scholarly journals Effect of Short-Term Aging Process on the Moisture Susceptibility of Asphalt Mixtures and Binders Containing Sasobit Warm Mix Additive

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Bo Li ◽  
Jinyu Yang ◽  
Xiaohui Li ◽  
Xiang Liu ◽  
Feng Han ◽  
...  
Keyword(s):  
Aging Time ◽  
Sessile Drop ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Moisture Susceptibility ◽  
Freeze Thaw ◽  
Splitting Test ◽  
Marshall Test ◽  
Key Issues ◽  
Marshall Stability

Moisture susceptibility is one of the key issues of warm mix asphalt (WMA). In this research, the moisture susceptibility of asphalt mixtures and binders containing Sasobit warm mix additive was investigated in comparison to that of hot mixture asphalt (HMA) through laboratory aging experiments. The WMA asphalt mixtures were aged in the laboratory at three aging temperatures and times. The moisture susceptibility of the asphalt mixtures was measured through the laboratory immersed Marshall test and freeze-thaw splitting test. The surface free energy (SFE) of asphalt binders extracted from WMA asphalt mixtures was determined by the sessile drop method. The results show that the aging time and temperature have a significant effect on the improvement in moisture susceptibility in terms of both the freeze-thaw splitting strength ratios and the residual Marshall stability of asphalt mixtures containing Sasobit warm mix additive. The SFE of asphalt binders extracted from Sasobit warm mix increased with the aging time and temperature. The moisture susceptibility of the asphalt mixtures and binders containing Sasobit warm mixes was similar to or even greater than that of HMA aging under certain conditions.

Effectiveness of Loaded Wheel Tracking Test to Ascertain Moisture Susceptibility of Asphalt Mixtures

2021 ◽  
pp. 036119812110363
Author(s):  
Moses Akentuna ◽  
Louay N. Mohammad ◽  
Sanchit Sachdeva ◽  
Samuel B. Cooper ◽  
Samuel B. Cooper
Keyword(s):  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Creep Recovery ◽  
Moisture Susceptibility ◽  
Freeze Thaw ◽  
Wheel Tracking ◽  
Mixture Samples

Moisture damage of asphalt mixtures is a major distress affecting the durability of asphalt pavements. The loaded wheel tracking (LWT) test is gaining popularity in determining moisture damage because of its ability to relate laboratory performance to field performance. However, the accuracy of LWT’s “pass/fail” criteria for screening mixtures is limited. The objective of this study was to evaluate the capability of the LWT test to identify moisture susceptibility of asphalt mixtures with different moisture conditioning protocols. Seven 12.5 mm asphalt mixtures with two asphalt binder types (unmodified PG 67-22 and modified PG 70-22), and three aggregate types (limestone, crushed gravel, and a semi-crushed gravel) were utilized. Asphalt binder and mixture samples were subjected to five conditioning levels, namely, a control; single freeze–thaw-; triple freeze–thaw-; MiST 3500 cycles; and MiST 7000 cycles. Frequency sweep at multiple temperatures and frequencies, and multiple stress creep recovery tests were performed to evaluate asphalt binders. LWT test was used to evaluate the asphalt mixture samples. Freeze–thaw and MiST conditioning resulted in an increase in stiffness in the asphalt binders as compared with the control. Further, freeze–thaw and MiST conditioning resulted in an increase in rut depth compared with the control asphalt mixture. The conditioning protocols evaluated were effective in exposing moisture-sensitive mixtures, which initially showed compliance with Louisiana asphalt mixture design specifications.

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.

scholarly journals Moisture Susceptibility Evaluation of Asphalt Mixtures Containing Steel Slag Powder as Filler

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3211 ◽  
Author(s):  
Zhifeng Xiao ◽  
Meizhu Chen ◽  
Shaopeng Wu ◽  
Jun Xie ◽  
Dezhi Kong ◽  
...  
Keyword(s):  
Particle Size ◽  
Steel Slag ◽  
Asphalt Mixtures ◽  
Moisture Susceptibility ◽  
Freeze Thaw ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Split Test ◽  
Marshall Stability ◽  
Asphalt Mortar

