Uniform Experimental Design of Coarse Aggregate Asphalt Pavement

2013 ◽  
Vol 753-755 ◽  
pp. 678-681
Author(s):  
Li Jie Ma ◽  
Jin Yu Zhang
Keyword(s):  
Particle Size ◽  
Design Research ◽  
Coarse Aggregate ◽  
Uniform Design ◽  
Asphalt Mixture ◽  
Degree Theory ◽  
The Road ◽  
Relational Degree ◽  
Size Grade ◽  
Maximum Particle

Coarse aggregate of asphalt mixture is crucial to the road performance. In this paper, by using the method of uniform design research, particle size of the aggregate were studied influence to CBR value with nominal maximum particle size 13.2mm aggregate. Further to determine the critical particle size grade by gray relational degree theory.

scholarly journals Evaluation of Siltation Degree of Permeable Asphalt Pavement and Detection of Noise Reduction Degree

2020 ◽  
Vol 11 (1) ◽  
pp. 349
Author(s):  
Shuang Chen ◽  
Xuechun Lin ◽  
Chuanfeng Zheng ◽  
Xuedong Guo ◽  
Wuxing Chen
Keyword(s):  
Particle Size ◽  
Noise Reduction ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Test Machine ◽  
Road Noise ◽  
The Road ◽  
Before And After ◽  
Sludge Particle

This study mainly uses PFC (particle follow code) to simulate the void characteristics of permeable asphalt mixture, and uses these to simulate the silting process. Then, a tire drop test was used to evaluate the noise reduction performance of permeable asphalt concrete. Finally, a self-made ring rutting test machine was used to simulate the silting process. Through experiments, the following conclusions were obtained: 1. The critical size of the sludge particle size is 0.3 mm–0.6 mm. 2. The quality of the water-permeable asphalt concrete specimens increased by 13% before and after silting, and the porosity of the specimens finally decreased from about 20% to about 8%. The water-permeable function only retained less than 20% of the original, and the water-permeable function was basically lost. 3. By measuring the road noise detection, it was found that the road noise is directly proportional to the degree of blockage of the permeable road. Compared with the original road with a perfect permeable function, the road noise of the completely blocked road increased by about 4 decibels. This study reveals the silting process of permeable asphalt mixture and the key particle size of the silt, which is of great significance for the detection, cleaning and maintenance of permeable asphalt pavements.

scholarly journals The Influence of Eggshell as Coarse Aggregate Replacement in Hot Mix Asphalt

CONSTRUCTION ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 1-11
Author(s):  
Ng Cui Ming ◽  
Ramadhansyah Putra Jaya ◽  
Haryati Awang
Keyword(s):  
Hot Mix Asphalt ◽  
Coarse Aggregate ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Modified Asphalt ◽  
The Road ◽  
Road Pavement ◽  
Road Users ◽  
Indirect Tensile ◽  
Pavement Structures

Hot Mix Asphalt (HMA) is the most commonly used in Malaysia for highways, interstates and roads due to its flexibility, economical, strong and provide safe riding quality for road users. Over the years, the increase of damage on pavement roads in Malaysia has become a severe issue although the road did not achieve its design life. Hence, to reduce damage and defect, an improvised road pavement structures is needed. Various studies have been conducted to identify the new materials that can be used as a replacement in hot mix asphalt. In this research, the purpose is to evaluate the performance of eggshell as coarse aggregate replacement in hot mix asphalt. The gradation for aggregate used in this mixture is AC14. The weight for total mixing of the aggregates used is 1200g while the grade for bitumen is 60/70. The samples were mixed with eggshell in the various percentages of 0%, 5%, 10%, 15% and 20% by total weight of aggregate size 5mm. The laboratory tests carried out to determine the properties of aggregates included, aggregate impact value and aggregate crushing value. Besides, penetration and softening point were also performed to determine the properties of bitumen. Several types of test were conducted towards the samples, which are Marshall Test, Indirect Tensile Strength and Cantabro Test. The results exhibit that the conventional asphalt mixture is more effective than modified asphalt mixture. The replacement of eggshell as coarse aggregate was not enough improvement to the performance of asphalt pavement as the performance of conventional mixture is more stable than modified mixture.

Research on Large Partical Size and Porous Rubber Modified Asphalt Mixture Repairing Techniques Used in “White and Black” Pavement

2014 ◽  
Vol 1061-1062 ◽  
pp. 386-391
Author(s):  
Zhong Ping Yao ◽  
Zhen Bei Chen ◽  
Gong Liang Zhang ◽  
Meng Li
Keyword(s):  
Coarse Aggregate ◽  
Asphalt Mixture ◽  
Performance Characteristics ◽  
Modified Asphalt ◽  
The Road ◽  
Construction Scheme ◽  
Road Performance ◽  
Pavement Structure ◽  
And Performance ◽  
Partical Size

The paper Introduces the structure composition and performance characteristics of the large partical size and porous rubber modified asphalt mixture, analyses the road performance of mixtures, on the basis of the characteristics of higher proportion of coarse aggregate and poriness, puts forward the practical and feasible construction scheme. It will be a beneficial exploration for the development and application of the large partical size and porous rubber modified asphalt mixture in the "white and black" pavement structure.

