Emission Characteristics of VOCs during Asphalt Pavement Construction

2021 ◽  
Vol 1035 ◽  
pp. 999-1005
Author(s):  
Yin Huai Ma ◽  
Li Guo ◽  
Shao Peng Wu ◽  
Na Li ◽  
Jun Xie
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Critical Factor ◽  
Rolling Process ◽  
Field Investigation ◽  
Construction Technology ◽  
Pavement Temperature ◽  
Pavement Construction ◽  
Complex Organic ◽  
Vocs Emission

As the important part of expressway, the construction technology of asphalt pavement will contribute to the production of greenhouse gases and other volatile organic compounds (VOCs), which has a significant impact on the environment. In order to further analyze the composition, distribution and release of VOCs during asphalt pavement construction, the VOCs emission during paving and rolling were measured through field investigation and sampling. The results show that there are approximately 100 kinds of VOCs substances detected due to the complex organic component of asphalt binder, which is a critical factor to influence the VOCs emission during asphalt pavement construction. During the paving process, the largest VOCs release is 1015.05 ug/m3. With the increase of rolling times, the pavement temperature gradually decrease, and the VOCs emission drops to 266.73 ug/m3. The content of the 10 kinds of substances with the highest concentration accounts for more than 50% of the total VOCs content, in which the proportion of aliphatic hydrocarbons (ALH) and oxygenated hydrocarbon (O-HYD) of the paving process are the highest, while the proportion of aromatic hydrocarbons (ARH) is dominated in the rolling process. The results are vulnerable to the external environment, especially at lower emission level. The relevant research results have certain guiding significance for the control and treatment of harmful gas emission in the construction process of asphalt pavement.

Research on the Construction Technology of Self-Monitoring Asphalt Concrete

2021 ◽  
Vol 891 ◽  
pp. 205-210
Author(s):  
Yuan Xu
Keyword(s):  
Asphalt Concrete ◽  
Test Section ◽  
Rolling Process ◽  
Construction Technology ◽  
Self Monitoring ◽  
Mixing Effect ◽  
Steel Wheel ◽  
Mixing Method ◽  
Pavement Construction ◽  
Compaction Degree

Combined with the paving of the test section of Self-monitoring Asphalt Concrete, the electrode burying mode of pavement construction is designed according to its characteristics, and the best mixing method and spreading rolling construction technology are compared and analyzed. The results show that the construction structure of the test section is reasonable and feasible, the best mixing effect can be obtained by adding conductive phase material and asphalt at the same time, and the rolling process. The order of rubber wheel and steel wheel compaction has no significant effect on compaction degree.

Determining Optimum Carbon Nanotubes Content for Asphalt Mixture in Road Pavements

2021 ◽  
Vol 1023 ◽  
pp. 121-126
Author(s):  
Van Bach Le ◽  
Van Phuc Le
Keyword(s):  
Carbon Nanotubes ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Construction Cost ◽  
Asphalt Mixtures ◽  
Static Modulus ◽  
Pavement Construction ◽  
Modified Binder ◽  
Marshall Stability

Although small amount of binder in asphalt concrete mixture may commonly range from 3.5 to 5.5% of total mixture as per many international specifications, it has a significant impact on the total cost of pavement construction. Therefore, this paper investigated the effects of five carbon nanotubes contents of 0.05%, 0.1%, 0.15%, 0.2%, 0.25% by asphalt weight as an additive material for binder on performance characteristics of asphalt mixtures. Performance properties of CNTs modified asphalt mixtures were investigated through the Marshall stability (MS) test, indirect tensile (IDT) test, static modulus (SM) test, wheel tracking (WT) test. The results indicated that asphalt mixtures with CNT modified binder can improve both the rutting performance, IDT strength and marshall stability of tested asphalt mixtures significantly at higher percentages of carbon nanotubes. However, the issue that should be considered is the construction cost of asphalt pavement. Based on the asphalt pavement structural analysis and construction cost, it can be concluded that an optimum CNT content of 0.1% by asphalt weight may be used as additive for asphalt binder in asphalt mixtures.

