scholarly journals Fiber-Reinforcing Effect in the Mechanical and Road Performance of Cement-Emulsified Asphalt Mixtures

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2779
Author(s):  
Siyue Zhu ◽  
Zirui Xu ◽  
Xiantao Qin ◽  
Menghui Liao
Keyword(s):  
Asphalt Mixture ◽  
Temperature Stability ◽  
Fatigue Loading ◽  
Sem Analysis ◽  
Asphalt Mixtures ◽  
High Temperature Stability ◽  
Flexural Tensile Strength ◽  
Reinforced Cement ◽  
Emulsified Asphalt ◽  
Hot Mixed Asphalt

Cement-emulsified asphalt mixture (CEAM), a kind of cold mix asphalt mixture, has the advantages of energy conservation and emission reduction as well as easy construction. However, the performance of CEAM is not as good as hot mixed asphalt mixtures. Hence, in this study, two different fibers were adopted as the reinforcing phase to improve the comprehensive properties of CEAM. The results indicated that the addition proportion and curing time were crucial to fiber-reinforced cement-emulsified asphalt mixture (FRCEAM). The compressive strengths, water stability, and raveling resistances of FRCEAM preparations with polyester or brucite fibers (FRCEAM-PF and -BF, respectively) were enhanced significantly. FRCEAM-PF had the maximum flexural tensile strength and strain, which meant that its low-temperature performance was the best compared to FRCEAM-PF and CEAM. However, the contribution of PF to CEAM high-temperature stability was greater than that of BF. Fiber addition to CEAM not only enhanced the cycles of fatigue loading but also reduced sensitivity to changes in stress level. Furthermore, FRCEAM-BF durability was slightly better than that of FRCEAM-PF. SEM analysis indicated that fibers provided bridging and meshing effects. Although PF and BF showed different enhancement effects, both mixtures met the requirements for hot mixed asphalt mixtures.

Laboratory Study of Pavement Performance of Basalt Fiber-Modified Asphalt Mixture

2011 ◽  
Vol 266 ◽  
pp. 175-179 ◽  
Author(s):  
Yuan Xun Zheng ◽  
Ying Chun Cai ◽  
Ya Min Zhang
Keyword(s):  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Polyester Fiber ◽  
Pavement Performance ◽  
High Temperature Stability ◽  
Modified Asphalt ◽  
And Control ◽  
Temperature Crack

In order to discuss the effect of the basalt fiber on reinforcing pavement performance of asphalt mixtures, the optimum dosage of asphalt and fibers were studied by the method of Marshall test and rut test firstly. Then pavement performances of basalt fiber-modified asphalt mixtures were investigated through tests of high temperature stability, water stability and low temperature crack resistance, and compared with that of polyester fiber, xylogen fiber and control mixture. The testing results showed that the pavement performance of fiber-modified asphalt mixture are improved and optimized comparing with control asphalt mixture, and the performance of basalt fiber-modified asphalt mixture with best composition were excelled than those of polyester fiber and xylogen fiber.

scholarly journals Microwave Absorption Ability of Steel Slag and Road Performance of Asphalt Mixtures Incorporating Steel Slag

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 663 ◽  
Author(s):  
Baowen Lou ◽  
Zhuangzhuang Liu ◽  
Aimin Sha ◽  
Meng Jia ◽  
Yupeng Li
Keyword(s):  
Microwave Absorption ◽  
Steel Slag ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Microwave Absorber ◽  
Self Healing ◽  
High Temperature Stability ◽  
Road Performance ◽  
On The Road

Excessive usage of non-renewable natural resources and massive construction wastes put pressure on the environment. Steel slags, the main waste material from the metal industry, are normally added in asphalt concrete to replace traditional aggregate. In addition, as a typical microwave absorber, steel slag has the potential to transfer microwave energy into heat, thus increasing the limited self-healing ability of asphalt mixture. This paper aims to investigate the microwave absorption potentials of steel slag and the effect of its addition on road performance. The magnetic parameters obtained from a microwave vector network analyzer were used to estimate the potential use of steel slag as microwave absorber to heal cracks. Meanwhile, the initial self-healing temperature was further discussed according to the frequency sweeping results. The obvious porous structure of steel slag observed using scanning electron microscopy (SEM) had important impacts on the road performance of asphalt mixtures. Steel slag presented a worse effect on low-temperature crack resistance and water stability, while high-temperature stability can be remarkably enhanced when the substitution of steel slag was 60% by volume with the particle size of 4.75–9.5 mm. Overall, the sustainability of asphalt mixtures incorporating steel slag can be promoted due to its excellent mechanical and microwave absorption properties.