Coarse Aggregate Gradation Design Index and Method of Asphalt Mixture

2013 ◽  
Vol 724-725 ◽  
pp. 1489-1494 ◽  
Author(s):  
Ye Mao Zhang ◽  
Mu Lian Zheng ◽  
Guang Wei Hu ◽  
Qi Yang Zhu
Keyword(s):  
Coarse Aggregate ◽  
Size Range ◽  
Uniform Design ◽  
Asphalt Mixture ◽  
Grey System Theory ◽  
Pavement Performance ◽  
Particle Sizes ◽  
Grey System ◽  
Aggregate Gradation ◽  
Main Factor

The gradation of asphalt mixture is a main factor on the asphalt pavement performance, and coarse aggregate skeleton is an effect of distribution in the primary factor. The article analyses the interaction among the particle sizes of coarse aggregate by VCA and CBR double controlling index of aggregate gradually filling test, and identifies the key sizes of coarse aggregate by uniform design and grey system theory, and recommends particles size range content of coarse aggregate. The results show that coarse aggregate skeleton gradation of asphalt mixture by filling test has a good correlation with VCA and CBR.

scholarly journals Geometric Characteristics of BOF Slag Coarse Aggregate and its Influence on Asphalt Concrete

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 741 ◽  
Author(s):  
Dezhi Kong ◽  
Meizhu Chen ◽  
Jun Xie ◽  
Meiling Zhao ◽  
Chao Yang
Keyword(s):  
Asphalt Concrete ◽  
Coarse Aggregate ◽  
Asphalt Mixture ◽  
Damage Resistance ◽  
Air Voids ◽  
Geometric Characteristics ◽  
The Road ◽  
Coarse Aggregates ◽  
Angular Performance ◽  
Bof Slag

In order to examine the geometric characteristics of BOF (blast oxygen furnace) slag coarse aggregate, the aggregate image measurement system (AIMS) was used to analyze the sphericity, gradient angularity and micro texture. Both volumetric and mechanical properties were studied to evaluate the influence of geometric characteristics of BOF slag coarse aggregate on asphalt concrete. The experimental results show that the BOF slag coarse aggregate has the characteristics of high sphericity, good angular performance and rough surface texture. The geometric characteristics of BOF slag has obvious influence on the volume performance of asphalt concrete. the higher sphericity of BOF slag causes an increase of the air voids of asphalt mixture. BOF slag coarse aggregate can effectively improve the road performances of asphalt concrete. BOF slag’s higher sphericity and angularity improve the moisture damage resistance and rutting resistance of asphalt concrete. Results indicate that better angularity can slightly enhance the moisture resistance property of asphalt concrete, but excessively high angularity of BOF slag coarse aggregates reduces the anti-rutting properties of asphalt mixture.

Experimental Study on Mix Ratio Design and Road Performance of Medium and Small Deformation Seamless Expansion Joints of Bridges

2021 ◽  
pp. 036119812098474
Author(s):  
Pengzhen Lu ◽  
Chenhao Zhou ◽  
Simin Huang ◽  
Yang Shen ◽  
Yilong Pan
Keyword(s):  
Traffic Safety ◽  
Performance Test ◽  
Asphalt Mixture ◽  
Small Deformation ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Mixture Ratio ◽  
The Road ◽  
Marshall Test ◽  
Road Performance

Expansion joints are a weak and fragile part of bridge superstructure. The damage or failure of the expansion joint will lead to the decline of bridge durability and endanger the bridge structure and traffic safety. To improve the service life and performance of bridge expansion joints, the ideal method is to use seamless expansion joints. In this study, starting from the commonly used asphalt mixture gradation of seamless expansion joint, and taking into account the actual situation of bridge expansion joint structure and environment in China, the gradation and asphalt-aggregate ratio are preliminarily designed. Through a Marshall test, the corresponding asphalt mixture is evaluated and analyzed according to the stability, flow value, and void ratio, and the optimal gradation and asphalt-aggregate ratio are determined. Finally, the asphalt mixture is prepared with the mixture ratio design, and the test results of an immersion Marshall test, fatigue performance test, and full-scale test verify that the asphalt mixture meets the road performance requirements of seamless expansion joints. On the basis of the experimental data, the performance of large sample asphalt mixture is continuously tested, compared, and optimized. The results show that the asphalt mixture ratio designed is true and reliable, which can provide reference for the optimal design of seamless expansion joint filler.

scholarly journals Evaluation of the Effects of Filler Fineness on the Properties of an Epoxy Asphalt Mixture

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2003
Author(s):  
Wei Xu ◽  
Jintao Wei ◽  
Zhengxiong Chen ◽  
Feng Wang ◽  
Jian Zhao
Keyword(s):  
Particle Size ◽  
Average Particle Size ◽  
Asphalt Mixture ◽  
Average Particle ◽  
Fine Dust ◽  
Bonding Structure ◽  
Epoxy Asphalt ◽  
Mineral Powder ◽  
Marshall Stability ◽  
Mixture Sample

