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 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 Evaluation of stiffness to predict rutting resistance of hot-mix asphalt: a Canadian case study

2014 ◽  
Vol 9 (4) ◽  
pp. 283-296
Author(s):  
Md Safiuddin ◽  
Susan Louise Tighe ◽  
Ludomir Uzarowski
Keyword(s):  
Regression Analysis ◽  
Dynamic Modulus ◽  
Hot Mix Asphalt ◽  
Resilient Modulus ◽  
Design Method ◽  
Strong Relationship ◽  
Dynamic Moduli ◽  
Rutting Resistance ◽  
The Relationship ◽  
French Laboratory

This paper investigates the relationship between the stiffness and rutting resistance of hot-mix asphalt. Ten different types of hot-mix asphalt were examined. The Superpave mix design method was utilized to produce nine mixes; the remaining mix was designed using the Marshall method. The asphalt mixes were tested for stiffness and rutting resistance under the Centre for Pavement and Transportation Technology research program at the University of Waterloo. The stiffness was determined by the laboratory resilient and dynamic moduli tests. The dynamic modulus test was conducted at six different loading frequencies and five different temperatures. The rutting test was executed by the Hamburg Wheel Rut Tester and the French Laboratory Rutting Tester to obtain rutting depth. The regression analysis was performed to examine the relationships of resilient and dynamic moduli with rutting depth. The results of the regression analysis revealed that resilient modulus did not correlate well with rutting depth. In contrast, dynamic modulus showed strong correlation with rutting depth for a number of loading frequencies and temperatures. The strong relationship was observed at the higher temperatures of +46.1 oC and +54.4 oC. Moreover, the relationship between dynamic modulus and rutting depth was better for lower loading cycles/wheel passes applied in the rutting test. It was also noticed that dynamic modulus exhibited a better relationship with rutting depth obtained from the French Laboratory Rutting Tester. The overall findings indicate that the dynamic moduli obtained at 0.1–1.0 Hz and +46.1–(+54.4) oC are useful to predict the rutting resistance of hot-mix asphalt.

scholarly journals MECHANICAL BEHAVIOR OF COLD BITUMINOUS MIXTURE UNDER EFFECTS OF STATIC AND REPEATED LOADS1

2017 ◽  
Vol 41 (2) ◽  
Author(s):  
Tamyres Karla da Silva ◽  
Carlos Alexandre Braz de Carvalho ◽  
Geraldo Luciano de Oliveira Marques ◽  
Dario Cardoso de Lima ◽  
Taciano Oliveira da Silva ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Fatigue Life ◽  
Mechanical Behavior ◽  
Experimental Research ◽  
Resilient Modulus ◽  
Mixture Design ◽  
Bituminous Mixture ◽  
Diametral Compression ◽  
Service Specification ◽  
Marshall Stability

Abstract This paper presents the results of an experimental research aimed at analyzing the mechanical behavior of a cold bituminous mixture under effects of static and repeated loads. Initially, a Marshall mixture design was performed to determine the mixture design contents according to standard DNER (1994a). After obtaining the mixture design contents, nine bituminous specimens were molded and subjected to the following tests: resilient modulus, tensile strength by diametral compression, and fatigue. The Marshall stability, independent from the mixture content used, surpassed the minimum limit recommended by the service specification DNIT (2010a). Regarding the Marshall flow, the values found exceeded the required by the referred specification. The results obtained for the average tensile strength by diametral compression, resilient modulus and fatigue life of the bituminous mixture were, respectively, 0.47 MPa, in the range of 1530-1837 MPa, and lower than 1000 cycles (for most stress differences applied), which were lower than those commonly reported for hot mixtures.

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