Difference between Flexible and rigid pavement
Difference between flexible and rigid pavement
| Difference between flexible and rigid pavement | ||
| S.No. | Flexible pavement | Rigid pavement |
| 1 | Load transferred grain to grain. | No such transfer took place. |
| 2 | Durability is less as compare to rigid. | Durability is more as compare to flexible. |
| 3 | Road can be used within 24 hours. | Road cannot be used until 14 days of curing. |
| 4 | Low flexural strength. | High flexural strength. |
| 5 | Rollers are used. | Rollers are not used. |
| 6 | No thermal stresses are induced. | Thermal stresses are induced. |
| 7 | Strength depends on subgrade. | Strength does not depends on subgrade. |
| 8 | It consist four layer system(i.e. soil subgrade, sub base course, base course and surface course). | It consist three layer system(i.e. soil subgrade, base course and surface course). |
| 9 | Deformation in subgrade or lower layers transferred to upper layers. | Deformation in subgrade does not transferred to upper layers. |
Before designing flexible pavement we ensure that no layer of pavement is overstressed and the material used must be strong and durable to resist repetition of loads upto its designed life.
Various methods used for designing flexible pavement are:–
- Group index method(based on property of soil)
- California bearing ratio method
- California resistance value method(based on c- value and r-value)
- Triaxial method
- Burmister method
- McLeod method
- North Dakota cone test method( determines in-situ bearing power of subgrade).
The relationship between central point loading and third
point loading in flexural strength test?
where,
X1= Flexural strength of concrete under central point load
X2= Flexural strength of concrete under third point load.
Hence equation,
X1=X2+0.72
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