Aeolian sand roadbed and construction method thereof

Abstract

The invention discloses an aeolian sand roadbed. The aeolian sand roadbed is characterized by including, by mass part, 100 parts of aeolian sand, 1 to 2 parts of a modifying agent and 10 to 15 parts of moist water, wherein the modifying agent includes, by mass percent, 3% to 6% of redispersible rubber powder, 26% to 30% of a tackifier, 1% to 3% of a dispersing agent and the balance water. The modifying agent can improve the adhesion property among aeolian sand particles and improve the internal cohesive force of aeolian sand, meanwhile, a layer of an emulsification film can be formed on the surface of the aeolian sand, water is prevented from entering the aeolian sand, and the water resistance of the aeolian sand is improved. The modifying agent is added in the aeolian sand roadbed construction process, the construction efficiency and compacting quality of the aeolian sand roadbed can be improved, meanwhile, the water resistance of the aeolian sand roadbed is improved, the influence ofwater on the stability of the aeolian sand roadbed is reduced, the aeolian sand roadbed construction technology is widely applied in northwest territories, cost is saved, local materials are used, the construction quality is improved, and economic, environmental protection and quality benefits are good.

Description

technical field [0001] The invention relates to road construction, in particular to an aeolian sand subgrade and a construction method thereof. Background technique [0002] In recent years, my country's northwest region has entered a stage of rapid development. The development of the region must be based on convenient transportation, and roads are the passages connecting the northwest region with external cities. At present, the construction of roads in the northwest region is in full swing, especially the third and fourth grade roads. However, the subgrade filling materials in Northwest China are limited. Aeolian sand is an extremely rich and highly regional material in Northwest China. It has no plasticity, low cohesive force, and high water permeability coefficient, so it is difficult to form, and the shear strength after forming is also low. It has the characteristics of difficult construction and strong influence of rainwater. If Gobi materials are used to replace aeoli...

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Problems solved by technology

[0002] In recent years, my country's northwest region has entered a stage of rapid development. The development of the region must be based on convenient transportation, and roads are the passages connecting the northwest region with external cities. At present, the construction of roads in the northwest region is in full swing, especially the third and fourth grade roads. However, the subgrade filling materials in Northwest China are limited. Aeolian sand is an extremely rich and highly regional material in Northwest China. It has no plasticity, low cohesion, and high water permeability coefficient, so it is difficult to form, and the shear strength after forming is also low. It has the characteristics of difficult construction and strong influence of rainwater. Currently, it is rarely used in roadbed fillers.

If Gobi materials are used to replace aeolian sand, it will cause high transportation costs, and excessive accumulation of aeolian sand will pollute the environment. How to solve these problems is a problem that engineers have been thinking about

[0003] At present, there are more and more studies on aeolian sand. A large number of studies have shown that aeolian sand has great advantages in mechanical properties as roadbed filler, but its strength decreases significantly after being exposed to water. How to solve the compaction caused by its low cohesion Difficult problems, as well as the loss of aeolian sand caused by rain and the uneven settlement of the foundation have not been properly resolved. Most of them have improved the construction technology, but the cost is high and the effect is general. Modified to improve the characteristics of low cohesion and poor water resistance, the aeolian sand can be used as roadbed filler, which not only solves the application of a large amount of aeolian sand, reduces the impact on the environment, but also reduces the cost of construction technology Optimize the increased cost, and the maintenance cost in the later stage of construction can be significantly reduced, and the economic and environmental benefits are very significant

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