Effects and mechanisms of surface-treatment of cementitious materials with nanoSiO2@PCE core-shell nanoparticles. (30th March 2018)

• Record Type: Journal Article
• Authors: Gu, Yue; Ran, Qianping; She, Wei; Shu, Xin; Liu, Jiaping
• Is Part Of: Construction & building materials. Volume 166(2018)
• Page Start: 12
• Page End: 22
• Publication Date: 2018-03-30
• Subjects: nanoSiO2 -- Core-shell structure -- Surface treatment -- Durability; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.01.082
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Explore the potential of NS@PCE to densify the surface of cementitious materials. If shell chemical structure (PCE) was similar, a moderate shell-core ratio seems more reasonable. A hypothesis was proposed to explain the surface-treatment effect of nanoparticles. Abstract: A commercial interest in the improvement of durability is driving efforts to develop new generation of surface-treatment agents. In the previous paper, a series of nanoSiO2 -polycarboxylate superplasticizer core-shell nanoparticles (NS@PCE) were synthesized by "grafting to" method. In this paper, we aim to explore the potential of NS@PCE to densify the surface of cementitious materials, and to study the mechanism of nanoparticles surface-treatment process by measuring water absorption ratio, dispersion stability, pozzolanic reactivity, and mercury intrusion porosimetry. Results show that NS@PCE is effective in reducing the water absorption. Various NS@PCE present different influences, it seems that NS@PCE with a moderate shell-core ratio is a more reasonable choice. A hypothesis was proposed to explain the surface-treatment effect of nanoparticles, it utilizes two properties (dispersity and pozzolanic reactivity) of nanoparticles to describe their refining-pore performance. This research indicates a new pathway for nanoSiO2 to optimizing cementitious materials.