Construction method for in-situ cold recycling of foamed asphalt

Abstract

The invention provides a construction method for in-situ cold recycling of foamed asphalt. The method includes: S1) designing gradation of a synthetic mixture; S2) selecting mineral materials with optimal gradation; S3) selecting the optimal water content; S4) selecting the optimal addition amount of foamed asphalt; S5) preparing a test piece by utilizing the mineral materials with optimal gradation in the optimal water content and the optimal addition amount of foamed asphalt by rotary compaction, verifying whether the dry-wet split intensity ratio and the freeze-thaw split intensity ratio ofthe test piece meet requirements in Technical Specifications for Highway Asphalt Pavement Recycling, and if yes, determining that a ratio determined by the abovementioned steps is a preferred ratio,otherwise, returning to the step S1) to redesign gradation of the synthetic mixture; S6) performing in-situ cold recycling construction according to the preferred ratio; and S7) curing. The ratio design method overcomes limitations of the current specifications. The improvement of the process in the step S6) overcomes the disadvantages of the difficulty of aggregate adding and aggregate dusting, improves the uniformity of aggregate mixing, and is more conducive to green and civilized construction.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a construction method for in-situ cold regeneration of foamed asphalt. Background technique [0002] As of the end of 2016, the total mileage of highways in my country has reached 4.6963 million kilometers, of which the total mileage of graded roads is 4.2263 million kilometers, and the total mileage of expressway grades is 131,000 kilometers. Looking back, 10 years ago, the total mileage of highways was 3.457 million kilometers, of which The total mileage of graded roads is 2,282,900 kilometers, and the total mileage of expressway grades is only 45,300 kilometers. In the past 10 years, the increase in highway mileage is 35.85%, the total mileage of graded roads is 85.13%, and the increase in expressway grades is 189.18% %. From this, it can be predicted that in recent years, my country's kilometer repair and maintenance will enter explosive growth. [0003] The research...

AI Technical Summary

Problems solved by technology

The Marshall method has limitations, and cannot truly reflect the rubbing and rolling effects of the road roller and vehicle loads on the asphalt pavement during construction; the Marshall compaction instrument is not used enough for compaction work, and there are also disadvantages in improving the compaction work by increasing the number of compactions

Due to insufficient compactors, the resulting standard density is too small

[0020] 2. Aggregate or active materials need to be spread before regeneration mixing, the amount of spread is not easy to control, and there is dust phenomenon in fine aggregates, polluting the environment

Inaccurate or uneven addition of new materials will lead to changes in the mixture ratio, the mixture ratio will lose meaning, and construction quality problems will occur

If you want to achieve a good spreading effect, you need to add special aggregate, cement, ore powder spreading vehicles, which will increase the cost of machinery

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