Buffer anti-cracking layer, its preparation method, concrete pavement structure and its preparation method

Abstract

The invention discloses a buffering anti-cracking layer, its preparation method, concrete pavement structure and its preparation method, which consists of 100 parts by mass of cement, 120-160 parts of coarse aggregate, 120-180 parts of sand, 25-40 parts of admixture, 10-15 parts of modifier, 3-6 parts of admixture and 40-50 parts of water; the admixture is composed of bentonite, medical stone, sepiolite powder and Composed of expanded perlite; the modifier admixture is composed of polybutadiene graft, polystyrene latex and neoprene latex; the admixture is composed of superabsorbent resin, nano calcium oxide, magnesium powder, calcium sulfoaluminate, Composed of N-diethylnitrosamine and polycarboxylate superplasticizer, the buffer anti-cracking layer can effectively improve the durability of the concrete pavement structure, and at the same time improve the contact state between the surface layer and the base layer, and the preparation method is relatively simple .

Description

Technical field [0001] The present invention belongs to the technical field of concrete pavement, relates to anti-crack layer as a buffer, their preparation, and a preparation method concrete pavement. Background technique [0002] Cement concrete pavement due to its high strength, high stiffness, high capacity, wide range of sources of raw materials and adaptability to the environment, etc., countries around the world are universally applied. However, in the early construction of cement concrete pavement early damage due to the widespread problem but less than the design service life. Partly because the "just immediately +" hard contact mode, resulting in a substantial increase in impact loading concrete slab under dynamic loading of the vehicle, thereby causing impact fracture between the concrete panel and the panel base layer; the other hand, since the joint rain water infiltration at the infrastructure, so that under the repeated action of the base layer being flush vehicle ...

AI Technical Summary

Problems solved by technology

However, the cement concrete pavement built in the early days of our country generally failed to reach the design service life due to early damage.

On the one hand, due to the "rigid + rigid" hard contact mode between the concrete panel and the base layer, the impact load of the concrete panel under the dynamic load of the vehicle is greatly increased, thereby causing the impact fracture of the panel; on the other hand, due to the joint The rainwater will seep down to the base structure, and under the repeated action of the traffic load, the base will be washed away, resulting in damage to the base structure, which will cause uneven support of the panel and fracture; at the same time, under the action of temperature and humidity, the concrete panel will Warping deformation and additional stress are generated, and the failure of effective diffusion of stress and deformation will lead to panel fracture

Images