Research on Application of Warm Mix Asphalt Technology in Hot In-Place Recycled Engineering

Abstract

Because of the heating limitation of old pavement and the restriction of climate, the quality of hot in-place recycled pavement was different to control. The warm m,ix asphalt technology was introduced to improve the heterogeneity and compactness of the hot in-place recycled pavement and decrease its construction temperature. The compaction characteristics of warm in-place recycled asphalt mixture were analyzed and its molding temperature was determined through the Marshall test. The pavement performance of warm in-place recycled asphalt mixture was analyzed whose results indicated that the introduction of warm mix asphalt technology was able to improve the compactness, the high temperature stability and water stability of hot in-place recycled asphalt mixture and reduce the influence of environment over its construction quality. A warm in-place recycled engineering of Shian expressway was introduced to verify the feasibility of warm in-place recycling technology which demonstrated that the warm in-place recycling technology was able to improve the heterogeneity and compaction quality of the recycled pavement and weaken the environmental pollution.

Study of Decay Mechanisms and Rules of Recycled Asphalt Pavement via a Full-Scale Experiment

“…The specimens are shown in Figure 10. Under room temperature, an asphalt mixture exhibits significant viscoelastic properties [9]. With the increase in the number of loads, the specimen's flexural residual deformation gradually increases, the stiffness (or modulus) of the material gradually decreases, micro-cracks continuously develop, and, finally, there is a complete fracture.…”

“…Most of the roads built in the early stages of development have gradually entered the maintenance period. Asphalt pavement recycling technology conforms to the concept of sustainable development and green highway construction and is gradually being popularized and applied [6][7][8][9].…”

Study on Pavement Performance of Warm Mix Asphalt with DAT

“…Considering the disadvantages of HMA, scholars all over the world propose warm mix asphalt (WMA).WMA has more advantages comparing to the HMA in terms of environmental protection and energy consumption. Studies have shown that WMA can decrease 30°C in mixing and construction than HMA [2] and 20%~30% fuel costs [3]. In addition, each reduction of 10°C, about 0.9kg carbon dioxide emission per ton can be cancelled in the asphalt mixture production process [4].…”