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 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% .

Study on the Performance of Nano Calcium Carbonate Modified Asphalt Concrete AC-13

2012 ◽  
Vol 450-451 ◽  
pp. 503-507 ◽  
Author(s):  
Xiu Hong Hao ◽  
Ai Qin Zhang ◽  
Wei Yang
Keyword(s):  
High Temperature ◽  
Calcium Carbonate ◽  
Dynamic Stability ◽  
Asphalt Concrete ◽  
Water Stability ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Residual Stability

To make nano calcium carbonate as the modifier, firstly the best proportion of nano calcium carbonate is determined as 6% by comparing the influences of different proportions of nano calcium carbonate to the indexes of asphalt. Then the influence of mixing with nano calcium carbonate to the performance of asphalt concrete AC-13 has been studied. Tests show that, the mixing of 6% nano calcium carbonate has improved the dynamic stability of asphalt concrete AC-13 from 991 times/mm to 1269 times/mm; the residual stability from 0.87 to 0.94. This indicates that after mixing with nano calcium carbonate, both the high temperature performance and water stability of asphalt concrete have been improved.

Distributed Strain Monitoring for Damage Evolution in CFRP Bolted Structures with Embedded Optical Fibers

2013 ◽  
Vol 558 ◽  
pp. 252-259 ◽  
Author(s):  
Nobuo Takeda ◽  
Shu Minakuchi ◽  
Takeyuki Nadabe
Keyword(s):  
Optical Fibers ◽  
Composite Structures ◽  
Large Scale ◽  
Permanent Deformation ◽  
Bolted Joints ◽  
Element Analysis ◽  
Internal Damage ◽  
Aerospace Applications ◽  
Strain Change ◽  
Distributed Strain

The authors proposed fiber-optic-based damage monitoring of carbon fiber reinforced plastic (CFRP) bolted joints. Optical fibers were embedded along bolt holes and strain change along the optical fiber induced by internal damage was measured by a Brillouin Optical Correlation Domain Analysis (BOCDA), which is a high spatial resolution distributed strain sensing system. This study began by investigating damage modes of CFRP bolted joints after bearing failure. Effective embedding positions of optical fibers were then proposed and their feasibility was evaluated by finite element analysis simulating the damage propagation in the bolted joint and consequent strain change. Finally, verification tests were conducted using specimens with embedded optical fibers at various positions. It was clearly shown that damage could be detected using residual strain due to fiber-microbuckling (kinking) damage or permanent deformation of neighboring plies. Furthermore, damage size and direction could be estimated from the change in the strain distribution. The system developed is quite useful for a first inspection of large-scale composite structures in aerospace applications.

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.

High-temperature performance of gilsonite-modified asphalt binder and asphalt concrete

2016 ◽  
Vol 34 (21) ◽  
pp. 1783-1789 ◽  
Author(s):  
Aliasghar Akbari Nasrekani ◽  
Koorosh Naderi ◽  
Mostafa Nakhaei ◽  
Nader Mahmoodinia
Keyword(s):  
High Temperature ◽  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Modified Asphalt Binder

High Temperature Performance, Reliability and Simulation of GaAs Mesfets with CVD Diamond Heat Sinks

1992 ◽  
Vol 260 ◽  
Author(s):  
L. Zhu ◽  
Pin F. Tang ◽  
A. Christou
Keyword(s):  
High Temperature ◽  
Thermal Characteristics ◽  
Temperature Stability ◽  
Cvd Diamond ◽  
Heat Sinks ◽  
Infrared Microscopy ◽  
Element Analysis ◽  
Temperature Performance ◽  
Thermal Measurements ◽  
Microscopy Techniques

ABSTRACTAn investigation of the temperature stability and high temperature characteristics of GaAs FETs on CVD diamond heat sinks was carried out by modeling the high temperature electrical characteristics for GaAs MESFETs and by experimentally measuring the elevated temperature performance. The thermal characteristics were determined experimentally using infrared microscopy techniques. The thermal measurements by infrared microscopy were correlated with results of a finite element analysis calculation of the GaAs FET thermal distribution. Reliability testing at 230°C resulted in an MTF of approximately 2000 hours.

scholarly journals Finite element analysis of bolt shear connection of steel-concrete composite structure

2020 ◽  
Vol 198 ◽  
pp. 01027
Author(s):  
Zhishun Pan
Keyword(s):  
Finite Element ◽  
Composite Structure ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Concrete Strength ◽  
High Strength ◽  
Shear Capacity ◽  
Simulation Software ◽  
Element Analysis ◽  
Shear Connectors

Bolted shear connectors are an important component to ensure that steel-concrete composite structures can work together. High-strength bolt shear connectors can replace traditional stud connectors because of their disassembly, good mechanical performance and fatigue resistance. It applied to steel-concrete composite structure. In order to study the influencing factors of the bearing capacity of high-strength bolted shear connectors, this paper uses ABAQUS finite element simulation software as a research tool to establish a reasonable finite element model to study the influence of bolt strength, bolt diameter and concrete strength on bolted shear connectors. Studies have shown that increasing the diameter, strength, and concrete strength of bolted connections can effectively increase the bolt’s shear capacity.

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