Use of Adhesion Promoters in Asphalt Mixtures Cihlářová, Denisa; Fencl, Ivan; Cápayová, Silvia ...
Slovak journal of civil engineering,
03/2018, Letnik:
26, Številka:
1
Journal Article
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The purpose of asphalt binder as a significant binder in road constructions is to permanently bind aggregates of different compositions and grain sizes. The asphalt binder itself does not have ...suitable adhesiveness, so after a period of time, bare grains can appear. This results in a gradual separation of the grains from an asphalt layer and the presence of potholes in a pavement. Adhesion promoters or adhesive agents are important and proven promoters in practice. They are substances mainly based on the fatty acids of polyamides which should increase the reliability of the asphalt’s binder adhesion to the aggregates, thus increasing the lifetime period of the asphalt mixture as well as its resistance to mechanical strain. The amount of a promoter or agent added to the asphalt mixture is negligible and constitutes about 0.3% of the asphalt’s binder weight. Nevertheless, even this quantity significantly increases the adhesive qualities of an asphalt binder. The article was created in cooperatation with the Slovak University of Technology, in Bratislava, Slovakia, and focuses on proving the new AD2 adhesive additive and comparing it with the Addibit and Wetfix BE promoters used on aggregates from the Skuteč - Litická and Bystřec quarries.
In the Czech Republic owning and utilising of a car is one of the best remedies against a diminishing of cruising radius in old age and a comfortable mean to sustain autonomy and independence of ...living as well as social relations. Physical handicaps and limits of the elderly could be compensated today by sophisticated technical solutions. Promotion of specialised driver-assistance systems in the cars and advancement of the demand for age relevant cars with high-tech-optimisation should be the remedy; It is expected that these technical means will be used to a far greater degree in the future for the purposes of preventing road accidents (active safety) and to reduce the impact of the road accidents that do occur (passive safety) to senior citizens. The use of telematic should help in preventing accidents. Technical development increasing the safety of vehicles for older passengers need not be the privilege of a few. It will be necessary to co-operate with manufacturers to ensure that technical innovations are available to all and attainable as soon as possible for a wide range of new vehicles. The possibilities for equipping older vehicles already on the roads with new technical means of prevention should also be investigated.
With changing attitudes and conditions the desire to travel for services, business and leisure represents a potential major new source of ideas for IVIS and ADAS designers and producers.
Senior drivers represent a potential major new source of ideas for IVIS and ADAS designers and producers. The telematic development including IVIS and ADAS designed to reduce traffic accidents and to support elderly drivers in a suitable and user-oriented way may be appropriate solution.
Maintaining the peace and security by regional arrangements in Africa (focusing on peace-keeping operations) Abstract The present thesis focuses on the issue of peace-keeping operations maintained by ...the regional and sub-regional organizations in Africa, namely African Union and ECOWAS. The main statement of the thesis is the following: The United Nations is unable to react effectively to threats to international peace and security, especially in cases of mass violations of human rights in intrastate conflicts, that have severe impact on particular region including refugee crisis or spreading the conflict to other states of the region. In the thesis, particular instruments of the above-mentioned international organizations, that create the framework for operations for maintaining peace and security in the region, are described. Attention is also paid to the relevant bodies of the African union and ECOWAS such as Peace and security council of the AU or African standby force. The thesis elaborates on problematic or controversial issues from international law perspective. In the first place, the concept of humanitarian intervention and related concept of responsibility to protect is underlined. It is demonstrated that African Union and ECOWAS have significant contribution to these concepts when implementing...
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