Effect of Aggregate Morphological Characteristics on the High-Temperature Performance of Steel Slag Based HMA

2014 ◽  
Vol 599 ◽  
pp. 19-22 ◽  
Author(s):  
Liu Jing Zi Qiu ◽  
Zong Wu Chen ◽  
Meng Wang ◽  
Wen Bo Zeng
Keyword(s):  
High Temperature ◽  
Permanent Deformation ◽  
Steel Slag ◽  
Morphological Characteristics ◽  
Road Construction ◽  
Temperature Performance ◽  
Pollution Research ◽  
Steel Output ◽  
Wheel Tracking ◽  
Quality Indexes

Steel slag, taking up about 20% of crude steel output in China, has caused many serious problems to environment, such as soil damage, water pollution. Research on the way of effective application of steel slag is always a hot topic. The utilization of steel slag in road construction as coarse aggregate is a promising way. Many researches on the mechanical characteristics of steel slag based HMA have been conducted in laboratory, and the quality indexes of steel slag such as angularity coefficient, dust content can be controlled by artificial way due to small demand for research destination. The lack of effective way to control the quality indexes of steel slag aggregate during processing is one of the main factors that limits its wide use in entity projects. In order to express the significance of quality control in steel slag aggregate production, this paper estimates the effect of different morphology on high-temperature performance of steel slag based HMA. High-temperature performances were carried out by wheel tracking test and permanent deformation test, results were discussed in this research.

The Research on the Index of High Temperature Performance of Asphalt Mixture in Airfield

2013 ◽  
Vol 723 ◽  
pp. 1076-1083 ◽  
Author(s):  
Ping Li ◽  
Lie Ping Wang ◽  
Wei Lei ◽  
Bao Lin Xiong
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Dynamic Stability ◽  
Asphalt Mixture ◽  
Evaluation Index ◽  
Design Parameters ◽  
Advantages And Disadvantages ◽  
Temperature Performance ◽  
Performance Evaluation Index ◽  
Wheel Tracking

In order to solve current airfield asphalt road surface high temperature performance evaluation index defective problem, we apply the humbug wheel tracking test, general rutting test and uniaxial penetration test ,and use different evaluation index to carry on the analysis. Test results show that shear strength index and rutting test index on the contrary, regression dynamic stability can't distinguish between SMA - 13 and AC - 20 high temperature performance advantages and disadvantages, creep slope and dynamic stability index consistent; At the same time, the use of bailey method design parameters and asphalt cement parameters on its verification found that bailey method can further explain mixture grading high temperature performance advantages and disadvantages, ratio of filler to bitumen and dynamic stability, shear strength, creep slope has a good correlation, and asphalt film thickness and its correlation is poor. So suggest using dynamic stability and humbug wheel tracking creep slope, rutting depth combination evaluation mixture at high temperature performance advantages and disadvantages.

scholarly journals High Temperature Performance of SBS and LM-S Modified Asphalt Mixtures by Triaxial Test

2021 ◽  
Vol 293 ◽  
pp. 02029
Author(s):  
Tang-Baoli ◽  
Ren-yongqiang ◽  
Chen-Xiangmei ◽  
Hou-Huifang ◽  
Liang-Jianping
Keyword(s):  
High Temperature ◽  
Creep Rate ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Deviatoric Stress ◽  
Repeated Loading ◽  
Flow Number ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Sbs Modified Asphalt

In order to study the high temperature performance of LM-S modified asphalt mixture and SBS modified asphalt mixture, repeated loading creep test was used to study the influence of temperature and deviatoric stress on the axial permanent deformation of the two kinds of asphalt mixture. At the same time, Permanent deformation, ε@5000, flow number FN and creep rate were select to evaluation of high temperature performance from different directions. The results show that the ε@5000 and creep rate are failed in the condition of high temperature and large deviatoric stress, so it hast widely practicable. The flow number FN is also limited by the conditions, which leads to the distortion of the flow number at lower temperature and smaller deviatoric stress so it is not easy to direct used as the evaluation index. Axial permanent deformation can reflect the permanent deformation in different cycles which is an excellent index to evaluate the high temperature performance of the two kinds of asphalt mixture, it is recommended to use axial permanent deformation to compare the LM-S modified asphalt mixture and SBS modified asphalt mixture The experimental results show that the axial permanent deformation of the LM-S modified asphalt mixture is always less than that of SBS modified asphalt mixture,it indicating that the high temperature rutting resistance of the LM-S modified asphalt mixture is better than that of SBS modified asphalt mixture.

