Additive, water-stable base layer applying same and preparation method of water-stable base layer

Abstract

The invention discloses an additive, a water-stable base applying the additive and a preparation method of the water-stable base, and belongs to the technical field of highway pavement construction. The additive is prepared from the following raw materials in parts by weight: 10 to 20 parts of hydration inhibition and slow release type water-absorbent resin, 30 to 50 parts of magnesium oxide, 5 to 10 parts of calcium oxide, 5 to 10 parts of sodium hydroxide, 10 to 20 parts of sodium sulfate, 0.1 to 0.6 part of retarder, 0 to 5 parts of sodium bromide, 0 to 10 parts of nano calcium silicate and 0 to 10 parts of nano silicon dioxide. The additive disclosed by the invention can be used for improving various properties of the cement-stabilized base after a high-mixing-amount admixture is added to replace cement, prolonging the construction time of the corresponding cement-stabilized base and improving the economic benefit.

Description

technical field [0001] The invention relates to an admixture, a water-stabilized base layer using the admixture and a preparation method thereof, belonging to the technical field of highway pavement construction. Background technique [0002] The water-stabilized base is the abbreviation of the cement-stabilized macadam layer, that is, the graded macadam is consolidated with cement and completed through compaction and maintenance. "Technical Specifications for Construction of Highway Pavement Base" (JT J034-2000) stipulates the delay time between adding water and mixing cement stabilized aggregates to the end of rolling: no more than 2 hours for centralized factory mixing, no more than 2 hours for road mixing 3~4h. This is difficult to achieve for some units with unsatisfactory construction equipment and organizational management conditions. Especially with the implementation of the ISO standard for cement, when the strength grade of cement is improved, the fineness is fin...

AI Technical Summary

Problems solved by technology

However, the application effect of fly ash and other admixtures in cement-stabilized macadam failed to meet the above expectations, mainly in the following aspects: the requirement of 7d strength of cement-stabilized macadam limits the amount of fly ash, due to the early stage of fly ash The activity is low, and it can only be used as a low-volume filler in the cement-stabilized crushed stone layer, without its pozzolanic effect, and its economic benefits are limited

[0004] At present, there are studies to stimulate the early activity of fly ash by adding various chemical reagents, but the stimulation effect is not ideal. The maximum amount of fly ash can only reach 30-50%, and it needs to Increasing the amount of cement also weakens the economic benefits of replacing cement with fly ash and other admixtures

Therefore, in the existing cement-stabilized crushed stones, if admixtures such as fly ash are used to replace cement, there are still problems such as low fly ash content, poor early strength, short construction time from mixing production to rolling completion, and 7 days of moisturizing and curing. After the volcanic ash effect occurs and the later active reaction still needs maintenance, the cement-stabilized gravel shrinks and deforms greatly and is easy to crack, etc.

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