Concrete is a composite building material used in construction. It is made from a combination of aggregate, such as gravel and sand, and cement binder. An interesting fact about concrete is that, while most people assume that concrete solidifies because it dries after mixing and pouring, it actually does not. Instead, concrete undergoes a process called hydration, in which, rather than solidifying because of water evaporation, it solidifies due to the chemical gluing of the components together forming a stone-like material. Concrete is commonly used to make building foundations and structures, pavements, parking lots, and bricks. Over time, many concrete constructions will need repair or restoration. In these cases, it is a good idea to call in professional concrete repair and restoration services.

Contractors can polish concrete using wet or dry methods, but typically they use a combination of both.

The wet process uses water to cool the diamond abrasives and eliminate grinding dust. Because the water reduces friction and acts as a lubricant, it increases the life of the polishing abrasives, particularly the ordinary resin-bonded disks, which can melt at high temperatures. A disadvantage of the wet process is the mess. Crews must collect and dispose of the slurry that's generated, which slows productivity.

Dry polishing requires no water. Instead, contractors use machines equipped with dust-containment systems that eliminate virtually all of the mess. Typically dry polishing is used for the initial grinding steps and fine polishing steps, when more concrete is being removed. As the surface becomes smoother, and crews switch from the metal-bonded to the finer resin-bonded diamond abrasives, they generally may have to change to wet polishing. However, some manufacturers have introduced resin-bonded disks that are designed to withstand the friction of dry polishing, allowing the entire process to be done dry, like dry-polishing concrete disks supplied by metool.

A: Rotate the saw blade without cutting: Especially when first- time using the new saw blade, the blade should be rotated without cutting for over 30 minutes, and should be used with water in summer hot weather . The purpose is to eliminate the influence of segment to the saw blank during the welding course, and keep high internal quality memory when the saw blades is running under high speed. 

B: The stone block should not be smaller than 0.5m3, and which should be settled steadily in symmetrical position to avoid any vibration. 

C: According to the length, width, and height of stone block to adjust the runing switch, the rise and fall of saw blade or the block vehicle should be in valid range. Before the cutting the distance between segment and the highest position of stone block should be 10-20mm. After the cutting the distance between the segment and the bottom of stone block should be 20-40mm. When the cutting of saw blade is changed from left to right or right to left, the blade should be out of stone block completely, the distance should be at least 150-200mm to avoid the strike of blade to the block.  

D: The saw blade can only cut the block after steady rotation, when the segment is touching the stone block the saw blade can not be loaded to run(rotate), also when the blade is under cutting in the block the ratation can not be stopped until the blade is out of block completely. 

E: Under cutting if find the stone block is vibrating, please stop the cutting immediately, only when the block is settled steadily the cutting can be continued. Under cutting the stone block can not be moved freely. 

F: Under cutting if find any unnormal low cutting speed or the blade is nipped, it is possible that the strap is sliding or the compaction nuts become less crowded or the cutting depth

is too much or the feed speed is too fast, which concerned should be adjusted in time. 

G: The leaner speed should be adapted to the hardess and the type of abrasive of stone, 

we suggest the following leaner speed according to different type stone. 

H: Feed Speed, this is depend on the perforamnce of cutting tools usually means the quality

of segment. every type tool when the cutting depth is confirmed then the feed speed has its own range. If the speed is too high, then the diamond of segment will be exhausted quickly even fall form the bond, then the life of the segment will be short. If the speed is too low, then the blade's sharp-self course can not be conducted normally so that the blade become blunt to lose cutting ability. As usual, the feed speed should be slow when the blade enter the cutting, and average when it is cutting. Regarding normal typical material, when the cutting depth is 6mm, we recommend the following list of feed speed for your reference, when the thickness is changing, the cutting speed can be calculated with cutting area(cm2/min).

Please note: The feed speed of initial cutting or the first three cutting course of every piece slab should be half of usual speed.

I: Regarding the cutting depth of medium hard stone such as marble, limestone which can be cut out one time, as to hard or abrasive stone such as granite, sandstone which should be cut for more times. By using single blade to cut granite, as usual the cutting depth is 4-8mm, cut marbel the cutting depth is 15-30mm, multi-blades two sides cut hard granite, the cutting depth is 3-5mm, anyhow, the cutting depth should be decided by the the hardness of stone, the performance of saw blade and cutting machines.

J: If the rotation direction of the saw blade is same as the movement direction of stone,

we call it same-direction-cutting, otherwise we call it contradict-direction-cutting. When the cutting is under contrary direction, there is a rising vertical strength which makes a trend of lifting up the stone block. So, in order to make the block steady, under same cutting conditions, should try to use same-direction-cutting. When under contradict-direction-cutting the cutting depth should be reduced, as usual it should be 1/3-->1/2 of same-direction-cutting depth.

K: Sum up the above mentioned, the basical requirement of cutting technics is: regarding

soft hard for easy cutting stone, the cutting can be slow with deep cutting depth, as to the hard stone the cutting is just contrary. To the same type stone and corresponding cutting machine & saw blade, the cutting parameter should be subjected to high efficiency, good quality slab, long life of segment and saw blade, this four points is relevant. When the cutting speed of the saw blade can not keep in a certain number, this means the blade is blunt, should reduce the cutting depth and increase the feed speed to make the blade sharp.

L: Recommended cutting technics of Multi-blades for reference:

Electroplated Diamonds:

The electroplating process entraps the diamond crystals in a layer of nickel-based plating material. This process typically requires the tool blank to be inserted into a bed of loose diamond crystals in a plating tank while an electrical circuit is established within the fluid of the tank to electrically deposits the plating material onto the tool blank. This process bonds the diamonds to the tool blank and provides a more uniform coating of diamonds.

Brazed Diamonds:

The diamonds in brazed diamond tools are physically bonded to the tool blank. This is accomplished with a layer of special brazing metal that is adhered to both the tool blank and the diamond crystals with intense heat. Since all of the diamond crystals are not the same distance from the tool durring the electroplating process, some diamond are more exposed than others on the finished tool.