Preparation of cold-mixed cold-paved asphalt mixture and its construction method by using papermaking waste liquid

Abstract

The invention discloses a method for preparing a cold-mixed cold-laid asphalt mixture by utilizing papermaking waste liquor and a construction method. The method for preparing the cold-mixed cold-laid asphalt mixture comprises the following steps: mixing the papermaking waste liquor or lignin with sodium sulfite to prepare a papermaking waste liquor mixed solution; preparing an ore mixed material according to a mix proportion at normal temperature, adding into a stirring tank of a stirrer, and dry-mixing for 10-20 seconds; adding the papermaking waste liquor or lignin mixed solution, mixing for 25-35 seconds to ensure that the surface of the ore material is uniformly wetted; adding modified emulsified asphalt and mixing for 58-63 seconds to prepare a cold-mixed cold-laid modified emulsified asphalt mixture. The transportation time is determined in a way that the amount of the added papermaking waste liquor mixed solution or the mixed solution of lignin extracted from the papermaking waste liquor can be regulated according to transportation distance; the spreading speed in the construction is controlled to be 4m / min to 5m / min; rolling is started immediately after the emulsion is demulsified; the cold-laid road surface is controlled to be in use within 2-6 hours according to different laying thickness.

Description

technical field [0001] The invention belongs to the technical field of road construction materials and road construction, and in particular relates to a pavement material for roads and bridge asphalt pavement and a construction method thereof. Background technique [0002] With the continuous development of high-grade roads, asphalt pavement has become the main pavement form, and a large amount of asphalt mixture needs to be produced every year in municipal and traffic engineering. [0003] The thermal production of asphalt mixture consumes a lot of energy and also emits a lot of carbon dioxide, sulfur dioxide and PM2.5 dust to the atmosphere. [0004] The thermal production of asphalt mixture mainly uses heavy oil as fuel during the heating process of sand and gravel to heat the sand to above 160°C, and a large amount of flue gas is emitted during the heating process, mainly carbon dioxide and sulfur dioxide. At the same time, after the sand and gravel are heated, a large ...

AI Technical Summary

Problems solved by technology

[0010]2. Curing type: mainly add a certain amount of thermosetting resin such as epoxy resin, unsaturated polyester, etc., and then add curing agent to make the asphalt mixture solidify and form , the main disadvantage of this form is that it is expensive, so it is only suitable for emergency quick repairs, and it is difficult to promote it on a large scale

Therefore, it can only be used for preventive maintenance of road surfaces;

[0015]② Special machinery can only be used for on-site construction, because the emulsified asphalt demulsification time is very fast, and there is no time for transportation and paving;

[0016]③ It is greatly affected by the temperature, and it is difficult to construct at temperatures below 15°C and above 30°C

[0021] 4. Product cost should be controlled, the price of cold mix and cold spread should not be higher than that of hot mix and hot spread, otherwise it will be difficult to popularize and apply;

Images