1,720,989 research outputs found
Nuove modifiche alla legge sul procedimento amministrativo
No full textIl volume raccoglie saggi critici sulle recenti modifiche apportate dalla Riforma Madia della pubblica amministrazione alla legge sul procedimento amministrativo ed all'azione amministrativa in general
Utilizzo di materiali polimerici per la formulazione di leganti stradali con elevata resistenza ai carburanti
No full text
Linear viscoelastic behaviour of asphalt binders modified with polymer/clay nanocomposites
No full textAbstractThe present contribution focuses on asphalt modification with polymeric nanocomposites. Bitumen/polymer/clay ternary blends were prepared using linear SBS copolymer mixed with an organo-modified montmorillonite. Dynamic mechanical analyses (DMA) were performed in the extended domain of temperature and frequency to analyse the thermo-rheological behaviour of the blends. The mechanical response was found to be intimately influenced by the nanocomposite modification and a solid-like behaviour with no Newtonian transition appeared. Morphological analyses allowed to associate variations in material properties with the enhanced compatibility promoted by clay. Relations between the nanocomposite characteristics and the behaviour of the final binder were individuated and discussed
Kerosene resistance of asphalt binders modified with crumb rubber: solubility and rheological aspects
No full textDue to the abandonment of coal-tar, the development of special asphalt binders is required to obtain flexible pavement with enhanced fuel resistance for use in airport systems, filling stations and
industrial areas where the risk of fuel spilling exists.
Considering that recent studies showed that the
solubility of a bitumen in jet fuel A-1 can be
significantly reduced through its modification with an
appropriate polymer, the effect of crumb rubber
modifier (CRM) on the fuel resistance of bitumen was
investigated in this work. A simple procedure to
evaluate the solubility of bitumen in kerosene was
developed and used to compare the properties of CRM-based binders with those of the starting base bitumen. The obtained results showed that CRM significantly reduces the bitumen solubility in jet fuel
A-1 and that complex interactions, including swelling and kerosene absorption, occur. The rheological properties of fuel processed samples were then investigated in order to outline the effects of kerosene on the binder
Il mercato dei lavori pubblici come ordinamento giuridico
Full text linkUna riflessione sull'attualità della nozione di Ordinamento Giuridico a 100 anni dalla pubblicazione del volume di Santi Romano. In particolare si propone una lettura del mercato dei contratti pubblici come ordinamento giuridic
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