Reusing Jet Grouting Waste as Filler for Road Asphalt Mixtures of Base Layers

Abstract

Secondary raw materials consist of production waste or material resulting from recycling processes, currently in large quantities, which can be injected back into the economic system as new raw materials. This study proposes jet grouting waste (JGW) as filler for hot and cold asphalt mixtures applied as base layers of road pavements and investigates the physical and mechanical properties. JGW is derived from soil consolidation performed during underground roadway tunnel construction. The research compares three asphalt mixtures: (a) hot mixture containing limestone aggregate-filler (HMA), (b) HMA containing JGW (HMAJ), (c) cold recycled asphalt mixture containing JGW (CRAJ). Leaching tests of JGW and reclaimed asphalt pavement (RAP) were conducted; the best configurations of the three mixtures were determined by using the volumetric method through gyratory compaction. Three mastics with filler-to-binder ratios reflecting those of the asphalt mixtures were investigated through delta ring and ball test and frequency sweep test at 0.05% stress by using a dynamic shear rheometer. The morphology of each mixture was further investigated by scanning electron microscopy. The results showed that CRAJ with 28 days of curing time reached the indirect tensile strength (ITS) of HMA (0.73 MPa) within 14 days and, among all studied mixtures, returned the lowest cumulative strain, which was on average 30% lower than that of HMA and HMAJ. The results of this study have shown that the cold alternative mixture, CRAJ, promotes the reuse of two types of waste, RAP and JGW, as it fully meets the reference Italian Technical Standard and ensures good mixture performance in addition to conserving natural resources.

RETRACTED: Research on Fatigue Prediction Model of Asphalt Mixture with High RAP Content

“…If these old materials are simply piled up, they will not only unduly occupy otherwise usable land areas, but will also cause serious environmental pollution. However, with the advent of recycled asphalt mixtures, these waste materials can finally be put to good and efficient use [2][3][4]. The use of recycled asphalt mixture means that the old asphalt pavement materials that need to be renovated or discarded, are instead milled, recycled, crushed, screened, and then mixed with regenerant (if necessary).…”

Chemical, Thermal, and Rheological Performance of Asphalt Binder Containing Plastic Waste

“…According to the purpose of the study, to carry out the analysis on the asphalt mixture when PW is added using the dry method, it was necessary to optimize, in the first analysis, a hot mix asphalt with NB (HMA NB ) and a hot mix asphalt made up of MB (HMA MB ), with the same volumetric properties [54]. The Superpave protocol was followed for the mix design phase, adopting a gyratory compactor to make cylindrical specimens (see Figure 4b) in compliance with EN 12697-31 [55].…”

Life Cycle Assessment of Sustainable Asphalt Pavement Solutions Involving Recycled Aggregates and Polymers

“…Several researchers experimented with the introduction of waste originated from different sources into asphalt mixtures, such as construction and demolition waste (CDW) [2,3], ceramic waste [4,5], waste steel [6], reclaimed asphalt pavement (RAP) [7], plastic waste [8,9], several biomaterials [10,11], and industrial by-products [12,13]. The main goal of these laboratory investigations was to obtain eco-friendly asphalt mixtures that were also sustainable in terms of mechanical properties and durability, so as to minimize maintenance treatments and achieve cost-effective asphalt pavements in the long term.…”