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Method for determining optimum water content of emulsified asphalt cold-recycling mixture

A technology of cold recycled mixture and optimal water content, applied in the direction of material inspection products, etc., can solve the problems of no clear theory and indicators, unreachable, cold recycled mixture design without uniform specifications, etc., to achieve improved mixing Composite performance and compaction performance, the effect of simple and easy method

Active Publication Date: 2015-06-17
SOUTHEAST UNIV
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Problems solved by technology

However, there is no uniform standard for the design of the mix ratio of cold recycled mixtures, especially the determination of the optimum water content. In the past, it was determined through experience, and its adhesion and mixing performance were observed by manual mixing. However, This method is not supported by clear theories and indicators, and only relying on observation and experience to determine the optimum water content for indoor experiments cannot achieve good results

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  • Method for determining optimum water content of emulsified asphalt cold-recycling mixture
  • Method for determining optimum water content of emulsified asphalt cold-recycling mixture
  • Method for determining optimum water content of emulsified asphalt cold-recycling mixture

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] 1) Determine the water content range and draw the compaction curve

[0029] Two typical emulsified asphalt cold in-situ recycled mixture gradations CIR-20 and CIR-13 were selected for rotary compaction experiments. The total water content includes the added water, the water content in the emulsified asphalt and the water content in the old material. According to experience, 3% water is generally added to the in-situ cold recycled mixture. In order to evaluate the impact of water content on the pressure of the cold recycled mixture Influenced by the actual characteristics, a total of five sets of test pieces were made, and 2.0%, 2.5%, 3.0%, 3.5%, 4% (accounting for the percentage of the old asphalt mixture) were selected as the added water content, and the corresponding total water content was respectively 3.28%, 3.78%, 4.28%, 4.78%, 5.2...

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Abstract

The invention discloses a method for determining optimum water content of an emulsified asphalt cold-recycling mixture. Two energy indexes for evaluating the compaction characteristic of the emulsified asphalt cold-recycling mixture are defined according to the relation between the compaction degree and the compaction times in a compaction curve of the emulsified asphalt cold-recycling mixture: a primary compaction energy index (PCEI) and a secondary compaction energy index (SCEI). The method mainly comprises the following steps: drawing a compaction curve through rotatably compacting emulsified asphalt cold-recycling mixtures with different water contents in a certain range; calculating the compaction energy indexes PCEI and SCEI according to a formula to obtain a water content corresponding to a maximal PCEI and a water content corresponding to a minimal SCEI; and finally, calculating to obtain the optimum water content of the emulsified asphalt cold-recycling mixture according to the formula. The method specifically comprises the following steps: obtaining the primary compaction energy index (PCEI); obtaining a secondary compaction energy index (SCEI); and calculating the optimum water content.

Description

technical field [0001] The invention belongs to the field of road maintenance, and in particular relates to a method for determining the optimal water content of emulsified asphalt in-situ cold recycled mixture. Background technique [0002] The in-situ cold recycling technology of asphalt pavement refers to the technology of using 100% old materials to produce recycled pavement without heating during the whole recycling process. The in-situ cold recycling technology of emulsified asphalt can protect the environment, save resources and reduce the cost of asphalt pavement. Therefore, the in-situ cold recycling technology of emulsified asphalt is more and more widely used in various regions of China. However, there is no uniform standard for the design of the mix ratio of cold recycled mixtures, especially the determination of the optimal water content. In the past, it was determined through experience, and its adhesion and mixing performance were observed by manual mixing. H...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/42
Inventor 倪富健高磊陈云卿罗海龙
Owner SOUTHEAST UNIV
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