ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 64, (4) 398 - 406 (2020)

Heikal Mohamed 1,2, Helmy Ivon M. 3, Awad Shereen 4, Ibrahim Noha S. 3 , 4
1 Chemistry Department, Faculty of Science, Benha University, Benha, Egypt
2 Chemistry Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), P.O Box 90950, Riyadh 11623, Saudi Arabia
3 Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt
4 Faculty of Engineering, Benha University, Benha, Egypt

Keywords: Clay nanoparticles, FA, FBFS, Hydration characteristics, Compressive strength

The present work aims to investigate the influence of clay nanoparticles (CNP) on the mechanical, physical and microstructure cement pastes composites. The cement paste composites were formulated by adding 20-60 mass% fly ash (FA), fine blast furnace slag (FBFS) and/or 6 mass% clay nanoparticles. The physico-chemical properties of the cement paste composites (CPC) were improved by the substitution of 6% CNP in instead of OPC (ordinary Portland cement) in the consistence of the superplasticiser (SP). The physico-mechanical properties and hydration characteristics were investigated by the determination of the setting times (STs), the consistency (W/C, %), the free lime (FL), the combined water (Wn), the gel/space ratio (X), the total porosity (TP), the compressive strength (CS) and the bulk density (BD). The compressive strength values of the cement-CNP hybrid were higher than those of the cement paste composites without CNP. The STs of CPC-pastes containing CNP were accelerated. The CNP showed synergetic effect with the FA and FBFS to enhance the performance of pozzolanic reaction to form supplementary CSH, CAH and CASH, these phases are responsible for bridging, producing a rigid closed compact structure; hence the compressive strength, gel/space ratio, bulk density and chemically combined water increased, whereas the porosity decreased.

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doi: 10.13168/cs.2020.0027
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