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SOIL TESTING EQUIPMENTS :- • What are the necessary...
CARRIAGE & SUPPLY OF MATERIALS PART-1 :- • HOW TO CALCULATE THE C...
DIFFERENT FORMS OF BITUMEN:- • What are the different...
• What are the different...
TYPES OF CONSTRUCTION EQUIPMENTS:- • VARIOUS EQUIPMENTS USE...
• VARIOUS EQUIPMENTS USE...
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In this video Er. Vivek Kumar Pandey explains How to perform quality Control Measures for dense bituminous macadam.
Dense Bituminous Macadam(DBM) is a binder course used for roads and highway works with a greater number of heavy commercial vehicles and a close-graded premix material vehicle and a close-graded premix material having a voids content of 5-10 percent.
This material has increased in popularity due to durable surface which performs almost well as in all situations.Suitable for all pavement layers and for all traffic conditions.DBM provides a good quality smooth surface and improved skid resistance.Should be able to withstand the higher shear stress that occur below the bearing course.
Viscosity grade bitumen-VG10, VG20, VG30, VG40 etc.
Modified Bitumen- Polymer Modified Bitumen (PMB), Crumbled Rubber Method Bitumen (CRMB) etc.
Metallic strings supported on pegs and arms to be used as level reference for paver. Interval between pegs shall be 10m.
Before commencing paving operations, paver parts to be completely checked. Like screed heater, auger, sensor etc.
Tire pressure of Pneumatic tired roller shall be maintained 0.56kg/cm².
Water Sprayer to be checked for adequate holes before spraying.
Temperature of the mix shall be checked before laying into the paver.
Once the material is spread by paver, compaction to start immediately and shall be completed within the specified rolling temperature.
Rolling of longitudinal joints shall be done immediately behind the paving operations.After this, rolling shall start at the edges and progress towards the centre.Tyre pressure of PTR shall be at least 0.56 Mpa.
Three types of rolling is used to achieve the required compaction.