scholarly journals Laboratory Study on Properties of Tire Crumb Rubber Modified Bituminous Mixture

2012 ◽  
Vol 5 ◽  
pp. 219-223
Author(s):  
Yu Ming Dong ◽  
Yi Qiu Tan
Keyword(s):  
Dynamic Modulus ◽  
Performance Test ◽  
Resilient Modulus ◽  
Viscoelastic Behavior ◽  
Crumb Rubber ◽  
Bending Test ◽  
Bituminous Mixture ◽  
Bituminous Mixtures ◽  
Dynamic Modulus Test ◽  
Mechanical Performances

Abstract: This paper investigates the laboratory properties of tire crumb rubber modified (CRM) bitumen mixture. Two types of mixtures containing two binders (pen90 bitumen; CRM bitumen) were used to produce Marshall Sample and determine optimum content. Mechanical performances of bituminous mixtures were evaluated by Chinese wheel rutting test (WRT), 3point beam bending test (3P-BBT) at low temperature, indirect tensile Strength test (ITST) at freezing-thawing cycles. Superpave gyratory compactor (SGC) specimens also were prepared for modulus test. Resilient modulus (E) data were obtained by unconfined uni-axial compression test according to the specification of China. Dynamic modulus (E★) data were obtained by Simple Performance Test (SPT). Two temperatures were used at dynamic modulus test. The results indicate that CRM bituminous mixture performs better than referenced bituminous mixture on viscoelastic behavior, rutting resistance, cracking resistance and moisture stability.

scholarly journals Effect of Sodium Chloride on the Modulus and Fatigue Life of Bituminous Mixtures

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2126
Author(s):  
Luis Juli-Gándara ◽  
Ángel Vega-Zamanillo ◽  
Miguel Ángel Calzada-Pérez ◽  
Evelio Teijón-López-Zuazo
Keyword(s):  
Fatigue Life ◽  
Sodium Chloride ◽  
Dynamic Modulus ◽  
Hot Mix Asphalt ◽  
Resilient Modulus ◽  
Salt Water ◽  
Decisive Role ◽  
Bituminous Mixture ◽  
Bituminous Mixtures ◽  
Reference Mixture

Bituminous mixtures are not perfectly elastic materials, so their viscoelastic properties play a decisive role in knowing their behavior. This research aims to find out this behavior through the values of the resilient modulus, the dynamic modulus, and the fatigue life for asphalt concrete and porous mixtures when they are influenced by the presence of salt (NaCl, sodium chloride). The aforementioned influence of salt has been evaluated by utilizing three different methods: submerging specimens of bituminous mixture in salt water; introducing salt into the specimens as if it was aggregate and immersing the aggregate in salt water; and drying it and then manufacturing the bituminous mixture with it. As the results indicate, the mixtures submerged in salt water do not show large differences in comparison to the reference mixtures for hot mix asphalt and porous mixtures. However, for hot mix asphalt in which salt has been added as aggregate, the resilient modulus is greater than in the reference mixture. For the bituminous mixtures in which an aggregate saturated in salt water has been used for its manufacture, the results of the resilient modulus test, dynamic modulus test, and fatigue life test are lower than in the reference mixture, especially when the specimens are submerged.

scholarly journals Laboratory Performance Evaluation of High Modulus Asphalt Concrete Modified with Different Additives

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Peng Li ◽  
Mulian Zheng ◽  
Fei Wang ◽  
Fa Che ◽  
Hongyin Li ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Evaluation System ◽  
Performance Test ◽  
Bending Test ◽  
High Modulus ◽  
Common Values ◽  
Static Modulus ◽  
Dynamic Modulus Test ◽  
Better Than

The objective of this study is to evaluate comprehensive performance of high modulus asphalt concrete (HMAC) and propose common values for establishing evaluation system. Three gradations with different modifiers were conducted to study the high and low temperature performance, shearing behavior, and water stability. The laboratory tests for HMAC included static and dynamic modulus tests, rutting test, uniaxial penetration test, bending test, and immersion Marshall test. Dynamic modulus test results showed that modifier can improve the static modulus and the improvements were remarkable at higher temperature. Moreover, modulus of HMAC-20 was better than those of HMAC-16 and HMAC-25. The results of performance test indicated that HMAC has good performance to resist high temperature rutting, and the resistances of the HMAC-20 and HMAC-25 against rutting were better than that of HMAC-16. Then, the common values of dynamic stability were recommended. Furthermore, common values of HMAC performance were established based on pavement performance tests.

