Large-strain flexible cement concrete and preparation method thereof, and large-strain flexible cement concrete pavement layer

Abstract

The invention relates to the field of concrete, and particularly discloses large-strain flexible cement concrete and a preparation method thereof, and a large-strain flexible cement concrete pavement layer. The large-strain flexible cement concrete is prepared from, by mass, 20-30 parts of cement, 50-60 parts of graded mineral aggregate, 3-15 parts of elastic components and 6-12 parts of water, and the elastic components comprise styrene-acrylic emulsion and rubber elastic particles. The large-strain flexible cement concrete can be used for steel bridge deck pavement, has certain strength and greatly improves the ultimate deformability at the same time.

Description

technical field [0001] The application relates to the field of concrete, and more specifically, it relates to a large-strain flexible cement concrete, a preparation method thereof, and a large-strain flexible cement concrete paving layer. Background technique [0002] Ordinary cement concrete is characterized by high strength, good water stability and low price. However, the disadvantage of cement concrete is that the ultimate deformation capacity is limited, generally only 300-500 micro-strain, when the uneven deformation exceeds the ultimate deformation capacity, the cement concrete will crack. This characteristic limits the application of cement concrete in many ways. For example, when applied as a thin layer of steel bridge deck pavement, due to the large expansion and contraction deformation of the steel box girder, the thin layer pavement is very prone to cracking of the bridge deck pavement, which in turn leads to serious problems such as water seepage of the bridge ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of cement concrete is that the ultimate deformation capacity is limited, generally only 300-500 micro-strains, when the uneven deformation exceeds the ultimate deformation capacity, the cement concrete will crack.

This characteristic limits the application of cement concrete in many ways

For example, when applied as a thin layer of steel bridge deck pavement, due to the large expansion and contraction deformation of the steel box girder, the thin layer pavement is very prone to cracking of the bridge deck pavement layer, which in turn leads to serious problems such as water seepage of the bridge deck and steel plate corrosion

Therefore, the current paving materials mostly use epoxy resin materials, and the project cost is relatively expensive.

In recent years, some researchers have used active powder concrete technology on steel bridge deck pavement to greatly increase the strength of cement concrete, but the corresponding problem is that the bridge deck steel plate needs to weld steel nail shear keys and lay steel mesh to prevent high-strength cement The shrinkage and cracking of concrete will greatly increase the construction difficulty and project cost

Images