Study of Road Property of Basalt Fiber Asphalt Concrete

2012 ◽  
Vol 238 ◽  
pp. 22-25 ◽  
Author(s):  
Yuan Zhao Chen ◽  
Zhen Xia Li
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Polyester Fiber ◽  
Pavement Performance ◽  
High Temperature Stability ◽  
Reference Mixture ◽  
Temperature Crack

In order to discuss the effectiveness of basalt fiber in reinforcing pavement performance of asphalt mixtures, the pavement performances of basalt fiber asphalt mixtures were investigated by tests of high temperature stability, water stability and low temperature crack resistance, and compared with the pavement performance of asphalt mixtures with polyester fiber and xylogen fiber, and that of reference mixture. The results show that pavement performance of fiber asphalt mixture are improved and optimized comparing with reference asphalt mixture, the performance of asphalt mixture with basalt fiber are excelled than those with polyester fiber and xylogen fiber while the dosage of fibers is keeping at the optimum.

Research on the Paving Performance of Montmorillonite/SBS Modified Asphalt Mixtures

2012 ◽  
Vol 204-208 ◽  
pp. 4143-4146
Author(s):  
Zhong Guo He ◽  
Xin De Tang ◽  
Wen Jun Yin ◽  
Yi Fan Sun ◽  
Zhong Bo Liu
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
High Temperature Stability ◽  
Moisture Susceptibility ◽  
Modified Asphalt ◽  
Sbs Modified Asphalt ◽  
Enhanced Stability

Montmorillonite/SBS composite modifed asphalts were prepared by mixing montmorillonite with SBS-modified asphalt, further the corresponding asphalt mixtures were obtained. The paving technical indexes of the mixture such as physical properties, moisture suscepyibility, and high temperature stability were tested, and compared with that of the corresponding SBS-modifed asphalt mixture and base asphalt mixture. The results demonstrate that the montmorillonite/SBS composite modifed asphalt mixture exhibites enhanced stability, improved flow value and moisture susceptibility, and increased high temperature stability.

scholarly journals Feasibility Evaluation of Preparing Asphalt Mixture with Low-Grade Aggregate, Rubber Asphalt and Desulphurization Gypsum Residues

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1481 ◽  
Author(s):  
Xiaoliang Zhang ◽  
Ben Zhang ◽  
Huaxin Chen ◽  
Dongliang Kuang
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Crack Resistance ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Limestone Powder ◽  
Low Grade ◽  
High Temperature Stability ◽  
Temperature Crack

Road construction consumes great amounts of high-grade natural resources. Using low-grade natural rocks or some solid wastes as substitute materials is a hot topic. Considering this, the feasibility of using low-grade granite aggregate, solid waste-based filler (desulphurization gypsum residues, DGR) and binder (waste tire rubber modified asphalt, RMA) simultaneously in asphalt mixtures has been fully investigated in this research. The commonly used base asphalt and limestone powder (LP) filler were control groups. Material characteristics of raw materials mainly including micro-morphology, functional group, mineral phase, chemical composition and thermal stability were first evaluated in order to recognize them. Four asphalt mixtures (two asphalt binder and two filler) were then designed by standard Superpave method. Finally, a detailed investigation into the pavement performance of asphalt mixtures was carried out. The moisture damage resistance and low-temperature crack resistance were detected by the changing rules of stability, strength and fracture energy, and the high-temperature stability and fatigue performance were determined by wheel tracking test and indirect tensile (IDT) fatigue test, respectively. Results suggested that RMA and DGR both showed positive effects on the low-temperature crack resistance and fatigue property of the granite asphalt mixture. DGR also strengthened moisture stability. The contribution of RMA on high-temperature deformation resistance of the granite asphalt mixture was compelling. It can offset the insufficiency in high-temperature stability made by DGR. A conclusion can be made that asphalt mixture prepared with granite, DGR and RMA possesses satisfactory pavement performances.

