Application of an alternative way for silica fume dispersion in cement pastes without ultrasonication. (January 2019)

• Record Type: Journal Article
• Authors: Tsardaka, Eirini-Chysanthi; Stefanidou, Maria
• Is Part Of: Cement and concrete research. Volume 115(2019)
• Page Start: 59
• Page End: 69
• Publication Date: 2019-01
• Subjects: Silica particles dispersion -- Sodium bicarbonate -- pH -- Cement pastes -- Ultrasonication; Cement -- Periodicals; Cement -- Research -- Periodicals; Concrete -- Periodicals; Concrete -- Research -- Periodicals; Ciment -- Périodiques; Béton -- Périodiques; Cement; Concrete; Periodicals; 620.135
• DOI: 10.1016/j.cemconres.2018.10.002
• Languages: English
• ISSNs: 0008-8846

Abstract

Abstract: The dispersity of silica particles affects their influence in a composite. In this work, a solution for silica fume (SF) dispersion is proposed for application in cement mixtures, as de-agglomeration method. Sodium bicarbonate salt solution 0.01 M pH 13, with addition of SF consist the proposed dispersion (SBCS). The solution has low cost it is stable, easy and quick to be prepared and does not require special equipment. Dispersion was characterized using particle size distribution and ATR. Cement pastes with ultrasonicated colloidal suspension of SF in water (US) and with sodium bicarbonate - SF (CDS) are compared. DTA-TG, XRD analysis and SEM observation, along with the determination of mechanical and physical properties of the produced specimens are reclaimed. SBCS gave illustrative results after subjecting the specimens in durability tests. The results indicated that SBCS can be used to disperse SF affecting positively the microstructure and the macro-properties of cement systems. Graphical abstract: Unlabelled Image Highlights: A simple and effective method for dispersing silica fume before adding it in cement mixtures Combination of concentration of sodium bicarbonate solution and pH can regulate the dispersion of silica fume. Protocol for the evaluation of the efficiency of dispersion and for testing the properties of the cement product Specific analytical techniques for recording the properties of nano-modified cement pastes