Fracture characteristics of refractory composites containing metakaolin and ceramic fibers

Holčapek, Ondřej; Reiterman, Pavel; Konvalinka, Petr

doi:10.1177/1687814015573619

Cited by 24 publications

(30 citation statements)

References 26 publications

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“…In addition to the environmental benefit provided on using these by-products, SCM can significantly improve the quality of the concrete [22][23][24][25]. Such replacement influences properties of fresh as well as hardened concrete [26].…”

Section: Introductionmentioning

confidence: 99%

Wet-Treated MSWI Fly Ash Used as Supplementary Cementitious Material

Keppert

Siddique

Pavlík

et al. 2015

Advances in Materials Science and Engineering

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Municipal solid waste incineration (MSWI) is a common technique in treatment of domestic waste. This technique annually produces approximately 25 Mt solid residues (i.e., bottom and fly ash) worldwide which is also a major issue in current research. In this research we are concerned with reusing the fly ash (FA) as supplementary cementitious material (SCM) in concrete. Such application solves the problem with heavy metal immobilization as well. To remove the high content of undesired soluble salts, number of washing treatments has been applied. Chemical composition of FA has been examined before and after treatments. The impact of cement substitution by FA in concrete was evaluated by measurement of its compressive strength and durability.

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Section: Introductionmentioning

confidence: 99%

Wet-Treated MSWI Fly Ash Used as Supplementary Cementitious Material

Keppert

Siddique

Pavlík

et al. 2015

Advances in Materials Science and Engineering

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“…Previous research had confirmed a positive impact of dosing fibres of different lengths [26]. To achieve better fracture properties and to limit crack initiation, it is more effective to use longer fibres.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2016

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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.

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“…Non-destructive methods find their significant role in civil engineering, material science, diagnostics of structures, and descriptions of gradual changes in materials due to temperature, moisture and dynamic loading [14,15,16]. A Proceq PunditLab+ ultrasonic velocity test instrument has been used to determine ultrasound speed vL by 54 kHz pulse transducer.…”

Section: Dynamic Modulus Of Elasticitymentioning

confidence: 99%

Analysis of Mechanical Properties of Hydrothermally Cured High Strength Cement Matrix for Textile Reinforced Concrete

2015

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Abstract. The main objective of this article is to describe the influence of hydrothermal curing conditions in an autoclave device (different pressure and temperature), which took place at various ages of a fresh mixture (cement matrix -CM, and fibre-reinforced cement matrix -FRCM), on textile reinforced concrete production. The positive influence of autoclaving has been evaluated through the results of physical and mechanical testing -compressive strength, flexural strength, bulk density and dynamic modulus of elasticity, which have been measured on specimens with the following dimensions: 40 × 40 × 160 mm 3 . In addition, it has been found that increasing the pressure and temperature resulted in higher values of measured characteristics. The results indicate that the most suitable surrounding conditions are 0.6 MPa, and 165°C at the age of 21 hours; the final compressive strength of cement matrix is 134.3 MPa and its flexural strength is 25.9 MPa (standard cured samples achieve 114.6 MPa and 15.7 MPa). Hydrothermal curing is even more effective for cement matrix reinforced by steel fibres (for example, the compressive strength can reach 177.5 MPa, while laboratory-cured samples achieve a compressive strength of 108.5 MPa).

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Fracture characteristics of refractory composites containing metakaolin and ceramic fibers

Cited by 24 publications

References 26 publications

Wet-Treated MSWI Fly Ash Used as Supplementary Cementitious Material

Wet-Treated MSWI Fly Ash Used as Supplementary Cementitious Material

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

Analysis of Mechanical Properties of Hydrothermally Cured High Strength Cement Matrix for Textile Reinforced Concrete

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