The primary objective of this paper was to investigate the effect of replacing steel slag powder (SSP) with limestone filler (LF) with different contents as an inorganic anti-stripping agent on the moisture susceptibility of asphalt mixtures. Two traditional inorganic anti-stripping agents were selected for comparison, namely cement (CE) and slaked lime (SL). Apparent morphology, chemical compositions, and the particle size distribution of the four fillers were firstly studied. LF was replaced by SSP, CE, and SL with different contents, and then mixed with asphalt to prepare asphalt mortars. An 80 °C water immersion test was conducted to investigate the adhesion of asphalt mortar and aggregates, and an image analysis technique was utilized to evaluate the stripping of asphalt from the aggregates. A Marshall stability test and freeze-thaw split test were then conducted to analyze the effect of different fillers on the moisture susceptibility of asphalt mixtures. The results show that SSP contains a large amount of CaO, which indicates that SSP has a certain alkalinity. Compared with LF, SSP has a rougher surface texture and a finer particle size. Image analysis results show that the partially replacement of LF by SSP increases the asphalt coverage rate of aggregates, which means that SSP can improve the adhesion between asphalt mortar and aggregates. However, the excessive addition of SSP will result in a decrease in adhesion. The results of both the Marshall stability test and freeze-thaw split test demonstrate that CE, SL, and SSP can improve the moisture susceptibility of asphalt mixtures compared with the LF group, and that asphalt mixtures containing SSP have better moisture damage resistance than those with CE, but less such resistance than those with SL. With the increase of the amount of SSP replacing LF, the moisture susceptibility of the asphalt mixture decreases gradually. The optimum substitution amount of SSP was 25% of the total volume of fillers in this test.

Research of Road Application Performances of Asphalt Mixtures with Active Mineral Powder

2014 ◽  
Vol 599 ◽  
pp. 218-223
Author(s):  
Peng Cheng Yue ◽  
Pan Fei Liu ◽  
Jian Zhon Dong ◽  
Ping Ping Ding
Keyword(s):  
Dynamic Stability ◽  
Asphalt Concrete ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Test Machine ◽  
Splitting Test ◽  
Marshall Test ◽  
Mineral Powder ◽  
Failure Life ◽  
Marshall Stability

In this paper the effect of Active mineral powder (AMP) on the fundamental behavior of asphalt concrete especially in moisture damage was studied. Polycyclic Soaking Marshall test and freeze-thaw and splitting test were used to investigate the resistance of mixtures to moisture damage. Dynamic stability of mixture was evaluated by soaking rutting and the fatigue life of asphalts mixture with and without AMP was measured by universal test machine (UTM). After adding AMP, Retained Marshall Stability, Tensile Strength Ratio and dynamic stability value of asphalt concrete is higher than that of non-containing AMP asphalt concrete. The failure life of asphalt concrete increased as adding AMP. The results showed that the addition of AMP could improve the performance of failure life and resistance to moisture damage.

scholarly journals Performance Evaluation of Recycled Asphalt Mixtures Containing Construction and Demolition Waste Applicated as Pavement Base

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Le Ding ◽  
Junhui Zhang ◽  
Bowen Feng ◽  
Cheng Li
Keyword(s):  
Construction And Demolition Waste ◽  
Recycled Aggregates ◽  
Uniaxial Compression Test ◽  
High Temperature Stability ◽  
Demolition Waste ◽  
Recycled Asphalt ◽  
Freeze Thaw ◽  
Splitting Test ◽  
Marshall Test ◽  
Pavement Base

Construction and demolition waste contain large amount of concrete and bricks. To identify its feasibility of applying in asphalt stabilized gravel mixtures as pavement base, this paper carried out researches on properties of recycled asphalt mixture (RAM) by laboratory testing, under different contents of recycled aggregates (RA) and proportions of bricks to concrete. First, the basic physical properties of each component of the RAM were determined. According to the actual screening passing rate, the Bailey method was used to design and verify the grading of RAM, and then initial asphalt content was estimated. The stability, flow value, voidage, and bulk density were obtained by Marshall Test, and the optimal asphalt-aggregate ratios were determined under different RA contents and proportion of bricks to concrete. Subsequently, the uniaxial compression test, splitting tensile test, immersion Marshall test, freeze-thaw splitting test, and Hamburg rutting test were performed to investigate mechanical properties, water stability, and high-temperature stability of RAM. The results shows that as the content of RA increases from 0% to 100%, the corresponding compressive strength, resilient modulus, and splitting tensile strength all decrease; the same change trend is presented in the residual stability and freeze-thaw splitting test strength ratio and rutting depth. According to the requirement of pavement base of high-grade roads in China’s standards, the recommended RA content and proportion of bricks to concrete were proposed for the design RAM.

