A Method for Asphalt Foaming Quality Evaluation
A quality evaluation and asphalt technology, applied in data processing applications, instruments, calculations, etc., can solve the problems of the foaming index method not considering the limitation of the minimum half-life, poor accuracy, and actual inconsistency, etc., to optimize foaming conditions and improve foaming. Asphalt quality, principle scientific and reliable effect
Active Publication Date: 2022-03-22
QINGDAO UNIV OF SCI & TECH
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[0009] Among them, c ER is the expansion rate correction coefficient, and c ER =ER m / ER a ,according to figure 1 Injection times and half-lives of foamed bitumen are shown; t s is the injection time of foamed asphalt, and the unit is s; the attenuation equation adopted by this calculation method is less accurate, and when the foaming time t tends to infinity, the calculated expansion ratio of foamed asphalt is 0, which is inconsistent with the reality, and the foaming The index method does not take into account the constraints of the minimum half-life required by engineering
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Embodiment 1
[0029] The specific process of the asphalt foam quality evaluation method involved in the present embodiment comprises the following steps:
[0030] (1) By controlling the variable method, the ordinary AH-70 type asphalt is used to conduct foaming experiments under different asphalt temperatures and different water flow conditions using a foaming test machine:
[0031] Set asphalt foaming conditions:
[0032] When studying the effect of foaming water content, the asphalt temperature was set at 160°C, and the foaming water content was set at 2%, 3%, 4% and 5% of the asphalt flow rate; when studying the effect of asphalt temperature, the foaming water content was set at Set as 4% of the asphalt flow rate, the asphalt temperature is set to 160°C, 170°C, 180°C and 190°C respectively;
[0033] Preparation of foamed asphalt: Calibrate the asphalt temperature and foaming water flow rate, set the asphalt flow rate to 100g / s, set the pressure to 0.4MPa, set the foamed asphalt injection ...
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The invention belongs to the technical field of bitumen foaming quality evaluation, and specifically relates to a method for evaluating the quality of bitumen foaming, which includes two parts: experimental measurement and theoretical calculation. First, the actual expansion ratio and The half-life, and then obtain the corresponding foaming quality index through theoretical calculation, and evaluate the foaming quality. On the basis of the modified foamed asphalt attenuation equation, the two contradictory evaluation indexes of expansion rate and half-life are considered, and the minimum foamed asphalt is considered in actual engineering. Due to the limitation of expansion rate and half-life, the foaming quality index is proposed as the evaluation index of asphalt foaming quality, so as to realize the comprehensive evaluation of foaming asphalt quality under different asphalt foaming conditions, so as to lay the foundation for optimizing foaming conditions and improving foamed asphalt quality ; Its principle is scientific and reliable, and the quality of foamed asphalt under different asphalt foaming conditions is clearly given through the QI value.
Description
Technical field: [0001] The invention belongs to the technical field of asphalt foam quality evaluation, and in particular relates to an asphalt foam quality evaluation method, which can realize the comprehensive evaluation of foam asphalt quality under different foam conditions, and lays a foundation for optimizing foam conditions and improving the quality of foam asphalt. Background technique: [0002] At present, there is a huge demand for road maintenance and repair. The traditional road repair method mainly focuses on excavation and reconstruction, which not only has a long construction period and high cost, but also brings a lot of waste that cannot be disposed of. Based on this, road maintenance technology and equipment must develop in the direction of energy saving and environmental protection. [0003] Foamed asphalt cold recycling technology is to re-mix the old asphalt pavement with foamed asphalt and new aggregates in a certain proportion after excavation, recyc...
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IPC IPC(8): G06Q10/06G06Q10/00G06Q50/08
CPCG06Q10/06395G06Q10/20G06Q50/08
Inventor 刘扶民林广义鉴冉冉胡亚菲梁振宁
Owner QINGDAO UNIV OF SCI & TECH