Defects and Damage in Building Construction (Lecture # 28)

Defects and Damage in Building Construction (Lecture # 28)​ – Video

[su_divider top=”yes” text=”Go to the top” style=”default” divider_color=”#FD8B00″ link_color=”#FD8B00″ size=”4″ margin=”15″]

Defects and Damage in Building Construction (Lecture # 28) – PDF

[wonderplugin_pdf src=”https://www.mytrustworth.com/wp-content/uploads/2020/05/Lecture-28_-Defects-and-Damage-in-Building-Construction.pdf” width=”100%” height=”450px” style=”border:0;”]

Download Civil Engineering Construction (Lecture # 28) – PDF

[su_divider top=”yes” text=”Go to the top” style=”default” divider_color=”#FD8B00″ link_color=”#FD8B00″ size=”4″ margin=”15″]

Defects and Damage in Building Construction (Lecture # 28) – Excerpt

Outlines

Concrete Defects and Damage

Concrete Damage due to Reinforcement Corrosion

Recognizing defects and probable causes

Typical times of appearance of defects

Typical times of appearance of defects

Common causes of cracking in concrete structures

Intrinsic cracks in hypothetical structure

Crack sizes

Defects due to construction

Construction defects

Construction defects

Construction defects

Plastic Shrinkage

Plastic Settlement

Autogenous Shrinkage

Crazing

Crazing

Drying Shrinkage

Cracking examples

Load-induced Defects

Structural cracks

Structural cracks

Fatigue

Defects related  environmental factors and  material properties

Weathering

Mould and moisture damage

Mould and moisture damage

Mould and moisture damage

Mold and moisture damage

Thermal expansion

Scaling

Scaling

WHY Do Concrete Surfaces Scale?

A.The use of non-air-entrained concrete  or too little entrained air.

  • Adequate air entrained is required for protection against freezing and thawing damage.
  •  

B.Application of excessive amounts of  calcium or sodium chloride deicing  salts on concrete.

  • Chemicals such as ammonium sulphate or ammonium nitrate, which are components of most  fertilizers, can cause scaling as  well as induce severe chemical  attach on the concrete surface.

https://www.armca.ca/uploads/files/Tech%20Tips/CTT2

-Scaling%20Concrete%20Surfaces.pdf

C.Any finishing operation performed  while bleed water is on the surface.

  • If bleed water is worked back into the top surface of the slab, a high water/cement ratio and, therefore,  a low -strength surface layer is  produced.
  • Overworking the surface during finishing will reduce the air content in the surface layer, making it  susceptible to scaling in freezing  conditions.

D.Insufficient curing.

  • This omission results in a weak surface skin, which will scale if it is exposed to freezing and thawing in  the presence of moisture and  deicing salts.

Popouts

Delamination

Efflorescence

Steel Corrosion

Other defects

Alkali-silica reaction (ASR)

Delayed ettringite formation (DEF)

Other damage: Fire damage

Other damage: Fire damage

Possible Sources and Effects of Masonry Distress

Possible Sources and Effects of Masonry Distress

Brick Efflorescence

Eroded Mortar Joint

Classification of the defects in wall renderings

Examples of rendering defects

Examples of rendering defects

Summary

[su_divider top=”yes” text=”Go to the top” style=”default” divider_color=”#FD8B00″ link_color=”#FD8B00″ size=”4″ margin=”15″]

Share this: