Research on Water Stability of Superpave Asphalt Mixture

2011 ◽  
Vol 94-96 ◽  
pp. 2175-2178
Author(s):  
Xue Dong Guo ◽  
Jian Cao ◽  
Xiang Yang Fang
Keyword(s):  
Water Content ◽  
Asphalt Pavement ◽  
Rapid Development ◽  
Highway Construction ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Water Stability ◽  
Saturated Condition ◽  
Maximum Water ◽  
Maximum Water Content

At present, the highway construction of China is in the stage of rapid development. A variety of asphalt mixtures have been applied to a certain extent in the highway construction. However, the water stability of asphalt pavement is also a serious problem to the highway. This research studies the water stability of a new kind of asphalt mixture—Superpave by changing the water content in different condition. The following conclusion can be found in this paper. In the normal saturated condition, the maximum water content of Superpave asphalt mixture is 0.35%.And in the vacuum saturated condition, the maximum water content of Superpave asphalt mixture is 1.78%.The water of Superpave asphalt mixture takes nine days to drain completely in the normal saturated condition. But in the vacuum saturated condition, the time is more than two months. In different water content conditions, the splitting tensile strength of Superpave asphalt mixture is 0%> 100%> 25%> 75%> 50%.

Study of Water Stability of AC and SMA Asphalt Mixture Based on Water Content

2012 ◽  
Vol 457-458 ◽  
pp. 435-438
Author(s):  
Xue Dong Guo ◽  
Cao Jian ◽  
Xiang Yang Fang
Keyword(s):  
Tensile Strength ◽  
Water Content ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Splitting Tensile Strength ◽  
Water Stability ◽  
Paper Study ◽  
Saturated Condition ◽  
Maximum Water ◽  
Maximum Water Content

In this paper，study water content and water stability of AC and SMA asphalt mixtures, and reach the following conclusions. In the normal saturated condition, the maximum water content of AC and SMA asphalt mixture is 0.28% and 0.32%.And in the vacuum saturated condition, the maximum water content of AC and SMA asphalt mixture is 0.8% and 0.78%.The water of AC and SMA asphalt mixture separately take 8 days and 9 days to drain completely in the normal saturated condition. But in the vacuum saturated condition, the time is more than two months. In different water content conditions, the splitting tensile strength of AC asphalt mixture is 0%> 100%> 25%> 75%> 50%.But the splitting tensile strength of SMA asphalt mixture is 0%> 100%> 25%> 50%> 75%.

Study of Water Stability of Asphalt Mixture Based on Residual Water

2011 ◽  
Vol 71-78 ◽  
pp. 1791-1794 ◽  
Author(s):  
Xue Dong Guo ◽  
Jian Cao ◽  
Xiang Yang Fang
Keyword(s):  
Asphalt Pavement ◽  
Highway Construction ◽  
Asphalt Mixture ◽  
Road Surface ◽  
Water Stability ◽  
Residual Water

At present, AC, a major gradation type of asphalt mixture, is widely used in highway construction in China. Due to internal large porosity, the water of road surface draining quickly, OGFC pavement is also widely used. However, water is easier flow into OGFC asphalt pavement than ordinary asphalt pavement. So the water stability of OGFC asphalt pavement is particular important. We get the following conclusion by the test of residual water and water stability based on the two gradations asphalt mixture of AC and OGFC. Residual water stays in AC asphalt mixture for about one week.While the residual water stays in OGFC asphalt mixture for more than three months. When the residual water is 50% in AC, the water stability is the worst. When the residual water is 75% in OGFC, the water stability is the worst.

