Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures

Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures

Článek WoS

This paper presents new results of the research of the influence of individual input components done on the behaviour of cement based composite materials exposed to high temperatures. A new approach of this research lies in combining a fraction of basalt fine aggregate and an aggregate base on expanded clay for a composite material with lower volume weight and higher strengths and a resistance to high temperatures. In the field of dispersed reinforcement, new polypropylene fibers treated by low temperature plasma were tested. Degradation of the structure of designed mixtures was evaluated by comparing density changes, mechanical and acoustic properties before and after exposure to high temperatures. An optical microscope was used for determining the width of cracks caused by a thermal load. The contribution of this research was the use of non-destructive methods for diagnostics of quality and properties of designed concrete mixtures exposed to high temperatures.

This paper presents new results of the research of the influence of individual input components done on the behaviour of cement based composite materials exposed to high temperatures. A new approach of this research lies in combining a fraction of basalt fine aggregate and an aggregate base on expanded clay for a composite material with lower volume weight and higher strengths and a resistance to high temperatures. In the field of dispersed reinforcement, new polypropylene fibers treated by low temperature plasma were tested. Degradation of the structure of designed mixtures was evaluated by comparing density changes, mechanical and acoustic properties before and after exposure to high temperatures. An optical microscope was used for determining the width of cracks caused by a thermal load. The contribution of this research was the use of non-destructive methods for diagnostics of quality and properties of designed concrete mixtures exposed to high temperatures.

cement, high temperature, fire resistance, fibers, volumetric change,; mechanical properties, propagation of ultrasonic waves, modulus of elasticity, concrete

cement, high temperature, fire resistance, fibers, volumetric change,; mechanical properties, propagation of ultrasonic waves, modulus of elasticity, concrete

BODNÁROVÁ, L.; HROUDOVÁ, J.; BROŽOVSKÝ, J.; ZACH, J.; VÁLEK, J.

2018

24.03.2017

Budapest University of Technology and Economics

0553-6626

Periodica Polytechnica-Civil Engineering

61

2 (2017)

Maďarsko

272

281

10

https://pp.bme.hu/ci/article/view/9365

http://hdl.handle.net/11012/68897

PPci.9365