نتایج جستجو برای: polymer modified bitumen
تعداد نتایج: 340821 فیلتر نتایج به سال:
INTRODUCTION An industrial hygiene database has been constructed for the exposure assessment in a study of cancer risk among asphalt workers. AIM To create models of bitumen and polycyclic aromatic hydrocarbons (PAH) exposure intensity among paving workers. METHODS Individual exposure measurements from pavers (N = 1581) were collected from 8 countries. Correlation patterns between exposure ...
BACKGROUND We conducted a nested case-control study in a cohort of European asphalt workers in which an increase in lung cancer risk has been reported among workers exposed to airborne bitumen fume, although potential bias and confounding were not fully addressed. OBJECTIVE We investigated the contribution of exposure to bitumen, other occupational agents, and tobacco smoking to the risk of l...
The present research aims to conduct laboratory assessment on fatigue phenomenon in warm mix asphalt modified with nano-silica and including reclaimed asphalt pavement materials by the aid of review on self-healing behavior and measurement of validity of laboratory results by modeling via neural artificial network in neutral network of SPSS software. For this purpose, 2% weight of sasobit and 3...
From the pavement construction emission perspective, bitumen emulsion is considered more environment-friendly than conventional because of its much lower temperature. However, faces major concern low mechanical strength especially at high service temperatures. To improve performance emulsion, waterborne epoxy resin can be used as a modifier. Nevertheless, there still lacks fundamental understan...
InfraRed spectrometry is a powerful technique to characterise bituminous binders. The methodology not fully harmonised and may lead variability. RILEM-272-PIM-TG1, evaluated seven complex bituminous, for which eleven laboratories performed FTIR. While, the spectra showed similar trends, further analysis was needed improve comparison. A specific approach applied on two binders, unmodified polyme...
A new interpretive algorithm has been developed for bitumen spectra analysis in tar sands. This algorithm utilizes Low Field NMR method for measurements. With the use of appropriate basic components spectra database the algorithm extracts information on bitumen contents, immovable and movable water saturations. The basic components spectra database can be built by analysis of spectra for simila...
Assessment of DNA damage in WBCs of workers occupationally exposed to fumes and aerosols of bitumen.
We conducted a cross-shift study with 66 bitumen-exposed mastic asphalt workers and 49 construction workers without exposure to bitumen. Exposure was assessed using personal monitoring of airborne bitumen exposure, urinary 1-hydroxypyrene (1-OHP), and the sum of 1-, 2 + 9-,3-,4-hydroxyphenanthrene (OHPH). Genotoxic effects in WBC were determined with nonspecific DNA adduct levels of 8-oxo-7,8-d...
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