Determining Optimum Carbon Nanotubes Content for Asphalt Mixture in Road Pavements

2021 ◽  
Vol 1023 ◽  
pp. 121-126
Author(s):  
Van Bach Le ◽  
Van Phuc Le
Keyword(s):  
Carbon Nanotubes ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Construction Cost ◽  
Asphalt Mixtures ◽  
Static Modulus ◽  
Pavement Construction ◽  
Modified Binder ◽  
Marshall Stability

Although small amount of binder in asphalt concrete mixture may commonly range from 3.5 to 5.5% of total mixture as per many international specifications, it has a significant impact on the total cost of pavement construction. Therefore, this paper investigated the effects of five carbon nanotubes contents of 0.05%, 0.1%, 0.15%, 0.2%, 0.25% by asphalt weight as an additive material for binder on performance characteristics of asphalt mixtures. Performance properties of CNTs modified asphalt mixtures were investigated through the Marshall stability (MS) test, indirect tensile (IDT) test, static modulus (SM) test, wheel tracking (WT) test. The results indicated that asphalt mixtures with CNT modified binder can improve both the rutting performance, IDT strength and marshall stability of tested asphalt mixtures significantly at higher percentages of carbon nanotubes. However, the issue that should be considered is the construction cost of asphalt pavement. Based on the asphalt pavement structural analysis and construction cost, it can be concluded that an optimum CNT content of 0.1% by asphalt weight may be used as additive for asphalt binder in asphalt mixtures.

Rubber Modified Asphalt Mixture Properties and Mechanical Testing

2011 ◽  
Vol 105-107 ◽  
pp. 810-817 ◽  
Author(s):  
Rong Hui Zhang ◽  
Jia Liu ◽  
Jian Chao Huang ◽  
Yi Fu
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Specimen Preparation ◽  
Twin Screw Extrusion ◽  
Modified Asphalt ◽  
Flexural Tensile Strength ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Compound Particle

To solve the high-temperature rutting problem of asphalt pavement, the old rubber of the tire rubber and plastic of general polyethylene waste composite modified asphalt mixture is proposed. The plastic and rubber compound particle was made by the rubber through efficient desulfurization additives, pre-swelling, twin-screw extrusion equipment. The particles mixed with the asphalt mixtures specimen preparation and the dynamic stability experiments, composite beam fatigue experiments, flexural tensile strength and modulus experiments and anti-reflective pavement cracks and other mechanical experiments are performed. The comparative data obtained by the rubber and plastic composited modified asphalt mixtures and SBS asphalt mixtures prove that the rubber and plastic composited modified asphalt mixtures have excellent rutting resistance and fatigue resistance.

The Analyses and Calculation for Thermal Stresses of SBR Modified Asphalt Pavement

2011 ◽  
Vol 243-249 ◽  
pp. 4112-4118
Author(s):  
Min Jiang Zhang ◽  
Gang Chen ◽  
Li Xia Hou ◽  
Li Ping Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Thermal Stresses ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
The Finite Element Method ◽  
Temperature Stresses ◽  
Modified Asphalt ◽  
Temperature Performance

Based on the viscoelasticity theory and the data of creep test, Burgers model was established, which was used to study the viscoelastic property of SBR asphalt mixtures, and the viscoelastic constitutive relation was obtained. Using the finite element method, the temperature stresses field was calculated under the environmental conditions and the thermal stresses of SBR modified asphalt pavement was given at the last part of this paper. The study indicated that SBR modified asphalt mixtures have the advantage over common asphalt mixture in low-temperature performance.

Water loss dynamics in maize hybrids with different genotypes

2005 ◽  
Vol 53 (2) ◽  
pp. 153-159 ◽  
Author(s):  
A. C. Dobos ◽  
G. Szabó
Keyword(s):  
Water Content ◽  
Water Loss ◽  
Environmental Parameters ◽  
Close Correlation ◽  
Water Dynamics ◽  
Maize Production ◽  
Grain Moisture ◽  
Maximum Water ◽  
The Individual ◽  
Maximum Water Content

Tests were made on the water dynamics of water loss in maize at two locations at major maize production areas, Debrecen and Szeged, as a function of the heat sum required up to physiological ripening. The maximum water content was found to vary according to the hybrid and the year. No significant differences were found between the effective heat sums associated with maximum values within a year, the difference being 2-4 calendar days. There was a close correlation between the maximum grain water content and the length of the generative phase for a given hybrid in a given year. Better water supplies (1998) resulted in higher maximum water content values, which indirectly promoted longer and more intensive dry matter incorporation. Of all the environmental parameters, the drying down rate is primarily determined by the temperature. The changes in grain moisture content in a specific hybrid can be characterised by a joint linear graph. The drying down rate of the individual hybrids was determined by examining the b term of the linear equation.