scholarly journals Effect of Recycled Shell Waste as a Modifier on the High- and Low-Temperature Rheological Properties of Asphalt

2021 ◽  
Vol 13 (18) ◽  
pp. 10271
Author(s):  
Yuchen Guo ◽  
Xuancang Wang ◽  
Guanyu Ji ◽  
Yi Zhang ◽  
Hao Su ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Properties ◽  
Low Temperatures ◽  
High Speed ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Temperature Performance

The deteriorating ecological environment and the concept of sustainable development have highlighted the importance of waste reuse. This article investigates the performance changes resulting from the incorporation of shellac into asphalt binders. Seashell powder-modified asphalt was prepared with 5%, 10%, and 15% admixture using the high-speed shear method. The microstructure of the seashell powder was observed by scanning electron microscope test (SEM); the physical-phase analysis of the seashell powder was carried out using an X-ray diffraction (XRD) test; the surface characteristics and pore structure of shellac were analyzed by the specific surface area Brunauer-Emmett-Teller (BET) test; and Fourier infrared spectroscopy (FTIR) qualitatively analyzed the composition and changes of functional groups of seashell powder-modified asphalt. The conventional performance index of seashell powder asphalt was analyzed by penetration, softening point, and ductility (5 °C) tests; the effect of seashell powder on asphalt binder was studied using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR) at high and low temperatures, respectively. The results indicate the following: seashell powder is a coarse, porous, and angular CaCO3 bio-material; seashell powder and the asphalt binder represent a stable physical mixture of modified properties; seashell powder improves the consistency, hardness, and high-temperature performance of the asphalt binder but weakens the low-temperature performance of it; seashell powder enhances the elasticity, recovery performance, and permanent deformation resistance of asphalt binders and improves high-temperature rheological properties; finally, seashell powder has a minimal effect on the crack resistance of asphalt binders at very low temperatures. In summary, the use of waste seashells for recycling as bio-modifiers for asphalt binders is a practical approach.

Research on the Permanent Deformation Behavior of Asphalt Mixture with Basic Oxygen Furnace Slag

2013 ◽  
Vol 689 ◽  
pp. 304-308
Author(s):  
Zong Wu Chen ◽  
Shao Peng Wu ◽  
Jun Xie ◽  
Ju Yong Chen
Keyword(s):  
Deformation Behavior ◽  
Permanent Deformation ◽  
Steel Slag ◽  
Asphalt Mixture ◽  
Road Construction ◽  
Load Cycle ◽  
Basic Oxygen Furnace ◽  
Basic Oxygen ◽  
Permanent Strain ◽  
Study Results

Steel slag, a kind of industrial waste, has been considered applying in road construction as aggregate based on abundant indoor tests. The permanent deformation performance of asphalt mixture with Basic Oxygen Furnace (BOF) slag is evaluated by test with UTM-25 and simulation with equations at different temperatures and various stress levels in this study. Results show that the permanent deformation behavior of BOF base asphalt mixture is relatively sensitive to temperature and it can be perfectly modeled with proper equations, otherwise, strain per load cycle of specimen is responsible for mixture failure instead of accumulated permanent strain.

scholarly journals Influence of Binder Property and Mortar Thickness on High-Temperature Performance of Cold Recycled Mixtures with Asphalt Emulsion

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2718 ◽  
Author(s):  
Lei Gao ◽  
Zhanqi Wang ◽  
Yanping Liu ◽  
Junqiu Zheng ◽  
Hua Li
Keyword(s):  
High Temperature ◽  
Permanent Deformation ◽  
Rheological Parameters ◽  
Asphalt Emulsion ◽  
Flow Number ◽  
Rutting Resistance ◽  
Temperature Performance ◽  
Asphalt Emulsions ◽  
Cold Recycling ◽  
Marshall Stability

