Silica shows significant reinforcing and modifying effects in building materials, especially in concrete and asphalt mixtures. The following is a detailed analysis of its reinforcing and modifying effects:

1. The reinforcing and modifying effect of silica in concrete

Improving strength and durability:

Silica can react with calcium silicate in the cement matrix to make the micropores in the concrete more uniform, thereby improving the compressive strength and tensile strength of the concrete.

By reducing the number of pores in the concrete, silica can reduce the water absorption of the concrete and prevent water intrusion, thereby slowing down the aging of the concrete and improving its durability.

Improving construction performance:

Silica can promote the dispersion and fluidity of concrete, reduce the viscosity and deformation rate of concrete, improve its fluidity, and increase the ductility of concrete construction.

As a plasticizer and dispersant, silica can make the water in the concrete dispersed evenly and improve the density and uniformity of the concrete.

Improve the appearance texture: Due to the special material and color of silica, it can increase the transparency and whiteness of concrete, making the concrete have a more beautiful appearance. The fine particles of silica can fill the pores in the concrete, enhance the density and durability of the concrete, and also help reduce sunlight reflection and mitigate the urban heat island effect.

2. The modification effect of silica in asphalt mixture Enhance the performance of the pavement: Adding silica to the asphalt mixture can replace a certain volume of the matrix, reduce the void ratio of the mixture, and increase the density of the mixture. Silica can enhance the water stability and fatigue resistance of the pavement, so that the pavement exhibits good wear resistance and anti-skid properties. Improve chemical stability: The main component of silica, silicon dioxide, is an inert substance with excellent chemical stability and is not afraid of oxidation and acid-base corrosion. This chemical stability helps to enhance the stability and aging resistance of asphalt pavement.

3. Modification and industrial application of silica Modification treatment: In order to improve the industrial application performance of silica, it is usually necessary to perform surface modification before application. Modification methods include surface grafting modification, coupling agent modification, ionic liquid modification, macromolecular interface modification and combined modification. Among them, coupling agent modification has become the mainstream choice due to its significant effect.

Industrial application:

Modified silica has a wider application prospect in building materials.

It can be used as an important additive to improve the quality and service life of concrete and asphalt mixtures.

In summary, silica shows significant enhancement and modification effects in building materials, which is of great significance for improving the performance of building materials, extending service life and improving the overall quality of buildings.