Utilization of Steel Slag as Aggregates for SMA-13

2015 ◽  
Vol 768 ◽  
pp. 402-405 ◽  
Author(s):  
Can Hua Li ◽  
Xiao Dong Xiang ◽  
Xian Xian Qin
Keyword(s):  
Steel Slag ◽  
Road Maintenance ◽  
Modified Asphalt ◽  
The Road ◽  
Water Permeability Coefficient ◽  
Mix Proportion ◽  
Asphalt Content ◽  
Useful Life ◽  
Marshall Stability ◽  
Sbs Modified Asphalt

A new method to make SMA is developed by using SBS modified asphalt when the coarse aggregate steel slag and the fine basalt aggregate are selected respectively. The Mix Proportion is 1#(16-9.5mm, steel slag):2#(9.5-4.75mm, steel slag):3#(3-4.75mm, basalt):4#(3-0mm, basalt):5# (mineral powder)=38%:36%:8%:8%:10%.The optimal asphalt content (OAC) is 6.4%. The mass percentage of steel slag is reached 74%. The costs of this kind of high quality road material can be saved because the amount of asphalt is not increased. Based on Marshall Stability and Splitting Strength test, it is shown that the Marshall stability of SMA is 10.6 kN, dynamic stability is 7800, and tensile strength ratio is 89.2%. All above test values are superior to the standards in China's traffic regulations. The water permeability coefficient of SMA is 65, which means that SMA has an excellence Wear-Resistant performance. Therefore, SMA can increase the road useful life and reduce the road maintenance costs.

Utilization of Steel Slag as Aggregates for OGFC-13

2014 ◽  
Vol 1081 ◽  
pp. 284-291 ◽  
Author(s):  
Xu Lin Zhou ◽  
Hao Bo Hou ◽  
Can Hua Li ◽  
Wei Xin Wang ◽  
Min Zhou
Keyword(s):  
Steel Slag ◽  
Polyester Fiber ◽  
Fine Aggregate ◽  
Road Maintenance ◽  
Scattering Loss ◽  
The Road ◽  
Water Permeability Coefficient ◽  
Run Off ◽  
Asphalt Content ◽  
Marshall Stability

We propose a new method to make OGFC-13. By this method we select steel slag as coarse aggregate (whose diameter is bigger than 4.75mm) and limestone as fine aggregate, using the SBS modified asphalt to make OGFC-16. The Mix Proportion is 1#(19-13.2mm,steel slag):2#(13.2-9.5mm, steel slag):3#(9.5-4.75mm, steel slag):4#(4.75-0mm, limestone):mineral powder=13%:28%:45%:13%:1%. The optimal asphalt content (OAC) is 4.5%, the polyester fiber content is 0.3%, and the steel slag content reaches 86%. The increase of the amount of asphalt and polyester fiber doesn’t help to save costs. When the asphalt content is optimum, the run-off loss and Cantabro scattering loss satisfy the Chinese regulatory requirements. By Marshall Stability test, we find that the Marshall stability of OGFC-13 reaches 9.8kN, superior to China's traffic regulations. The water permeability coefficient of OGFC-13 is 37.0, which means that OGFC-13 has a strong water seepage performance. In a word, OGFC-13 made by our method can guarantee the driving security of the long-term use of the road and save a lot of road maintenance costs.

Effects of 1,2-Dihydro-2,2,4-Trimethyl-Quinoline (TMQ) Antioxidant on the Marshall Characteristics of Crepe Rubber Modified Asphalt

2021 ◽  
Vol 876 ◽  
pp. 39-44
Author(s):  
Bahruddin ◽  
Arya Wiranata ◽  
Alfian Malik
Keyword(s):  
Natural Rubber ◽  
Asphalt Mixture ◽  
Test Results ◽  
Mixing Process ◽  
Rubber Content ◽  
Modified Asphalt ◽  
The Road ◽  
Asphalt Content ◽  
Marshall Stability ◽  
Rubber Product

