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Flexible pavements and rigid pavements are two types of roads.
Flexible pavements have an embankment thickness of 3m and large size soil particles.
Rigid pavements are made of concrete or asphalt and have a rigid structure.
Flexible pavements are more suitable for areas with high traffic loads and varying soil conditions.
Rigid pavements are more durable and require less maintenance compared to flexible pavements.
Examples ...
Discussion on DLC mix using M15 grade concrete and 12:1 aggregate cement ratio.
Minimum cement content is 120 kg per cum if flyash is more than 20%.
5 samples of cube tested for 7 days with 10MPa compressive strength.
DLC mix is homogeneous and uniform in pre mix batching plant.
DLC is carried from one place to another place covered by tarpoline.
One sample after 7 days showed 7.5 Mpa compressive strength.
The question is unclear and lacks context.
The question needs to be rephrased for clarity.
More information is needed to provide a proper answer.
It is unclear what the purpose of the DLC surfaces is.
The sub base surface compaction percentages are not relevant to the question.
The question may be related to civil engineering or construction.
The question pertains to the expected stress and restrained movement on an expansion joint with dowel bar load transfer.
Total thickness of 300mm with M40 grade concrete and 31.5mm aggregate size.
Texture strength of cement concrete is 4.5 Mpa and compressive strength after 28 days curing is 40Mpa.
Expansion joint thickness is 25mm with dowel bar load transfer to one slab to another slab.
Dowel bar is 32mm dia, 500mm lengt...
The question is about the process of laying PQC mix on DLC surface using a pre-mix batching plant and electromagnetic paver sensor machine.
Process of laying PQC mix on DLC surface
Use of pre-mix batching plant and electromagnetic paver sensor machine
Importance of proper compaction and blending
Tolerance and effect on workability
The interviewer is asking about CBR valve and subgrade for road construction.
CBR valve is generally between 3 to 15% for road construction
Clay content should be less than 8%
Sand content should be between 15% to 35%
Gravel content should be greater than 25%
CBR division of state highway develops CBR
Subgrade and aggregate should meet the CBR valve requirements
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posted on 2 Mar 2024
posted on 11 Sep 2022
I was interviewed in Aug 2022.
Bituminous laying temperature is 130-150°C and rolling temperature is 80-100°C.
Bituminous laying requires higher temperature than rolling.
Temperature range ensures proper compaction and adhesion.
Temperature can vary based on the type of bitumen and aggregate used.
Proper temperature control is crucial for quality bituminous pavement.
Material suitability criteria for aggregate in construction projects.
Aggregate size should be 26.5 mm or less.
Water absorption should not exceed 2%.
Soundness test should show Naso4 not more than 12% and Mgso4 not more than 18%.
Angle of abrasion should be less than 35% with max FI & EI less than 35%.
Equivalent weight of sand should not be less than 50%.
Aggregate should not be alkaline reactive.
MDD & MCC should be as per
The design procedure for DLC mix includes using M15 grade concrete, minimum cement content of 150 kg/cum, and achieving a compressive strength of at least 10 MPA after 7 days of curing.
Use M15 grade concrete with aggregate and cement ratio of 12:1
Minimum cement content of 150 kg/cum, or 120 kg/cum if fly ash content is over 20%
Achieve a compressive strength of at least 10 MPA after 7 days of curing
DLC mix should be hom...
The question is about the suitability of aggregate size and water absorption for PQC with a total thickness of 300mm and tolerance of +/-6mm.
Aggregate size of 31.5mm is suitable for PQC with a total thickness of 300mm and tolerance of +/-6mm.
Water absorption to GSB DLC being the same for PQC is also suitable.
The suitability of the material is important for the successful completion of the project.
The design procedure for cement concrete includes minimum cement content, strength requirements, dowel bar and tie bar specifications, and surface preparation and curing techniques.
Minimum cement content of 360 kg/cum if fly ash is more than 20%, and 310 kg/cum otherwise
Flexural strength of cement concrete after 28-day curing should be 4.5 MPa, and compressive strength should be 40 MPa
Dowel bar size of 32mm dia and 300...
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