Mechanical, durability and hydrothermal properties of concrete produced using Portland cement-ceramic powder blends

článek v časopise ve Web of Science, Jimp

angličtina

Blended Portland cement-ceramic powder binder containing up to 60% of fine-ground waste ceramics from a brick factory is used in concrete mix design, as an environmental-friendly alternative to the commonly used Portland cement. The experimental analysis of basic physical characteristics, mechanical and fracture-mechanical properties, durability properties and hygrothermal characteristics shows that the optimal amount of ceramic powder in the mix is 20% of the mass of blended cement. The decisive parameters in that respect are the compressive strength, liquid water transport parameters and resistance against deicing salts which are not satisfactory for higher ceramics dosage in the blends. In the case of other studied parameters, the limits for the effective use of ceramic powder are higher, 40% for the effective fracture toughness and specific fracture energy, 60% for the frost resistance and chemical resistance to MgCl2, NH4Cl, Na2SO4, HCl and CO2. The water vapor diffusion coefficient is found to increase with the increasing content of ceramics which for wet envelopes can be considered as a positive feature but for dry envelopes it may have a negative effect. The thermal conductivity of all mixes increases fast with growing moisture content; up to 50% differences between the dry- and water-saturated-state values are observed. This has to be taken into account in energy-related calculations.

cement,brick body, concrete, mechanical properties, fracture properties, hygric properties, thermal properties, corrosin resistance

Kulovaná, T., Vejmelková, E., Keppert, M., Rovnaníková, P., Keršner, Z. and Černý, R.

1. 3. 2016

fib - Intrnational Federation for Structural Concrete

Berlin Germany

1464-4177

Structural Concrete

17

1

Spolková republika Německo

105

115

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