The use of natural rubber-like crepe rubber as an asphalt additive is very susceptible to aging. Aging on asphalt crepe rubber can occur during the mixing process or its use for the road. Studies on the prevention of aging on asphalt are still being developed to produce asphalt resistance to aging and have good performance in preventing deformation. Some studies that have been done are the addition of other additives such as antioxidants. This study aims to study the effect of adding crepe rubber and the antioxidant 1,2-dihydro-2,2,4-trimethyl-quinoline (TMQ) to the Marshall characteristics of rubber asphalt. Preparation of the rubber asphalt sample begins with making crepe rubber, which is by milling raw natural rubber in the form of a cup lump using a creeper. The crepe rubber product contains dry rubber content of more than 95%. Then the crepe rubber masticated using an open mill to soften and form it with 2 mm thickness. Then the crepe rubber is melted at 200 °C before being mixed with asphalt, heated to 165 °C. The crepe rubber content in the asphalt mixture is made 10%, and during the mixing process, the TMQ was added with contents of 0%, 1%, 2%, 3% w/w. The rubber asphalt samples were then tested for their penetration and marshall characteristics, using ASTM D5 and ASTM D6927 standards. The test results show that the addition of the TMQ can improve the penetration properties and stability of the rubber asphalt in holding the load. However, the addition of the TMQ of more than 2% causes a decrease in the rubber asphalt's stability properties. The best results were obtained by adding 2% TMQ with 68.7 dmm penetration and optimum asphalt content of 5.50%. Results of the marshall test for the sample are marshall stability 1403.96 kg, void filled aggregate (VFA) 75.90%, void in a mixture (VIM) 3.07%, void mineral aggregate (VMA) 15.34%, flow 3.370 mm, and marshall quotient (MQ) 420.8 kg/mm.

Application of Stress Absorbing Layer in Project

2014 ◽  
Vol 587-589 ◽  
pp. 1095-1099
Author(s):  
Hai Zhan Li
Keyword(s):  
Mix Design ◽  
Construction Technology ◽  
Aggregate Gradation ◽  
Modified Asphalt ◽  
Asphalt Mix ◽  
Asphalt Content ◽  
Cracking Mechanism ◽  
Absorbing Layer ◽  
S Model ◽  
Sbs Modified Asphalt

To study the anti-cracking mechanism of stress absorbing layer. This paper, which determines the parameter of the sand asphalt mix design of AC-5 and proceeds the mix design, is based on Xinyang freeway (The bid section 1 of Huazhuang-Xincai section). Asphalt content is tested by ignition oven asphalt content test.Screening aggregate recovered from ignition oven asphalt content test .Using roughness, thickness, compaction in field evaluation.The results show that the positive S model of aggregate gradation and reasonable construction temperature and construction technology are contributed to anti-cracking of stress absorbing layer.The impermeable SBS modified asphalt stress absorbing layer could prevent the base and subgrade from eroding.

The Influence of Different Asphalt on the Comprehensive Performance of ATB Mixture

2015 ◽  
Vol 744-746 ◽  
pp. 1527-1530
Author(s):  
Fang Rui ◽  
Lei Hua
Keyword(s):  
Design Method ◽  
Low Grade ◽  
Modified Asphalt ◽  
The Road ◽  
Stability Performance ◽  
Temperature Performance ◽  
Higher Temperature ◽  
Relationship Of ◽  
Sbs Modified Asphalt ◽  
The Relationship

By comparing the study of 50# and 70# matrix asphalt and SBS modified asphalt to the influence law of high temperature performance, low temperature performance and water stability performance of ATB mixture, it can balance the relationship of the performance of every road in design method of ATB mixture. It suggests that we can use SBS modified asphalt in the condition of usually, use Low grade matrix asphalt or SBS modified asphalt in the condition of higher temperature requirements for the road , and use High grade matrix asphalt or SBS modified asphalt in the condition of the road in cold region.

scholarly journals Improve the Marshall stability of porous asphalt pavement with HDPE addition

2019 ◽  
Vol 276 ◽  
pp. 03005
Author(s):  
Elsa Eka Putri ◽  
Oliensia Vasilsa
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Good Choice ◽  
Annual Rainfall ◽  
Porous Asphalt ◽  
The Road ◽  
Maximum Stability ◽  
Asphalt Content ◽  
On The Road ◽  
Marshall Stability

