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Influence of Coarse-Aggregate Angularity on Asphalt ...

A lower coarse-aggregate angularity leads to a smaller skid resistance of the asphalt mixture. The angularity greatly influences the high-temperature and compaction performance of asphalt mixtures. Higher angularity leads to better high-temperature stability but causes difficulty in compaction.

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Effect of Coarse Aggregate Content on Stone Matrix

Stone matrix asphalt (SMA) is a gap-graded hot mixture that maximizes the binder and coarse aggregate contents. SMA mixtures have high proportions of coarse aggregate, binder, and mineral filler, and low proportions of middle-size aggregates compared with dense-graded mixtures. Cellulose fibers, mineral fibers, and polymers have been used as stabilizing additives to prevent draindown of the mastic before the SMA is placed and is allowed to cool (J). SMA was developed in Europe more than 20 years ago. SMA mixtures in Europe have been shown through field experience to be durable and more resistant to rutting than dense-graded mixtures. More than 50 SMA

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Effect of different coarse aggregate surface

2020-11-30  In the cement emulsified asphalt mixture, the coarse aggregate contacts the mixture of emulsified asphalt, cement and water. However, the measurement of the contact angle can only measure the contact angle between the liquid and solid. Therefore, this contact angle only tested the contact angle between the emulsified asphalt and coarse aggregate.

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Effects of coarse aggregate angularity on the ...

2018-9-20  The coarse aggregate horizontal orientation of the SMA-16 asphalt mixture was bigger than the AC-16 asphalt mixture. It indirectly reflected that the SMA asphalt mixture, with a dense coarse aggregate structure, had a better skeleton contact than the AC asphalt mixture, which belongs to the dense suspension structure.

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Influence of angularity and roughness of coarse

2019-3-10  Namely, with the angularity coefficient of coarse aggregate increase, the low-temperature performance of asphalt mixture would decrease. Meanwhile, when the angularity coefficient of coarse aggregate particle became large, the asphalt-interphase strength would increase, and the bending tensile strength of mixture would become small.

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Effect of different coarse aggregate surface

Cement emulsified asphalt mixtures are a kind of potential pavement material, but the adhesion between coarse aggregate and asphalt still needs to be studied. In this paper, a qualitative analysis method of the surface morphology of coarse aggregate was proposed and used to evaluate the surface morphologies of four kinds of coarse aggregate, including diabase, basalt, steel slag and recycled aggregate.

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Performance of Recycled Asphalt Pavement as Coarse ...

2013-8-11  From the laboratory study carried out to evaluate the performance of recycled asphalt pavement as coarse aggregate in concrete, the following main conclusions can be drawn: RAP aggregate has lower specific gravity and water absorption than the natural aggregate.

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Fractionated Reclaimed Asphalt Pavement (FRAP) as a

The use of fractionated reclaimed asphalt pavement (FRAP) was investigated as a partial replacement (0%, 20%, 35%, and 50%) of virgin coarse aggregate in

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What is Asphalt Aggregate? (with pictures)

The majority of aggregate in the mix is usually coarse, or large in size, followed by crushed stone and gravel. The remaining aggregate is composed of fillers, such as sand. Many construction companies and local governments have saved money and helped the environment by using recycled asphalt aggregate.

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Morphological characterization and mechanical

2017-11-15  Materials. The basalt coarse aggregates were divided into various size particles through standard sieve as the following particle diameters: 4.75–9.5 mm, 9.5–13.2 mm, 13.2–19 mm, 19–26.5 mm. The 4.75 mm aggregates were called for short to represent the particles with a diameter distribution between 4.75 and 9.5 mm.

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Influence of Coarse Aggregate Morphological

The properties of asphalt and aggregate involved in this study included RAP content, two-dimensional morphological properties of recycled coarse aggregate, three-dimensional angle of recycled coarse aggregate, and surface free energy of recycled asphalt.

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Effect of Coarse Aggregate Morphologies on the ...

2020-8-25  Recommendation scopes of aggregate morphologies were concluded. Results show that moisture susceptibility of asphalt mixture has a rising trend with the increase of angularity, texture, coarse aggregate angularity texture value (CAAT), and decrease of sphericity.

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Influence of Coarse-Aggregate Angularity on Asphalt ...

A lower coarse-aggregate angularity leads to a smaller skid resistance of the asphalt mixture. The angularity greatly influences the high-temperature and compaction performance of asphalt mixtures.

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Effects of coarse aggregate angularity on asphalt

Effects of coarse aggregate angularity on asphalt mixture’s macro performance Junfeng Gao Ph. D.

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The Effect of Morphological Characteristic of Coarse ...

2016-2-29  The morphological properties of coarse aggregates, such as shape, angularity, and surface texture, have a great influence on the mechanical performance of asphalt mixtures. This study aims to investigate the effect of coarse aggregate morphological properties on the high-temperature performance of asphalt mixtures. A modified Los Angeles (LA) abrasion test was employed to produce aggregates ...

