scholarly journals Sintered Calcined Clay as an Alternative Coarse Aggregate for Asphalt Pavement Construction

2015 ◽  
Vol 05 (03) ◽  
pp. 281-288 ◽  
Author(s):  
Cleudinei Lopes da Silva ◽  
Hidembergue Ordozgoith da Frota ◽  
Consuelo Alves da Frota
Keyword(s):  
Coarse Aggregate ◽  
Asphalt Pavement ◽  
Calcined Clay ◽  
Pavement Construction

scholarly journals Effects of Coarse Aggregate Shape and Texture on Engineering Properties of Roller Compacted Concrete Prepared for High Traffic Routes

2021 ◽  
Vol 10 (1) ◽  
pp. 88-107
Author(s):  
Alban Chidiebere Ogbonna
Keyword(s):  
Laboratory Testing ◽  
Coarse Aggregate ◽  
State Of The Art ◽  
Asphalt Pavement ◽  
Aggregate Size ◽  
Engineering Properties ◽  
Roller Compacted Concrete ◽  
Concrete Mix ◽  
Pavement Construction ◽  
Aggregate Shape

Abstract Use of roller-compacted concrete in pavement construction is increasing. Roller compacted concrete is a zero-slump, highly compacted concrete that is placed by equipment similar to that used in asphalt pavement construction. This investigation was conducted to collect the state-of-the-art information on effects of coarse aggregate size and texture on the strength and workability of roller-compacted concrete (RCC) for pavement construction and maintenance. Concrete specimens containing cubical and rough coarse aggregate, irregular and rough coarse aggregate, angular and rough coarse aggregate, rounded/spherical and smooth coarse aggregate, and flaky/elongated and rough coarse aggregate were prepared at 1:3:3 concrete mix ratio and 0.4 water cement ratio. Laboratory testing of specimens derived from the concrete specimens showed excellent results for cubical and rough coarse aggregate, irregular and rough coarse aggregate, and angular and rough coarse aggregate. Specimens from the rounded/spherical and smooth coarse aggregate, and flaky/elongated and rough coarse aggregate performed poorly in laboratory. The study therefore recommends the use of cubical and rough coarse aggregate, and irregular and rough coarse aggregate in the production of roller-compacted concrete for pavement construction and maintenance.

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.

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.

The Influence of Porous Asphalt Pavement Based on DEMATEL

2012 ◽  
Vol 178-181 ◽  
pp. 1333-1337 ◽  
Author(s):  
Ching Tsung Hung ◽  
Shih Huang Chen ◽  
Chia Chen Wu
Keyword(s):  
High Performance ◽  
Asphalt Pavement ◽  
Laboratory Method ◽  
Road User ◽  
Porous Asphalt ◽  
Decision Method ◽  
Drainage Capacity ◽  
Pavement Construction ◽  
The Relationship ◽  
Multiple Conditions

Taiwan position is in the subtropics, the climate is high temperature and much rains of year. Freeway mostly uses traditional dense grade in pavement construction, so the pavement could not remove water quickly in rainy day. It will deteriorate by rutting and aging, due to increasing maintenance frequency and cost. Porous asphalt pavement has high performance on road user safe and amenity in many countries. But the prescription in porous asphalt is Variable, for example, the fiber has miner and wood. Base on multiple conditions, the best performance can choice by multiple criteria decision method. This methodology needs the criteria under independent, but the real world is not. The study use Decision-Making Trial and Evaluation Laboratory method to establish the relationship in criteria. With result, the drainage capacity was the important factor in porous asphalt pavement.

Utilization of Synthetic Coarse Aggregate of Calcined Clay in Asphalt Mixtures in the Amazon Region

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Nilton de Souza Campelo ◽  
Arlene Maria Lamêgo da Silva Campos ◽  
Aroldo Figueiredo Aragão
Keyword(s):  
Coarse Aggregate ◽  
Amazon Region ◽  
Asphalt Mixtures ◽  
Calcined Clay
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