Porous asphalt is a gap graded pavement that is 20% air voids which enables rainwater that falls on the road surface to flow through the pavement and into drainage on the side of the road. Porous asphalt has a high shear resistance and dries quickly but its stability is low, it is costly to maintain and needs replacing after only a short time. Despite these disadvantages, porous asphalt is still a good choice in area that experiences heavy annual rainfall. High Density Polyethylene (HDPE), an opaque plastic, is harder and stronger than porous asphalt with a tensile strength of 3100-5500 psi. It is resistant to high temperatures. This study aims to investigate the effect of various percentages of HDPE as an additive to produce an HDPE Asphalt Binder for porous asphalt pavement. Marshall parameters were determined based on the AAPA 2004 standard. It was found that 4% HDPE achieved a maximum stability value of 870 kg at the optimum asphalt content for porous asphalt pavement was 5.54%. Stability of porous asphalt pavement with optimum asphalt content value was 61.1% higher after the addition of HDPE. Thus, the use of HDPE as an additive in Asphalt Binder was able to increase the binding strength of the asphalt minimising the disadvantages of the low stability of traditional porous asphalt pavement.

scholarly journals High and Low-Temperature Performance Evaluation and Microanalysis of SMCSBS Compound-Modified Asphalt

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 771
Author(s):  
Yu Sun ◽  
Dongpo He
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Asphalt Mixture ◽  
Modified Asphalt ◽  
The Road ◽  
Temperature Performance ◽  
Creep Stiffness ◽  
Low Temperature Performance ◽  
Styrene Butadiene ◽  
Sbs Modified Asphalt

The mixture of styreneic methyl copolymers (SMCs) normal temperature-modified asphalt and styrene-butadiene styrene block copolymer (SBS)-modified asphalt (SMCSBS) compound-modified asphalt was investigated in this study. The viscosity and temperature properties of compound modified asphalt (SMCSBS) were studied by Brookfield rotary viscosity test. Dynamic shear rheometer (DSR) and bending beam rheometer (BBR) were used to test SMCSBS compound modified asphalt with different SMC additions. Finally, the microstructure and physicochemical properties of SMCSBS were evaluated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), and the modification mechanism of the SMCSBS was studied. The results show that the viscosity of the compound-modified asphalt added with SMC is improved, which is conducive to improving its workability. With the increase of SMC content, the high-temperature performance of the compound modified asphalt firstly increases and then decreases with the increase of SMC content. When the content of SMC is 12%, its high-temperature performance is the best. Compared with SBS-modified asphalt, the SMCSBS has better low-temperature performance, and the creep stiffness S and creep rate m of the SMC with different content are better than that of SBS. Finally, the microcosmic characteristics show that the SMC can give full play to its characteristics and can be uniformly dispersed in SBS modified asphalt. SMC is essentially a surfactant, which can reduce the viscosity and construction temperature by changing the surface tension and surface free energy of asphalt molecules. The curing agent of epoxy resin is slowly cross-linked and cured after contacting with air to form a certain strength, thus improving the road performance of the asphalt mixture.

Effect of Temperature on Volumetric Parameters of Rubber Modified Asphalt Mixture

2014 ◽  
Vol 587-589 ◽  
pp. 1141-1144
Author(s):  
Xu Bing Bi
Keyword(s):  
Void Fraction ◽  
Linear Trend ◽  
Asphalt Mixture ◽  
Great Influence ◽  
Road Construction ◽  
Effect Of Temperature ◽  
Modified Asphalt ◽  
The Road ◽  
Sbs Modified Asphalt

In this study, contrasted rubber modified asphalt and SBS modified asphalt, the mixture of AC-13C, SMA-13 and AR-AC13 are used for compaction test in the range of 120~200 °C as to covering the actual road construction compaction temperature. It can simulated the road compaction performance.The results showed that the temperature is a great influence on the volume parameter of rubber modified asphalt mixture. In the range of 160~180 °C, the void fraction, VMA and VFA of modified asphalt mixture is not sensitive to temperature, improving mixing temperature is not meaningful to improve the quality of compaction. When the temperature dropped to below 160 °C, the VMA rise rapidly, VFA falling rapidly, the increase of void fraction also present a "linear" trend, at this stage to improve mixing temperature can improve the compaction quality.

scholarly journals Study on Properties of Drainage SBS Modified Asphalt Mixture with Fiber

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Zhenxia Li ◽  
Tengteng Guo ◽  
Yuanzhao Chen ◽  
Menghan Zhang ◽  
Qingyu Xu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Three Dimensional ◽  
Basalt Fiber ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Modified Asphalt ◽  
The Road ◽  
Sbs Modified Asphalt

