Feasibility Evaluation of Preparing Asphalt Mixture with Low-Grade Aggregate, Rubber Asphalt and Desulphurization Gypsum Residues

Abstract

Road construction consumes great amounts of high-grade natural resources. Using low-grade natural rocks or some solid wastes as substitute materials is a hot topic. Considering this, the feasibility of using low-grade granite aggregate, solid waste-based filler (desulphurization gypsum residues, DGR) and binder (waste tire rubber modified asphalt, RMA) simultaneously in asphalt mixtures has been fully investigated in this research. The commonly used base asphalt and limestone powder (LP) filler were control groups. Material characteristics of raw materials mainly including micro-morphology, functional group, mineral phase, chemical composition and thermal stability were first evaluated in order to recognize them. Four asphalt mixtures (two asphalt binder and two filler) were then designed by standard Superpave method. Finally, a detailed investigation into the pavement performance of asphalt mixtures was carried out. The moisture damage resistance and low-temperature crack resistance were detected by the changing rules of stability, strength and fracture energy, and the high-temperature stability and fatigue performance were determined by wheel tracking test and indirect tensile (IDT) fatigue test, respectively. Results suggested that RMA and DGR both showed positive effects on the low-temperature crack resistance and fatigue property of the granite asphalt mixture. DGR also strengthened moisture stability. The contribution of RMA on high-temperature deformation resistance of the granite asphalt mixture was compelling. It can offset the insufficiency in high-temperature stability made by DGR. A conclusion can be made that asphalt mixture prepared with granite, DGR and RMA possesses satisfactory pavement performances.

Effect of Diatomite and Basalt Fibers on Pavement Performance and Vibration Attenuation of Waste Tires Rubber-Modified Asphalt Mixtures

“…e fitting results are also shown in Figure 5, and Figure 5(h) shows the variation of the exponential decay rate (damping coefficient ε r ) with the content of diatomite and basalt fibers. As can be seen from Figure 5, the correlation coefficients R 2 of exponential equation (12) for fitting the envelopes of vibration acceleration attenuation of seven groups of WRM are greater than 0.97, which shows that the exponential equation can well characterize the vibration attenuation of these asphalt mixtures. According to the fitting results of the damping coefficients ε r , it can be calculated that, compared with WRM, the damping coefficient ε r of DWRM with 5 wt.%, 7.5 wt.%, and 10 wt.% diatomite and BWRM with 0.2 wt.%, 0.3 wt.%, and 0.4 wt.% basalt fibers increases by 40.22%, 104.37%, 152.01%, 101.21%, 183.14%, and 216.02%, respectively.…”

“…Using waste tires rubber (WR) in road engineering materials can not only protect the environment and save resources but also improve the mechanical properties of pavement materials and reduce vibration and noise on the road [2,[5][6][7][8][9]. Some studies pointed out that the addition of WR to the asphalt mixtures could improve the performance of antideformation at high temperature and anticrack at low temperature [6,[10][11][12]. And WR also enhanced the hightemperature performance of desulphurization gypsum residues modified asphalt mixtures [12].…”

“…Some studies pointed out that the addition of WR to the asphalt mixtures could improve the performance of antideformation at high temperature and anticrack at low temperature [6,[10][11][12]. And WR also enhanced the hightemperature performance of desulphurization gypsum residues modified asphalt mixtures [12]. In addition, the fatigue performance of WR modified asphalt mixtures (WRM) had been studied by using the semicircular bending tests and flexure beam tests, and the results showed that the WRM exhibited better fatigue performance compared to the nonreinforced mixtures [7,[13][14][15].…”

Improving the Environmental Sustainability of Low Noise Pavements: Comparative Life Cycle Assessment of Reclaimed Asphalt and Crumb Rubber Based Warm Mix Technologies

“…Besides WMA technologies, several materials such as recycled glass [28], fly ash derived zeolites [29], boron waste [30], recycled ceramic aggregates [31], desulphurization gypsum residues [32], and recycled polymers [33] have been investigated as asphalt additives or road base materials. Crumb rubber modified (CRM) represents a valuable solution to fulfill high environmental standards.…”

Special Issue of Environment-Friendly Construction Materials

“…Andrzejuk et al [33] and Ogrodnik et al [34] reported their research on reusing the wastes of sanitary ceramics as aggregates for asphalt mixture and cement concrete, respectively. Waste concrete powder [35], low-grade aggregate [36], crumb rubber waste [37], and recycled concrete aggregate [38] were also successfully reused as construction materials. In the study by Li et al [39], the reclaimed asphalt pavement was reused 100% in cold recycled asphalt mixtures.…”