جستجوی مقالات مرتبط با کلیدواژه « moisture susceptibility » در نشریات گروه « عمران »

The construction industry produces substantial amounts of waste materials, which contribute to negative environmental impacts when disposed of in landfills. Recycling Construction and Demolition Waste (CDW) as secondary materials is an effective approach to reducing these negative effects. Recycled Concrete Aggregates (RCA) derived from distressed pavements, buildings, and concrete structures have potential for a variety of applications, including in asphalt mixes. This paper reports experimental research on the use of treated and untreated RCAs in preparing Hot Mix Asphalt (HMA). RCA materials were added in both treated and untreated form to HMA mixes. To improve the quality of recycled mixes, RCAs were treated with lime solutions. In order to improve quality of recycled mixes, RCAs were treated with lime solutions before that the recycled mixes were subjected to various tests. The treatment was applied to coarse RCA materials. The coarse RCAs were washed thoroughly, so that all noticeable impurities, including wood chips and other similar materials, were removed. These were then dried at ambient temperature for 24 h before that the treatment was applied. In order to reduce stripping susceptibility of the recycled asphalt mixtures, hydrated lime was added as a treatment additive. The addition of hydrated lime solution was beneficial due to, its abundance the convenience of application in HMA mixes. RCAs were impregnated in a 6% solution of hydrated lime for 24h at ambient temperature. Then these were dried at ambient temperature before being used in asphalt mixes. The physical and mechanical characteristics of the treated/untreated RCAs were determined. Asphalt mixtures were prepared that contained 25% and 50% RCAs of the size ranging from 4.75 to 12.5 mm. Various asphalt mixtures containing different amounts of RCAs were prepared. Moisture susceptibility of HMA mixes were evaluated using indirect tensile strength test (ITS). Fracture properties of mixes applying Semi-Circular Bending (SCB) were determined. SCB testing was performed according to ASTM D 8044 Standard testing method. Samples were prepared containing three different notches of 25, 32, and 38 mm. SCB samples were tested using a UTM machine. The loading mode as in monotonic compression at the speed of 0.5 mm/min. J-integral suggests as a criterion for resistance of materials to cracking. Testing was performed on HMA mixes treated and untreated samples. The results indicated that although treating RCAs might require more effort in production processing, significant benefits result in reducing moisture susceptibility and increasing fracture toughness of samples. It was also found that replacing virgin aggregates with RCA, improved fracture properties of HMA mixtures. The results indicated that with using RCA instead of conventional aggregates in asphalt mixes, has positive benefits for the environment and enhanced mechanical properties of HMA mixtures. A limited percentage of RCAs can be used in asphalt mixtures without significantly affecting performance of asphalt mixtures. The treatment resulted in reduced water absorption and increased fracture energy of mixes. Asphalt mixes containing 50% untreated RCA materials showed some moisture susceptibility while asphalt mixes containing 50% treated RCA showed improved moisture resistance. In conclusion, the study demonstrated that treating RCAs with hydrated lime solution improved the moisture susceptibility and fracture resistance of recycled HMA mixtures. Furthermore, utilizing recycled construction materials as secondary materials in asphalt mixes has significant environmental benefits. Future research can explore the potential use of various waste materials, including RCAs, in asphalt mixes.