Study on Ice Breaking on Crumbed Rubber Asphalt Pavement Based on Self-Stress Method

2012 ◽  
Vol 256-259 ◽  
pp. 1807-1812 ◽  
Author(s):  
Qing Yi Xiao ◽  
Hong Jun Cui ◽  
Ning Li Li ◽  
Cai Li Zhang
Keyword(s):  
Elastic Modulus ◽  
Traffic Safety ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Highway Traffic ◽  
Friction Test ◽  
Rubber Content ◽  
Fem Method ◽  
The Relationship

Ice layer on pavement surface was a serious problem for highway traffic safety. Crumbed rubber asphalt mixture was an effective way to drive ice layer away from surface. Through wheel test asphalt mixture specimen with ice layer at negtive temperature, the paper studied ice breaking performance of asphalt mixtures containing different amount crumbed rubber. Pendulumlike friction test BPN after wheel test was taken as an performance index of crumber rubber asphalt breaking ice. Results shown that the quantity of crumbed rubber and the performance of ice breaking had good linear relationship and more rubber content had better slide resistance recover speed at same wheel arround number.Through numerial model of pavement covered ice based on FEM method, the paper had analyzed the relationship between elastic modulus of crumbed rubber pavement and ice stress-strain on pavement, and put forward the mechanism of ice breaking.

Research on the Road Performance of the AC-25 Asphalt Mixtures

2012 ◽  
Vol 204-208 ◽  
pp. 1593-1598
Author(s):  
Hong Mei Li ◽  
Wen Fang Liu
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Central Layer ◽  
The Road ◽  
Road Performance ◽  
On The Road

In this paper, firstly, based on asphalt pavement central layer, the comparison with the foreign related gradation of asphalt mixtures, one typical kinds of gradations are decided; Secondly, the asphalt aggregate ratio is predicted based on professor Lin’s Theory , and five asphalt aggregate ratio are selected. Finally, the road performance of asphalt mixture is experimented, and the road performance of five asphalt aggregate ratio is analyzed. As a result, we can predict the range of the optimum asphalt aggregate ratio based on the road performance.

Experiment Study of Water Stability of Fiber-Reinforced Asphalt Mixture

2011 ◽  
Vol 243-249 ◽  
pp. 710-716 ◽  
Author(s):  
Ying Chun Cai ◽  
Yuan Xun Zheng
Keyword(s):  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Asphalt Mixtures ◽  
Water Stability ◽  
Fiber Reinforced ◽  
Freeze Thaw ◽  
Optimum Dosage ◽  
Splitting Strength ◽  
Splitting Test ◽  
Marshall Test

To study the influence of fiber on the water stability of asphalt mixtures, the optimum dosage of asphalt and fibers are studied by the method of Marshall test and rut test. The results demonstrate that the optimum dosage of asphalt and fibers are 4.63% and 0.30%, respectively. Then the improved effects of basalt fiber on water stability of asphalt mixtures are evaluated through immersed Marshall test and freeze-thaw splitting test according to related specifications. The results show that the freeze-thaw splitting strength and splitting strength without freeze-thaw of fiber-reinforced asphalt mixture are improved to some extent compared with control mixture. Splitting strength without freeze-thaw of basalt, polyester and xylogen fiber-reinforced asphalt mixture is increased by 36.4%, 15.4% and 6.2%, and freeze-thaw splitting strength is increased by 55.2%, 28.7% and 14.5%. It can be concluded that fiber can remarkably improved the water stability of asphalt mixtures, besides; the improvement effects of basalt fiber are superior to polyester fiber and xylogen fiber.

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