Polyacrylate Modified Binder for Sustainable Asphalt Pavement Performances Using Superpave Mix Design

2015 ◽  
Vol 747 ◽  
pp. 238-241
Author(s):  
Wan Adilah Ismail ◽  
Intan Rohani Endut ◽  
Sit Zaharah Ishak
Keyword(s):  
Material Selection ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Binder Content ◽  
Mix Design ◽  
Asphalt Binders ◽  
Air Voids ◽  
Modified Asphalt ◽  
Modified Asphalt Binder ◽  
Pavement Construction

Sustainable asphalt pavement is important in decreasing material costs by improving the existing material such as modified asphalt binders. It is also needed to provide a quality riding for road users. In achieving quality riding, the material selection and mix design must be correctly examined before using in pavement construction. Then, the aims of this study are to determine suitability of material selected by examining the aggregate properties and modified asphalt binder. In modified asphalt binder, 6% of polyacrylate polymer was added as an additive in 500g of binder content to dissolve. It was checked through Superpave gyratory compactor in determining air voids samples in term of height after compacted. The samples were mixed with different percentages of binder content; 5%, 5.5%, 6% and 6.5% to produce control and polyacrylate modified samples. 8 gyratory for Ninitialand 100 gyratory for Ndesignwere used in compaction of samples to determine air voids in term of height. The results show that 5.5% of binder content of polyacrylate modified samples has lower air voids compare than control samples. Thus, modified binders are able to minimize binder usage and save natural sources and also cost by improving bonding between mixtures to prevent pavement failure

A review on rejuvenating materials used with reclaimed hot mix asphalt

2020 ◽  
Author(s):  
Zaid Hazim Al Saffar ◽  
Haryati Yaacob ◽  
Mohd Khairul Idham ◽  
Mhmood Khleel Saleem ◽  
JAU CHOY LAI ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Reclaimed Asphalt Pavement ◽  
Construction Technology ◽  
Reclaimed Asphalt ◽  
Aged Asphalt ◽  
Future Challenges ◽  
Materials Used ◽  
Pavement Construction ◽  
Optimal Approach ◽  
Pavement Service Life

In recent years, flexible pavement construction technology has relied heavily on the use of reclaimed asphalt pavement (RAP). However, the brittle nature of RAP, which stems from the use of an aged asphalt, has introduced numerous complexities into the process, with important implications to pavement service life. The properties of the aged asphalt can be rejuvenated to improve the performance and the behavior of RAP mixtures. This paper presents a review of past works that have used rejuvenating materials with RAP, including their benefits and drawbacks, as well as the optimal approach to increase RAP content in asphaltic mixtures. The method of rejuvenating aged asphalt and the mechanism of rejuvenation are also reviewed. The findings of this review can be used to predict the current and future challenges in the regeneration of RAP mixtures using rejuvenating materials.

scholarly journals An Improved Low-Cost Continuous Compaction Detection Method for the Construction of Asphalt Pavement

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Tong Jia ◽  
Tiejun He ◽  
Zhendong Qian ◽  
Jian Lv ◽  
Kaixin Cao
Keyword(s):  
Detection Method ◽  
Detection System ◽  
Asphalt Pavement ◽  
Low Cost ◽  
Rolling Process ◽  
Continuous Compaction Control ◽  
Positioning Method ◽  
Compaction Control ◽  
Pavement Construction ◽  
Compaction Degree

To realize the continuous compaction control (CCC) of asphalt pavement during construction, continuous detection method was investigated for the compaction degree values. For the trajectory of rollers, a collaborative positioning method was proposed. For the monitoring of rolling process, an embedded-based detection system was designed. For the evaluation of rolling effect, harmonic analysis was introduced and a new index, vibration compaction energy value (VCVe), was proposed. Positioning experiments were conducted, and the accuracy was improved to 0.48 m. Rolling tests were performed, and typical compaction meter values (CMVs), compaction control values (CCVs), and VCVe were obtained. The referenced compaction degree by conventional way was 94.6%, which was used to calibrate the detected values of compaction degree indexes. The results showed that continuous compaction detection can be achieved based on positioning system and vibration analysis. Compared with CMV and CCV, VCVe is less discrete, more stable, and consistent to describe the compaction state. Though, all the CMV, CCV, and VCVe indexes are unable to be used for quality assurance directly or alone, they could be an aid for quality control. Continuous compaction detection system meets the monitoring requirements of pavement construction at a lower cost and could lay a foundation for the intelligent compaction (IC).

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