Advanced Testing and Characterization of Interlayer Shear Resistance

2005 ◽  
Vol 1929 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Francesco Canestrari ◽  
Gilda Ferrotti ◽  
Manfred N. Partl ◽  
Ezio Santagata
Keyword(s):  
Normal Load ◽  
Shear Resistance ◽  
Test Methods ◽  
Materials Testing ◽  
Specimen Preparation ◽  
Preparation Temperature ◽  
Bond Coats ◽  
Interlayer Shear ◽  
Pavement Construction ◽  
Interlayer Bonding

The performance of multilayered pavement systems depends strongly on interlayer bonding. To guarantee good bonding, tack coats (also called bond coats) are usually applied at various interfaces during pavement construction or overlay. The effectiveness of the tack coat can be assessed with the use of several devices arranged by different laboratories to evaluate interlayer shear resistance. This paper shows how interlayer shear resistance may be evaluated through the Ancona shear testing research and analysis (ASTRA) device. ASTRA results, expressed in units of maximum interlayer shear stress (τpeak), highlight the effects of various influence parameters such as type of interface treatment, curing time, procedure of specimen preparation, temperature, and applied normal load. Moreover, this paper compares the τpeak results obtained by two different shear test devices: the ASTRA tester designed and developed in the Polytechnic University of Marche (Italy) and the layer-parallel direct shear tester created by the Swiss Federal Laboratories for Materials Testing and Research. The two test methods provide different but comparable results showing the same ranking of shear resistance for different interface treatments.

Interlayer shear resistance and anti-skidding durability of asphalt wearing course overlay on tunnel cement pavement

2020 ◽  
pp. 292-296
Author(s):  
Yi Zhang ◽  
Mingjun Hu ◽  
Daquan Sun ◽  
Tong Lu ◽  
Jianmin Ma
Keyword(s):  
Shear Resistance ◽  
Interlayer Shear

Corrosion Issues of HTR Structural Metallic Materials

2008 ◽  
Author(s):  
Celine Cabet ◽  
Brigitte Duprey ◽  
Gouenou Girardin ◽  
Annie Page`s ◽  
Martine Blat
Keyword(s):  
High Temperature ◽  
Corrosion Behavior ◽  
Gas Flow ◽  
Material Selection ◽  
Specimen Preparation ◽  
Residual Water ◽  
Metallic Materials ◽  
Preparation Temperature ◽  
Benchmark Test ◽  
Temperature Oxidation

Within the framework of the ANTARES program, AREVA NP, EDF and the CEA have launched a joint R&D program on metallic materials for VHTR. Reference alloys for circuit and Intermediate Heat eXchanger (IHX) are nickel-based with about 22%wt. of chromium. Compatibility with the HTR primary helium appears to be a determining property for the material selection and qualification. The coolant is actually polluted by a low level of impurities that can interact with metals at high temperature. Oxidation, carburization and/or decarburization occur, in relation to atmosphere characteristics, temperature and alloy chemical composition. As these corrosion effects can notably influence the mechanical properties, they often are determining to the component service life. Since the corrosion behavior is highly sensitive to environmental conditions, material studies require dedicated facilities that shall allow for a strict control of the environment throughout the entire specimen exposure. AREVA NP, CEA, and EDF have developed experimental loops respectively under the names the Chemistry Loop, CORINTH and CORALLINE, ESTEREL; these high temperature helium flow systems are equipped with high accuracy hygrometers and gas analyzers. A benchmark was defined to cross-validate the lab devices and procedures. It is composed of two tests. The joint protocol sets the operating parameters in terms of material, specimen preparation, temperature and heating program, gas pressure and flow rate, time, gas composition. Corrosion is assessed by mass change associated to observations and analyses of the corroded coupons considering the surface scales (nature, morphology and thickness), the internal oxidation (nature, distribution and depth) and the possible carburization/decarburization (type and depth). For benchmark test 1, AREVA NP, CEA, and EDF produced similar results in terms of operation of the tests as well as about the corrosion criteria. On the other hand, benchmark test 2 showed a difference in the residual water vapor level between loops that was shown to strongly influence the specimen behavior. Discrepancies in the alloy corrosion were studied regarding gas flow rates and effective oxygen potential in helium. As a consequence, the experimental tools and procedures have been upgraded. French laboratories have now efficient corrosion facilities and methods at their disposal to study and qualify the corrosion behavior of structural materials in HTR environment.

scholarly journals Influence of Specimen Preparation and Test Methods on the Flexural Strength Results of Monolithic Zirconia Materials

