The long-term properties of mineral-cement-emulsion mixtures

• Published in: Construction & building materials 2017-12, Vol.156, p.799-808
• Main Authors: Dolzycki, Bohdan, Jaczewski, Mariusz, Szydlowski, Cezary
• Format: Article
• Language: English
• Subjects: Analysis; Building materials; Cold recycling of asphalt pavement; Dynamic modulus; Elasticity; Evaluation; Long-term behavior; Mineral-cement-emulsion mixtures; Pavements, Asphalt; Phase angle
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2017.09.032

•Nine different mineral-cement-emulsion mixtures were tested acc. to AASHTO TP79.•The long term changes of dynamic moduli and phase angles were investigate.•Mixtures were tested in periods of 28days and 1.5year.•The mean change (increase) of dynamic moduli ranged from 9% to 14%.•The mean change (decrease) of phase angles ranged from 4% to 8%. This publication presents evaluation of long-term behavior of mineral-cement-emulsion (MCE) mixtures. MCE mixtures are among the major products of cold recycling of old asphalt pavements. They are composed by binding of the old materials reclaimed from the pavement and new mineral aggregate using two different binding agents – cement and bituminous emulsion. While bituminous emulsion dissolutes and binds materials quite fast, it does not increase the stiffness modulus of the whole mixture. Opposite behavior occurs for cement. Its effects appear slowly and all construction materials that contain cement present the increase of strength and stiffness modulus with time. Usually the increase of strength or modulus is similar for all tested materials for the same curing periods. This article investigates the impact of combination of two binding agents and their different amounts on the increase in strength and stiffness modulus of mineral-cement-emulsion mixtures with curing time. Conducted literature and laboratory studies showed that regarding the short term changes of modulus and phase angle, mineral-cement-emulsion mixtures present similar behavior to other cement-bound materials, such as cement concrete or cement-bound mixtures. In the case of long-term behavior similarities to the cement-treated materials were found as well: an increase in moduli and a decrease in phase angles were observed for longer curing times. This kind of behavior illustrates that hydraulic bonds affect both mechanical and rheological long-term properties of mineral-cement-emulsion mixtures.