3D elastic solutions for point load and Brazilian indirect tensile strength tests

2013 ◽  
pp. 887-892 ◽  
Author(s):  
Mehdi Serati ◽  
Habib Alehossein ◽  
Nazife Erarslan ◽  
David J.Williams
Keyword(s):  
Tensile Strength ◽  
Point Load ◽  
Indirect Tensile Strength ◽  
Strength Tests ◽  
Indirect Tensile ◽  
Brazilian Indirect Tensile Strength

scholarly journals Models to estimate Brazilian indirect tensile strength of limestone in saturated state

2016 ◽  
Vol 31 (2) ◽  
pp. 59-67
Author(s):  
Zlatko Briševac ◽  
Trpimir Kujundžić
Keyword(s):  
Neural Networks ◽  
Tensile Strength ◽  
Mechanical Characteristics ◽  
Indirect Tensile Strength ◽  
Engineering Practice ◽  
Wide Spread ◽  
Efficacy Assessment ◽  
Indirect Tensile ◽  
Brazilian Indirect Tensile Strength ◽  
Physical And Mechanical Characteristics

There are a number of methods for estimating physical and mechanical characteristics. Principally, the most widely used method is regression, but recently, more sophisticated methods such as neural networks have frequently been applied as well. This paper presents the models of a simple and a multiple regression and neural networks –types Radial Basis Function and Multiple Layer Perceptron, which can be used for the estimate of the Brazilian indirect tensile strength in saturated conditions. The paper includes the issues of collecting data for the analysis and modelling and an overview of the performed analysis with an efficacy assessment of the estimate for each model. After the assessment, the model which provided the best estimate was selected, including the model which could have the most wide-spread application in the engineering practice.

Experimental Investigation on Fracture and Tensile Characteristics of Micro-Surfacing Containing Crumb Rubber

2008 ◽  
Vol 385-387 ◽  
pp. 489-492 ◽  
Author(s):  
Zheng Chen ◽  
Shao Peng Wu ◽  
Tao Zhang ◽  
Ling Pang
Keyword(s):  
Tensile Strength ◽  
Crumb Rubber ◽  
Point Load ◽  
Indirect Tensile Strength ◽  
Asphalt Emulsion ◽  
Mean Values ◽  
Modified Asphalt ◽  
Tension Tests ◽  
Indirect Tension ◽  
Indirect Tensile

The major objective of this research was to evaluate the tensile and fracture properties of micro-surfacing, which as a preventive maintenance surface treatment on asphalt pavement, that formed the basis for the ISSA recommendation of an optimum micro-surfacing design incorporating crumb rubber. The research involved a full-factorial experiment with different rubber contents (0, 2 and 5%) and different polymer modified asphalt emulsion contents ranged from 10 to 13% by total weight of crushed aggregate in micro-surfacing. Fracture and indirect tension tests were performed on micro-surfacing beams and Marshall test samples, respectively, at two different test temperatures of 25 and -10°C. The variables studied were indirect tensile strength, peak center-point load carried, and load-point displacement. The results show that higher mean values of indirect tensile strength were obtained corresponding to the highest modified asphalt emulsion content (13%), irrespective of rubber contents, particularly at lower temperatures. A statistical analysis of the test results reveals that there are no significant differences among the means of most of the variables studied corresponding to different rubber contents. However, the differences are significant for different asphalt emulsion contents.

scholarly journals Rejuvenation Mechanism of Asphalt Mixtures Modified with Crumb Rubber

CivilEng ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 370-384
Author(s):  
Hossein Noorvand ◽  
Kamil Kaloush ◽  
Jose Medina ◽  
Shane Underwood
Keyword(s):  
Tensile Strength ◽  
Dynamic Loading ◽  
Creep Compliance ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Indirect Tensile Strength ◽  
Laboratory Evaluation ◽  
Strength Testing ◽  
Noise Mitigation ◽  
Indirect Tensile

Asphalt aging is one of the main factors causing asphalt pavements deterioration. Previous studies reported on some aging benefits of asphalt rubber mixtures through laboratory evaluation. A field observation of various pavement sections of crumb rubber modified asphalt friction courses (ARFC) in the Phoenix, Arizona area indicated an interesting pattern of transverse/reflective cracking. These ARFC courses were placed several years ago on existing jointed plain concrete pavements for highway noise mitigation. Over the years, the shoulders had very noticeable and extensive cracking over the joints; however, the driving lanes of the pavement showed less cracking formation in severity and extent. The issue with this phenomenon is that widely adopted theories that stem from continuum mechanics of materials and layered mechanics of pavement systems cannot directly explain this phenomenon. One hypothesis could be that traffic loads continually manipulate the pavement over time, which causes some maltenes (oils and resins) compounds absorbed in the crumb rubber particles to migrate out leading to rejuvenation of the mastic in the asphalt mixture. To investigate the validity of such a hypothesis, an experimental laboratory testing was undertaken to condition samples with and without dynamic loads at high temperatures. This was followed by creep compliance and indirect tensile strength testing. The results showed the higher creep for samples aged with dynamic loading compared to those aged without loading. Higher creep compliance was attributed to higher flexibility of samples due to the rejuvenation of the maltenes. This was also supported by the higher fracture energy results obtained for samples conditioned with dynamic loading from indirect tensile strength testing.

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