The Application of High Modulus Mixture of EME2 on Qin Lin Expressway Test Road

2013 ◽  
Vol 361-363 ◽  
pp. 1800-1804
Author(s):  
Xiao Yan Wang ◽  
Hai Sheng Zhao ◽  
Lin Wang
Keyword(s):  
Low Temperature ◽  
Dynamic Modulus ◽  
Design Method ◽  
Bending Test ◽  
High Modulus ◽  
Test Road ◽  
Low Temperature Cracking ◽  
Dynamic Modulus Test ◽  
High Dynamic ◽  
Test Result

This paper used the design method of EME high modulus HMA from France to carry out the mix design of EME2(0/14) HMA, and carried out Duriez test, HWTD, dynamic modulus test and low temperature bending test. The test result showed that this kind of HMA had excellent water resistance, high temperature rutting resistance, high dynamic modulus and low temperature cracking resistance. This EME high modulus HMA was applied in the test road on Qing Lin expressway.

The Property Research on Interfacial Modificated Semi-Flexible Pavement Material

2011 ◽  
Vol 71-78 ◽  
pp. 1090-1098
Author(s):  
Yan Yang ◽  
Shao Long Huang ◽  
Qing Jun Ding ◽  
Xin Yan Peng
Keyword(s):  
Shear Strength ◽  
Fatigue Life ◽  
Low Temperature ◽  
Dynamic Modulus ◽  
Stress Ratio ◽  
Flexible Pavement ◽  
Bending Test ◽  
Interfacial Modification ◽  
Dynamic Modulus Test ◽  
Interfacial Modifier

Based on shearing test, bending test in low temperature, fatigue test and dynamic modulus test, the text researched the effect on the property of the semi-flexible pavement by a kind of interfacial modifier. The study showed the feasible content of interfacial modifier was 0.4～0.6% . Used 0.4%, the shear strength reached 1.83MPa, flexural strength 6.97MPa, and fatigue-life was over 40000 at 0.2 stress ratio. From interfacial modification, the synthesis property of semi-flexible pavement was especially perfect.

scholarly journals Experimental Characterization of Viscoelastic Behaviors of Nano-TiO2/CaCO3 Modified Asphalt and Asphalt Mixture

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 106
Author(s):  
Chunli Wu ◽  
Liding Li ◽  
Wensheng Wang ◽  
Zhengwei Gu
Keyword(s):  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Viscoelastic Behavior ◽  
Good Prediction ◽  
Experimental Characterization ◽  
Bituminous Mixture ◽  
Nano Tio2 ◽  
Static Compression ◽  
Viscoelastic Behaviors

The purpose of this paper is to promote the application of nano-TiO2/CaCO3 in bituminous materials and present an experimental characterization of viscoelastic behaviors of bitumen and bituminous mixture modified by nano-TiO2/CaCO3. In this work, a series of viscoelastic behavior characterization tests were conducted, including dynamic shear rheometer (DSR) test for bitumen, uniaxial static compression creep test and dynamic modulus test for bituminous mixture. Moreover, various viscoelastic models with clear physical meanings were used to evaluate the influence of nano-TiO2/CaCO3 on the macroscopic performance of bitumen and bituminous mixture. The results show that bitumen and its mixtures are time-temperature dependent. The Christensen-Anderson-Marasteanu (CAM) model of frequency sweep based on DSR test indicated that adding nano-TiO2/CaCO3 can effectively capture the sensitivity of temperature. In addition, the incorporation of nano-TiO2/CaCO3 in bituminous mixture can significantly enhance the high-temperature anti-rutting, and slightly improve the low-temperature anti-cracking as well. At the same time, the modified Burgers model can accurately describe the viscoelastic behavior of bituminous mixtures in the first two creep stages, reflecting the consolidation effect of bituminous mixture. Also, the generalized Sigmoidal model can accurately grasp the characteristics of the relationship between dynamic modulus and reduced frequency and achieve good prediction effects in a wider frequency range.

scholarly journals Development of Functional Rubber-Based Impact-Absorbing Pavements for Cyclist and Pedestrian Injury Reduction