In order to improve the road performance of drainage SBS modified asphalt mixture, basalt fiber was added to prepare drainage styrene-butadiene-styrene (SBS) modified asphalt mixture. The viscosity-toughness, toughness, and 60°C dynamic viscosity of SBS modified asphalt were tested. The modification effect was evaluated from the perspective of high and low temperature rheological properties by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The high temperature stability, water stability, low temperature crack resistance, and drainage of basalt fiber SBS drainage asphalt mixture were evaluated and compared with nonfiber SBS drainage asphalt mixture and TPS drainage asphalt mixture. The morphology characteristics of asphalt mixture and the distribution of basalt fiber in the mixture were analyzed from a micro perspective. The results showed the following: the overall performance of basalt fiber is better than that of lignin fiber. SBS modifier content in 7% can meet the requirements of drainage asphalt pavement on asphalt binder. The optimum asphalt content of SBS modified asphalt mixture with basalt fiber content of 0, 0.15, 0.25, and 0.35% is 4.9, 5.05, 5.15, and 5.2%. The fiber is irregularly distributed in the mixture to form a three-dimensional network structure, which has a series skeleton function. It plays a tensile role in the initial cracking of asphalt mixture and prevents further expansion of cracks.

Study on Low-Temperature Performance of Asphalt Mixture Impacted by Modified Asphalt and Polyester Fibers

2012 ◽  
Vol 204-208 ◽  
pp. 3886-3889
Author(s):  
Xun Yu ◽  
Jing Bo Huang
Keyword(s):  
Low Temperature ◽  
Crack Resistance ◽  
Strain Energy ◽  
Failure Strain ◽  
Asphalt Mixture ◽  
Modified Asphalt ◽  
The Road ◽  
On The Road ◽  
Fracture Stiffness ◽  
Sbs Modified Asphalt

Low temperature crack plays an important role on the road safety and comfort. Indoor experiments were carried out to study the crack resistance of asphalt mixture. The results show that: fiber and SBS modified asphalt can increase the failure strain energy, the failure stress and the failure strain and reduce stiffness, thus can significantly improve the anti-cracking ability at low temperature; at a critical temperature of about -10°C, the splitting strength achieve a peak value correspondingly, and the asphalt mixture transforms from the viscoelastic status to the brittle status; the failure load and the failure strain of the three kinds of mixtures are in the sequence of modified asphalt mixture> fiber mixture> common asphalt mixture; the results of the J-integral strain energy test show that fiber asphalt mixture has the maximum resistance curve slope, which means it may have better anti-cracking ability than the SBS modified asphalt mixture; the fracture stiffness can be introduced to effectively evaluate the crack resistance of asphalt mixture.

Effect of Different Media Aqueous Solution on Road Performance of Asphalt Mixtures

2018 ◽  
Vol 913 ◽  
pp. 1070-1075 ◽  
Author(s):  
Xue Mei Zhang ◽  
Ling Pang ◽  
Shao Peng Wu ◽  
Guo Fu Zhang
Keyword(s):  
Aqueous Solution ◽  
Tensile Strength ◽  
Low Temperature ◽  
Salt Solution ◽  
Asphalt Mixtures ◽  
Modified Asphalt ◽  
Freeze Thaw ◽  
The Road ◽  
Road Performance ◽  
Sbs Modified Asphalt

Servicing in the natural environment, asphalt pavement is often exposed to the various aqueous solution, however, the effect of different media aqueous solution on road performance of asphalt mixtures remains ambiguous. In this study, the influences of water, acid, alkali and salt solution on volume of air voids (VV), tensile strength rate (TSR), low temperature performance of 70# asphalt mixtures and SBS modified asphalt mixtures were investigated through freeze-thaw cycles test, void ratio test, Lottman test and Three-point Bending Fracture (TBF) test. The results indicated that freeze–thaw cycles influenced the road performance of asphalt mixtures significantly, increased the air void of asphalt mixtures, and reduced tensile strength ratio and failure strain of asphalt mixtures. Compared with the distilled water, the damage of acid, alkali and salt solution on the road performances of asphalt mixtures were more serious, especially alkali solution to tensile strength rate and failure strains in low temperature, and salt solution to VV. The moisture corrosion resistance of SBS modified asphalt mixtures is better than that of 70# asphalt mixtures.

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