scholarly journals Optimizing Gradation Design for Ultra-Thin Wearing Course Asphalt

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 189 ◽  
Author(s):  
Wentian Cui ◽  
Kuanghuai Wu ◽  
Xu Cai ◽  
Haizhu Tang ◽  
Wenke Huang
Keyword(s):  
High Temperature ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Wear Test ◽  
Asphalt Mixtures ◽  
Skid Resistance ◽  
High Temperature Stability ◽  
Functional Layer ◽  
Rutting Resistance ◽  
Road Surfaces

In recent years, ultra-thin wearing course asphalt mixture has been widely used in the reconstruction of old road surfaces and the functional layer of new road surfaces due to its good road performance. To improve the rutting resistance of ultra-thin wearing course asphalt mixture, this research presents an Ultra-thin Wearing Course-10 (UTWC-10) asphalt mixture with good high-temperature stability and skid resistance based on the Taylor system standard mesh specifications. The Course Aggregate Void Filling (CAVF) method is used to design the UTWC-10 asphalt mixture, which is compared with two other traditional ultra-thin wearing course asphalt mixtures on the basis of different laboratory performance tests. The high-temperature rutting test data shows that the rutting dynamic stability (DS) index of the UTWC-10 asphalt mixture is much higher than that of traditional wearing course asphalt mixtures, as it has better high-temperature stability. Moreover, anti-sliding performance attenuation tests are conducted by a coarse aggregate polishing machine. The wear test results show that the skid resistance of the UTWC-10 asphalt mixture is promising. The anti-sliding performance attenuation test can effectively reflect the skid resistance attenuation trend of asphalt pavement at the long-term vehicle load. It is verified that the designed UTWC-10 asphalt mixture shows excellent high-temperature rutting resistance and skid resistance, as well as better low temperature crack resistance and water stability than the traditional wearing course asphalt mixtures.

scholarly journals Evaluation of High-Temperature Performance of Asphalt Mixtures Based on Climatic Conditions

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 535
Author(s):  
Yan Mu ◽  
Zhen Fu ◽  
Jian Liu ◽  
Chen Li ◽  
Wenhao Dong ◽  
...  
Keyword(s):  
High Temperature ◽  
Dynamic Stability ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Climatic Conditions ◽  
Asphalt Mixtures ◽  
High Temperature Stability ◽  
Long Duration ◽  
Different Temperatures ◽  
Modified Formula

The dynamic stability of a rutting test does not optimally reflect the high-temperature stability of asphalt mixtures. In this study, a rutting test was performed over a long duration (4 h) at different temperatures (40, 50, 60, 70 °C) for three asphalt mixtures, namely, matrix AC-16, SMA-16, and modified AC-16 asphalt mixtures. Subsequently, the temperature rutting rate was obtained after considering the annual temperature conditions of Guangdong and Beijing in China. Because the conditions of the rutting test were different from that of the actual pavement, the rut depth was calculated using a modified temperature rutting rate. This modification considered four factors: wheel trace distribution, temperature, pavement thickness, and loading rate. The calculation of the temperature rutting rate considered the climatic conditions and utilized the rutting deformation data from hour 1–4 of the rutting tests, during which the asphalt mixture was in a stable creep period. Thus, the high-temperature stability of the asphalt mixture was reflected more scientifically by the temperature rutting rate than the dynamic stability. The high-temperature rut-resistance of the asphalt mixture was found to improve significantly after the introduction of two additives (anti-rutting agent and lignin fiber). The modified formula for rut depth can realistically predict the annual rutting depth for three asphalt mixtures in a one-way driving pavement.

