World Congress on

Civil, Structural, and Environmental Engineering

  • Renaissance London Heathrow Hotel
  • March 10-11, 2025
;
Prof. Paulo Cesar de Morais

 

Prof. Paulo Cesar de Morais

Catholic University of Brasilia
Brazil

Abstract Title: Investigating the Impact of Nanoadditives in Portland-based Cement

Biography:

Professor Paulo César De Morais (H60), PhD, was full Professor of Physics at the University of Brasilia (UnB) – Brazil up to 2013. Appointed as UnB’s (Brazil) Emeritus Professor (2014); Visiting Professor at the Huazhong University of Science and Technology (HUST) – China (2012-2015); Distinguished Professor at the Anhui University (AHU) – China (2016-2019); Full Professor at the Catholic University of Brasília (CUB) – Brazil (2018); CNPq-1A Research Fellow since 2010; 2007 Master Research Prize from UnB. He held two-years (1987-1988) post-doc position with Bell Communications Research, New Jersey – USA and received his Doctoral degree in Solid State Physics (1986) from the Federal University of Minas Gerais (UFMG) – Brazil. With more than 13,000 citations, He has published more than 500 papers (Web of Science), delivered more than 200 international invited talks, and filed more than 15 patents.

Research Interest:

This talk will focus on the present status of how nanosized supplementary cementitious material (NSCM) can be used to improve the mechanical properties and durability performance of cementitious composites (cement paste, mortar and concrete). The emphasis here will be on the use of nanosilica (NS), which has been taken cement composites to higher performance levels. Despite the performance improvements in many properties, NS has a great agglomeration tendency, which makes it a difficult material to handle beneficially in a broad perspective. In addition, there is the occurrence of autogenous shrinkage of cementitious materials caused by the accelerated development of mechanical strength in a short period of time. In view of these challenging aspects, recent achievements in monodisperse NS via surface functionalization methods have provided a significant development of silica-decorated nanomaterials (among the functional groups: amine, carboxyl, and glycol), leading to functionalized nanosilica (FNS). FNS can be developed with chemically grafted functional groups that can improve their properties as NSCM. Therefore, a comprehensive evaluation of functionalized NS using amino-terminated 3-aminopropyltriethoxysilane (APTES) and based on the silica gel process with different levels of functionalizing agent will be presented. Data extracted from representative samples and using different experimental techniques, will be presented and discussed. The performed analyses show that typical FNS samples reveal sophisticated surface changes involving chemical reactions, proton transferring and hydrogen bonding, leading to different end products and presenting different surface coating composition, hydrodynamic particle size profile and zeta potential. Finally, the performed analyses emphasize the signatures of the onset of the first dressed closed shell while using APTES.

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