An efficient approach to road safety coupled with preventive maintenance of asphalt pavements is the application of colored slurry seal, as it improves the road visibility while enhancing the aesthetic aspects of the urban space. Around the globe, application of colored surface treatments on roads has witnessed a growth in recent years, especially in urban areas. This study aims at investigating the feasibility and effectiveness of using electric-arc furnace steel slag as an alternative to natural aggregates in the colored slurry seal mixture design followed by a performance assessment of the resultant mixture. For this purpose, first, characteristics of the aggregate and steel slag were investigated. Next, performance of the designed slurry seal mixture was assessed by testing five different mixtures containing the slag at 0, 10, 20, 30 and 40 wt.%. Evaluation and comparison of the asphalt specimens were performed by conducting 30- and 60-min wet cohesion tests, 60-min wet track abrasion test, loaded wheel-sand adhesion test, and loaded wheel-displacement test according to ASTM D3910. Based on the XRF results, the considered steel slag powder contained a significant amount of calcium oxide (~ 57% of natural aggregate). The high CaO/SiO2 ratio for the steel slag indicates its alkalinity, which suggests its improved adhesion to bitumen thanks to its rather acidic nature. According to FESEM results, the steel slag material was found to be composed of particles of angular geometry with a rougher surface and higher porosity than natural aggregates, further indicating better slag-bitumen adhesion. Performance assessments indicated superior performance of the steel slag-containing specimens of colored slurry seal. Among the studied mixtures, the one with 40 wt.% steel slag exhibited the best performance, as shown by 27.8 and 37.3% increase in the mixture cohesion upon 30- and 60-min wet cohesion tests, respectively, as compared to the control specimen. Furthermore, 47.7% lower moisture sensitivity and 50.8% and 40% smaller vertical and lateral displacements, respectively, were observed for the slag-containing mixture. The bleeding potential of the mixtures decreased with increasing the steel slag dosage from 0 to 40 wt.%, so that the mixture containing steel slag at 40 wt.% exhibited 23.7% lower bleeding potential. Trying to optimize the asphalt emulsion dosage, it was figured out that the optimal content of asphalt emulsion increases with the added content of steel slag to the mixture. Accordingly, the mixture containing steel slag at 40 wt.% required 1.9% more asphalt emulsion to achieve a given cohesion level within a certain time. Based on the results of this research, in order to improve performance characteristics of colored slurry seal mixtures while observing environmental obligations, it is recommended to use steel slag as an alternative to natural aggregates in this type of surface treatment. Therefore, according to the environmental issues and the limitations of natural resources, it is recommended that steel slag be replaced by natural aggregates up to 40% in the colored slurry mixture. By replacing steel slag, proper adhesion and cohesion between asphalt mixture materials is achieved and its resistance to moisture sensitivity, traffic loading and bleeding is improved.

Due to the problems of high cost, difficult processing and unfavorable storage stability of bitumen modified with 1SBS, a lot of research has been done on composite bitumen to achieve superior pavement performance. In this study, the asphalt mixture was modified by nanosilica, gilsonite and SBS. Asphalt binder main performance tests, rutting tests, low temperature bending tests, moisture sensitivity tests, fatigue tests, and durability tests of asphalt mixture modified with SBS, gilsonite, nanosilica/rock asphalt, and nanosilica/ gilsonite/SBS were conducted to determine the performance Their structure should be evaluated. By comparing the results of the tests with the properties of the unmodified asphalt mixture, nano-silica and stone asphalt led to the improvement of the structure performance. The modified asphalt mixture with nanosilica/gilsonite/SBS had higher stability temperature, low temperature cracking resistance, lower moisture sensitivity, and longer durability than asphalt binder modified with 5% SBS, except for similar fatigue life.

Coarse recycled concrete aggregates have weaker mechanical and physical properties than natural aggregate because of the porous and flimsy cement mortar.Hence, using coarse recycled concrete aggregate in the asphalt mixtures decreases their resistance to different failures. Therefore, in this research, in order to reduce the permeability and increase the resistance of adhered cement mortar, coarse recycled concrete aggregate was modified by two chemical (coating their surfaces using styrene butadiene rubber polymer) and physical (separation of cement mortar using heating) methods. The results of the dynamic creep test also show that employing coarse recycled concrete aggregate increases permanent deformation in the specimens under test because the asphalt mixture stiffness is decreased. But asphalt mixtures containing treated coarse recycled concrete aggregate have less permanent deformation because the styrene butadiene rubber polymer with the penetration into the void of coarse recycled concrete aggregate and reinforcing cement mortar, as well as removing the cement mortar by heat, increases their stability. Also, asphalt mixtures containing coarse recycled concrete aggregate have a lower fatigue life compared to the control mixture, and chemical modification of aggregates has been more effective in increasing the fatigue life of the mixtures containing them compared to the physical method. In addition, the results show that the presence of moisture reduces the resistance of controlled and modified asphalt mixtures against moisture damage, and this reduction is greater in mixtures containing coarse recycled concrete aggregate due to their high absorption.

Thermal cracking and moisture sensitivity are two of the most important failures that face asphalt pavement with serious threats during the operation period. In this research, the effect of nano CaO and nano CaCO3 additives to HMA has been evaluated in order to improve their performance against cracking and moisture sensitivity. In order to achieve the goals of this research, bitumen was mixed with 0.9% of nano CaCO3 and 1.5% of nano CaO, and to evaluate the functional characteristics of HMA samples containing nano additives, semicircular bending (SCB) tests were performed in three The temperature was -5, -10 and -15 °C, and modified Latman was performed at two temperatures of 10 and 20°C. According to the SCB and ITS test results, the best performance and the highest resistance is related to the sample containing 1.5% Nano CaO, which is about 22% more resistant to thermal cracks and about 6% less sensitive to moisture than the control sample. Based on the SCB test results, it can be seen that with the increase of Me from zero to about 0.4-0.6 when the loading is a tensile-shear combination, the fracture toughness will decrease and then increase when the loading goes to pure tension. Such that the greatest resistance to cracking occurs in pure tension.