Evaluation of Moisture Susceptibility for Asphalt Mixtures

2013 ◽  
Vol 361-363 ◽  
pp. 1563-1566
Author(s):  
Chuan Yi Zhuang ◽  
Ya Li Ye ◽  
Yan Zhou
Keyword(s):  
Mechanical Performance ◽  
Water Immersion ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Hot Water ◽  
High Temperature Stability ◽  
Air Voids ◽  
Freeze Thaw ◽  
Hot Water Immersion

Types of asphalt mixture with different gradations and air voids were designed. Tests on their indirect tensile strength, compressive strength and resilient modulus of compression under single axle compressing were taken to study the effects of two forms of water immersion (hot water immersion and freeze-thaw split test) on asphalt mixtures mechanical performance and high temperature stability. Test results point out that water immersion decreased asphalt mixtures performance seriously and the effect of freeze-thaw split tests on asphalt mixtures performance is far stronger than that of hot water immersion. Asphalt mixtures performance is related with its gradation and percent air voids. Asphalt mixtures with different gradation are different in their percent air voids, suitable gradation can form framework and filling action obviously, so to yield mixture with suitable percent air voids and good water stability.

scholarly journals Comparison of Asphalt Mixtures Designed Using the Marshall and Improved GTM Methods

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Jianbing Lv ◽  
Xu Zhancheng ◽  
Yin Yingmei ◽  
Zhang Jiantong ◽  
Sun Xiaolong ◽  
...  
Keyword(s):  
Large Scale ◽  
Heavy Traffic ◽  
Testing Machine ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Mixture Design ◽  
Asphalt Mixtures ◽  
Alternative Methods ◽  
High Temperature Stability ◽  
Heavy Load

The Marshall method is today considered the standard method of asphalt mixture design for practical engineering applications. By using this method, engineering designers reap the benefits of its easy implementation and inexpensive equipment requirements. However, the Marshall method also has shortcomings and limitations, such as the difficulty in simulating the actual working conditions of a road under heavy load. Therefore, it is desirable to develop alternative methods for designing asphalt mixtures that can simulate the actual conditions under which the road will be used and so enable technically superior road construction. The emergence of the gyratory testing machine (GTM) method represents a new direction in asphalt mixture design that could plan more effectively for heavy loads in a hot and humid environment. In this paper, the two design methods are compared on the basis of the oil-stone ratio, high-temperature stability, water stability, and rutting resistance of the mixes they recommend. We put forward an improved GTM method suitable for the high temperatures and heavy traffic in Guangdong Province. This work provides a foundation for the large-scale popularization and application of the GTM method.

scholarly journals Effects of Cement and Emulsified Asphalt on Properties of Mastics and 100% Cold Recycled Asphalt Mixtures

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 754 ◽  
Author(s):  
Yanan Li ◽  
Yuchao Lyv ◽  
Liang Fan ◽  
Yuzhen Zhang
Keyword(s):  
Tensile Strength ◽  
Rheological Properties ◽  
Subsurface Layer ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Mineral Filler ◽  
High Temperature Stability ◽  
Recycled Asphalt ◽  
Technical Specifications ◽  
Emulsified Asphalt

Cold recycled asphalt mixtures (CRAM) are a cost-effective and environmentally-friendly way to reuse reclaimed asphalt pavement (RAP). This paper evaluates the rheological properties and microstructure of mineral filler-asphalt mastic, mineral filler-residue mastic, and cement-residue mastic. Then, based on the premise of using 100% RAP with a gradation that was determined experimentally, the effects of emulsified asphalt and cement on the porosity, indirect tensile strength, tensile strength ratio, dynamic stability, and mechanical properties of CRAM were evaluated. It was found that the rheological properties and cohesive coefficient of the cement-residue mastic varied differently to those of the first two types of mastic and the results show that the addition of cement can greatly improve the interfacial bonding between binders and fillers in the mastic, thereby improving the water damage resistance and high-temperature stability of CRAM. The relationships between cement content and the dynamic modulus and phase angle of CRAM are different to that for emulsified asphalt obviously. In addition, under certain conditions, the properties of CRAM can meet the requirements of relevant technical specifications for its application to subsurface layer of pavement. Hence, the use of 100% RAP in CRAM may be feasible.

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