Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Jan Trejbal"'
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 40 (2023)
The effect of atmospheric and low-pressure plasma modification on polypropylene (PP) microfibers was examined. Mechanical changes on the microfiber surfaces were observed using scanning electron microscopy (SEM). Next, wettability was measured using
Externí odkaz:
https://doaj.org/article/72f72fe7c35843eb9ffb07e7ca05fcb3
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 34, Pp 6-10 (2022)
Mineral wool is one of the most commonly used types of thermal insulation in the European Union at the present, however, it generates massive amounts of waste. From an environmental standpoint, recycling or reuse of insulation materials seems to be a
Externí odkaz:
https://doaj.org/article/552ca6309f294695aa4535af2ff69fee
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 34, Pp 11-14 (2022)
The surface treatment of polypropylene microfibers by plasma processing in oxygen and argon was studied with the motivation to increase their cohesion with the cement matrix. By plasma treatment, it is possible to modify the surface of the microfiber
Externí odkaz:
https://doaj.org/article/8a3f2bfc95f944f8837d0e98490ef2a1
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 30, Pp 7-11 (2021)
The article deals with the optimalization of composition for reinforced lightweight cement composite containing micronized recycled concrete, which will be used to produce masonry blocks. The composite material is reinforced with polypropylene microf
Externí odkaz:
https://doaj.org/article/c92d76a62e294cfcbc1d8de4af571616
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 34, Pp 122–126-122–126 (2022)
It has become increasingly clear, that the recent consumption of mineral resources is unsustainable. The Czech Republic produces more than 217,000 tones of mineral wool annually, while its recycling stays unacceptably limited. This paper presents new
Externí odkaz:
https://doaj.org/article/691baa2443784da8b9611ee191528d6c
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 26, Iss 0, Pp 112-116 (2020)
Asphalt mixtures often fail due to poor interaction between mineral aggregate and bituminous binder. Therefore, many efforts are being made on adhesion improvement between the two materials. In this work, paving grade bitumen 50/70 was doped with two
Externí odkaz:
https://doaj.org/article/d1d28adb345949ed92577ff5f71e75d7
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 22, Iss 0, Pp 88-93 (2019)
This paper deals with the use of high-speed milling process for recycling old concrete and direct determination of the potential of input waste. For this purpose, three different types of waste concrete were used: prefabricated railway sleeper, struc
Externí odkaz:
https://doaj.org/article/ecf840f6094f4b4ab7fbab7bd260e0aa
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 22, Iss 0, Pp 123-127 (2019)
Fiber reinforced concrete mechanical properties are limited due to low adhesion between polymer fibers and cement matrix. To ensure a strong interaction between the two materials, polypropylene fibers (d = 0.305mm) were modified by an oxygen plasma t
Externí odkaz:
https://doaj.org/article/58daaefe97cb484e896ec9097e6c0f74
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 21, Iss 0, Pp 1-4 (2019)
The article describes plasma modifications of the surface of polyvinyl alcohol (PVA) microfibers using oxygen and hydrogen plasma in order to improve the properties of the composite material containing modified microfibers, cement and recyclate. Five
Externí odkaz:
https://doaj.org/article/3aa3f547543345c688f8f6165c56ba3f
Publikováno v:
Acta Polytechnica CTU Proceedings, Vol 21, Iss 0, Pp 38-41 (2019)
Asphalt mixtures often fail due to a low adhesion of bituminous binder to mineral aggregate, which leads to surface coarse damages like potholes and fatigue cracking. To avoid this phenomenon, different types of adhesion promoters may be admixed into
Externí odkaz:
https://doaj.org/article/7415e4c26b954c29bc2ce2a254187447