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Standard of Crushing Value of Coarse Aggregates for ...

2020-1-20  Crushing resistance of coarse aggregate is the key to the stability and durability of the skeleton structure of permeable asphalt (PA) mixture. To determine the technical requirements of crushing value of coarse aggregate used in PA mixture, step-loading compression tests were conducted on the mixtures of PA-13 and a control asphalt

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Performance of Recycled Asphalt Pavement as Coarse ...

2013-8-11  The natural coarse aggregate used in the investigation is uncrushed natural gravel. The physical properties of the coarse aggregate are shown in Table 1. The tests were carried out in accordance with BS 812 [15]. Preparation and Physical Properties of RAP Aggregate RAP coarse aggregate was prepared by crushing waste asphalt pavement rubbles

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Aggregate Tests for Hot-Mix Asphalt

Coarse Aggregate • ASTM D5821 Determining the Percentage of Fractured Particles in Coarse Aggregate Figure 1 summarizes current state practices to control coarse aggregate particle shape and surface texture. All states surveyed have a minimum fractured face/ crushed particle requirement for coarse aggregate. Thirty eight

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Aggregate Washington Asphalt Pavement Association

Coarse aggregate. Defined by AASHTO M 147 as hard, durable particles or fragments of stone, gravel or slag retained on the No. 10 sieve. Usually coarse aggregate has a toughness and abrasion resistance requirement. Fine gradation. A gradation that,

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Fractionated Reclaimed Asphalt Pavement (FRAP) as a

The use of fractionated reclaimed asphalt pavement (FRAP) was investigated as a partial replacement (0%, 20%, 35%, and 50%) of virgin coarse aggregate in a ternary blend concrete containing cement, slag, and fly ash. The results demonstrated that up to 50% FRAP may be feasible in a

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Influence of Coarse-Aggregate Angularity on Asphalt ...

A lower coarse-aggregate angularity leads to a smaller skid resistance of the asphalt mixture. The angularity greatly influences the high-temperature and compaction performance of asphalt mixtures. Higher angularity leads to better high-temperature stability but causes difficulty in compaction. The angularity has a significant influence on the ...

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Effects of coarse aggregate angularity on asphalt

Effects of coarse aggregate angularity on asphalt mixture’s macro performance Junfeng Gao Ph. D.

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Effects of coarse aggregate angularity on the ...

Abstract The microstructure characteristic of asphalt mixture has substantial effects on its macroscopic mechanical properties. The study on the structural characteristics of asphalt mixtures involving the microscopic scale has rarely been considered. This study investigates the effects of the angularity of coarse aggregate on the microstructure of two commonly practiced asphalt mixture ...

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Investigation of Coarse Aggregate Strength for Use in ...

2020-10-13  Stone Matrix Asphalt is a gap-graded hot-mix asphalt mixture composed of a coarse aggregate skeleton and a binder-rich mortar. The mixture type was first introduced to the United States in 1991, with one of the first test sections placed on I-70 near Richmond, Indiana.

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Exploring the Durability Specification of Coarse

Coarse and fine aggregate constitutes approximately 93% of dense graded airport asphalt and the aggregate properties can affect asphalt surface performance. Despite a general trend towards...

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Rutting Resistance of Hot Mix Asphalt Containing

2021-6-22  The use of recycled concrete aggregate (RCA) as a part of coarse aggregates in asphalt pavements confers economic and environmental benefits. Coarse RCA (CRCA) has inferior mechanical and physical properties compared to natural aggregates due to very porous and weakly adhered cement mortar. In this study, CRCA surfaces were coated with waste plastic bottles (WPB) and used at

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Performance of Recycled Asphalt Pavement as Coarse ...

2013-8-11  The natural coarse aggregate used in the investigation is uncrushed natural gravel. The physical properties of the coarse aggregate are shown in Table 1. The tests were carried out in accordance with BS 812 [15]. Preparation and Physical Properties of RAP Aggregate RAP coarse aggregate was prepared by crushing waste asphalt pavement rubbles

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Geometric Characteristics of BOF Slag Coarse Aggregate

2019-3-4  materials Article Geometric Characteristics of BOF Slag Coarse Aggregate and its Influence on Asphalt Concrete Dezhi Kong 1, Meizhu Chen 1, Jun Xie 1,*, Meiling Zhao 2 and Chao Yang 1 1 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China; [email protected] (D.K.); [email protected] (M.C.); [email protected] (C.Y.)

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Geometric Characteristics of BOF Slag Coarse

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

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Micromechanics Analysis of Viscoelasticity for Asphalt ...

2008-4-15  Key words: asphalt mixture, viscoelasticity, micromechanics, coarse aggregate, void, comprehensive influencecoefficient Cite this article Huang Xiao-ming Li Han-guang Zhang Yu-qing.

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