Development of Modulus and Fatigue Test Protocol for Fine Aggregate Matrix for Axial Direction of Loading

2016 ◽  
Vol 45 (2) ◽  
pp. 20150295 ◽  
Author(s):  
P. P. Gudipudi ◽  
B. S. Underwood
Keyword(s):  
Fatigue Test ◽  
Axial Direction ◽  
Fine Aggregate ◽  
Test Protocol ◽  
Fine Aggregate Matrix

Testing and Modeling of Fine Aggregate Matrix and Its Relationship to Asphalt Concrete Mix

2015 ◽  
Vol 2507 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Padmini Gudipudi ◽  
B. Shane Underwood
Keyword(s):  
Asphalt Concrete ◽  
Mechanical Response ◽  
Strong Relationship ◽  
Axial Direction ◽  
Unique Element ◽  
Fine Aggregate ◽  
Length Scales ◽  
Multiple Length Scales ◽  
Fine Aggregate Matrix ◽  
Term Performance

The study of the fundamental properties of asphalt concrete (AC) can be used to improve and maximize the performance potential of these materials. In this paper, the fundamental approach is examined by coupling its essential hypothesis to an investigation of AC across multiple length scales. Asphalt and aggregate materials from the state of Arizona were used to prepare fine aggregate matrix (FAM) and AC samples. Laboratory tests on these materials were conducted to investigate the modulus and damage characteristics for two binder types. A comparison of mechanical response across length scales is not new, and the unique element of this study is testing both materials in the axial direction (tension–compression) for both modulus and fatigue. A strong relationship between these two materials was observed; this relationship suggests that tests on FAM samples can provide much needed insight in understanding the behavior of AC for various conditions. The study also investigated upscaling of the FAM properties to those of the AC mixture through a homogenized continua approach. Multiple upscale models were evaluated in this upscaling process, but the chosen method produced the best overall match to experimental data. The findings from this modeling effort were also used to upscale the behaviors of FAM to identify the fatigue characteristics of AC mixtures and evaluate the long-term performance of the material.

Exceptional Fatigue Performances for Umbilical’s Super Duplex Seam Welded Tube Solutions

2014 ◽  
Author(s):  
Olivier Wagner ◽  
Gilles Thevenet ◽  
Jérôme Peultier ◽  
Jean-Philippe Roques ◽  
Henri Romazzotti
Keyword(s):  
Fatigue Test ◽  
Innovative Technology ◽  
Internal Diameter ◽  
Test Protocol ◽  
Acceptance Criteria ◽  
Welded Tube ◽  
Weld Fatigue ◽  
Extensive Program ◽  
The Stability ◽  
Definition Of

Since the last five years, an innovative technology for umbilical’s seam welded super duplex stainless steel tubes (grade 2507, UNS S32750) has been developed in order to meet new technical challenges. An extensive program of qualification, based on 4 dimensions covering the full manufacturing range, i.e. internal diameter and wall thickness, has been set. More than 11000 test results demonstrated the efficiency and the stability of the manufacturing process. The results were also confirming the expected properties of the tubes, in term of mechanical characteristics, corrosion resistance and manufacturing tolerances. At the end of this qualification phase, a Type Approval Certificate was delivered by an independent and official certifying authority demonstrating then, the suitability of the product for offshore static applications. The next step was to confirm the fatigue performance of the product to meet the requirements of umbilicals for dynamic applications. This paper describes how a dedicated fatigue test protocol has been jointly defined between a Major O&G player and the tube supplier. This protocol has been built in order to test the 3 dimensions already produced during the first step of the qualification, considering tube samples with and without orbital weld. Fatigue test programs are known to be very sensitive to the test parameters, i.e. temperature, test frequency and dimensional properties of the samples. As a consequence, special attention is paid to the description of the testing methodology, the selection of the acceptance criteria and the definition of the testing parameters. Finally, the results of this program are presented and discussed in order to assess the capability of the product with respect to the defined acceptance criteria.

scholarly journals Rheological Characterization of Asphalt Fine Aggregate Matrix Using Dynamic Shear Rheometer

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1273 ◽  
Author(s):  
Xiangbing Gong ◽  
Zejiao Dong ◽  
Haipeng Wang ◽  
Xianyong Ma ◽  
Huanan Yu ◽  
...  
Keyword(s):  
Void Content ◽  
Fine Aggregate ◽  
Dynamic Shear ◽  
Rheological Characterization ◽  
Dynamic Shear Rheometer ◽  
Predominant Component ◽  
Asphalt Mix ◽  
Asphalt Content ◽  
Fine Aggregate Matrix ◽  
Air Void

Asphalt fine aggregate matrix (FAM) is a predominant component directly related to field performances of hot asphalt mix (HMA), it is necessary to investigate material properties of FAM. Prior to preparing FAM specimens, the asphalt content was calculated by keeping the filler–bitumen (FB) ratio the same as in the corresponding HMA. A non-destructive fabrication method instead of coring and cutting methods was developed to compact FAM cylinders, and the joint base was designed to be concentric with the loading axis of testing system. Rheological responses of FAM were studied using the dynamic shear rheometer (DSR). Two repeated tests prove that the FAM compactor and the jointed base meet the requirement of data validation. Results show that rheological performances of FAM are significantly affected by asphalt content, gradation, air void content, and testing frequency. Air void is concluded to be the decisive factor which influences the stability of FAM, and the fiber is demonstrated to play a role on enhancing the flow resistance of FAM-F even though with the richest asphalt content.

Experimental Testing and Analysis Procedure to Determine the Apparent Film Thickness of Asphalt Binder in Fine Aggregate Matrix Mixtures

2021 ◽  
Vol 2675 (7) ◽  
pp. 166-179
Author(s):  
Lucas Henrique Vieira ◽  
Thiago Delgado de Souza ◽  
Alexis Jair Enríquez-León ◽  
Francisco Thiago Sacramento Aragão ◽  
Otávio da Fonseca Martins Gomes ◽  
...  
Keyword(s):  
Film Thickness ◽  
Asphalt Concrete ◽  
Experimental Testing ◽  
Asphalt Binder ◽  
Analysis Procedure ◽  
Fine Aggregate ◽  
Concrete Mixtures ◽  
Proper Design ◽  
Fine Aggregate Matrix ◽  
Imagej Software

The fine aggregate matrix (FAM) is an important constituent of an asphalt concrete mixture; the FAM is where some key damage phenomena such as cracking start and propagate. The proper design and fabrication of isolated FAM testing samples that are representative of the material existing within asphalt concrete mixtures requires the objective determination of key characteristics such as the apparent film thickness (FT) of the asphalt binder and the specific surface area of the aggregates. These relevant parameters facilitate the estimation of the binder content. This study presents an experimental testing and analysis protocol to determine the apparent FT that covers particles of fine aggregate in FAM mixtures. The method is based on tests using a scanning electron microscope and a digital image analysis procedure using the open-source Fiji/ImageJ software. The results indicated that apparent FT ranged between 0.5 µm and 30 µm. An additional validation effort was pursued and demonstrated the applicability of the proposed methodology, which can provide meaningful information to improve volumetric-based FAM mix design methods and generate materials that are more representative of those existing in the asphalt concrete mixtures.

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