| In construction engineering, the concrete structure plays a very important role, but the concrete structure of leakage problem in engineering has not been solved effectively. Penetration performance will directly affect the durability of the concrete structure, for control of water infiltration rate, permeability and the water may contain corrosive chemicals, and erosion of concrete and lead to corrosion of reinforcement. T he leakage of concrete damage light to speed up the aging of concrete, the development of the disease, or lead to the destruction of buildings and even crash.Development of waterproof materials in China started late, the standard also not too perfect, but particularly rapid development. So far, our country has waterproof materials from organic waterproof material such as asphalt linoleum unify t he whole country, development to today’s two main waterproof materials: flexible waterproof materials and rigid waterproofing materials. Flexible waterproof materials is through in the concrete surface to form a layer of hydrophobic protective layer, preve nt moisture infiltration inside the concrete, but its generally for organic material, use fixed number of year for a maximum of 20 years or so, belong to "treats" approach; Rigid waterproofing material is cement, gravel, sand, etc as raw material, add a sm all amount of additive, make inside the concrete more dense, or to improve the permeability of concrete by using the method of compensating shrinkage performance, to achieve the effect of crack permeability, due to the material generally for inorganic materials, service life is long, is a way to "cure". In the back of concrete surface daub rigid waterproof material, such as interior wall of high-rise building and subway tunnel, is to meet the water construction operation more convenient, is a kind of very effective solution to the problem of leakage.This article summarizes the existing some anti the leakproof method, compares the advantages and disadvantages between them, and put forward the back surface of the concrete methods of high performance cement co mposite mortar daub to improve the permeability resistance of concrete., this experiment adopts the LX- 3 additive is the anti-permeability label method, test method used in the seal of the block, solved the traditional sealing methods such as difficult operation, the environmental pollution caused by the shortcomings, puts forward the method of epoxy resin adhesive sealing, and the preparation of epoxy resin adhesive is obtained by experiment, adhesive glue(modified epoxy resin) and B(modified polyamid e resin) the best mixture ratio.Test is based on three block seeping in time and permeability grade as a standard for evaluation of permeability in concrete. Respectively studied the dosage of additives and the thickness of composite cement mortar daub th e influence of permeability resistance of concrete, through the map coordinates, the size of the analysis of the influence of various factors on the impermeability of concrete. Additives are analyzed theoretically in the water reducing agent, expansive age nt and the influence of the short fiber against seepage.Permeability method studied in the text belongs to one of the rigid waterproofing, waterproofing material belongs to inorganic material, has the very good durability. And the construction is simple, low cost, is a very practical waterproof technology. T his method also has the very strong practical application value in engineering, can for the construction of waterproof engineering provides a new method for reference, have great significance for actual engineering. |
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