SMA mixture, and preparation method and application thereof

Abstract

The invention relates to the field of rapid restoration materials for disease asphalt pavements and application of the rapid restoration materials, and especially relates to an SMA mixture, and a preparation method and application thereof. The SMA mixture is composed of, in parts by weight, 7-8 parts of aggregate, 2-4 parts of mineral powder, 0.35-0.45 part of fiber and 2-3 parts of additives. The additives comprise resin, modified asphalt, heavy traffic paving asphalt, an asphalt regenerant and a milling material. The preparation method of the SMA mixture comprises: preparing a primary finished product of the additive, preparing a semi-finished product of the additive, adding mineral powder, adding other raw materials and stirring and performing detection, so as to obtain the SMA mixture. By combining a construction method for the asphalt disease pavement and accurately controlling the technological parameters of steps, rapid appropriate fusion among joints can be realized, the step of adding modified asphalt for filling joints in the conventional technology is avoided, the cost is reduced and the construction period is shortened.

Description

technical field [0001] The invention relates to the technical field of rapid repair materials for diseased asphalt pavement and its application, in particular to an SMA mixture and its preparation method and application. Background technique [0002] SMA mixture refers to the mixture composed of asphalt horseshoe grease filled gravel skeleton. It is a discontinuously graded mixture. It is suitable for asphalt with a large amount of asphalt, high adhesion requirements, high softening point and good temperature stability. The material has small voids, high water resistance, aging resistance and durability; SMA pavement originated in Germany in the 1960s, and was later introduced and adopted by European countries, and formulated specifications in line with local national conditions. In the 1990s, it was adopted by the United States. At the same time, the SMA pavement technology was improved to make it more in line with the needs of local climate conditions; China first adopted ...

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Problems solved by technology

[0003] For this reason, the research on SMA mixtures began to appear frequently. For example, "Steel Slag Horseshoe Grease Gravel Asphalt Concrete and Its Preparation Method" with patent number 03128388.8 discloses a replacement method for the lack of skeleton material hardness materials, and the patent number is 201110135665. X's "A Warm Mix SMA Asphalt Mixture and Its Preparation Method" discloses a kind of SMA material composition and reduces the temperature control requirements during mixing. The method of recycling raw materials, regenerating asphalt, and reducing the cost of pavement repair, the patent number is 200510018289.0 discloses the paving method of asphalt and the requirements of various numerical ranges in asphalt gradation; in addition, there are a large number of journals Papers and other non-patent technical literature have carried out research and exploration on SMA pavement materials, including SMA mixture composition and skeleton material standards and gradation value range requirements, SMA mixture preparation methods, SMA mixture regeneration, SMA processing The technical requirements of road paving, etc., among which the most reflected is how to reduce the internal toxins of SMA and the requirements of raw material composition and content. There are many studies, and they are relatively perfect. After the preparation, there are relatively few studies on how to operate in the construction process to meet the material requirements, reduce the cost of asphalt road repair and fully utilize resources, and it is not ideal

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