Naslov
Alkaline resistance of recycled tyre polymer fibres for cement composites

Autori
Mrduljaš, Branka ; Pucić, Irina ; Didulica, Katarina ; Baričević, Ana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
28HSKIKI : 28th Croatian Meeting of Chemists and Chemical Engineers and 6th Symposium Vladimir Prelog : Book of Abstracts / Rogošić, Marko - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2023, 202-202

Skup
28th Croatian Meeting of Chemist & Chemical Engineers and 6th Symposium Vladimir Prelog

Mjesto i datum
Rovinj, Hrvatska, 28.03.2023. - 31.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Recenziran

Ključne riječi
Waste ; Fibres ; RTPF ; Alkaline resistance

Sažetak
Fibres of various types can be added to cementitious composites to reduce their autogenous shrinkage and/or post-cracking. [1] The high strength and modulus of elasticity of fibres limit the propagation of cracks in a brittle cement matrix resulting in longer service life and lower maintenance costs for structures. However, fibre production has a significant negative environmental impact. To meet the EU's transition to a carbon-neutral, resource-efficient, circular and competitive economy, the use of secondary materials is strongly encouraged. For example, waste fibres such as recycled tyre polymer fibres (RTPF) [2] could be used to reinforce cement composites if found resistant enough to highly alkaline environment (pH > 12). To simulate cement matrix conditions and evaluate alkali resistance, RTPFs were exposed to a synthetic pore solution for 90 days. The solution was prepared by dissolving calcium, sodium and potassium hydroxides and calcium sulphate in water (2.2 g/L Ca(OH)2, 3.99 g/L NaOH, 16.83 g/L KOH, 0.34 g/L CaSO4×H2O) so that the pH, ionic composition and strength were adjusted to best simulate cement matrix. [3] The morphology of untreated and treated RTPF was studied by SEM, thermal properties by DSC and TGA and FTIR were used to determine the chemical changes. Partial and limited alkaline hydrolysis was observed in treated RTPF, so it can be suggested that it can be used at least to limit the volume deformation of the cement composite at early age. The reduction in cracking depends on the mechanical properties of the fibres, which could not be evaluated because the RTPFs are too short. This highlights the difficulty of establishing standardized testing protocols for different types of (waste) fibres that could potentially be used to reinforce cement composites.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Kemijsko inženjerstvo

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