Concrete is strong, versatile and the world’s most popular building material. It is being used in almost every construction project around the world. But even the strongest material concrete eventually begins to break down and shows several common problems.

Here we are sharing all the common concrete problems and ways to prevent or repair them.

#Discoloration

concrete Discoloration

Concrete will have the same color if you use the same mix, batch, and materials. Concrete Discoloration occurs due to below mentioned reasons:

  • Water is being added to the job site
  • Poor Workmanship
  • Variations in the concrete placing or finishing operation
  • Finishing concrete too early or too late
  • Different cement, material or calcium chloride is being added to the mix
  • Excessive, hard troweling

To prevent Concrete Discoloration, you must

  • Prepare a uniform subgrade
  • Start finishing concrete only when all water gets evaporated
  • Avoid hard troweling exterior concrete
  • Cure the concrete uniformly over the entire surface
  • Make use of liquid calcium instead of calcium chloride

#Scaling

concrete-spalling-surface

Scaling occurs when the surface of the concrete begins to break off to 2 inches and keeps flaking away. Scaling is caused by:

  • Defective Concrete Finishing
  • Inadequate Concrete Strength
  • When Water seeps into porous, non-entrained concrete being exposed to freeze-thaw cycles

Scaling can be prevented by:

  • Specifying an accurate mix design for external flat work
  • Delaying finishing operations until the standing water evaporates
  • Curing concrete effectively without using salt or other chemicals during winter
  • Don’t use a vibrating screed on high slump concrete

#Cracking

why concrete get cracked

Sometimes concrete shrinks and cracks easily. Cracking can be the result of the combination of factors such as thermal contraction, drying shrinkage, subgrade settlement and applied loads.

To prevent shrinkage and cracking of concrete, follow these steps:

  • Remove all the topsoil, soft spots and all the organic material in the subgrade
  • Design a flexible pavement of concrete that can accommodate load and movements
  • Slope the subgrade for proper drainage
  • Finish the concrete only when it has finished bleeding
  • Don’t overwork concrete surface
  • Use Fog sprays, the wind breaks and covers the entire concrete with wet burlap
  • To control plastic shrinkage, use synthetic fibers

Curling

slab_curling

Concrete Curing usually occurs when concrete shrinks more at the bottom after hardening. It happens basically due to moisture and temperature differences between top and bottom surfaces.

To prevent concrete curling, follow these steps:

  • Make use of Proper Curing Techniques
  • Use water reducing admixtures or low water content
  • Use large size of aggregate
  • Place Concrete Joints accordingly

Crazing

Crazed concrete

Crazed concrete shows a number of interconnected fine cracks. It doesn’t affect the concrete strength but Cracks can be seen when the slab is damp. Crazing occurs when cement paste comes up to the surface and shrinks unevenly.

To prevent crazing of concrete

  • Use moderate slump concrete without bleeding
  • Finish the concrete once water gets evaporated
  • Make use of broom finish instead of steel trowel
  • Never sprinkle water while finishing concrete

Follow these above mentioned tips to prevent the common concrete problems. This will maintain the durability and lifespan of the concrete.

Maple Concrete Pumping is all here, offering you high quality and well equipped concrete business for many years in Toronto, Ontario. So, if you are in search of best construction services then Maple could be an ideal choice for your construction project.

Feel free to contact us @ +1 (905) 564-6790