The non-renewability of natural materials and the prevention of environmental degradation for the production of stone materials, has increased the tendency to use waste materials in asphalt mixtures in recent decades. Several research studies were conducted to assess WMA mixtures' mechanical properties containing Reclaimed Asphalt Pavement (RAP), Electric Arc Furnace Slag (EAFS), and waste plastic (WP) separately. However, very scarce studies assessed the influence of the simultaneous presence of RAP, EAFS, and waste plastic on the mechanical properties and moisture susceptibility of WMA mixtures. This research investigates the effects of simultaneous recycling of RAP, EAFS, and waste plastic into the WMA mixtures to remove these barriers. Mechanical properties of WMA mixtures containing different percentages of RAP (0%, 35%, and 55%, fine aggregate replacement), EAFS (0%, 20%, and 40%, coarse aggregate replacement), and waste plastic (0%, and 10% bitumen weight) were evaluated using compressive strength, resilient modulus, static creep, Marshall quotient, and moisture susceptibility tests. Sasobit uses 1.5% of the total asphalt mass to prepared WMA mixtures. The results of this study were shown to improve the moisture sensitivity, rutting resistance, and resilient modulus by increasing the percentage of RAP and also reduce the resistance to moisture sensitivity and improve the compressive strength of mixtures by increasing the percentage of EAFS and decreasing the compressive strength and resilient modulus by increasing waste plastic. The simultaneous use of EAFS, RAP, and waste plastic seems to produce an environmentally-friendly mixture with minimum mechanical properties.

With the increasing use of asphalt roads, it is necessary to design and produce asphalt pavements that can withstand various damages such as rutting damage, cracking, and moisture damage. The use of nanomaterials due to their excellent and unique features in the asphalt pavement industry to improve the mechanical properties of asphalt has welcomed broad attention in recent years. This study examined the impacts of Nano Reduced Graphene Oxide (RGO) on the mechanical properties of stone mastic asphalt mixture (SMA). In this study, indirect tensile strength test, static creep test, and Pull-off adhesion test were used to investigate the effect of Nano reduced graphene oxide on the mechanical properties of SMA mixture. The pure asphalt binder was modified with three different percent of Nano RGO (0.2 %, 0.4 %, and 0.6 % by weight of bitumen used in asphalt samples in this study). The experiments performed on modified bitumen in this study show that the addition of Nano reduced graphene oxide in pure bitumen raises the viscosity, softening point, and specific gravity and reduces the ductility and penetration of pure bitumen. The mechanical tests showed that augmenting the percentage of Nano reduced graphene oxide leads to increased indirect tensile strength, pull-off adhesion resistance, accumulated strain, reduced creep stiffness, and improved moisture sensitivity in stone mastic asphalt mixture. In general, 0.6% of this nanomaterial caused more significant changes in the mechanical properties of SMA mixtures than other amounts of Nano-reduced graphene oxide. So that adding 0.6% of this additive in the asphalt mixture has increased the TSR index by 23%, increased the pull-off adhesion resistance in the wet condition by 48%, and reduced the creep stiffness by 43% compared to the control mixture.

WMA mixes, compared with HMA mixes, are environmental friendly mixes that produce little air pollutants and greenhouse gases. Their high energy saving costs resulted in their extensive use in construction projects. However, these warm mixes recognized to be susceptible to moisture damage that results in stripping distress in pavements. In this research, WMA mixtures were prepared applying two different methods; namely, application of an organic additive (Sasobit) and adoption of foam bitumen technique. In this latter, small amount of water is inserted together with high pressure air into Wirtgen, WLB-10 machine One of the methods of solving moisture damages is to use anti-stripping additives to increase adhesion properties between bitumen and aggregate particles. In this research, two types of additives; namely, hydrated lime (at 1.5, 2 and %2.5 by weight of aggregates) and Zycotherm (at 0.1, 0.2 and %0.3 by weight of bitumen), were used to reduce moisture sensitivity of Warm Mix Asphalt (WMA). To evaluate moisture susceptibility of WMA mixes, Indirect Tensile Test, boiling water, and Pull Off testing were preformed. The experimental results showed positive effects of hydrated lime and zycotherm anti-stripping additive in reducing moisture sensitivity of WMA mixes. The testing results showed that WMA mixtures that were prepared applying foam bitumen techniqe were more sensitive to moisture damage than WMA mixtures that were prepared by organic additive (Sasobit). As conclusion, results indicated that the mixes containing %2.5 hydrated lime (by weight of aggregates) and %0.3 zycotherm (by weight of bitumen) are the optimum contents of addetives for reducing moisture sensitivity. Moreover, the results indicate that zycotherm additive has a greater effects on redusing moisture sensitivity compared to hydrated lime.

