scholarly journals COMPARATIVE ANALYSIS OF LOW TEMPERATURE STRENGTH OF MODIFIED ASPHALT CONCRETES

2020 ◽  
Vol 6 (444) ◽  
pp. 261-267
Author(s):  
M. Zh. Zhurinov ◽  
◽  
B. B. Teltayev ◽  
Ye. D. Amirbayev ◽  
A. O. Elschibayev ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Low Temperature ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Concrete Strength ◽  
Constant Strain Rate ◽  
Petrochemical Plant ◽  
Type B ◽  
Direct Oxidation ◽  
Modified Asphalt

A comparative analysis has been performed in this work for low temperature strength of 31 types of the conventional (non-modified) and modified road asphalt concretes. The neat bitumens of the grades BND 70/100, BND 100/130 and BND 130/200 have been produced by the Pavlodar petrochemical plant from the crude oil of the Western Siberia (Russia) by the method of direct oxidation and they satisfy the requirements of the standard ST RK 1373-2013. The polymers Elvaloy 4170, Elvaloy AM, Kraton, Calprene 501, Butonal NS, SBS (L 30-01 A), KUMHO KTP and crumb rubber have been used for the modification of the bitumens. The modification of the bitumens has been performed in the laboratory of Kazakhstan Highway Research Institute. The modified bitumens satisfy the requirements of the standard ST RK 2534-2015. The conventional and modified asphalt concretes satisfy the requirements of the standards ST RK 1225-2019, ST RK 1223-2019, ST RK 2028-2010, ST RK 2373-2019 and GOST 31015-2002. The strength of the asphalt concretes at uniaxial direct tension at a constant strain rate of 1 mm/min at the temperatures of -10 °С, -20 °С and -30 °С determined in the device TRAVIS under the standard EN 2697-46 has been accepted as a characteristic of their low temperature strength. It is found out that various modifiers affect the asphalt concrete strength in different ways: a degree of impact depends both on a type of an asphalt concrete and a modifier, as well as on a negative temperature value. Some modifiers increase, and some of them decrease the strength of the asphalt concretes at low temperatures compared with the original asphalt concretes. Among the modifiers the polymer Elvaloy AM has been found to be the most efficient at low temperatures. The asphalt concretes of type B with the bitumens of grades BND БНД 100/130 and BND 130/200 at modification by the polymer Elvaloy AM had the biggest strength at all the considered low temperatures: at -10 ºC – 6.79 MPa and 6.43 MPa; at -20 ºC – 7.57 MPa and 7.87 MPa; at -30 ºC – 7.35 MPa and 8.86 MPa. The stone mastic asphalt concretes 15 and 20 with the polymers and without them at all the considered low temperatures practically had the strength not higher than the basic asphalt concretes of type B with neat (original) bitumens of grades BND 100/130 and BND 130/200.

Fracture toughness of polymer-modified asphalt concrete at low temperatures

2003 ◽  
Vol 30 (2) ◽  
pp. 406-413 ◽  
Author(s):  
Kwang W Kim ◽  
Seung Jun Kweon ◽  
Young S Doh ◽  
Tae-Soon Park
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Asphalt Binder ◽  
Polymer Modification ◽  
Modified Asphalt ◽  
Temperature Damage ◽  
Polymer Modified Asphalt ◽  
Styrene Butadiene

The fracture toughness of asphalt concrete increases at low temperature and then decreases at temperatures below a certain level. Some polymers are known to have the property of improving the temperature susceptibility of asphalt binder at low temperatures. Therefore, this study evaluated the fracture toughness (KIC) of some polymer-modified asphalt concretes. Low-density polyethylene (LDPE), styrene–butadiene–styrene (SBS), and a mixed polymer of LDPE and SBS were used in this study. The fracture toughness KIC of normal asphalt concrete was compared with that of polymer-modified asphalt (PMA) concrete, and the effectiveness of polymer modification against falling values of KIC was evaluated at low temperatures. The results showed that PMA concretes, in general, showed better KIC than normal asphalt concretes, and the temperature at which the highest KIC was obtained was lower than that in the case of normal asphalt concrete. Therefore, the PMA concretes evaluated in this study had better fracture resistance than normal asphalt at low temperatures.Key words: asphalt concrete, polymer-modified asphalt, PMA, fracture toughness, differential thermal contraction, low-temperature damage.

