No-Cement Refractory Shotcrete and Gunning Mixes

Hong Peng, Bjørn Myhre

Elkem Silicon Materials, Kristiansand/Norway


Volume 9, Issue 4, Pages 94 - 98


This work focuses on the development of microsilica-gel bonded no-cement shotcrete and dry-gunning mixes using two speciality products, SioxX-Flow as deflocculant and SioxX-Set as accelerator. Critical installation properties were first investigated in laboratoryscale, then full-scale shotcreting and dry-gunning trials were carried out by industrial partners. The sprayed panels were cut and used for mechanical and hot-properties evaluations. The results demonstrate that cement-free, shotcreted and dry-gunned microsilica-gel bonded mixes not only exhibit good installation properties and low rebound, but also provide enhanced hot-properties compared to low-cement castables (LCCs).


shotcreting, dry-gunning


[1] ACI committee 506. Guide to shotcrete. American Concrete Institute, ACI 506R-90 3rd Printing, January (1994), 3, sec. 1.5 [2] Allen, W.G.: Advanced equipment system for refractory placement. UNITECR 97, New Orleans 1997, 523–530 [3] Hundere, A.M.; Myhre, B.; Sandberg, B.: Free flowing castables – a prerequisite for wetgunning of refractory castables. In: Proc. VIIth Int. Metallurgical Conf., Ustron, Poland, May 20–23 (1997) 27–36 [4] Myhre, B.; Ødegård, C.; Feldborg, H.: Sprayable castables, the effect of sample preparation on properties. The XXIX ALAFAR Congress, Pucon, Chile, Dem. 2000 [5] Esanu, F.; Troczynski, T.; Opreah, G.: Flash flocculation: A new concept for spray-gunning of self-flowing refractory castables. Refr. Appl. 4 (1999) [3] 6–9 [6] Motoki, E.; Tanaka, N.: Evaluation of quick setting additives for wet gunning installing. J. of Technical Ass. of Refractory 21 (2001) [2] 111–115 [7] Pileggi, R.G.; et al.: Shotcrete performance of refractory castable. Refractories Application and News 8 (2003) [3] 15–20. [8] Iwasaki, I.; Takeshige, T.: Fukuoka-ken, Japan Patent US005869145. [9] Chen, C.-H.: Application and research of wetgunning based on colloidal silica for main trough of blast furnace. UNITECR (2011) 2-B2-19. [10] Beimdiek K.; Klischat, H.-J.: Dry and wet gunning-technico-economica refractory concrete concepts for highly loaded cement plants. UNITECR (2013) 156–161. [11] Myhre, B.; Peng, H.: Microsilica-gel bond castables with potentials. Proc. 49th Symp. on Ref. Amer. Ceram. Soc (2015) 112–121. [12] EMMA (Elkem Materials – Mixture Analyzer) software, free download at:


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