Effect of calcium silicate hydrate – polycarboxylate ether (C-S-H–PCE) nanocomposite as accelerating admixture on early strength enhancement of slag and calcined clay blended cements. (May 2019)

• Record Type: Journal Article
• Authors: Kanchanason, V.; Plank, J.
• Is Part Of: Cement and concrete research. Volume 119(2019)
• Page Start: 44
• Page End: 50
• Publication Date: 2019-05
• Subjects: C-S-H (B) -- Polycarboxylate (D) -- Slag cement (D) -- Calcined clay cement (D) -- Pozzolanic reaction (A); Cement -- Periodicals; Cement -- Research -- Periodicals; Concrete -- Periodicals; Concrete -- Research -- Periodicals; Ciment -- Périodiques; Béton -- Périodiques; Cement; Concrete; Periodicals; 620.135
• DOI: 10.1016/j.cemconres.2019.01.007
• Languages: English
• ISSNs: 0008-8846

Abstract

Abstract: The effectiveness of a self-synthesized C-S-H-PCE nanocomposite on early strength development of slag and calcined clay blended cements (35 wt% slag or calcined clay) was studied. Addition of C-S-H-PCE was found to substantially increase mortar strength at early ages, particularly after 6–24 h of curing. Isothermal heat flow calorimetry and in-situ XRD measurements indicate that silicate hydration in cement is significantly accelerated. Most remarkably, C-S-H-PCE also speeds up the pozzolanic reaction of slag and calcined clay and stimulates the formation of hemicarbo aluminate (Hc), especially in calcined clay cement. Thus, C-S-H-PCE can foster more widespread use of CEM II/III. Graphical abstract: Unlabelled Image Highlights: C-S-H–PCE increases early strength (0–24 h) of blended cements. Cements blended with slag or calcined clay (35 wt%) were tested. The nanocomposite accelerates cement hydration by providing C-S-H seeds. Moreover, the pozzolanic reaction of slag and calcined clay is accelerated. C-S-H-PCE also stimulates the formation of Hc in the calcined clay cement.