Four kinds of cold recycling (CR) mixtures with different asphalt emulsions were studied for their high-temperature performance in both binder properties and internal structures aspects. Digital image processing was introduced to determine the thickness spectrum for the asphalt mortar of the CR mixtures from a mesoscopic perspective. The time–temperature sweep (TTS) test was conducted to obtain the rheological parameters of each corresponding emulsified residue and the permanent deformation performance of each CR mixture was measured by dynamic creep test. A principle component analysis (PCA) was used to compare the typical performance parameters of the CR mixtures and find the factors controlling the rutting resistance of CR mixtures. The results show that the high-temperature performance of the CR mixtures with a modified emulsified asphalt showed improvements relative to the nominal case. Including Marshall stability, several parameters from the rheological properties of binder (G*/sinδ, flow number) and mortar thickness (max, range proportion 0–10 mm) could significantly influence the high-temperature performance and rutting resistance of the CR mixtures.

Permanent Deformation Behavior of Composite Structure Asphalt Concrete

2010 ◽  
Vol 34-35 ◽  
pp. 1477-1482
Author(s):  
Pei Long Li ◽  
Zheng Qi Zhang ◽  
Bing Gang Wang
Keyword(s):  
High Temperature ◽  
Asphalt Concrete ◽  
Composite Structure ◽  
Deformation Behavior ◽  
Composite Structures ◽  
Permanent Deformation ◽  
Maximum Shear Stress ◽  
Shear Stresses ◽  
Element Analysis ◽  
Temperature Performance

In order to study the high-temperature performance of composite structure asphalt concrete specimens, cylindrical and plate double-layer specimens with two asphalt mixtures are prepared to conduct uniaxial repeated load permanent deformation test and wheel tracking test. The deformation behavior and mechanical characteristics are analyzed and the relationship between rut deformation and mechanical parameters are also discussed. In addition, according to finite element analysis, the deformation mechanism of composite structures under the same loads was discussed. The results and analysis indicate that the deformation behaviors of the specimens with different structures are different significantly despite the same total thickness. Among those specimens, S（4/6）has the smallest deformation and corresponding mechanical parameter εp/Fn is also the smallest under the same load. The maximum shear stresses and their occurrence in different positions for different composite structures have discrepancies. The maximum shear stress of S（4/6）is smaller than other structures, which appears in the upper layer having better high temperature performance. This is the reason that the resistance to permanent deformation of S（4/6） is best among the three composite structures.

Research and Analysis of Temperature Anti-Rutting Performance Evaluation Index for Asphalt Pavement

2014 ◽  
Vol 587-589 ◽  
pp. 1199-1203
Author(s):  
Rui Jun Wu
Keyword(s):  
Performance Evaluation ◽  
High Temperature ◽  
Dynamic Stability ◽  
Evaluation Index ◽  
Advantages And Disadvantages ◽  
Temperature Performance ◽  
Wheel Tracking Test ◽  
Performance Evaluation Index ◽  
Wheel Tracking ◽  
Hamburg Wheel Tracking

In order to solve current airfield asphalt road surface high temperature performance evaluation index defective problem, through the hamburg wheel tracking test, general rutting test and uniaxial penetration to test three gradation mixture, and comprehensive analysis of dynamic stability, creep slope and the shear strength index. So suggest using dynamic stability and hamburg wheel tracking creep slope, rutting depth combination evaluation mixture at high temperature performance advantages and disadvantages.

