A kind of heat-insulating and shock-absorbing bentonite modified cement-based porous material for roadbed in frozen land area

Abstract

The invention discloses a thermal insulating and damping bentonite modified cement-based porous material for a roadbed in a frozen soil region. The material is characterized by being prepared by mixing the following raw materials: 50 to 800 parts by weight of cement, 50 to 400 parts by weight of mineral admixture, 0.1 to 300 parts by weight of bentonite, 10 to 200 parts by weight of polymer, 0 to 10 parts by weight of water reducing agent, 2 to 55 parts by weight of foam, 0 to 50 parts by weight of water-proofing agent, 0 to 50 parts by weight of fibers and 50 to 800 parts by weight of water. The cement-based porous material disclosed by the invention can replace a traditional roadbed insulation material, has excellent temperature and heat insulation properties and damping shock absorption function, and has the characteristics of controllable pore structure, workability and the like. The cement-based porous material has the advantages of low cost, capability of realizing secondary utilization and good durability, so the material is especially suitable for civil engineering construction in the frozen soil region, is used as an insulating material and a damping and energy absorbing material for protecting frozen soil and has high practicability.

Description

Technical field [0001] The invention belongs to a roadbed thermal insulation material and a shock absorption and noise reduction material, and relates to a thermal insulation and shock absorption bentonite modified cement-based porous material for roadbeds in frozen soil areas. It is especially suitable for the construction of civil engineering in frozen soil area, and is used as insulation material and shock absorption and energy absorption material for protecting frozen soil. Background technique [0002] my country's frozen soil area is about 2.15 million square kilometers, accounting for 22% of the country's land area. It is the third largest frozen soil country in the world, mainly distributed in the Qinghai-Tibet Plateau, Daxinganling, Xiaoxinganling, Tianshan and Altai regions. With the continuous advancement of my country's economic construction, major engineering constructions continue to be carried out in frozen soil areas. During the construction of the project, due t...

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Problems solved by technology

Among them, as one of the important measures to protect permafrost, the insulation materials used in passive engineering measures are mainly expanded polystyrene (referred to as EPS), extruded polystyrene (referred to as XPS), polyurethane (abbreviated as PU), etc.; Due to its inherent characteristics such as difficulty in recycling, polluting the environment, poor durability, high brittleness, poor low-temperature impact resistance, and high cost, it has short service life, long service life of roadbed, and poor stability.

[0004] Under normal circumstances, subgrade engineering in permafrost areas may also be affected by a series of factors, such as the impact of train loads, shock vibrations, blasting and other engineering disturbances. In addition, the climate in such areas is very complex, and disasters such as muddying and subsidence in subgrades are more frequent than before. More serious, seriously affecting the stability of the subgrade

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