National Repository of Grey Literature 63 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
The influence of cold RAP addition on the resulting temperature of the asphalt mixture
Bocák, Tomáš ; Hýzl, Petr (referee) ; Dašek, Ondřej (advisor)
The aim of the bachelor thesis is to simulate the effect of dosing cold reclaimed asphalt into a hot aggregate mixture, under laboratory conditions. The theoretical part will describe the possibilities of reclaimed asphalt dosing in the production of asphalt mix, together with the principles for the design of a new asphalt mix. In the practical part, by my proposed procedure, the cold portion of aggregate will be mixed with the hot portion of aggregate. The measurements will result in the final aggregate mixture temperatures and their comparison.
Evaluation of properties of asphalt binder from waste materials containing bitumen
Košťálová, Aneta ; Hegr, Zdeněk (referee) ; Dašek, Ondřej (advisor)
The bachelor's thesis deals with the comparison of the properties of two types of asphalt binders obtained from waste materials. The theoretical part contains the properties of bitumen waterproofing sheet and asphalt shingles. In the following practical part, tests of asphalt binders on individual samples are described and then carried out. These include tests to determine needle penetration, softening point by the Ring and Ball method, determination of the elastic recovery and determination of rheological properties by DSR. Finally, the results are evaluated, summarized and compared with each other.
Coarse-grained asphalt mixtures
Rimel, Jindřich ; Dašek, Ondřej (referee) ; Hýzl, Petr (advisor)
The diploma thesis investigates the properties of coarse-grained asphalt mixtures ACP 32, which are compared with the properties of ACP 22 mixtures. The theoretical part deals with the composition of asphalt mixtures, their production, transport and laying. Experience with using coarse-grained mixtures around the world is also presented. The practical part deals with mixture design, production and testing to assess the properties of the mixtures. The tests selected for the comparison of the properties are wheel tracking, TSRST and stiffness by a two-point bending test.
Influence of virgin bitumen on the properties of polymer modified bitumens
Kamanová, Monika ; Koudelka, Tomáš (referee) ; Dašek, Ondřej (advisor)
The diploma thesis describes the influence of the used input paving bitumen on the properties of the produced polymer modified bitumen. The theoretical part explains parameters of asphalt binders and improving their properties after using modifying additives. The second part is explaining methods and test results. The empirical tests (needle penetration, softening point, breaking point) and performance tests in dynamic shear rheometer and bending beam rheometer are used for comparison of binders properties. In the conclusion the laboratory aging of asphalt binders is described by RTFOT and RTFOT+PAV method.
Mastic Asphalts
Škorík, Michal ; Dašek, Ondřej (referee) ; Hýzl, Petr (advisor)
This bachelor‘s thesis aims to closely showcase the knowledge of mastic asphalt. The theoretical part describes history, consistency of the mixture, production process and technique of application including the newest trends. The practical part includes the assessment of bulk density altogether with the functional tests of stiffness modulus and the resistance to low temperatures for the sample of mastic asphalt with polymer modified asphalt.
Cold asphalt mixtures
Spáčil, Petr ; Hýzl, Petr (referee) ; Dašek, Ondřej (advisor)
The bachelor thesis is divided into theoretical and practical part. The theoretical part consists of explanation of the problem. The thesis includes definitions as Bitumen, Asphalt Mixture, Asphalt Binder, Cut-back Bitumen and Viscosity. The practical part is focused mainly on the description of the test methods used on Asphalt Binders and Mixtures which were intended for repairs. It describes differences between used Asphalt Binders and explains and describes other used materials. The practical part compares the mixtures of different Cut-back Bitumen. It describes the production process and project of Cut-back bitumen mixture, the production process of individual test solids and compares the differences with hot made asphalt mixture. It also describes the analysis of volumetric, mechanical-physical and funcional tests in purpose of evaluating the differences between standard Cut-back Bitumen and new biofluxed asphalt binder.
Recycling of asphalt mixtures for low-traffic roads
Musil, Lukáš ; Dašek, Ondřej (referee) ; Varaus, Michal (advisor)
This bachelor's thesis deals with 100% pure recycling by method of hot mix asphalt recycling using a rejuvenating additive (so-called rejuvenator) for the device development in cooperation with an external company. The aim of bachelor's thesis is to determine the amount of dosing of the rejuvenator and to determine the compaction temperature for the processing the asphalt mixture. On the basis of determining the properties of the reclaimed asphalt pavement, by means of tests in the laboratory. According to the determined properties of the reclaimed asphalt pavement, the percentage of rejuvenator required to achieve the required properties of the asphalt mixture for subsequent processing and laying on the road.
Coarse graded asphalt mixtures
Mucha, Ondřej ; Dašek, Ondřej (referee) ; Hýzl, Petr (advisor)
The bachelor’s thesis is focused on asphalt mixtures that contain coarser aggregates than currently allowed by technical regulations in the Czech Republic. The introductory part of the work describes the composition of asphalt mixtures, their division and use. Further deals with foreign experience with these types of asphalt mixtures and their use in the surrounding European countries and in the United States of America. The aim of this work is to obtain a theoretical overview of knowledge about coarse graded asphalt mixtures from foreign sources and research.
Influence of temperature on the penetration of asphalt binders
Koblížek, Ondřej ; Koudelka,, Tomáš (referee) ; Dašek, Ondřej (advisor)
The bachelor thesis deals with an influence of temperature on the needle penetration results of tested bitumens in various test temperatures. The theoretical part describes the issue of laboratory tests in the world. This work also describes the american research program called SHRP (American Highway Research Program). The following part explains used test methods in detail (determination of needle penetration, determination of the softening point – ring and ball method). The practical part briefly introduces used materials and determines the results of laboratory tests and their comparison.
Use of an additive suitable for additional modification of the asphalt mixture
Machová, Sára ; Hegr, Zdeněk (referee) ; Dašek, Ondřej (advisor)
This thesis deals with the modification of asphalt binder 50/70 with fast reacting SBS. This is a relatively new additive that should be able to improve the binder properties during mixing of the asphalt mix at the plant. In the theoretical part, the issue of asphalt-mixing plant and polymer modification additives is presented. Furthermore, the test methods used such as needle penetration, softening point, determination of the elastic recovery, DSR and MSCR are described. Several modified binder samples were developed for the tests, in which mixing temperature, mixing time and SBS content were combined. The results of each test were compared and evaluated at the end of the thesis.

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