What causes the structure deteriorate?

Deterioration of reinforced concrete structures can happen for a number of reasons. Physical and Chemical processes can impact durability and structural performance of the concrete. Defects in design, materials, workmanship, curing and maintenance can all impact the service life, safety and reliability of an element.

What are the types of deterioration of concrete?

Different types of Deterioration in Concrete Structures

• Different types of Deterioration in Concrete Structures.
• Corrosion of Embedded Metals in concrete.
• Freeze thaw deterioration in concrete.
• Chemical attack in concrete.
• Alkali-Aggregate Reactivity in concrete.
• Abrasion Erosion in concrete.
• Plastic Shrinkage in concrete.

Does concrete get brittle?

Concrete may be referred to as a brittle material. This is because concrete’s behaviour under loading is completely different from that of ductile materials like steel. In modern fracture mechanics concrete is considered as a quasi-brittle material.

What are the common causes which lead to form and staging failure?

Vibration and impact due to passing traffic, movement of workers and equipment on formwork, and vibration because of concrete consolidation can displace supporting shores or jacks of formwork system and cause total failure of the forms.

What is the most common cause of concrete deterioration?

Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration in concrete. When steel corrodes, the resulting rust occupies a greater volume than the steel. This expan- sion creates tensile stresses in the concrete, which can eventually cause cracking, delamination, and spalling (Figs.

What is the durability of concrete?

Durability of concrete may be defined as the ability of concrete to resist weathering action, chemical attack, and abrasion while maintaining its desired engineering properties. For example, concrete exposed to tidal seawater will have different requirements than an indoor concrete floor.

What causes crumbling concrete?

Concrete seems like a stable and permanent material, but it remains porous and will absorb water. When this water trapped inside the concrete freezes, it pushes the cement binder apart. This expansion, and the resulting contraction when the water melts again, causes crumbling.

Which compound causes disintegration of concrete?

In course of time, free hydroxide in concrete reacts with atmospheric carbon dioxide forming calcium carbonate, resulting in shrinkage cracks. These are the most common factors that cause the disintegration of concrete resulting in cracks.

What causes formwork failure?

The major causes of formwork failure are improper stripping and shore removal pattern by workers, inadequate bracing works, vibration due to machines, uneven level of soil under mudsills, and improper placing of shoring, unable to control on concrete placement during filling and lack of awareness to deep formwork …

What are the defects in concrete?

Concrete Defects

• Freeze-Thaw Effect: Concrete is very strong in compression but relatively weak in tension.
• Chemical Attack: Chemical attack can occur because concrete is alkaline and chemically reactive.
• Crazing:
• Scaling:
• Blisters:
• Spalling:
• Dusting:
• Foreign Objects:

What are the types of deterioration?

Different Types of Deterioration observed are:

• Spalling.
• Cracking.
• Debonding of the Joints.
• Erosion.
• Corrosion of Concrete Through Chemical Attack.
• Sagging of Beams and Floors, bowing or inclination.
• Excessive Efflorescence, staining or discoloration.
• Damages Due to Vibration.

What are the types of deterioration in concrete structures?

Types of deterioration in concrete structures  Distress in concrete 1. Physical 2. Chemical 3. mechanical 4. Design deficiency 5. Environmental effects  Permeability of concrete 1. Capillary porosity 2. Air voids 3. Micro cracks 4. Macro cracks 5. Dampness 6. seepage  Aggressive deterioration agents 1. Chloride 2. Sulphate 3.

What is corrosion and how does it affect concrete?

Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration in concrete. When steel corrodes, the resulting rust occupies a greater volume than the steel.

What are the main causes of stress in concrete?

Distress in concrete Physical: 1)High w/c ratio 2)Inadequate curing 3)Poorly graded aggregates 4)In adequate compaction 5)Cover thickness being lesser 6)wrong placement of reinforcement Poorly graded aggregates

What is the resistance of concrete to chemical attack?

Hence, the resistance of the concrete to chemical attack will depend on the: 1. The attack in the form of dissolution: Here, the compounds that are easily soluble can be washed out of the concrete or from the cement paste by the continuous access of the water. 2.