2021 ◽  
Vol 13 (20) ◽  
pp. 11283
Author(s):  
Christina Makoundou ◽  
Cesare Sangiorgi ◽  
Kenth Johansson ◽  
Viveca Wallqvist
Keyword(s):  
Weather Conditions ◽  
Crumb Rubber ◽  
Dry Process ◽  
Injury Reduction ◽  
Bituminous Mixtures ◽  
Pedestrian Injury ◽  
Wide Range ◽  
Different Temperatures ◽  
Impact Attenuation ◽  
Mechanical Performances

Cyclists, pedestrians and elderly people’s specific needs in urban road infrastructures are often neglected. They rarely benefit from safety measures or innovations. Inspired by playgrounds and aiming to reduce vulnerable road users (VRUs) injuries, the development of the rubber-based Impact-Absorbing Pavements (IAP) offers a possibility to rethink the design of urban pavements and address safety on roads, which constitutes a major challenge in terms of attaining more sustainable, resilient, and safe cities. Therefore, bituminous mixtures with four different crumb rubber contents, 0%, 14%, 28%, and 33% (in total weight), were produced by partial aggregates substitution using the dry process. After the assessment of the geometrical and volumetric properties, the mechanical performances were evaluated. Finally, the samples were tested to measure the abrasion and impact attenuation with the well-known Head Injury Criterion (HIC), at different temperatures from −10 to 40 °C, to obtain a wide range of values referring to possible weather conditions. A significant effect of the rubber percentage and layer thickness on impact attenuation was observed. All observations and results confirm the feasibility of the IAP concept and its positive effect on future injury-prevention applications.

scholarly journals Utilization of Bitumen, Aggregate and Wax with Rubber Tyre in a Flexible Pavement

2021 ◽  
Vol 1197 (1) ◽  
pp. 012017
Author(s):  
Rajat Mohan ◽  
Aakash Gupta ◽  
Kshitij Gaur
Keyword(s):  
Flexible Pavement ◽  
Crumb Rubber ◽  
Partial Replacement ◽  
Bituminous Mixture ◽  
The Road ◽  
Bituminous Mixtures ◽  
Road Pavement ◽  
Waste Rubber ◽  
Bitumen Content ◽  
Maximum Stability

Abstract With continuous wear and tear actions of rubber tyre on roads, a pile of waste rubber gets accumulated every year and it is posing severe threats to the environment. Due to high temperature in the summers, the road tends to become brittle, which may cause separation of binder in the bituminous road causing heavy cracks, so usage of wax tends to reduce the formation of cracks and improve the flexibility of road. This study aims to examine the effects on properties of the bitumen-aggregate mixture when the aggregates are partially replaced by similar sizes of waste rubber tyre particles and bitumen in the mix are partially replaced by a crumb waste rubber tyre, with partial addition of wax content in the bituminous samples. For this purpose of testing the suitability of using rubber waste in road pavement, Marshall Stability test is conducted on several bituminous mixtures. Varying percentages of rubber tyre, such as 0%, 5%, 10% and 15%, are used with different percentages of bitumen content (4.0, 4.2, 4.4, and 4.6), and varying percentages of paraffin wax (0-5%) is also added in the specimen with rubber and bitumen. This is utilized in obtaining the optimum content of bitumen required for best suitability of flexible pavement as well as to assess the durability and strength of a pavement. This study is performed on various mixtures, for the values of bulk density, air voids, stability value and flow value. The studies show that bitumen content corresponding to the maximum stability value and maximum bulk specific gravity in bituminous mixture, indicating the optimum bitumen percentage that can be replaced with crumb rubber tyre. This paper discusses the partial replacement of both aggregate and bitumen in the bituminous mixture, containing some percentages of paraffin, which can help in improving the serviceability level and assists in enhancing the flexibility and cohesion of road to resist heavy loadings of vehicle.

Evaluation of Moisture and Ageing Effects on Calcium Carbonite Nanoparticles Modified Asphalt Mixtures

2018 ◽  
Vol 34 ◽  
pp. 40-47 ◽  
Author(s):  
Shaban Ismael Albrka Ali ◽  
Riyadh Abdulwahid ◽  
Muhamed Laith Eidan ◽  
Nur Izzi Md Yusoff
Keyword(s):  
Tensile Strength ◽  
Dynamic Modulus ◽  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Indirect Tensile Strength ◽  
Traffic Load ◽  
Moisture Susceptibility ◽  
Modified Asphalt ◽  
Dynamic Modulus Test ◽  
Indirect Tensile