Experimental Study on Overlay Asphalt Mixture

2012 ◽  
Vol 253-255 ◽  
pp. 607-610
Author(s):  
Yu Qing Yuan ◽  
Wei Li ◽  
Xue Chan Li ◽  
Tao Guo
Keyword(s):  
High Temperature ◽  
Asphalt Mixture ◽  
Temperature Stability ◽  
Immersion Test ◽  
High Temperature Stability ◽  
Freeze Thaw ◽  
Passing Rate ◽  
Splitting Test ◽  
Marshall Test ◽  
Higher Temperature

To study the asphalt pavement performances on high temperature or its water stabilities, a series of tests, including high temperature stability test, immersion Marshall test, freeze-thaw splitting test, were finished. According to bailey method, initial quasi grading were calculated. Passing rate of 2.36 mm is respectively 36.3%, 33.1%, 36.1%, 38.7%, which is close to the initial quasi grading, namely 36%, 31.5%, 36%, 40%. Respectively at the test temperature of 60 °C, 68 °C, rutting tests were put forward. The results show that the mixture of gradation one has a higher temperature stability than the others in any case. Marshall immersion test and freeze-thaw test were conducted, optimizing with freeze-thaw splitting intensity ratio, which shows that the mixture of gradation one has a better water stability. To sum up, gradation one is recommended, designed by Marshall compaction molding with times of 100.

scholarly journals Influence of Natural Fibers on the Performance of Hot Mix Asphalt for the Wearing Course of Pavement

2020 ◽  
Vol 8 (2) ◽  
pp. 57-63
Author(s):  
Omar T. Mahmood ◽  
Sheelan A. Ahmed
Keyword(s):  
Tensile Strength ◽  
Hot Mix Asphalt ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Flexible Pavement ◽  
Asphalt Mixtures ◽  
Palm Fiber ◽  
Marshall Test ◽  
Indirect Tensile ◽  
Marshall Stability

Cracking in the flexible pavement is a serious problem that reduces the service life of the roads pavement unless they are treated with great care. Since flexible pavement is very weaker in tension than in compression, it is usually necessary to consider the tensile stresses and some type of additives to improve asphaltpavement performance, and one of the most effective ways of improving asphalt pavement performance is to reinforce asphalt mixtures by incorporating natural fibers. The main objective of this study is to use palm fiber, which is locally available, in hot mix asphalt mixtures. To achieve this objective, the Marshall test and indirect tensile strength test were conducted on four asphalt mixtures with different types of natural fibers (Coconut, Corn, Palm, and Sisal), added in varying percentages 0.1, 0.2, 0.3, 0.4, and 0.5% and different lengths of fiber 0.5, 1, 1.5, and 2 cm. Based on the analyzed results, it can be concluded that the use of palm fiber increased the Marshall stability by 20% as compared with the conventional mixture and raised up the retained tensile strength ratio up to 92%. Finally, the use of 0.2% content of natural fiber at 1.5 cm length gave a better performance for the mixtures.

scholarly journals Effects of Asphalt Binder Modifying with Polypropylene on Moisture Susceptibility of Asphalt Mixtures with Thermodynamically Concepts

2018 ◽  
Author(s):  
Gholam Hossein Hamedi ◽  
Ali Reza Azarhoosh ◽  
Mojtaba Khodadadi
Keyword(s):  
Free Energy ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Test Results ◽  
Cohesion Strength ◽  
Adhesion Bond ◽  
Moisture Susceptibility ◽  
Dry Conditions ◽  
Control Samples

