KnE Engineering
ISSN: 2518-6841
The latest conference proceedings on all fields of engineering.
Modification of AA Binder Matrix with the Use of PP Fibres – Strength Investigations
Published date: Apr 13 2020
Journal Title: KnE Engineering
Issue title: REMINE International Conference on Valorization of Mining and Industrial Wastes into Construction Materials By Alkali-activation
Pages: 111–123
Authors:
Abstract:
The alkali-activated (AA) binders are assumed to be more ecological than ordinary Portland cement (OPC) binders, because of lower energy requisition and lower CO2 emissions during the production processes. The purpose of using polypropylene(PP) fibres in traditional concrete, geopolymers and mortars is to improve strength properties by inhibiting the growth of cracks that usually occur due to shrinkage, as well as improving the mechanical properties. This paper presents laboratory research into the fibre reinforcement impact on the strength properties of an AA binder made of fly ash suspension. In addition to the suspension, which is a waste product from the coal power plant, recycled ground glass and metakaolin were used as the precursors. The chemical activator of the geopolimerisation reaction was prepared using sodium hydroxide and sodium silicate. Five different sets of the prism samples 40x40x160 mm were made (with different PP fibres ratio, from 0% to 2% by weight) and then the flexural and compressive strength tests were performed. The addition of polypropylene fibres increased the bending strength, which produced the beneficial effect of reducing crack propagation in cases of tensile stress occurrence.
Keywords: alkali-activated binders, geopolymers, polypropylene fibres, fly ash suspension, bending strength
References:
[1] Uliasz-Bocheńczyk, A. and Mokrzycki, E. (2003). Emisja dwutlenku węgla w przemyśle cementowym (Carbon dioxide emissions in the cement industry), Zeszyt specjalny, Polityka Energetyczna, vol. 6, pp. 367-375.
[2] Prinsse, S. (2017). Alkali-activated concrete: development of material properties (strength and stiffness) and flexural behaviour of reinforced beams over time. Master’s thesis, Delft University of Technology.
[3] PN-EN 14889-2 (2007). Fibres for concrete. Part 2: Polymer fibres. Definitions, specifications and conformity.
[4] Fejdyś, M. and Łandwijt, M. (2010). Włókna techniczne wzmacniające materiały kompozytowe (Technical fibres reinforcing composite materials). (Techniczne Wyroby Włókiennicze, Instytut Technologii Bezpieczeństwa MORATEX).
[5] Hycnar, E., Jończyk, M. W. and Ratajczak, T. (2017). Popioły lotne i iły beidellitowe z Bełchatowa jako składniki mieszanin samozestalających się (Fly ash and beidellite clays from Bełchatów as components of self-solidifying mixtures), Zeszyty naukowe, vol.100, pp. 37-48.
[6] ArtGlas Recykling. (2019). Mączka szklana – information material available on the website: http://www. artglas-recykling.pl/maczka-szklana.html
[7] ASTRA. (2019) Astra MK 40 – information material available on the website: http://www.astra-polska. com/oferta/betony-przemyslowe/astra-mk-40/
[8] Sylan. (2019). Belmix - włókna polipropylenowe do betonów i zapraw (Belmix - polypropylene fibres for concretes and mortars) – information material available on the website: https://sylan.pl/index.php?p= oferta
[9] Imbabi, M. S., Carrigan, C. and McKenna, S. (2012). Trends and developments in green cement and concrete technology. International Journal of Sustainable Built Environment, vol. 1, issue 2, pp. 194-216.
[10] Dawczyński, S., Soczyński, M. and Górski, M. (2019). Feasibility and strength properties of the geopolymeric binder made of fly ash suspension. MATEC Web of Conferences, vol. 262, pp. 1-6.
[11] Dawczyński, S., Kajzer, A. and Górski, M. (2018). Investigation on strength development in geopolymer made of power plant fly ash suspension, in RILEM Proceedings PRO 121. (Paris: RILEM Publications), pp. 467-472.
[12] PN-EN 1015-11 (2001). Methods of test for mortar for masonry – Part 11: Determination of flexural and compressive strength of hardened mortar.