scholarly journals MAIN STANDARD INDICATORS OF POLYMER ASPHALT CONCRETES

2021 ◽  
Vol 445 (1) ◽  
pp. 194-202
Author(s):  
M. Zh. Zhurinov ◽  
B. B. Teltayev ◽  
E. D. Amirbayev
Keyword(s):  
Tensile Strength ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Water Saturation ◽  
Petrochemical Plant ◽  
Type B ◽  
Freezing And Thawing ◽  
Mastic Asphalt ◽  
Reactive Polymers ◽  
Stone Mastic Asphalt

The main indicators of 29 types of asphalt and polymer asphalt concretes prepared with the use of neat bitumens of 2 grades and 7 types of polymer bitumens have been determined and comparatively analyzed in the work. The bitumens of grades BND 100/130 and BND 130/200 produced by the Pavlodar petrochemical plant have been selected for preparation of the asphalt concretes, polymer bitumens and polymer asphalt concretes. 7 types of the polymers (Elvaloy 4170, Elvaloy AM, Kraton D 1192A, Calprene 501, SBS L 30-01 A, KUMHO KTR, Butonal NS 198) have been selected for the modification of the bitumens. Short procedure has been represented for the preparation of the polymer bitumens. 29 types of the asphalt and the polymer asphalt concretes have been prepared with the use of the above bitumens and polymer bitumens (asphalt concrete of type A - 7, asphalt concrete of type B - 15, stone mastic asphalt concrete SMA-15 - 1, stone mastic asphalt concrete SMA-20 - 6). The following main indicators of quality have been determined for the asphalt concretes and polymer asphalt concretes by testing in relevant laboratory devices: 1) rut depth at the temperature of 60 °С after 10 000 passages of the wheel (ST RK EN 12697-22-2012); 2) tensile strength at the temperature of -30 °С (pr. EN 12697-46-2012); 3) compression strength at the temperature of 50 °С (ST RK 1218-2003); 4) water saturation (ST RK 1218-2003). It is found out that the modification of the bitumens with the polymers increases essentially the main standard indicators of the asphalt concretes: rutting resistance, strength at high temperatures and low temperatures, resistance to the cyclic freezing and thawing (frost resistance). The reactive polymers Elvaloy 4170 and Elvaloy AM are the most efficient among the used ones.

scholarly journals COMPARATIVE ANALYSIS OF LOW TEMPERATURE RESISTANCE FOR NANOCARBON AND OTHER BITUMENS

2020 ◽  
Vol 5 (443) ◽  
pp. 89-96
Author(s):  
Zhurinov M.Zh., ◽  
◽  
Teltayev B.B., ◽  
Kalybay A.A., ◽  
Rossi C.O., ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Low Temperature ◽  
Polyphosphoric Acid ◽  
Crumb Rubber ◽  
Petrochemical Plant ◽  
Short Term ◽  
Temperature Resistance ◽  
Coal Rock ◽  
Low Temperature Resistance

A comparative analysis of the low temperature resistance for a nanocarbon bitumen and other 30 neat and modified bitumens has been performed in the work. The stiffness at the temperatures of -24°С, -30°С and -36°С under technical system Superpave has been accepted as an indicator of low temperature resistance of the bitumens. The stiffness of the bitumens has been determined on a bending beam rheometer (standard ASTM D 6648-08). Before testing the bitumens have been subjected to the double artificial aging: short-term aging – under standard AASHTO Т 240-13 and long-term aging – under standard ASTM D 6521-08. The nanocarbon bitumen has been prepared in the laboratory of the Kazakhstan Highway Research Institute (KazdorNII) with the use of a road bitumen of the grade BND 70/100 produced by the Pavlodar petrochemical plant (PNHZ) and a nanocarbon powder (2% by weight) manufactured from a coal rock of the deposit “Saryadyr” “Corporation “ON-Olzha” LLP, Akmola region, Kazakhstan). The nanocarbon powder (150-200 nm) has been manufactured by three-stage size reduction of the coal rock: I – a mechanical dispergator (up to 2-3 mm), II – an aerodynamic mill (up to 20 mcm), III – a reactor with a rotating electromagnetic field. The neat bitumens of the grades BND 50/70, BND 70/100, BND 100/130 have been produced by the plants of Kazakhstan and Russia; they satisfy the requirements of the standard ST RK 1373-2013. The modified bitumens have been prepared in the laboratory of KazdorNII with the use of the neat bitumens, 7 types of the polymers, crumb rubber and polyphosphoric acid and they satisfy the requirements of the standard ST RK 2534-2014. It has been determined that the nanocarbon bitumen is one of the most resistant at the low temperatures: -24°С, -30°С and -36°С.

