Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology

Abstract

This study examined the physical properties of a three-component mineral binder that is typically used in deep-cold recycling. Test binders were produced using Portland cement, hydrated lime, and cement bypass dust (CBPD) as a byproduct derived from cement production. The suitability of CBPD for use in road binders was assessed. Effects of the three-component binder composition on the setting time, soundness, consistency, and tensile and compressive strengths of the cement pastes and mortars were determined. The pastes and mortars of the same consistency obtained at different w/b ratios were tested. On this basis, the mixture proportions resulting in road binders satisfying the requirements of PN-EN 13282-2:2015 were determined. By mixing cement, lime, and CBPD during the tests, binder classes N1 to N3 were obtained. The replacement of 40% of cement mass with the CBPD high in free lime produced road binders suitable for recycled base layers. The total content of CBPD and hydrated lime in the road binder should not exceed 50% by mass. The potential risk of mortar strength reduction due to KCl recrystallization was discussed.

Thermal Analysis-Based Field Validation of the Deformation of a Recycled Base Course Made with Innovative Road Binder

“…Although the CBPD component had a significant but the lowest influence on the optimisation solution, its interaction with hydrated lime appeared to be very strong. These results are consistent with the findings reported in [28]. According to this, hydrated lime acts as a stabiliser for the swelling due to the presence of GPBG in a blended binder.…”

“…The sum of the mixture's components could not be greater than 100%. More detailed information on the impact of the three-component binder on the standard mortar properties and chemical composition is available in [27,28].…”

The Impact of Water and Road Salt with Anti-Caking Agent on the Stiffness of Select Mixes Used for the Road Surface

“…This binder consisted of 40% CEM I 32.5R cement, 20% hydrated lime (Ca(OH) 2 ), and mainly 40% dusty cement byproducts. Mixes containing this binder have been optimized for composition and material properties in previous research work [ 22 , 23 , 24 , 25 ]. Table 1 presents the detailed compositions of the analyzed mixes.…”

Research on the Properties of Mineral–Cement Emulsion Mixtures Using Recycled Road Pavement Materials

“…Improvement of the properties of recycled mixes can be achieved not only by appropriate additives [ 44 , 45 ] but also thanks to “carbonization,” which improved mechanical properties and resistance to dry shrinkage for mixes containing recycled concrete aggregate (RCA) [ 46 , 47 ]. The carbonation process is relatively long but provides a more effective yield improvement.…”