page_header_-_concrete_repairs_400

 

 

 

  abbott_point_coal_terminal_-_pic_1  abbott_point_coal_terminal_-_pic_2_01  abbot_point_coal_terminal_-_pic_3  abbott_point_coal_terminal_-_pic_4

 

Abbott Point Coal Terminal

  

 

Spalling concrete or concrete cancer, as it is sometimes referred to, is caused by the corrosion of steel in concrete. The repair of spalling concrete is technical and it is not a matter of covering exposed reinforcment. Covered areas only hide the problems and over a period of time the problem re-occurs but at a more advanced level.

 

The traditional repair methods as per Australian Standards for spalling concrete repairs are used in conjunction with the use of cementious repair motar systems integrating all of the current advanced material technologies.

 

 

  white_horses_apartments_-_pic_1   white_horses_apartments_-_pic_2   white_horses_apartments_-_pic_3   white_horses_apartments_-_pic_4  

 

White Horses Apartments

 

 

When concrete is placed it is in an alkaline state. This is the chemical state of the concrete, which acts to protect the steel against corrosion. Through weathering and a process called carbonation and/or chloride ion attack, the alkaline protection diminishes. Due to minor building movement or shrinkage of the concrete when curing or the breakdown of protective paint coatings or minimal concrete coverage over steel (or a combination of all four), cracking of the concrete occurs. 

 

The affects of carbonation and the cracks, (which are at times microscopic) allow water and air to reach the reinforcing bars where corrosion or rusting occurs. The product of the corrosion process, rust (ferrous oxide), can have a volume eight times the original volume of steel. The increase in volume exerts considerable forces on the surrounding concrete and as the concrete is weak in tension, and it breaks away. As the concrete breaks away it exposes more of the reinforcing bar to the elements, hence, accelerates the deterioration process.

 

 

  buderim_ginger_-_pic_1   buderim_ginger_-_pic_2   buderim_ginger_-_pic_3   buderim_ginger_-_pic_4  

 

Buderim Ginger

 

Repair of concrete and lining defects to the exterior and interior walls, the concrete holding tanks, the top and bottom substrates of the suspended concrete walkway directly above the tanks and concrete plinths at the base of the steel sectioned columns.

 

Although only a small amount of corrosion is first visible, the extent of the corrosion continues along the reinforcing bar and a lot of the area that requires repair is not visible. Wire ties left in the bottom of the formwork and the bottom of bar chairs can cause minor rust marks. The same corrosion process applies and damage, to the building occurs.

 

As can be seen, the more damage that occurs, the faster the deterioration, hence the name, concrete cancer. Unless treated, the problem extends at a more rapid rate. To protect the structure against future corrosion it is important to ensure that the protective coatings placed on the concrete and the concrete repairs are of a very high standard.

 

 

 

Our Services Extend the Australian Eastern Sea Board

 

concrete repairs podium
   
waterproofing