Published: 2023-12-30

Predicting the properties of a mixture produced using “cold” technology with foamed bitumen in terms of the properties of hydraulic binder mortars

Przemysław Buczyński , Grzegorz Mazurek , Marek Iwański

Abstract

The paper presents the correlation between the mechanical properties of the mineral-aggregate mixture with foamed bitumen (MCAS) and the mechanical properties of mortars containing hydraulic binder. A significant aspect of the presented research results was an attempt to determine whether it is possible to predict the properties of the recycled cold mix with foamed bitumen (MCAS) based on preliminary results obtained for mortars. The prediction of MCAS properties through mortar properties was limited to basic mechanical properties of mortars, namely compressive strength (RC) and flexural tensile strength (Rf). To achieve this goal, seven hydraulic binders were designed with a controlled composition using a simplex-centroid experimental plan known as the mixture design plan. The components of the hydraulic binders used in its composition were Portland cement CEM I 32.5R, hydrated lime Ca(OH)2, and by-products of cement production in powder form (UCPP). The designed and prepared hydraulic binders were then used in the composition of the mineralaggregate mixture with foamed bitumen at a quantity of 3.0% (m/m). Subsequently, in laboratory conditions, the mineralaggregate mixture with foamed bitumen was prepared, and mechanical property tests were conducted, including indirect tensile strength (ITSDRY), axial compressive strength (UCS), modulus of stiffness (Sm), fracture toughness (KIC), and the dynamic modulus |E*| determined as a function of frequency and temperature. The analysis results suggest that there is potentially the ability to predict selected mechanical properties of the MCAS mixture by analyzing the mechanical results for mortars. However, this application is limited. The research results obtained for non-destructive properties, such as the dynamic modulus |E*|, are satisfactorily described by the compressive strength results of mortars after 28 days of curing. Other analyzed characteristics did not show a significant correlation.

Keywords:

cold-recycled asphalt mixture, foamed bitumen, hydraulic binder, deep cold recycling, correlation.

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Buczyński, P., Mazurek, G., & Iwański, M. (2023). Predicting the properties of a mixture produced using “cold” technology with foamed bitumen in terms of the properties of hydraulic binder mortars. Roads and Bridges - Drogi I Mosty, 22(4), 363–378. https://doi.org/10.7409/rabdim.023.019

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