In this study, the effect of using Polypropylene (PP) as an antistripping additive of asphalt mixtures is investigated. Here, the moisture susceptibility of asphalt mixtures is evaluated by determining the micro-mechanisms using the surface free energy (SFE) concept. The adhesion bond between the aggregate and asphalt binder and the cohesion strength of the asphalt binder are considered as the main factors that affect moisture damage of asphalt mixtures. Test results indicate that the use of PP improves the resistance of asphalt mixtures in both wet and dry conditions. Also, the results of the SFE tests showed that the modifying asphalt binder with PP increases free energy of adhesion that will improve adhesion resistance between asphalt binder-aggregates. The amount of debonding energy in the samples which are modified with PP is lower than the control samples. This shows that by modifying asphalt binders, the tendency of asphalt binder-aggregate stripping can be reduced. The results show the total SFE of the asphalt binders of the modified samples have more free energy rather than the control samples. This phenomenon shows that failure in the asphalt binder film and cohesion failure will be happened more rarely.

scholarly journals Effect of Rejuvenators on the Workability and Performances of Reclaimed Asphalt Mixtures

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6385
Author(s):  
Wei Tang ◽  
Xin Yu ◽  
Ning Li ◽  
Fuqiang Dong ◽  
Zhongyuan Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Stability ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Void Content ◽  
High Temperature Stability ◽  
Moisture Susceptibility ◽  
Reclaimed Asphalt ◽  
Air Void ◽  
Air Void Content

The use of rejuvenators has enhanced the workability of asphalt mixtures containing the reclaimed asphalt pavement (RAP). This conclusion is based on the determination of viscosity of asphalt binders, while not validated from reclaimed asphalt mixtures. In this study, the effect of two rejuvenators (ordinary and emulsified rejuvenator) on the workability of reclaimed asphalt mixtures was evaluated by measuring the mixing torque and determining the air void content of reclaimed mixtures. In addition, their effects on the performances of reclaimed mixture were studied via the three indexes tests, rutting test and freeze-thaw splitting tests. The experimental results show that mixing torque and air void content of reclaimed mixtures with the emulsified rejuvenator is 4% and 6% lower than that with the ordinary rejuvenator, respectively. This indicates that improvement of the workability of reclaimed mixtures can be achieved by using an emulsified rejuvenator, but not by an ordinary rejuvenator. That is also the reason that at least 20% greater high-temperature stability is found for reclaimed mixtures by using the emulsified rejuvenator than using the ordinary rejuvenator. In addition, reclaimed mixtures with the emulsified rejuvenator show similar moisture susceptibility to that with the ordinary rejuvenator. This study provides a feasible method to assess the workability effect of rejuvenators on reclaimed mixtures directly and recommends the use of an emulsified rejuvenator to improve the workability and high-temperature stability of reclaimed mixtures.

scholarly journals A Review of Nanomaterials’ Effect on Mechanical Performance and Aging of Asphalt Mixtures

2019 ◽  
Vol 9 (18) ◽  
pp. 3657 ◽  
Author(s):  
João Crucho ◽  
Luís Picado-Santos ◽  
José Neves ◽  
Silvino Capitão
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Economic Feasibility ◽  
Asphalt Binders ◽  
Aging Resistance ◽  
Marshall Stability

This review addresses the effects of the modifications with nanomaterials, particularly nanosilica, nanoclays, and nanoiron, on the mechanical performance and aging resistance of asphalt mixtures. The desire for high-performance and long-lasting asphalt pavements significantly pushed the modification of the conventional paving asphalt binders. To cope with such demand, the use of nanomaterials for the asphalt binder modification seems promising, as with a small amount of modification an important enhancement of the asphalt mixture mechanical performance can be attained. Several studies already evaluated the effects of the modifications with nanomaterials, mostly focusing on the asphalt binder properties and rheology, and the positive findings encouraged the study of modified asphalt mixtures. This review focuses on the effects attained in the mechanical properties of the asphalt mixtures, under fresh and aged conditions. Generally, the effects of each nanomaterial were evaluated with the current state-of-art tests for the characterization of mechanical performance of asphalt mixtures, such as, permanent deformation, stiffness modulus, fatigue resistance, indirect tensile strength, and Marshall stability. Aging indicators, as the aging sensitivity, were used to evaluate the effects in the asphalt mixture’s aging resistance. Finally, to present a better insight into the economic feasibility of the analyzed nanomaterials, a simple cost analysis is performed.

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