Flexible pavements deteriorate and crack with time due to the frequent traffic load imposed upon it. Many studies have been done to predict the effects of frequent traffic load and environmental conditions on pavements in the effort to find the best pavement design which resist deterioration and ensure longer pavement service time. This study investigates the effect of mixing asphalt with varying percentages of nano calcium carbonate (CaCO3), namely 0, 2, 4, and 6 %. The mixtures were designed based on the Superpave mix design criteria. Investigation was done using several tests, namely resilient modulus, indirect tensile strength, moisture susceptibility, and dynamic modulus tests. Samples were subjected to aging to determine their resilient modulus. The results of the investigation show that resilient modulus and indirect tensile strength increased when higher percentages of nanoparticles were added to asphalt mixture, with improvement of 138 and 48.18% respectively. Modified binders showed up to 17% improvement in moisture susceptibility comparison to base asphalt mixture, while the result of dynamic modulus test showed that the stiffness of modified asphalt increased 76.69%. The investigation also found that adding 6% CaCO3 nanoparticles to asphalt produced modified asphalt with the best performance. In addition, the results show that the modified asphalt with CaCO3 is suitable for hot and humid regions (tropical countries) in the field of highways construction, as the modifier was able to mitigate the influences of high-temperature rutting and moisture damage.

scholarly journals Dynamic Characteristics of Warm Mix Foamed Asphalt Mixture in Seasonal Frozen Area

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Yun Hou ◽  
Yanxia Cai ◽  
Zhishu Zang ◽  
Zhenyu Qian ◽  
Bin Zhao
Keyword(s):  
Water Consumption ◽  
Dynamic Characteristics ◽  
Dynamic Modulus ◽  
Resilient Modulus ◽  
Asphalt Mixture ◽  
Loading Frequency ◽  
Static Modulus ◽  
Foamed Asphalt ◽  
Inflection Points ◽  
Dynamic Modulus Test

In order to study dynamic characteristics of warm mix foamed asphalt mixture in seasonal frozen area, cylinder dynamic modulus test of four kinds of mixture with two gradations and three kinds of asphalt was carried out by UTM-100. Then, the effects of test temperature, loading frequency, and foaming water consumption on dynamic modulus were analyzed. Finally, the compressive resilient modulus trial was made to compare mechanical properties. Results show that dynamic modulus for warm mix foamed asphalt mixture increases with rising temperature and decreased frequency. The inflection points of the dynamic modulus vs frequency curves at low temperature, normal temperature, and high temperature are 2 Hz, 10 Hz, and 15 Hz, respectively. Static modulus of SBS# modified and nonmodified warm mix foamed asphalt mixture is corresponding to the dynamic modulus 0.001 Hz–0.1 Hz and 0.00001 Hz–0.05 Hz. The effect on gradation type on the dynamic modulus of asphalt mixture is AC-20 > AC-13, and the degree of sensitivity of the water consumption to the master curve equation of dynamic modulus under different gradations is AC-13 > AC-20.

scholarly journals Mechanical Characteristics of Graphene Nanoplatelets-Modified Asphalt Mixes: A Comparison with Polymer- and Not-Modified Asphalt Mixes

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2434
Author(s):  
Laura Moretti ◽  
Nico Fabrizi ◽  
Nicola Fiore ◽  
Antonio D’Andrea
Keyword(s):  
Fatigue Resistance ◽  
Graphene Nanoplatelets ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Asphalt Mixes ◽  
Modified Asphalt ◽  
Bituminous Mixtures ◽  
Water Sensitivity ◽  
Polymer Modified Asphalt ◽  
Mechanical Performances

In recent years, nanotechnology has sparked an interest in nanomodification of bituminous materials to increase the viscosity of asphalt binders and improves the rutting and fatigue resistance of asphalt mixtures. This paper presents the experimental results of laboratory tests on bituminous mixtures laid on a 1052 m-long test section built in Rome, Italy. Four asphalt mixtures for wearing and binder layer were considered: two polymer modified asphalt concretes (the former modified with the additive Superplast and the latter modified with styrene–butadiene–styrene), a “hard” graphene nanoplatelets (GNPs) modified asphalt concrete and a not-modified mixture. The indirect tensile strength, water sensitivity, stiffness modulus, and fatigue resistance of the mixtures were tested and compared. A statistical analysis based on the results has shown that the mixtures with GNPs have higher mechanical performances than the others: GNP could significantly improve the tested mechanical performances; further studies will be carried out to investigate its effect on rutting and skid resistance.

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