Residual Properties of Fiber-Reinforced Refractory Composites With a Fireclay Filler

Abstract

Abstract. The aim of our study was to develop a composite material for industrial use that is resistant to the effect of high temperatures. The binder system based on aluminous cement was modified by adding finely-ground ceramic powder and metakaolin to reduce costs and also to reduce adverse effects on the environment due to high energy consumption for cement production. Additives were applied as a partial aluminous cement replacement in doses of 10, 20 and 30 % by weight. The composites were evaluated on the basis of their mechanical properties and their bulk density after gradual temperature loading. The influence of basalt fibers and modifications to the binder system were studied at the same time. Basalt fibers were applied in doses of 0.5 % and 2.0 % by volume. The results confirmed the potential of the mineral additives studied here for practical applications, taking into account the residual mechanical parameters after thermal loading. The addition of ceramic powder reduced the bulk density by 5 % for each 10 % of cement substitution, but the residual values were very similar. The bulk density and the compressive strength were reduced when basalt fibers were applied, and the flexural strength was significantly increased in proportion to the fiber dosages. Metakaolin seems to be a more suitable additive than the ceramic powder that was applied here, because there was a significant increase in the mechanical parameters and also in the residual values of all properties that were studied.

Application of hybrid cement in passive fire protection of steel structures

“…Mortar with H-cement and fireclay sand was subjected to mixability tests according to a modified recipe based on knowledge from the development of refractory concretes (Jogl et al ., 2016a, b). The modified mixture for the use of H-cement is presented in Table 3.…”

“…The possibility of using alternative cements and different variations of dispersed reinforcement was investigated in research conducted by Jogl et al . (2016a, b), where the use of fireclay sand or other insulating fillers was investigated for the development of refractory concrete. Factors that affect the workability of the mixes were investigated in terms of the volume of water required to mix with the insulating fillers or cements used.…”

Response of Refractory Cement Based Composite to Gradual Temperature Loading

“…Granite has the opposite problem, shrinkage of volume due elevated temperatures. Alternativelly could be used artificial aggregates for application up to 700°C (usually chamotte fireclay, bauxite, chromite, corundum, carborundum, slag, and electro-porcelain) [15]. The main filler of investigated cement composite was a combination of two fractions (0/4 mm and 2/5 mm) of natural crushed basalt aggregated, also used in [13].…”

Mechanical Properties of Refractory Composites with Granulated Ceramic Fibers

“…Nevertheless, fireclay refractories are still the most widely used type, due to their ease of fabrication, resistance to chemical attack, and relatively low cost [Andrews et al 2013;Jogl et al 2016]. Liaver.…”

“…For this reason, Portland cement-based composites and concretes are not suitable for high temperature applications. An indispensable component is aluminous cement, which exhibits excellent resistance to high temperature [Jogl et al 2016].…”