In recent years, the use of warm asphalt technology and reclaimed asphalt pavement (RAP) has been extensively used to reduce the costs of pavement construction, as well as to protect the environment. Nonetheless, concern about moisture susceptibility is an important issue related to warm asphalt mixtures. In this study, we examined the effect of different percentages of RAP on the moisture susceptibility of warm asphalt mixtures containing Zycotherm as a nano-chemical additive. Two types of aggregates including siliceous and calcareous minerals (which have been shown to be have different performance characteristics against moisture damages) were used in the production of warm asphalt mixtures. A total of 48 samples of asphalt mixture containing different percentages (15, 30 and 45 percent) of RAP were evaluated. Indirect tensile strength test (ITS) and Texas boiling test were carried out to investigate the moisture susceptibility of samples. Results demonstrated that addition of RAP to both types of aggregates increased the moisture susceptibility of the mixture. Experiments showed that adding 45 percent of RAP resulted in 19 and 23 percent reduction in TSR for the mixtures containing siliceous and calcareous aggregates, respectively, which was corresponding to 30 and 25 percent stripping of aggregate-asphalt mixtures in siliceous and calcareous aggregates, respectively.

Cross-Linked Polyethylene (XLPE) is a type of insulation for high-voltage cables that is widely used in electrical cable coatings because of its good thermal and electrical resistance properties. Due to lack of appropriate technology for XLPE recycling, incineration and burial methods are mainly used for the waste of these materials. In this study, XLPE wastes were used as a substitute for fine aggregates of porous asphalt mixtures. For this purpose, 25, 50 and 75% volumes of the 2.36 to 4.75 mm aggregates were replaced with the same size XLPE particles. Optimal asphalt percentage was estimated by the mixture’s air voids percentage and Cantabro tests. In the next step, the performance of the samples was evaluated by modified Lottman, Cantabro on aged samples and asphalt drain down tests. The results showed that XLPE particles, due to their low absorption capacity, can enhance the resistance of porous asphalt mixtures to moisture damage. The evaluations also revealed that specimens which 25% aggregates between 2.36 to 4.75 of them replaced with XLPE, had the best performance compared to control and other specimens containing XLPE.

The aim of designing the roads and airports is to provide a structural composition on the path of motion to transport traffic in a safe, uniform and efficient way and as a result of increasing the traffic load and increasing the load on the axles and procedures, the necessity of design and implementation of stronger asphalt layers is critical to the various failures including moisture sensitivity and rutting phenomenon (as a common phenomenon in the rutting layer failure). In this study, the additives effect of SBS (% 3 and 5 %) and Lucobite (3 % and 5 %)on the performance of the asphalt mixed with the skelton of aggregates (SMA)was investigated. Marshall " s resistance tests, indirect tensile strength, resilient modulus, moisture susceptibility test (using an indirect tensile test and resilient modulus in two dry and wet conditions and Texas boiling test)were conducted to investigate the dynamic and temporal creep of the Hamburg wheel to investigate the behavior of SMA mixtures. The results showed that with the increase of polymeric additives, decrease of penetration rate and softening point were increased. The study of the results of experiments and image processing of boiling water test photographs showed that polymer additives improved the mixed resistance to moisture. Results of dynamic creep test show that by increasing the polymer additives the resistance of specimens is increased. As such, the samples containing 5 % of the SBS had the highest resistance to rutting. Also, the results showed that by increasing the polymer additives the resistance of the samples is increased.

