Mr. Songtao Wei Profile

Songtao Wei

at CCCC First Highway Consultants Co., LTD.

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Proceedings Article | 22 December 2022 Paper

Pavement performance evaluation of low penetration asphalt binder in southern cities

Songtao Wei

Proceedings Volume 12460, 124604A (2022) https://doi.org/10.1117/12.2658734

KEYWORDS: Resistance, Temperature metrology, Manufacturing, Distance measurement, Thin films, Polymers, Control systems, Actuators

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Asphalt pavement is the mostly used pavement type for city streets. Its conditions and performance are critical to ensure the adequate capacity and efficiency of city traffic. Since the Chinese asphalt binder specification is penetration-based grading system, which does not provide a clear correlation with environment condition, the selection of the binder for a paving project is primarily according to local construction experience. As the rapid expansion of the traffic volume in cities, previous experience could not meet the changing demand. Severe pavement distresses could be observed on streets at the time, which is much earlier than the designed pavement life, especially near city logistics transport centers. This paper presents a study on evaluation of low penetration asphalt binder from the perspective of pavement performance at high and low temperature. Four types of binder were collected. All of them were tested according to Chinese binder specification. Further, dynamic shear rheometer (DSR) and bending beam rheometer (BBR) were used to characterize the performance of binder at high and low temperature range respectively. Rutting resistance of HMA manufactured with four types of binder were evaluated using wheels load tester at both 60℃ and 70℃. The thermal crack resistance of HMA were also evaluated and the thermal stress restrained specimen test (TSRST) were used to capture the cracking temperature. The results show that, the low penetration asphalt binder possesses the better high temperature performance, meanwhile their low temperature performance satisfies the pavement requirements in southern cities of China.

Proceedings Article | 10 November 2021 Paper

Analysis of influencing factors of construction characteristics for calcium carbide residue stabilized soil

Peilong Li, Dejian Zhu, Songtao Wei

Proceedings Volume 12050, 120503L (2021) https://doi.org/10.1117/12.2613962

KEYWORDS: Calcium, Roads, Factor analysis, Cements, Chemical reactions, Silica

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To promote the resource utilization of calcium carbide residue in road engineering, the calcium carbide residue as cementitious material was used to stabilize the two kinds of fine-grained soils. The effects of mixing method and compaction delay time on the strength of the stabilized soils are investigated by a series of unconfined compressive tests. The results show that the strength of the two stabilized soils can be increased respectively by about 42% and 23% with the same three-time addition mixing method for the wet calcium carbide residue, compared to the one-time addition mixing method. While for the dry calcium carbide residue, the strength of the stabilized soil cannot be improved with the same three-time addition mixing method. The unconfined compressive strength of calcium carbide residue stabilized soil increases first and then decreases with the time delay of compaction, and the appropriate delay time of compaction for the two stabilized soils is about 16 h and 4 h respectively. The results provide a reference for the engineering application of calcium carbide residue stabilized soil.

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