Study of Rheological Properties of Cariphalte Modified Asphalt

2014 ◽  
Vol 638-640 ◽  
pp. 1185-1189
Author(s):  
Tan Hua
Keyword(s):  
Comparative Analysis ◽  
Rheological Properties ◽  
Fatigue Damage ◽  
Systematic Study ◽  
Low Temperatures ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Fatigue Properties ◽  
Dynamic Shear ◽  
Modified Asphalt

To explore the effects of different factors on the rheological properties of cariphalte modified asphalt, based superpave asphalt binder relevant norms, through the use of dynamic shear rheometer Shell 70# asphalt under different temperature, frequency and strain conditions and rheological properties of cariphalte modified asphalt carrying on a systematic study, and comparative analysis of the two anti-fatigue properties of asphalt in the middle and low temperature.The results show that: compared with 70# asphalt, cariphalte modified asphalt has better rutting resistance over a wide temperature range; at lower frequencies and high intensity pavement, cariphalte modified asphalt to better resistance to permanent deformation; better fatigue resistance at low temperatures, and more fatigue damage is not easy to achieve.

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.

Low-Temperature Cracking and Aging Performance of Modified Asphalt Concrete Specimens

1998 ◽  
Vol 1630 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Richard Fortier ◽  
Ted S. Vinson
Keyword(s):  
Low Temperature ◽  
Asphalt Concrete ◽  
Bending Beam Rheometer ◽  
Modified Asphalt ◽  
Acrylate Copolymer ◽  
Specimen Test ◽  
Low Temperature Cracking ◽  
Creep Stiffness ◽  
Rheometer Test ◽  
Aging Performance

The thermal stress restrained specimen test (TSRST) was used to evaluate the low-temperature cracking resistance and aging performance of modified asphalt concrete (AC) specimens. One aggregate, two asphalt cements (AAA-1 and AAB-1), five modifiers (latex polymer, ethylene acrylate copolymer, rubber powder, elastomer, and a blend of polypropylene and Kevlar fibers), and four 85°C oven aging levels (0, 5, 25, and 50 days) were considered. The results of the bending beam rheometer test (BBRT) on binders at −20°C showed that AAA-1 displayed a smaller creep stiffness than AAB-1. Only two modifiers increased the deflection and softness of AAB-1. The additives in AAA-1 did not improve its lowtemperature rheological behavior. These results served as the basis for comparison with those from the TSRST. The fracture strength and temperature of AC specimens are sensitive to asphalt type (4.11 MPa and −32.2°C for AAA-1, 3.28 MPa and −25.4°C for AAB-1) and degree of aging (from 4.11 to 2.04 MPa and from −32.2 to −21.2°C for AAA-1 for aging levels from 0 to 50 days at 85°C). Only one modifier in AAB-1 (among the two candidates identified with the BBRT) improved the low-temperature performance of the AC specimens. After 50 days of aging, no improvement was observed. The modified AAA-1 AC specimens displayed an optimum improvement in performance for aging levels of 25 and 50 days. Several modified AC specimens displayed a low-temperature failure without apparent fracture. This behavior would appear to be advantageous for the performance of pavements in cold regions.

Thermal Stress Analysis on Steel Bridge Deck with Epoxy Asphalt Concrete under Low Temperature Based on Viscous-Elastic Method

2012 ◽  
Vol 598 ◽  
pp. 504-510 ◽  
Author(s):  
Huan Yun Zhou ◽  
Yang Liu
Keyword(s):  
Thermal Stress ◽  
Low Temperature ◽  
Temperature Stress ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Asphalt Mixture ◽  
Maximum Temperature ◽  
Steel Bridge ◽  
Epoxy Asphalt ◽  
Epoxy Asphalt Concrete

Epoxy asphalt concrete has been widely used in China as an excellent paving material on long-span steel bridges. Analysis of its low-temperature thermal stress can be a more accurate grasp of pavement low temperature stress condition. The bending creep test of epoxy asphalt mixture was carried out at low temperatures to obtain the creep compliances and determine the relaxation module. Then the principal curves of the relaxation module were regressed in a form of Prony progression expression by Matlab. The relaxation module was further converted to the parameters needed in the viscous-elastic module in ANSYS software. Finally, a three-dimensional full-scale Finite Element model for steel box girder and asphalt overlay was constructed to analyze the stress scenario under low temperatures for the duration of 48 hours. The maximum temperature stress was only 2.45 MPa at a temperature of -20.4°C and thus no shrinkage cracks will occur.

