Autor: Więckowski, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Differentiated road construction costs
Autorzy:: Więckowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/952125.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: road costs
motorway
express road
tunnel
koszty drogowe
autostrada
droga ekspresowa
tunel
Opis:: In the context of the variability of road construction costs in Europe, the prices of 24 contracts for sections of motorways in Poland, concluded in 2016 by the General Directorate for National Roads and Motorways, were analysed. According to the proposed method of calculation, taking into account the fact that road prices in tunnels were several times higher than in other sections, the unit cost of the road in a tunnel (between Naprawa and Skomielna Biała) was assessed, compared to the road in a tunnel in Slovenia. Based on the study of the values of standard deviations and coefficients of variation, it can be stated that there is a small price differentiation in S-class roads on flat and corrugated areas, and very large price differentials on the roads that bypass cities and in mountainous terrain.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 96; 205-213
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Automating the construction of bus bays with reinforced concrete
Autorzy:: Więckowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/196486.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: automation
CSA cement
bus bays
automatyzacja
Cement CSA
zatoki autobusowe
Opis:: When renovating intensively used bus bays, roads and squares, the need for their periodical closure to traffic during the period of works is inconvenient. In the case of concrete surface repairs, this timeline is additionally elongated due to the standard requirement of a 28-day curing period. The Department of Geomechanics, Civil Engineering and Geotechnics of the AGH University of Science and Technology has investigated the prototype RoadTronic robot to make slabs reinforced with a mesh of glass fibre rods. Process automation permits the application of rapid-setting CSA-based (calcium sulphoaluminate-based) cements, which achieve a compressive strength of over 20 MPa after just 1.5 h. The good properties of such cement have been confirmed by several years of use on the runway at Seattle-Tacoma Airport. Preliminary tests of the early compressive strength of Rapid Set® CSA-based concrete performed at the department, as well as calculations of guaranteed strength, indicate that young concrete can transmit operational load after just 4 h from mixing with water. The investigated solution assures a complete slab following one passage of the robot. This would permit the removal of the existing layer during reduced vehicle traffic, e.g., between 06:00 and 22:00, and the execution of a new abrasive concrete layer by 02:00, so as to restore regular traffic at 06:00.
Źródło:: Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 100; 203-210
0209-3324
2450-1549
Pojawia się w:: Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:: Biblioteka Nauki

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