Abstract
This work investigates medium cement refractory castable with additives of carbon and polypropylene fibers. The peculiarities of microstructure changes in the fiber and castable matrix contact zone, channel formation, and changes of cold crushing strength of fiber additives, which have a refractory castable matrix under temperature treatment, were investigated. The investigation results allowed to predict that using a mix of fibers more effective than using them individually. The influence of fiber additives on the mechanical characteristics and thermal shock resistance of the refractory castable with fiber additives was tested. It was found that the addition of carbon fiber has a positive impact on the thermal shock resistance of the investigated castable, which is confirmed by the results obtained by thermal cycling, as well as by the values calculated for thermal shock resistance R4 and Rst. In addition, the results of the investigation of thermal cycling show that the value of the thermal shock resistance was highest when a mixed fiber additive (CF+PP) was used.
Highlights
Refractory castable is widely used in structures of different heat equipment in the cement, iron and steel, petrochemical industries and others (Nishikawa 1984).Calcium aluminate cements and special ultra-dispersive additives and various deflocculants are used in the production of refractory castables
Combustible additives of carbon and polypropylene fiber contribute to the formation of densified hydrate microzones during hardening in the matrix of medium cement refractory castable with the calcium aluminate clinker filler
It is noteworthy that in the case where the mix fiber (CF+PP) additive is used in refractory castable, Cold crushing strength (CCS) increases ~30%, as compared to the CCS of the control specimen of castable
Summary
Refractory castable is widely used in structures of different heat equipment in the cement, iron and steel, petrochemical industries and others (Nishikawa 1984). Organic fibers (polypropylene, polyamide and others) are required for dense and deflocculated castables to facilitate the removal of water vapors in drying and initial heating (Innocentini et al 2002; Leung, Balendran 2002; Peret et al 2003) because castables are prone to explosive spalling under rapid heating (Innocentini et al 2003a, 2003b; Olivier, Fabien 2014). Journal of Civil Engineering and Management, 2017, 23(5): 672–678 at the drying stage, preventing cracking This could later have a positive effect on thermal resistance properties of refractory castable. Some of the obtained data were compared with the values of thermal shock resistance determined by the criteria R4 and Rst
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