As a new way of modifying asphalt or asphalt mixture, composite modification has obvious effects. In order to improve the perfor- mance of asphalt pavement in a simple, fast and efficient way, a new kind of composite reinforcing material (CRM) is used in this study. The Marshall Immersion test, the freeze–thaw splitting test and low-temperature bending test were conducted to evaluate the pavement performance of the asphalt mixture with different CRM contents. Test results show that the pavement performance of modified asphalt mixtures is better than unmodified asphalt mixture. When the CRM content increases, resistance to rutting at a high temperature increases significantly, low temperature cracking resistance and moisture damage resistance first rise and then fall. In consideration of other pavement performance, such as dynamic stability (DS), indirect tensile strength ratio (TSR) and maximum tensile strain, the sug- gested optimal CRM dosage is 5.9‰ to 7.9‰.

One of the important benefits of using warm-mix asphalt is to reduce the asphalt production temperature, but this is also generating a pavement problem such as a higher moisture potential, due to the lower production temperatures, all moisture in the aggregate does not evaporate, subsequently. The purpose of this study is to evaluate the effect of zycotherm on the moisture susceptibility reduction in warm-mix asphalt. In addition, waste crumb rubber was used as a substitute for fine-aggregates. In total, 9 mixtures were made of 0.1%, 0.15% and 0.2% of zirconium, 10% and 20% of waste crumb rubber, and their combination with bitumen, 70/60 grading and silica aggregate. To evaluate the moisture susceptibility, boiling water tests, indirect tensile test (ITS) and the resilient modulus test were used. Boiling water test results show that the increase in zycotherm improves the moisture susceptibility, but due to the low density of crumb rubber, the crumb rubber hasn’t significant effect on the final result of boiling water test. Based on the results of ITS test and the TSR, a model was generated to predict TSR. According to this model, the minimum required percentage of zycotherm with the replacement of 10% and 20% of crumb rubber, is equal to 0.128% and 0.149%, respectively. According to the experimental results, the addition of a zycotherm increases the Mr, while the substitution of the waste crumb rubber causes a slight increase. Additionally, based on the Mr ratio (RMR), all mixtures have a proper performance against moisture damage.

This paper aims to evaluate the effects of Bentonite on various properties of hot mix asphalt (HMA). The Bitumen was modified with 10%, 15%, 20%, 25% and 30% Bentonite by weight of Bitumen as modifier. In this study the mechanical properties and performance characteristics of modified asphalt concrete were evaluated through various laboratory tests, such as Marshall Stability, resilient modulus, moisture susceptibility, permanent deformation. The performance characteristics evaluated in this study included permanent deformation test and rutting resistance. The test methods used in this evaluation were the dynamic creep test and wheel tracking tests. The results demonstrated that the use of Bentoite can enhance Marshall Stability, resilient modulus, tensile strength, resistance to moisture damage and resistance to permanent deformation of mixtures. The mixtures also showed good resistance to permanent deformation evaluated by means of wheel tracking tests.

Based on the important effects of filler on performance-related properties of asphalt mixtures, this study investigates the influence of filler type on moisture susceptibility of asphalt mixtures under multiple freeze-thaw cycles. Furthermore, the effect of changing the type of mineral fillers, especially replacing fillers with recycled concrete materials on moisture resistance of asphalt mixture, with sustainable development approach, is evaluated. In this study, first, the indirect tensile strength and the resilient modulus tests are conducted following 1, 3, 6, and 10 cycles of freeze-thaw and then the fracture energy is calculated through the results of indirect tensile test. Next, the surface free energy components of mastics with different types of filler are calculated using the static contact angle measurement method. The results of performance-based moisture susceptibility tests show that replacing natural filler with Portland cement can result in the best performance compared to control mixture, limestone filler, and RCA filler. However, the evolution of mechanical properties of control filler, limestone filler, and RCA filler depends on the number of freeze/thaw cycles. At higher conditioning cycles, TSR values demonstrate a different behavior such that the TSR values of the asphalt mixture containing RCA filler increase up to 15% on average compared to the asphalt mixture containing limestone filler after the first cycle. Although the results of mechanical properties in initial freeze-thaw cycles are similar to surface free energy results. However, these results cannot predict the behavior of asphalt mixtures at higher freeze-thaw cycles.

Warm mix asphalt (WMA) is a mixture with a mixing and compaction temperature 30–40 degree less than conventional asphalt mixture. Lower product temperature of WMA leads to increase use of this but this temperature reduction has raised concerns about rutting and fatigue performance. The object of this study is to in to investigate the effect of type of warm mix additives on moisture susceptibility and rutting resistance. For this purpose, limestone and steel slag, two type of filler and Zycotherm and Asphalten-B as warm additive were used for samples preparation and evaluating performance. Indirect tension, resilient modulus and Dynamic creep tests were performed on prepared samples for evaluating the effect of aggregate type, filler and additives on moisture susceptibility and rutting resistance. Results indicate that mixture containing Asphalten-B improve the performance of WMA as compared to HMA in ITS, MR, rutting by 10, 15 and 5%, respectively and in moisture susceptibility, asphalt mixture contain Zycotherm can increase the moisture resistance by about 10%. Also, result show that asphalt mixture containing steel slag aggregate and cement filler the highest durability and rutting resistance.

