الفهرس 
Aim of studyOnly 14 pages are availabe for public view
 |  | from | 136 |  |  |
| | | from | 136 | | |
Abstract
Hot mix asphalt (HMA) is a major construction material used for building roads, airport runways, and parking lots. During HMA construction, a massive amount of volatile organic compounds (VOCs) is emitted from the hot asphalt mixtures, creating a potential health risk to on-site workers. Few studies have quantitatively investigated the constituents and potential health effects of the VOCs generated in HMA pavement construction. This paper presents the results of a study in which air samples were collected at multiple locations and time points of several projects during HMA pavement construction and were subsequently characterized for their chemical compositions and concentrations by using gas analyzer Although the individual concentrations of the identified chemicals were found to be below various exposure limits, their collective effect on human health remains unknown and may not be ignored. This paper contributes to the knowledge of the concentrations of VOCs generated in asphalt pavement construction which of potential health risks to workers, and possible mitigation measures.
The measured VOCs shows a significant increase of VOC (minimum, maximum, mean and St deviation level)from 115, 169, 141.2 and 14.709 ppb respectively to 1753, 1895, 1832.73 and 27.235 ppb respectively after asphalt pavement in Maryoutia St with p-value <0.0001 and a significant increase of VOC (minimum, maximum, mean and St deviation level) from 156, 225, 193.7 and 21.324 ppb respectively to 1985, 2315, 2209.47 and 103.343 ppb respectively after asphalt pavement in El Zomor St with p-value <0.0001 which indicate an extremely statistically significant increase of VOC due to asphalt pavement. By conventional criteria, this difference in Maryotia St and El Zomor St is considered to be statistically significant.
The measured VOCs shows a significant increase of VOC (minimum, maximum, mean and St deviation level)from 143, 169, 155.2 and 7.151 ppb respectively to 1730, 1895, 1825.8 and 34.745 ppb respectively after asphalt pavement in El Orouba St with p-value <0.0001 and a significant increase of VOC (minimum, maximum, mean and St deviation level) from 115, 138, 127.5 and 6.01 ppb respectively to 1550, 1680, 1621.47 and 34.247 ppb respectively after asphalt pavement in Feisal St with p-value <0.0001 which indicate an extremely statistically significant increase of VOC due to asphalt pavement.
Comparative study between the measured VOCs in El Zomor asphalt pavement project before and after asphalt pavement which have been carried out in summer with relatively high temperature and Feisal asphalt pavement project before and after asphalt pavement which have been carried out in winter with relatively low temperature. An increase of VOC (minimum, maximum, mean and St deviation level) before asphalt pavement in El Zomor 156, 225, 193.7 and 21.324 than before asphalt pavement in Feisal 115, 138, 127.5 and 6.01 before asphalt with p-value <0.0001.
An increase of VOC (minimum, maximum, mean and St deviation level) after asphalt pavement in El Zomor 1985, 2315, 2209.47 and 103.343 than after asphalt pavement in Feisal 1550, 1680, 1621.47 and 34.247 after asphalt with p-value <0.0001.
By conventional criteria, this difference is considered to be extremely statistically significant increase in VOCs level due to seasonal temperature increase from winter (Feisal pavement project) to summer (El Zomor pavement project).
Statistical study of the increase in VOCs level during 30 min readings is shown.
An increase of CO (minimum, maximum, mean and St deviation level) before asphalt pavement in Feisal (1.56, 1.99, 1.83 and 0.1) than before asphalt pavement in Feisal (1.13, 1.76, 1.51 and 0.14) before asphalt with p-value <0.0001.
By conventional criteria, this difference is considered to be extremely statistically significant increase in CO level due to pavement of asphalt.
An increase of H2S (minimum, maximum, mean and St deviation level) before asphalt pavement in Feisal(5.5,9. 1,7.9 and 0.652) than before asphalt pavement in Feisal(3.5,6.8,4.54 and 0.415) before asphalt with p-value <0.0001.
By conventional criteria, this difference is considered to be extremely statistically significant increase in H2S level due to pavement of asphalt.
An increase of NO2 (minimum, maximum, mean and St deviation level) before asphalt pavement in Feisal (150,180,165 and 12) than before asphalt pavement in Feisal (77, 130,93 and 9) before asphalt with p-value <0.0001.
By conventional criteria, this difference is considered to be extremely statistically significant increase in NO2 level due to pavement of asphalt.
An increase of SO2 (minimum, maximum, mean and St deviation level) before asphalt pavement in Feisal (159, 193, 180.5 and 9) than before asphalt pavement in Feisal (71,112,0.882 and 0.1) before asphalt with p-value <0.0001.
By conventional criteria, this difference is considered to be extremely statistically significant increase in SO2 level due to pavement of asphalt.
By conventional criteria, this difference is considered to be extremely statistically significant increase in VOCs, CO, SO2, H2S and NO2 levels due to pavement of asphalt.