Powder dehumidifying agent for existing roadbed and preparation method thereof

Abstract

The invention discloses a powder dehumidifying agent for an existing roadbed, which comprises the following raw materials in parts by weight: 10-40 parts of calcium oxide powder, 20-65 parts of amphoteric metal powder, 10-30 parts of sodium carbonate powder and 5-30 parts of porous auxiliary, wherein the porous auxiliary is diatomite, fly ash or activated carbon. The invention further discloses apreparation method of the dehumidifying agent. The powder dehumidifying agent can absorb a large amount of water in the roadbed during the reaction process with water, reduce pore water in a soil body, simultaneously release heat during the reaction process and generate high temperature of 40 DEG C-110 DEG C in the soil body; as the pore water in the roadbed can be gasified due to the increase ofthe temperature of the soil body, the water content and the porosity of the soil body of the roadbed are further reduced and the drainage consolidation of the roadbed is accelerated; simultaneously, the powder dehumidifying agent can generate a series of chemical reactions after water absorption, thereby expanding the volume and having good compaction effect against the roadbed under the situation of ensuring no occurrence of bulging.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to an existing roadbed powder dehumidifier and a preparation method thereof. Background technique [0002] The subgrade is an important part of the road, and it is a belt-shaped structure built according to the route position and certain technical requirements. It should bear the load transmitted from the road surface and should have sufficient strength, stability and durability. However, the highway is exposed to the atmospheric natural environment and is greatly affected by natural environmental factors. Atmospheric precipitation and surface water seep into the roadbed through the road surface, road shoulder, side slope, and slope toe; groundwater enters the roadbed under the action of capillary action and temperature gradient. , and the closure of the road surface makes it difficult for water to evaporate and lose, resulting in a large difference in the hu...

AI Technical Summary

Problems solved by technology

As for the water that exists inside the existing subgrade where the water content of the soil is greater than the optimal water content, but cannot be removed by drainage measures such as guidance and seepage, it can only be removed by diversion and drainage facilities when the water content continues to increase to flow. However, the existence of this part of water has seriously affected the bearing capacity of the subgrade. It will cost more financial and material resources to rebuild the road by excavating the road, and the construction time will be longer, which will affect the opening to traffic.