full-Text
Keywords: Portland limestone fibre-cement binders; nanomontmorillonite; PVA fibres; flexural strength; TGA/dTG; XRD; MIP; water impermeability tests Portland limestone fibre-cement binders; nanomontmorillonite; PVA fibres; flexural strength; TGA/dTG; XRD; MIP; water impermeability tests
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Papatzani, S.; Grammatikos, S.; Paine, K. Permeable Nanomontmorillonite and Fibre Reinforced Cementitious Binders. Materials 2019, 12, 3245.

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