Pavement shot blasting machine can prevent bridge deck cracks and protect bridge deck
Before waterproofing the bridge deck, the concrete on the bridge surface needs to be pre-treated. This work is generally done using a pavement shot blasting machine. After the construction is completed, if the bridge deck has cracks due to construction technology or material quality, shot blasting equipment can generally be used to assist in repair, because the shot blasting process does not damage the bridge deck concrete. Compared with the milling machine, the pavement shot blasting machine can prevent bridge deck cracks and protect the bridge deck, and prevent severe mechanical impact.
Let's take a look at the types of bridge deck cracks
(1) Fine cracks. Generally, they are the initial manifestation of cracks and will develop into linear or grid-shaped cracks. The generation of such cracks is related to the quality of asphalt mixture and the vibration, deflection and stress transmission of the bridge. When there is water on the bridge deck, it will cause water to seep downward and affect the upper structure of the bridge.
(2) Linear cracks, that is, cracks that are basically distributed along a straight line along the horizontal or vertical direction of the bridge. Such cracks often appear on bridges with large deflections. Due to the vibration characteristics of the bridge, local stress concentration occurs, resulting in cracks. Such cracks will aggravate the damage of bridge deck pavement as time goes by.
(3) Grid cracks, that is, cracks develop into interconnected grid states, which are formed by the continuous development of the above two types of cracks, which will aggravate the water damage of bridge deck pavement and reduce driving safety.
(4) Large-area cracks. Such cracks are generally uniformly distributed turtle-shaped fine cracks, usually appearing on cement concrete pavement. During the paving process of cement concrete slabs, due to improper surface finishing and water collection, high temperature, poor maintenance and other reasons, the surface shrinkage cracks caused by excessive water loss on the surface of the concrete slab are generally only a few millimeters deep into the concrete surface and will not continue to develop. In addition, if the materials used undergo alkali-aggregate reaction, it will also cause large-area cracking of the pavement layer. The cracks are irregularly distributed and sometimes cause the slab to warp.