01661036

Component

Cold recycling techniques in road engineering had a wide success in last decades, since they allow the rehabilitation of pavement structures at reduced cost while considerably reducing the environmental footprint. Such techniques can be employed with up to 100% of the old pavement, although recent studies have assessed that the moderate use of other binding agents, such as cement, in the final mixture is fundamental to confer acceptable cohesion and rigidity in the early stage. This study is on the inclusion of an alternative material in the mixture, instead of cement, such as micronized recycled glass. The research involved four different mixtures, in order to well understand the impact of the micronized glass in the mixture performance. Consequently, mixtures were respectively produced with cement, lime, lime plus glass powder, and glass powder. After a curing process of 3 days, an investigation of resilient modulus and mechanical performance in wet and dry conditions was carried out. Results showed that mixes stabilized with glass powder rather than hydraulic binders do not reach comparable performance level, because of the poor reactivity of the silica with the system bitumen/water. On the other hand, if recycled glass is combined with lime, an improved material is obtained, if compared to the mix stabilized with only lime; this can be explained by the reaction between silica and hydroxide calcium, that results in something similar to cement composition. On a side, the 3-days curing protocol resulted in an incomplete curing of the material, highlighting the fundamental importance of this aspect.

This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures.

18-02160

English

14p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References; Tables

Asphalt emulsions; Calcium oxide; Cold in-place recycling; Curing agents; Fillers (Materials); Glass; Mechanics; Modulus of resilience; Recycled materials; Tensile strength

Indirect tensile strength

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-02160

TRIS, TRB, ATRI

Jan 8 2018 10:31AM