Investigation of the effects of different polymer-modified asphalt cements on asphalt mixes at low temperature

2007 ◽  
Vol 34 (5) ◽  
pp. 589-597 ◽  
Author(s):  
K Kandil ◽  
A O Abd El Halim ◽  
Y Hassan ◽  
A Mostafa
Keyword(s):  
Low Temperature ◽  
High Resistance ◽  
Asphalt Concrete ◽  
Elevated Temperatures ◽  
Winter Season ◽  
Experimental Program ◽  
Asphalt Cement ◽  
Modified Asphalt ◽  
Concrete Mixtures ◽  
Polymer Modified Asphalt

The extreme environmental conditions in Canada require the use of asphalt cement that can provide a high resistance to low-temperature cracking during the winter season and a high resistance to rutting due to the elevated temperatures in the summer. Earlier studies showed that such desired improvements in the quality of asphalt cement could be achieved using polymer-modified asphalt (PMA) cement. This paper presents a three-phase experimental program that was carried out to evaluate the expected performance of asphalt concrete mixtures with PMA compared to asphalt concrete mixtures with conventional and air-oxidized asphalt binders. The results of this study show that PMA in asphalt concrete mixes would significantly improve the resistance to cracking (loading and low-temperature). Key words: asphalt mixtures, polymer-modified asphalt, conventional asphalt cement, air-oxidized asphalt, testing.

scholarly journals Evaluation of Mechanical properties for polypropylene Modified Asphalt concrete Mixtures

2017 ◽  
Vol 5 (12) ◽  
pp. 7797-7801 ◽  
Author(s):  
Safaa Moubark ◽  
Farag Khodary ◽  
Ayman Othman
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Asphalt Concrete ◽  
Road Traffic ◽  
Modified Asphalt ◽  
Concrete Mixtures ◽  
Low Temperature Cracking ◽  
Asphalt Modification ◽  
Indirect Tensile ◽  
Polymer Modified Asphalt

It is noticeable that the increase of road traffic during the last two decades in addition to the insufficient degree of maintenance caused an accelerated deterioration of road structure. These roads show early signs of distress such as rutting, cracking, low temperature cracking, ageing and stripping. Heavier loads and higher traffic volume demand higher performance of pavement.  Excellent performance of pavement requires bitumen that is less susceptible to high temperature, rutting or low temperature cracking. Several additives are used to increase the performance of bitumen and the quality of the produced mixtures. Polymers are considered the most widely used additives in asphalt modification that give better performance. The performance of the Polymer-modified asphalt depends on the type and the level of modification the used polymer. The choice of modification level and t modification type depends on the physical properties of the polymer, and its compatibility with bitumen. The polymer can be loosely classified into two categories, Plastomers and Elastomers. The results indicated that, the addition of polypropylene generally improved the mechanical properties of the mixture regardless of the percentage of polymers that added and (PP) content of 5%. it can be noticed that  the performance of PP-modified asphalt mixtures is better  compared with unmodified asphalt concrete mixtures  modifier because it has the highest Marshall Stiffness, indirect tensile strength and unconfined compressive strength

Warm Asphalt Mixes Based on Polymer-Bitumen Binders

2020 ◽  
Vol 992 ◽  
pp. 243-247
Author(s):  
V.V. Yadykina ◽  
M.V. Chichigin
Keyword(s):  
Asphalt Concrete ◽  
Low Temperatures ◽  
Energy Efficient ◽  
Theoretical Basis ◽  
Type B ◽  
Asphalt Mixes ◽  
Control Samples

The article presents theoretical basis for the use of energy efficient additives for the production of warm asphalt-concrete mixes on the basis of polymer-bitumen binders; the principles are proposed on how to reduce the temperature, when asphalt-concrete is spread by adding energy-efficient additive. It has been established that in terms of its physical and mechanical operational qualities warm Type b polymer asphalt concrete that has been condensed at low temperatures is not inferior to the control samples of asphalt concrete that has been prepared according to the classic recipe.

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