Research on Pavement Performance of Steel Slag Conductive Asphalt Concrete for Deicing and Snow Melting

2012 ◽  
Vol 509 ◽  
pp. 168-174 ◽  
Author(s):  
Feng Chen ◽  
Mei Zhu Chen ◽  
Shao Peng Wu ◽  
Ji Zhe Zhang
Keyword(s):  
High Temperature ◽  
Asphalt Concrete ◽  
Steel Slag ◽  
Fatigue Performance ◽  
Pavement Performance ◽  
Snow Melting ◽  
Moisture Susceptibility ◽  
Temperature Performance ◽  
Indirect Tensile ◽  
Water Saturated

The key point of preparing conductive asphalt concrete for deicing and snow melting is pavement performance must satisfy the requirements before it can melt snow successfully. This study prefers to prepare electrically conductive asphalt concrete choosing steel slag as the whole aggregates and conductive minerals, while mixed with graphite and carbon fiber. Moisture susceptibility has been evaluated through water-saturated Marshall Stability test and indirect tensile splitting strength test. High temperature performance and fatigue performance were analyzed through dynamic creep test and indirect tensile fatigue test. Results indicate: High temperature performance of steel slag conductive asphalt concrete is better than ordinary basalt asphalt concrete, while its moisture susceptibility and fatigue performance is not good enough and need to be improved.

scholarly journals Study on Quantitative Characterization of Morphological Characteristics and High Temperature Performance Evaluation of Coarse Aggregate Based on Computer Vision

2021 ◽  
Vol 7 ◽  
Author(s):  
Zhanliang Liu ◽  
Chen Zhang ◽  
Linlong Shao ◽  
Jiangfeng Wang
Keyword(s):  
Performance Evaluation ◽  
High Temperature ◽  
Laboratory Tests ◽  
Coarse Aggregate ◽  
Morphological Characteristics ◽  
Processing Parameters ◽  
Evaluation Index ◽  
Identification System ◽  
Temperature Performance ◽  
Performance Evaluation Index

The morphological characteristics of aggregate include outline shape, angularity, and surface texture, which determine the mutual extrusion and friction between aggregates, and significantly affect the performance of asphalt pavement. At present, the research on the morphological characteristics of coarse aggregate is mainly focused on indoor visual identification technology (AIMS, XCT, etc.), in which the applicability of the proposed aggregate shape characterization index is weak, and these instruments could not serve the practical engineering well. In this article, the Coarse Aggregate Morphological Identification System (CAMIS) is developed based on computer vision technology, and the system can recognize the shape features of aggregates above 2.36 mm particle size and carry out uninterrupted feeding and removal based on the mechanical arm system, which can realize large sample detection. Based on CAMIS aggregate identification system and laboratory tests (rutting test, dynamic modulus test, and penetration shear test), the shape identification and performance test of aggregate samples from construction site are carried out, and an aggregate performance evaluation index, CEI, suitable for high-temperature areas is proposed in combination with the improved response surface method. The processing parameters of vertical shaft impact aggregate crusher are optimized based on the CEI index, and the recommended processing parameters are verified by laboratory tests. The results show that the morphological characteristics of coarse aggregate affect the high temperature performance in order angularity, needle flake, axial coefficient, and convexity. The combination of processing parameters of vertical axis impact crusher is recommended to be of 45 m/s rotational speed, 3 t/h feed quantity, and 30% air intake. Verified by laboratory tests, the aggregate identification system CAMIS developed in this article and the proposed aggregate performance evaluation index, CEI, are highly reliable.

Research on Basalt Fiber Asphalt Concrete's High Temperature Performance

2014 ◽  
Vol 505-506 ◽  
pp. 39-42 ◽  
Author(s):  
Chun Mei Gao ◽  
Shuo Han ◽  
Kai Xuan Zhu ◽  
Zhen Yong Wang
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Dynamic Stability ◽  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Basalt Fiber ◽  
Test Method ◽  
Optimum Amount ◽  
Temperature Performance ◽  
Shear Performance

Conduct experimental study on high temperature performance about asphalt concrete with 6mm basalt fiber and ordinary asphalt concrete, 6mm fibers whose dosage is 0.12%0.15% and 0.17%, test method is high temperature rut test, test temperature is 60°C. The results show that basalt fiber can improve the high temperature properties of asphalt concrete substrate, in which basalt fiber asphalt concrete maximum dynamic stability value is almost 1.27 times that of ordinary asphalt concrete, permanent deformation is 34.02% lower than that of the ordinary asphalt concrete, improved the shear performance of asphalt concrete;for high temperature performance, the optimum amount of value about 6mm basalt fiber is 0.15% .

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