Table of Contents
- 1 What are the causes for defects in concrete structures?
- 2 What are the common defects in concrete?
- 3 What are the 5 structural problems of concrete?
- 4 What are the causes of distress and deterioration of concrete?
- 5 What is a concrete defect?
- 6 Is concrete bad for the environment?
- 7 What is the differences between concrete defects and deterioration?
- 8 What causes concrete to dust?
- 9 What are the causes of defects in concrete?
- 10 What causes cracks to form in fresh concrete?
- 11 What happens to concrete when it is corroded?
What are the causes for defects in concrete structures?
Causes for Defects in Concrete Structures
- Structural deficiency resulting from errors in design, loading criteria, unexpected overloading, etc.
- Structural deficiency due to construction defects.
- Damage due to fire, floods, earthquakes, cyclones etc.
- Damage due to chemical attack.
- Damage due to marine environments.
What are the common 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 causes concrete damage?
Concrete degradation may have various causes. Concrete can be damaged by fire, aggregate expansion, sea water effects, bacterial corrosion, calcium leaching, physical damage and chemical damage (from carbonatation, chlorides, sulfates and non-distilled water).
What are the 5 structural problems of concrete?
Problems with concrete include construction errors, disintegration, scaling, cracking, efflorescence, erosion, spalling, and popouts.
What are the causes of distress and deterioration of concrete?
Common causes of concrete distress and deterioration, including Accidental loadings, Chemical reactions, Construction errors, Corrosion of embedded metals, Design errors, Erosion, Freezing and thawing, Settlement and movement, Shrinkage, Temperature chang.
What is an example of a defect on the surface of finished concrete?
When a blemish appears on the surface of a concrete slab it will likely be one of these: blisters, cracking, crazing, curling, delamination, discol- oration, dusting, efflorescence, low spots, popouts, scaling, or spalling.
What is a concrete defect?
Defects in concrete can occur during and after construction. During construction bad consolidation can leave air voids, honey combing, or concrete may crack during curing. Visual inspections will not locate hidden flaws in a structure or measure the extent a visible defect projects into the structure.
Is concrete bad for the environment?
Taking in all stages of production, concrete is said to be responsible for 4-8% of the world’s CO2. Half of concrete’s CO2 emissions are created during the manufacture of clinker, the most-energy intensive part of the cement-making process. But other environmental impacts are far less well understood.
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 differences between concrete defects and deterioration?
Defects may be broadly divided into those due to the construction, due to environmental attack or due to the loads applied to the structure. ‘Deterioration’ refers to a more general loss of performance.
What causes concrete to dust?
WHY Do Concrete Floors Dust? A concrete floor dusts under traffic because the wearing surface is weak. If the humidity is relatively high, water will condense on the freshly placed concrete, which, if troweled into the surface, will cause dusting.
How polluting is concrete?
Taking in all stages of production, concrete is said to be responsible for 4-8% of the world’s CO2. Half of concrete’s CO2 emissions are created during the manufacture of clinker, the most-energy intensive part of the cement-making process.
What are the causes of defects in concrete?
Causes of defects in concrete structures can be broadly classified as: Structural inadequacy resulting from errors in, loading criteria, design, unexpected overloading, etc. Structural inadequacy due to construction defects. Harm due to fire, floods, earthquakes, cyclones, etc. Harm due to marine environments.
What causes cracks to form in fresh concrete?
Concrete Defects Concrete Defects CB 557 Inspection, Maintenance and Repair of Structures Dr. Karim Helmy FRESH CONCRETE DEFECTS CB 557 Notes by Dr. Karim Helmy Shrinkage Cracks •Caused by evaporation of mix water in fresh concrete, the extent of which will depend on –The amount of water in concrete increasing water
What causes white spots on the surface of concrete?
Efflorescence is the formation of deposits of salts on the concrete surface. Formed salts generally white in color. It is due to the presence of soluble salts in the water which is used in making concrete mix.
What happens to concrete when it is corroded?
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. 1 and 2).