25th November 2019

wonderopolis

19

Why do you have to cut concrete?

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If you're using concrete to make a sidewalk, the shrinking concrete will cause cracks to appear as it dries. To prevent sidewalks from cracking in random spots and breaking apart, builders make lines in sidewalks. Of course, they don't just call them lines. The technical term for sidewalk lines is contraction joints.

Can you use a tile saw to cut concrete pavers?

You can cut pavers by hand (with a hammer and chisel), with a guillotine paver-splitter, or using a wet-saw with a diamond-tipped blade. But it's not very fast — each cut takes at least 20 seconds. And it's not portable, so you have to run back and forth between your patio and the saw.

How long do diamond saw blades last?

A low quality diamond blade under perfect conditions can last around 12 hours, but with improper technique or the wrong materials, this could be reduced by half or more. On the other hand, some high quality diamond blades under standard working conditions have been known to have a life of over 120 cutting hours.

1

Can you cut asphalt with a circular saw?

When using a circular saw to cut asphalt, you'll need a diamond-tooth blade with the proper venting system. When cutting masonry material with a circular saw, use a worm drive instead of a conventional saw as working with masonry material can put a high amount of stress on a saw's motor.

2

What is green cutting of concrete?

Green Cutting of Concrete is roughening of concrete surface by using high water pressure. Green cut is necessary where the shear strength or impermeability is needed specially in the construction joints.

3

What blade to cut asphalt?

With a diamond asphalt cutting blade, the exposed edge is worn away as it cuts through the asphalt. Wear on the blade exposes a new layer of grit, resulting in unabated cutting. Hard blades release grit easily while cutting asphalt. Asphalt cutting blades come in both wet and dry varieties.

4

What is a contraction joint in concrete?

Contraction/control joints are placed in concrete slabs to control random cracking. A fresh concrete mixture is a fluid, plastic mass that can be molded into virtually any shape, but as the material hardens there is a reduction in volume or shrinkage.

5

What is a saw cut?

Saw cuts are a way to generate joints in concrete. Concrete saw cuts should be done at a predetermined spacing to control cracking due to shrinkage. It is really important to cut concrete after it has obtained enough strength to keep it from raveling but before cracks could be initiated internally.

6

How often should you put expansion joints in concrete?

The following recommended tips should be observed: Maximum Joint Spacing should be 24 to 36 times the thickness of the slab. Joints should be spaced about 10 feet and a maximum of 15 feet. When using joint groove for contraction joints, the joint should be a minimum depth of ¼ thickness of the slab.

7

Do sidewalks need expansion joints?

Expansion Joints Not Needed in Sidewalk. Proper use of contraction joints at short spacings of 5 feet will allow for proper movement of the individual sidewalk slabs. Due to normal shrinkage of the concrete after placement, the slab probably will never expand and become larger than it is at the time of placement.

8

Do I need to put rebar in a sidewalk?

Most concrete sidewalks in Canada are constructed without using steel reinforcement. In fact, deformation, the main cause of concrete failure, cannot be effectively eliminated through reinforcement. (Formwork is not required for sidewalks constructed using the extrusion process.)

9

What is an isolation joint in concrete?

PROPER USE OF ISOLATION AND EXPANSION JOINTS IN CONCRETE PAVEMENTS. Isolation and expansion joints accommodate anticipated differential horizontal and vertical movements that occur between a pavement and a structure. Their purpose is to allow movement without damaging adjacent structures.

10

What is an isolation joint?

Isolation and expansion joints accommodate anticipated differential horizontal and vertical movements that occur between a pavement and a structure. Their purpose is to allow movement without damaging adjacent structures. Though the terms are sometimes used interchangeably, isolation joints are not expansion joints.

11

What is the purpose of isolation joint in pipeline?

Monolithic isolation joints. ALFA Isolation Joints serve as a positive leak proof, long lasting block against the flow of electric current in all piping systems. When you put ALFA Isolation Joints into service, you bury maintenance costs forever.

12

What is insulation joint in pipeline?

Tube Turns Monolothic Insulated Joints electrically isolate sections of pipeline to prevent corrosion caused by stray electrical currents or interference from other pipelines and power transmission cables. In addition, each joint is electrically tested to verify its insulating capability.

13

Why do we need expansion joints?

An expansion joint or movement joint is an assembly designed to safely absorb the temperature-induced expansion and contraction of construction materials, to absorb vibration, to hold parts together, or to allow movement due to ground settlement or earthquakes.

14

Why joints are provided?

The joint direction could be either along the transverse or longitudinal direction. Expansion joint: Expansion joints are provided along the transverse direction to allow movement (expansion/ contraction) of the concrete slab due to temperature and subgrade moisture variation.

15

What is the use of dowel bars?

Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it.

16

What causes the cap to pop off a bottle of orange juice?

What causes the cap to pop off a bottle of orange juice? The kinetic energy of the air particles increases, causing them to move faster and push harder on the cap of the bottle. Eventually the pressure created by the increased kinetic energy of the air particles will pop the cap right off the bottle.

17

What is the purpose of dowel bars?

Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it.

18

Why formwork is necessary?

1. Purpose and Use of Formwork. The formwork serves as mould for concrete structural components unless such mould is provided by the soil, other structural components, etc. It moulds the placedfresh concrete, which in this stage normally is viscous, to the shape specified in the drawing.

19

Can you cut concrete pavers?

Our semi-circular patio, in particular, necessitated a lot of cutting. You can cut pavers by hand (with a hammer and chisel), with a guillotine paver-splitter, or using a wet-saw with a diamond-tipped blade.

20

Can you use a circular saw to cut concrete?

Use a standard circular saw, equipped with a corundum or diamond blade, for small tasks. For slabs, it's best to cut through the top inch, then use a sledgehammer to break off the rest. The jagged edge left below the cutting line provides a good rough edge for the new concrete to bond to.

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