Materials ◽  
2016 ◽  
Vol 9 (3) ◽  
pp. 180 ◽  
Author(s):  
Christine Schatz ◽  
Monika Strickstrock ◽  
Malgorzata Roos ◽  
Daniel Edelhoff ◽  
Marlis Eichberger ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Test Methods ◽  
Specimen Preparation ◽  
Monolithic Zirconia

scholarly journals Methods to Test the Compressive Strength of Earth Blocks

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Guanqi Lan ◽  
Sisi Chao ◽  
Yihong Wang ◽  
Ying Cui
Keyword(s):  
Compressive Strength ◽  
Test Methods ◽  
Test Method ◽  
Material Strength ◽  
Specimen Preparation ◽  
Efficient Design ◽  
Full Size ◽  
The Earth ◽  
Earth Blocks ◽  
Earth Block

The efficient design of new earth structures and the restoration of old structures both require a reliable assessment of the compressive strength of earth materials. However, there is still much debate on the best method to accurately measure the compressive strength of earth blocks. To solve the problem of measuring the compressive strength of the earth block, the cube specimen, the half-block stacked specimen, and the full-size block specimen are used to measure the compressive strength of the molded adobe and rammed adobe, respectively, considering the influence of the specimen preparation process, loading direction, capping, and other factors. By comparing and analyzing the stress state, failure mode, and compressive strength of the specimen under various test methods, a compressive strength test method of earth blocks is determined, which is simple to operate, easy to standardize, and as close as possible to the actual strength of the blocks. The results show that the full-size block compression test method along the block thickness direction should be preferred to test the compressive strength of the earth block. The standard specimen obtained by cutting the full-size block is not suitable for the test of the compressive strength of the earth block; it can effectively solve the problem that the compressive strength of the small-thickness earth block cannot be directly measured by cutting the full-size block in half and stacking it, but it is not recommended to use the binder to bond the two half-blocks. When comparing the compressive strength of the earth blocks, the conversion coefficient related to the height-to-thickness ratio of the specimen cannot be used to convert the compressive strength. Still, the anisotropy of the material strength should be considered.

scholarly journals Stiffness and Fatigue of Asphalt Mixtures for Pavement Construction

2018 ◽  
Vol 26 (2) ◽  
pp. 24-29 ◽  
Author(s):  
Juraj Šrámek
Keyword(s):  
Fatigue Life ◽  
Asphalt Mixture ◽  
Construction Materials ◽  
Test Methods ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Deformation Properties ◽  
Pavement Construction ◽  
And Control

AbstractThe quality of a road is affected by its correct design, the appropriate use of materials, the effects of the climate, and the technological discipline. The deformation properties and fatigue of asphalt layers are important for the design and assessment of semi-rigid and flexible pavements. The assessment of deformation properties is performed by means of a dynamic impact test and the fatigue life of a particular asphalt mixture. An evaluation of the fatigue life is based on decreases in resistance or increases in deformations in different binders and mixtures. The test methods for the design and control of pavement construction materials determine the basic conditions valid for flexible matter. The Two-Point Bending Test was used for determining the deformation characteristics and the fatigue of asphalt mixtures at the Department of Construction Management in Zilina.

Statistical investigation of two different interlayer shear test methods

2008 ◽  
Vol 42 (6) ◽  
pp. 705-714 ◽  
Author(s):  
Felice A. Santagata ◽  
Gilda Ferrotti ◽  
Manfred N. Partl ◽  
Francesco Canestrari
Keyword(s):  
Shear Test ◽  
Test Methods ◽  
Statistical Investigation ◽  
Interlayer Shear

The Analysis on Materials Testing Network of Ecology Environment

2012 ◽  
Vol 427 ◽  
pp. 179-184
Author(s):  
Xin Chun Fang ◽  
Jian Zhong Sun ◽  
Rui Ping Kong ◽  
Lu Kui Shi
Keyword(s):  
Network Performance ◽  
Functional Materials ◽  
Test Methods ◽  
User Needs ◽  
Materials Testing ◽  
Network Technology ◽  
Test Results ◽  
Testing Methods ◽  
Network Testing ◽  
Balance Testing

As the network technology is widely used in the functional materials test of ecology environment, it becomes more and more important to balance testing network performance fast and accurately. However, there are so many network testing methods with a variety of user needs and different scopes. If we use these test methods indiscriminately, time and money is largely consumed, and the testing results often cannot meet user's requirements. Thus, while testing the network performance, in order to accelerate the speed of the material testing, and ensure the quality and the accuracy of test results, characteristics and user's requirements must be selected and improved.

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