Abstract
The paper presents the results of tests of the impact of hydraulic and bituminous binders on the properties of the cold-recycled mixture (CRM). The composition of the cold-recycled mixture includes two types of different binders, i.e., bituminous binder in the form of foamed bitumen and bitumen emulsion, as well as Portland cement (CEM I 32.5R) and hydraulic binder. The hydraulic binder was produced by mixing three base ingredients in the following ratio: 40% CEM I 32.5R; 20% Ca(OH)2 and 40% CBD (cement bypass dust). The cold-recycled mixtures were produced under industrial conditions on a test section. The prepared CRM with bitumen emulsion (MCE) and foamed bitumen (MCAS) was collected from the test section and compacted under laboratory conditions. The impact of the type and kind of the binder was assessed in terms of physical properties, mechanical properties and deformation modulus (bearing capacity of subbase) of the recycled base course after 1, 7 and 28 days. It was found that the use of hydraulic binder in the recycled base course, regardless of the type of bituminous binder, reduced cohesion without reducing the remaining parameters.
Highlights
Global environmental policy contributes to the development and use of technologies that ensure the smallest possible energy consumption, reduced pollution and less environmental degradation [1].Many industry branches generate significant pollution due to the overproduction of by-products [2].Such processes include, for instance, the construction of roads, which involves many types of works related to the demolitibnbon of damaged pavements
Common methods employed to re-use waste materials include deep cold recycling with foamed bitumen [5] (MCAS) and bitumen emulsion (MCE) [6,7]
Bituminous binders included foamed bitumen and bitumen emulsion. Both foamed bitumen and bitumen emulsion were produced from 70/100 penetration grade bitumen for roads
Summary
Many industry branches generate significant pollution due to the overproduction of by-products [2]. Such processes include, for instance, the construction of roads, which involves many types of works related to the demolitibnbon of damaged pavements. Waste reduction is achieved through the use of recycling technologies [3,4]. Common methods employed to re-use waste materials include deep cold recycling with foamed bitumen [5] (MCAS) and bitumen emulsion (MCE) [6,7]. The cold recycling technology assumes the construction of the road base with the use of materials from the demolition of old pavement structures.
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