Utilization of Construction and Demolition Debris Under Traffic-Type Loading in Base and Subbase Applications

Abstract

As construction and remediation take place throughout New Jersey, the amount of construction and demolition debris increases, while the availability of landfill space decreases. A viable solution for disposing of these materials is to incorporate them into base and subbase applications. An extensive laboratory program was conducted on two types of construction and demolition debris: recycled concrete aggregate (RCA) and recycled asphalt pavement aggregate (RAP). These two materials were compared with dense-graded aggregate base coarse (DGABC), which currently is being used in roadway base applications in New Jersey. Both RCA and RAP were mixed at various percentages with the DGABC to evaluate whether an optimum mix blend could be formulated. The materials were evaluated under a traffic-type loading scheme that included resilient modulus and permanent deformation via cyclic triaxial testing. Laboratory tests indicated that the RAP, RCA, and DGABC blended materials all obtained higher resilient modulus values than the currently used DGABC. The permanent deformation results indicated that the RCA mixed samples obtained the lowest amount of permanent deformation when the material was cyclically loaded to 100,000 cycles. In contrast, the permanent deformation testing on RAP mixed samples resulted in the highest amount of permanent deformation at the same number of cycles. Existing models currently used for quarried base and subbase materials were used to predict the permanent deformation in the recycled materials. Laboratory test results indicated that these models could be used for predicting permanent deformation in unbound recycled materials.

Optimization of Building Rubbles in Flexible Pavement Using Experimental Approach and Mechanistic- Empirical Method

“…As obtained in Table7 and Fig 5 MixBR-20 achieves the highest resilient modulus at both compaction efforts, while MixBR-45 gets the lowest Mr value at both compaction efforts approximately considering that the NA mixture provides also the lowest value at high compaction effort. This result is matches with (Bennert et al, 2000) where the reused materials can provide superior values of modulus of elasticity than raw material presently utilized in pavement building. This result is possible demonstrated by the higher angle of internal friction in recycled material that has an important role in improving the shear resistance.…”

Recent Development of Recycled Asphalt Pavement (RAP) Bases Treated for Roadway Applications

“…Clary et al [7], Bennert et al [6], Cosentino et al [10], and Abdelrahman et al [2] reported the M R tests conducted on blends of RAP and aggregates commonly used for base course applications. The M R of RAP was found higher than the virgin aggregate base materials in these investigations, and the M R of RAP-aggregate blends increased with an increase in the bulk stress and the RAP content in the blends as shown in Figs.…”

“…Clary et al [7] Bennert et al [6] Cosentino et al [10] Abdelrahman et al Bennert et al [6] Clary et al [7] (c) 0% RAP -100% aggregate blends Clary et al [7] Bennert et al [6] Abdelrahman et al [2] Fig. 1 Resilient modulus versus bulk stress for the RAP-aggregate blends: a 100 % RAP-0 % aggregate blends, b 50 % RAP-50 % aggregate blends, c 0 % RAP-100 % aggregate blends Bennert et al [6] Clary et al [7] Cosentino et al [10] results obtained from Potturi [22].…”

Evaluation of Carbonation Effects on Cement-Solidified Contaminated Soil Used in Road Subgrade

“…Brooks and Cetin confirmed that using 30% recycled demolition waste and cement kiln dust to strengthen the subgrade and to prepare the subbase helps reducing the overall thickness of the pavement [25]. Bennert et al studied the performance of recycled concrete aggregate in base and subbase courses and concluded that a mixture of 25% of recycled concrete aggregates with 75% of natural aggregate has the same resilient response [26]. In China, contaminated soils in industrial sites including power plants and boiler plants which stabilized by cement were used as road materials for Shanghai, World Expo.…”