EVALUATION OF SIEVE ANALYSIS METHODS FOR THE DETERMINATION OF FIBER CONTENT IN SAMPLES OF RUBBER POWDER

2012 ◽  
Vol 85 (4) ◽  
pp. 661-668
Author(s):  
Ana María Rodríguez-Alloza ◽  
Juan Gallego-Medina ◽  
José María Bermejo-Muñoz ◽  
Leticia Saiz-Rodríguez
Keyword(s):  
Weight Percent ◽  
Test Methods ◽  
Fiber Content ◽  
Sieve Analysis ◽  
Variable Parameters ◽  
Rubber Powder ◽  
Powder Samples ◽  
Sieve Analyses ◽  
Materials Used

ABSTRACT The objective of this article is to study the validity of the test methods that are currently used to determine the fiber content in samples of rubber powder made from end-of-life tires: CEN/TS 14 243, ASTM D 5603-01, and XP T 47–758. For this purpose, rubber powder samples contaminated with one weight percent (wt%) of fiber were prepared and submitted to sieve analyses, with the weight of the sample and sieving time as the variable parameters. The materials used were rubber powder without fibers and polyester fibers from recycled waste tires, both generated during the shredding of the tires. It has been observed that the procedure of determining fiber content based on sieving and extraction of fabric balls does not manage to recover more than 41.00% of the fibers contained in the samples. This research demonstrates that even with different sample weights and sieving times, is not possible to recover 100% of the fiber with which the rubber sample was contaminated. This seems to indicate that it is necessary to develop a methodology that differs from the current practice of sieving and extracting fabric balls to correctly determine the fiber content in a sample of rubber powder.

scholarly journals Evaluation of Laboratory Methods of Determination of SBS Content in Polymer-Modified Bitumens

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5237
Author(s):  
Maria Ratajczak ◽  
Artur Wilmański
Keyword(s):  
Building Materials ◽  
Test Procedure ◽  
Test Methods ◽  
Construction Sites ◽  
Modified Bitumen ◽  
Codes Of Practice ◽  
Materials Used ◽  
Industrial Samples ◽  
Styrene Butadiene

The article deals with the issue of determination of the content of SBS (Styrene-Butadiene-Styrene) in polymer-modified bitumens (PMBs). The effect of SBS copolymer on the physical and rheological properties of bitumens has been thoroughly investigated and widely described in the literature. Condition surveys of structures and evaluation of the properties of materials used at construction sites have become a huge challenge for construction engineering. Determination of the content of SBS modifier in various building materials (asphalt mixtures and bituminous waterproofing compounds) is a good example in this respect. Based on the laboratory tests, mid-infrared spectroscopy was found to be the most effective analytical method. It can be used for easy detection of the presence of SBS in a modified bitumen. However, quantitative analysis is an issue that calls for research. Currently, there are no standard guidelines, whether national or European, that would regulate the method of testing. Three test methods were assessed in this study: the AASHTO T302–15 standard method and two Australian methods described in codes of practice (T521 and Q350) developed by the local authorities, which define a standard way of determining the amount of SBS in polymer-modified bitumens. The tests were carried out on standard controls and samples sourced from the industry. The above-mentioned test methods were assessed in terms of accuracy of determination, reliability of results obtained on the industrial samples, level of complexity of the test procedure, sample preparation techniques and the type of the required reagents.

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