Characteristics of bituminous binders utilizing pulverized rubber and its use for bitumen modification
Abstract eng: The use of crumb rubber is in road construction a well established technology, whereas in the last decade various technical solutions were introduced and innovated with use of this additive or admixture mainly for the production of modified bituminous binders, which can be classified somewhere between straight-run bitumen and polymer modified bitumen based on their performance behavior and functional characteristics. Last 4 years the attention of the cooperation between the Faculty of Civil Engineering CTU Prague and two industrial partners specialized in the high-speed grinding was focused intensively on the possibility to increase efficiency of waste rubber application in bituminous binders. This should be given by a suitable treatment of rubber and the achievement of particular variants of finegrinded rubber with particle size in the range of 0–0.8 mm. Partial effort is to determine the possibility of using the disintegrator not only for milling the rubber but also to parallel mixing of bitumen with grinded rubber, i.e. achieving resulting CRmB binder in one step. For this reason experimental comparison was done with use of one source of crumb rubber. From this rubber experimental (semi-production) samples of mixed rubber-bitumen composite were prepared. At the same time also standardized production of Crumb Rubber modified Bitumen (CRmB) was done. Selected type of pulverized rubber was mixed with hot bitumen. Experimental options of bituminous binders were compared with respect to their empirical characteristics and performance-based (functional) properties. These properties contain mainly multiplestress creep recovery test, determination of complex shear modulus at different temperatures and dynamic viscosity measures. Additionally homogeneity test was done to assess storage stability of each type of proposed CRmB binder. The results have shown the importance of grading and particle shape of rubber whereas the assumption that the smallest particles lead to the best results was refuted.
Contributors:
Publisher:
Taylor and Francis Group, London, UK
Conference Title:
Conference Title:
Sixth International Conference on Structural Engineering, Mechanics and Computation
Conference Venue:
Cape Town, South Africa
Conference Dates:
2016-09-05 / 2016-09-07
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
Record appears in:
Record created 2016-09-20, last modified 2016-09-20
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