Abstract
The construction control indices were commonly used to ensure the quality of asphalt layers in the construction process. However, the relationship between the construction control indices and the low-temperature performance of asphalt layers is not clear. The purpose of this paper was to investigate the effect of the variations of the construction control indices on the low-temperature performance of asphalt mixtures to determine the key construction control indices, and propose the method for the monitoring of these indices using the Building Information Modeling (BIM) platform. The low-temperature performance of asphalt mixtures was evaluated by the semicircular bend (SCB) test. A new prediction model of critical strain energy release rate was established to evaluate the low-temperature performance of the asphalt layer. Five factors are considered for the low-temperature performance, which are the gradation and asphalt-aggregate ratio in the asphalt mixture plant, rolling temperature, gradation segregation, and temperature segregation. Orthogonal test (OT) results indicated that the order of importance of factors affecting the low-temperature performance is asphalt-stone ratio, gradation, and molding temperature. The influences of gradation segregation and temperature segregation on the low-temperature performance were quantified in this study. Furthermore, the construction control indices were monitored by the BIM platform developed in this research. In the construction process of the asphalt layer, the gradation variation caused by the segregation should be paid more attention to ensure the low-temperature performance of the pavement.
Highlights
Low-temperature cracking is one of the main distresses of asphalt pavement [1]
After the low-temperature cracks appear in the pavement, the main problem is that water will enter the pavement structure through the cracks. It will stay inside the pavement structure, weaken the strength of the base layer and the subgrade, accelerate the road damage, and reduce the driving quality [2, 3]. rough investigation, it was found that the construction quality issue of asphalt layer is an important reason for the lowtemperature cracking of asphalt pavement [4, 5]. e construction process control of the asphalt layers is mainly conducted according to the asphalt pavement construction specifications [6, 7]. ese specifications specify the items and frequency of quality inspection in the construction process, and give the requirements of the extreme value or range of the inspection items
When the width of segregation area is smaller than the rolling width, the performance of asphalt mixture in the segregation area is not clear, as shown in Figure 4(b). erefore, this paper mainly focuses on investigating the performance of the asphalt mixture in small-area segregation
Summary
Low-temperature (transverse) cracking is one of the main distresses of asphalt pavement [1]. After the low-temperature cracks appear in the pavement, the main problem is that water will enter the pavement structure through the cracks It will stay inside the pavement structure, weaken the strength of the base layer and the subgrade, accelerate the road damage, and reduce the driving quality [2, 3]. Ese specifications specify the items and frequency of quality inspection in the construction process, and give the requirements of the extreme value or range of the inspection items. These specifications do not clarify which construction control indices are related to a certain performance of the asphalt layer and the degree of influence, which causes blindness of construction. Under the same conditions, the volume parameters of the asphalt mixture are determined by these factors
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