What is the purpose of proof rolling?
Table of Contents
- 1 What is the purpose of proof rolling?
- 2 What is a subgrade material?
- 3 How do you do a proof roll?
- 4 Which of the following type of roller is most suitable?
- 5 What is the most commonly used material for stabilization of soils?
- 6 What should I look for in a proof roll?
- 7 What is proofproof rolling and how does it work?
- 8 What is a subgrade proof roll?
What is the purpose of proof rolling?
The primary purposes of proof rolling are to locate soft areas, check the subgrade compaction, to carry out the intent of the design, and to provide uniform support for the pavement structure.
Which of the following type of roller is most suitable for proof rolling Subgrades?
Vibratory roller
∴ Vibratory roller is most suitable for proof rolling subgrades and for finishing operation of fills coarse grained soils.
What is a subgrade material?
In transport engineering, subgrade is the native material underneath a constructed road, pavement or railway track (US: railroad track). It is also called formation level. The term can also refer to imported material that has been used to build an embankment.
What is a subgrade inspection?
Subgrade Inspection includes: Compares compaction to design specifications and standard engineering practices. Uniformity of the surface, free from pockets, voids, rocks, ruts, ice and frost lumps. Proper facilitation of water drainage through grading and / or diversion ditches.
How do you do a proof roll?
When proof rolling, we use a specific weighted piece of equipment (8T single axle truck) to slowly drive up and down over the prepared surface, checking for any deflection of the surface. This will indicate whether there are weak areas in the pavement base, that may fail during the design life of the pavement.
How do I fix my soil pump?
Soil stabilization methods include:
- Drain excess moisture out of the soils using drainage tile.
- Tilling and turning over the soil to help dry it.
- Excavation into the dirt subgrade and replacing the soil with a proper base material to help bridge the unstable soils.
Which of the following type of roller is most suitable?
Detailed Solution
| Type of Compaction Equipment | Suitability |
|---|---|
| Pneumatic tyred rollers | Preferred for silts of low plasticity; base, sub-base, and embankment compaction for highways. |
| Sheepfoot rollers | Clayey soils of moderate plasticity e.g. core of earth dam. |
| Vibratory rollers | Cohesionless soils at shallow depth. |
What is the optimum moisture content of soil?
The Optimum moisture content (OMC) or Optimum Water Content (OWC) is the moisture content at which the soil attains maximum dry density. This OMC value is with respect to the specific amount of compaction energy applied to the soil.
What is the most commonly used material for stabilization of soils?
Cement/
Cement/Lime is widely used as a soil stabilising agent. Addition of cement to soil improves the strength of the soil.
What can I use as a sub base?
‘ The most common granular aggregate sub-base is DoT (Department of Transport) Type 1 and Type 3 Limestone. They are both crushed stone: Type 1 has a maximum permitted top size of 63mm, graded down to dust; and Type 3 is an open-graded 40mm unbound mixture with a reduced amount of fines.
What should I look for in a proof roll?
Proof rolling should be conducted by a single pass in each traffic lane and the passing criteria should be a 10 deflection (i.e., that includes both recoverable and non-recoverable deformation) for new construction and K0 deflection for reconstructed or stabilized subgrade, as well as the absence of pumping and …
How do you calculate subgrade strength?
A California Bearing Ratio (CBR) test is run on soils to gauge the strength of the subgrade as compared to a dense graded aggregate. CBR is one of the major factors used in pavement design to determine how thick the pavement should be.
What is proofproof rolling and how does it work?
Proof rolling (also termed test rolling), a practice to examine the mass response of subgrade to vehicle-type loads before pavement layers are constructed, is performed by driving a selected heavy vehicle over designated areas of the soil surface.
What is a proofroll and when is it performed?
On most occasions, a proofroll is performed after density tests have been performed on sub-grade. A proof roll gives the inspector a thorough analysis of the sub-grade, instead of a pin point test location. Unfortunately there is no ASTM standard for this procedure, which often leaves this procedure to personal judgement.
What is a subgrade proof roll?
A proof roll is an assessment of the subgrade layer prior to installing overlying pavement layers. The subgrade proof roll is a visual assessment to determine if it will enable the construction of the subsequent pavement layers. There are a couple of options; one being a smooth-drum roller which is probably the most common one that we see.
Which slope was the intended proof-roll target?
The bottom slope was the intended proof-roll target. The bottom slope was the intended proof-roll target. AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features