In this research, glass fibers in the length 12 mm and content of 0.3 percept by the total weight of mixture were used to amend the performance of the warm mix asphalt (WMA). Wheel track test was performed in two states of dry and wet on unaged and short-term aged samples. The post compaction, stripping inflection point, dynamic stability, final cycle, and the number of cycles corresponding to 12.5 and 20 mm rutting depth as well as rutting rate were employed to evaluate the performance of rutting resistance and moisture susceptibility of samples. The results showed that while the incorporation of glass fiber improves all the rutting resistance criteria, it has an insignificant impact on moisture susceptibility of WMA. On the other hand, short-term aging enhances both the rutting and moisture-damage resistance of mixes. Moreover, regression equations were developed to predict C-20 criterion from post compaction, dynamic stability and rutting rate criteria.  

In recent years, regarding the insufficiency of new material and significance of environmental conservation, using recycled material such as Recycled asphalt pavement (RAP) has increased due to the decreased production of environmental pollutants resulting from the preparation of asphalt mixtures. Also, to decrease the energy consumption rate, new technologies have been developed to produce and perform warm asphalt mixtures. These asphalt mixtures have lower temperatures than conventional asphalt mixtures. In this research, RAP has been used in building stone matrix asphalt (SMA) mixture to carry out the moisture susceptibility test by adding warm asphalt additives such as zycotherm, sasobit and Topcel fibers to prevent bitumen draindown of this type of asphalt mixture. The purpose of this paper is to develop a model based on adaptive neuro-fuzzy inference system (ANFIS) for prediction of moisture susceptibility of stone matrix asphalt mixtures (SMA) containing various percentages of RAP and warm mix additives. Various percentages of RAP containing warm mix additive are the parameters for input layer and the ratio of saturated specimen’s strength to that of dry specimen’s strength is the model output. Results indicated high accuracy of the model with a coefficient of determination (R2) of 1 and 0.982 for training and testing data sets and 0.774 for evaluation data-set, respectively. Also, the warm mixtures containing 50% RAP have shown more suitable behavior.

Since preserving the safety and quality of road is among the most important factors in designing and constructing pavements, using porous asphalt as a model of water guiding pavement makes an opportunity to maintain the road safety in raining condition and reduces greatly the risks due to improper climate conditions. Regarding to the construction model of porous asphalt pavement, attention to its quality and durability are among the important issues in designing this type of asphalt mixtures. Experts and researchers have suggested using modern materials and additives in order to improve the function of porous asphalt. One of these materials which is paid attention in using hot common asphalt (HMA) is a waste named steel slag that its positive effects have been seen frequently in function of hot asphalt mixtures. In this research, using slag fine-aggregates as filler in porous asphalts has been compared to fine-aggregates of mountain rocks in order to investigate more accurately. The results obtained from the function tests like Cantabro and moisture sensitivity (lottman) specified that using steel slag as filler not only has improved the function of porous asphalt mixture, but also it has led to decline in functional properties. Moreover, in this research, the causes of obtained results have been reviewed and then, some suggestions have been posed to improve the function of slag porous asphalt function.

Rutting and stripping are among the main distresses that occur in flexible pavements. Moisture damage will result in other distresses such as cracking, raveling and rutting. In this study, rutting and stripping resistance of asphalt mixtures containing different percentages Googas (30, 40 and 50 percent) were evaluated and compared with asphalt mix control under the same conditions. The optimum binder content was obtained from Marshall Method of mix design. The effects of varying googas contents on moisture susceptibility of asphalt mixes were investigated using Indirect Tensile Strength (AASHTO T-283) test. Rutting of this mixes were investigated using Marshall Quotient (ASTM D-1559) test. Marshall Quotient test was performed at temperatures of 45 and 60 ° C. Marshall Quotient test results show that the addition of googas increased the rutting resistance of the asphalt mixes. Indirect tensile test results show that the addition of googas does not increased resistance to moisture susceptibility. Therefore, anti-stripping additives should be used.