The type and fineness of a filler significantly affect the performance of an asphalt mixture. There is a lack of specific research on the effects of filler fineness and dust from aggregates on the properties of epoxy asphalt (EA) mixtures. The effects of aggregate dust and mineral powder on the properties of an EA mixture were evaluated. These filler were tested to determine their fineness, specific surface area and mineral composition. The effects of these fillers on the EA mastic sample and mixture were evaluated. The morphology of the EA mastic samples was analyzed using scanning electron microscopy (SEM). The effects of the fillers on the Marshall stability, tensile strength and fatigue performance of the EA mixture were evaluated. The dust from the aggregates exhibited an even particle size distribution, and its average particle size was approximately 20% of that of the mineral powder. The SEM microanalysis showed that the EA mastic sample containing relatively fine dust formed a tight and dense interfacial bonding structure with the aggregate. The EA mixture sample containing filler composed of dust from aggregate had a significantly higher strength and longer fatigue life than that of the EA sample containing filler composed of mineral powder.

scholarly journals Investigation of the Formation Mechanism and Environmental Risk of Tire—Pavement Wearing Waste (TPWW)

2021 ◽  
Vol 13 (15) ◽  
pp. 8172
Author(s):  
Kechen Wang ◽  
Xiangyu Chu ◽  
Jiao Lin ◽  
Qilin Yang ◽  
Zepeng Fan ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Organic Contaminants ◽  
Asphalt Mixture ◽  
Fine Fraction ◽  
Crumb Rubber ◽  
Environmental Benefit ◽  
The Road ◽  
Open Graded Friction Course ◽  
Volatile Alkanes ◽  
Physical And Chemical

Tire—pavement interaction behaviours result in large amounts of wearing waste matter, which attaches to the surface of the pavement and is directly exposed to the surrounding environment. This kind of matter imposes a great challenge to the environment of the road area. The current study is devoted to carrying out a comprehensive investigation of the formation mechanism of tire—pavement wearing waste (TPWW), as well as the resulting environmental risks. A self-developed piece of accelerated polishing equipment, the Harbin advanced polishing machine (HAPM), was employed to simulate the wearing process between vehicle tires and pavement surfaces, and the TPWW was collected to conduct morphological, physical, and chemical characterisations. The results from this study show that the production rate of TPWW decreases with the increase in polishing duration, and the coarse particles (diameters greater than 0.425 mm) account for most of the TPWW obtained. The fine fraction (diameter smaller than 0.425 mm) of the TPWW comprises variously sized and irregularly shaped rubber particles from the tire, as well as uniformly sized and angular fine aggregates. The environmental analysis results show that volatile alkanes (C9–C16) are the major organic contaminants in TPWW. The Open-Graded Friction Course (OGFC) asphalt mixture containing crumb rubber as a modifier showed the highest risk of heavy metal pollution, and special concern must be given to tire materials for the purpose of improving the environmental conditions of road areas. The use of polyurethane as a binder material in the production of pavement mixtures has an environmental benefit in terms of pollution from both organic contaminants and heavy metals.

Effects of maximum particle size of coarse aggregates and steel fiber contents on the mechanical properties and impact resistance of recycled aggregate concrete

2021 ◽  
pp. 136943322110179
Author(s):  
DongTao Xia ◽  
ShaoJun Xie ◽  
Min Fu ◽  
Feng Zhu
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Steel Fiber ◽  
Impact Resistance ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Coarse Aggregates ◽  
Maximum Particle Size ◽  
Maximum Particle

Fiber reinforced recycled aggregate concrete has become a new type of green concrete material. The maximum particle size of coarse aggregates and steel fiber contents affect the mechanical properties and impact resistance of recycled aggregate concrete. However, such studies are rare in literature. The present paper shortens the gap through experimental study. A total of 144 specimens of 12 kinds of concrete mixtures were tested, which adopted different steel fiber volume admixtures (0%, 0.8%, 1.0%, 1.2%) and recycled coarse aggregates in different maximum particle sizes (9.5, 19, 31.5 mm) replacing 30% natural coarse aggregate. The compressive strength, splitting tensile strength, and impact resistance of the 12 concrete mixtures were tested. The results showed that the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete increased first and then decreased with the increase of the maximum particle size. The recycled aggregate concrete with the maximum particle size of 19 mm had the highest mechanical properties and impact resistance. Besides, with the increase of steel fiber content, the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete showed an increasing trend. Considering a large amount of experimental data and the coupling effect of steel fiber contents and the maximum particle size of coarse aggregates, the Weibull distribution function was introduced to analyze the impact test results and predict the number of resistance to impact under different failure probabilities. The results showed that the number of blows of the recycled aggregate concrete followed a two-parameter Weibull distribution, and the estimated value of the number of resistance to impact for failure increased with the increase of the failure probability.

Sign in / Sign up

Export Citation Format

Share Document