|
Title
|
|
|
|
The use of geopolymers to reduce volatile organic compounds emission from crumb rubber modified bitumen
| |
|
Author
|
|
|
|
| |
|
Abstract
|
|
|
|
| Modifying bitumen for road construction using crumb rubber (CR) from end-of- life tires has potential in European countries due to government support for recycling this material. However, the addition of CR can increase the volatile organic compounds (VOC) emission during pavement construction, which can cause harmful health effects on workers due to their toxic and carcinogenic properties. Previous studies have shown that CR modification contributes to the total VOC emission, especially xylene, benzothiazole, and toluene. Therefore, it is essential to not only identify VOC emissions but also to find ways to reduce them. The present study reports the experimental results of the inhibition effect of geopolymer additives incorporated in crumb rubber modified bitumen (CRMB) to produce a more environmentally friendly binder. Two geopolymers were used: one with metakaolin and another with blast furnace slag, both activated with a solution of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). A commercial B50/70 unmodified bitumen was used as a reference and base binder for the modification with CR. The CRMB was prepared by blending the base bitumen with CR and two types of geopolymers for 60 minutes. The ratio used was 15% of CR by mass of bitumen and 5% of geopolymer by mass of blend. A Proton-transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS) was used to identify and compare the VOC emission profile of different modified bituminous binders. According to the PTR-TOF-MS test results, the addition of the geopolymers reduced the VOC emission. Results also confirmed that temperature is a highly influential factor in VOC emission. |
| |
|
Language
|
|
|
|
English
| |
|
Source (book)
|
|
|
|
Proceedings of the Rubberized Asphalt • Asphalt Rubber 2022 Conference, 27-29 June, 2022, Malaga, Spain
| |
|
Publication
|
|
|
|
Portugal
:
2022
| |
|
ISBN
|
|
|
|
978-989-53684-0-2
| |
|