Effect of n-CaCO3 on fresh, hardened properties and acid resistance of granulated blast furnace slag added mortar

• Published in: Journal of Building Engineering 2020-05, Vol.29, p.101209, Article 101209
• Main Authors: Balcikanli Bankir, Muzeyyen, Ozturk, Murat, Sevim, Umur Korkut, Depci, Tolga
• Format: Article
• Language: English
• Subjects: Fresh properties; Mortar; n-CaCO3; Slag; XRD
• ISSN: 2352-7102; 2352-7102
• DOI: 10.1016/j.jobe.2020.101209

Nano size CaCO3 (n-CaCO3) particles were used as an additive into the Ground Granulated Blast Furnace Slag (GGBS) added mortar to investigate their effects on fresh, hardened properties and acid resistance. Setting time, normal consistency, flow diameter, volume stability, flexural and compressive strengths tests were performed in the present study. In addition, to see how n-CaCO3 and GGBS affect the acid resistance of the mortars, the produced mortar samples were stored in the acid solution and their mass losses were determined. Mortars including 20% GGBS (replaced with cement by weight) with 0%, 1% and 2% n-CaCO3 (added by weight of cement) and a control mortar which has no GGBS and n-CaCO3were produced. Experimental results showed that addition of 1% n-CaCO3 were helpful to increase the both flexural and compressive strength and resonance frequency of mortars 11.54%, 11.9% and 10%, respectively and the setting period was shortened, 7.4% according to control sample. XRD analysis showed that the chemical structure of the mortar samples before and after acid attack did not change, significantly. •The setting period was getting shorter with the addition of n-CaCO3 up to 1%, after this value, it began to extend.•There was no significant effect on the compressive strength more than 1% of the addition of n-CaCO3.•Using the resonance frequency, it could be predicted the strength values of structural elements.