Design method of mix proportion of warm mixed large volume recycled asphalt mixture
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A technology of mix ratio design and recycled asphalt, which is applied in computer material science, instrumentation, informatics, etc., can solve the problems of poor performance of warm asphalt mixture, achieve stable technical support, improve stability, and improve ductility Effect
Active Publication Date: 2022-05-17
宁夏睿泰天成新材料科技有限公司
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However, the performance of the obtained warm mix asphalt mixture containing recycled materials is not very good
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Embodiment 1
[0070] The selected gradation type is AC-13, and the RAP content is 65%.
[0071] A dilapidated road surface in Ningxia was planed and crushed and sieved, and the aged asphalt was extracted by the Abson method, and the gradation and performance after RAP extraction, as well as the content and performance of the aged asphalt were tested, see Table 1-3.
[0089] The selected gradation type is AC-13, and the RAP content is 75%. It is preliminarily determined that the admixture ratio of regenerant to old asphalt is 10%. The new asphalt is SBS modified asphalt I-C, and its properties are shown in Table 5. According to formula (2) and formula (3) and actual engineering experience, the amount of new asphalt is selected as 5%, and the amount of old asphalt is calculated to be about 3.8%. With the oil-stone ratio of 4.4 as the median value and 0.4% as the interval, according to the predetermined design of coarse aggregate, fine aggregate and mineral powder, the heating temperature of RAP old material is 120°C, the regenerant is added and the stirring temperature is 120°C, and the stirring time is 60S. Coarse aggregate, fine aggregate and mineral powder are added at a temperature of 130°C, and the mixing time is 50S; new asphalt is added at a temperature of 130°C, and the mixing time is 60S to prepare asphalt mixture, and the compacti...
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Abstract
The invention relates to a mixing ratio design method for warm-mixed high-volume recycled asphalt mixtures, comprising: (1) determining the engineering design grading range; (2) determining the mixing ratio of recycled asphalt pavement materials (RAP); (3) selecting New asphalt grade and rejuvenating agent; (4) Estimation of new asphalt content Pnb and its proportion to total asphalt content; (5) Mineral mix design; (6) Marshall specimen preparation and optimal oil-stone ratio determination; (7) Performance Testing. By improving the regeneration effect of the rejuvenating agent, a large amount of regeneration is achieved, and the miscibility of new and old asphalt is added as a performance index in the performance test. The regenerant includes 1-10wt% of aminoacrylate and butadiene copolymer, 1-10wt% of succinimide-succinate, 3-15wt% of nano-hydroxyapatite, 0.5-10wt% of fatty alcohol Polyoxyethylene ether phosphate and 40‑80% S800 aromatic hydrocarbon solvent oil. The design method can effectively reduce the mixing temperature, increase the miscibility of new and old asphalt, improve the long-term high and low temperature stability of RAP asphalt mixture, and the low temperature bending test failure strain capacity, which can meet the road performance of general or high-grade highways.
Description
technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for designing the mixing ratio of warm-mixed large-volume recycled asphalt mixture. Background technique [0002] Asphalt pavement regeneration technology can not only make rational use of resources, but also effectively reduce the cost of materials for road construction, and at the same time reduce the damage to the environment caused by resource mining. It is a hot technology in the industry. [0003] However, affected by the variability of RAP materials, the RAP blending ratio in my country is generally 10-25%. If the RAP blending ratio is too high, the performance of the produced recycled asphalt mixture cannot meet the requirements of the current Chinese specifications. [0004] Traditional asphalt regeneration technology includes hot mixing, and the mixing temperature of hot mixing is generally 150 ° C ~ 180 ° C, but too high a temperature will...
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