Design and Mechanical Properties of Liquid Rubber-Based Concrete

Abstract

A new type of concrete was developed using liquid rubber (polyurethane) as binder and graded stones as aggregate. The mechanical properties of the prepared liquid rubber-based concrete (LRBC) were systematically investigated through flexural and compressive tests. The dynamic response of LRBC to impact was studied using a spit Hopkinson pressure bar system, which demonstrates a non-monotonic strain rate sensitivity of LRBC. Furthermore, three typical pavement performance tests, i.e., rutting, seepage and sanding tests, were carried out to evaluate the potential of LRBC for the applications in pavement systems. According to the experimental study, the optimum rubber-aggregate ratio was found to be 17% (weight of binder by that of aggregate). The LRBC prepared with this recipe showed the superiority in most pavement performance indicators to other three types of conventional asphalt concrete.

Towards storage-stable high-content recycled tyre rubber modified bitumen

“…LR is actually a family of semi-solid/fluid materials composed by a very high-percentage of RTR plus other oils. In the recent past some LR was used in concrete [14] as well as bitumen modifier by Fini et al [15] who tested blends of bitumen and 15% LR showing that it can enhance its low-temperature characteristics but adversely affects the base bitumen elasticity and thus its resistance to rutting. This investigation goes a step further and investigates the potential of maximising the re-use of RTR in bitumen modification by incorporating LR as modifier in proportions from 5% to 60%.…”

Nano-Impact Tests with Ultra-High Strain Rate Loading Using Graphene and Ion Impact

“…Over the past century, various tests have been invented to investigate the mechanical responses of materials at different strain rates. Commonly adopted high strain rate tests have included the split-Hopkinson pressure bar (SHPB) [Liu et al, 2013;, the plate impact test [Liu et al, 2014] and the pressure-shear plate impact test [Klopp et al, 1985]. These high strain rate testing schemes are mainly designed for macro-scale behavior and the strain rates are limited to 10 4 -10 5 s −1 [Liang et al, 2016] for the miniaturized SHPB bar test and 10 5 -10 7 s −1 for the pressure-shear plate impact test [Ramesh, 2008].…”