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For how long is the needle allowed to penetrate in the penetration test?
The guidelines for the penetration test have been laid down in IS 1203. As per the same, the time allotted to the needle for penetration into the sample is 5 seconds. There are machines that automatically stop the penetration at the end of 5 seconds.
Which one of the following causes raveling in bituminous pavement?
Revelling: It is characterized by progressive disintegration of the surface due to the failure of the binder to hold the material together.
The following are the causes of raveling:
The indirect method of determining viscosity is not applicable to which of the below?
The indirect test consists of the determination of time taken by 50 mL of sample in the fluid state to flow through an orifice in a cup. This is carried out under standard test conditions and specified temperatures. Modified bitumen consists of additives and cannot be subjected to this test.
Bitumen is obtained from
Softening test was performed on a bitumen sample and it was found out to be 62°. Which grade does it belong to?
In IS 73:2013, the softening point of various grades of bitumen are noted down. There are four grades of bitumen and corresponding softening points are mentioned in the code. For VG 10, it is 40; for VG 20 – 45; for VG 30 – 47 and for VG 40 – 50.
Name the test conducted on bitumen using the Pensky-Martens closed cup apparatus?
Various tests conducted on bitumen for testing its various properties are as follows:
Marshal test is used for designing the bituminous concrete for pavement construction, Beckenham Beam Method is used to determine the deflection of the pavement slab.
_____ mould is used for conducting the ductility test.
Briquette mould is metallic and can be split into two halves. Bitumen is filled in the mould after it is fixed properly. Block mould is made of silicone and can be used for casting items. Urethane mould and latex mould can be used for casting concrete or plastic.
Which IS code is referred to for conducting the float test for bitumen?
IS 1210-1978 is used to refer to procedure and specifications for conducting float test. IS 1209 is used for flash and fire point test, IS 1211 for determination of water content and IS 1212 for determination of loss on heating.
Ductility of bitumen is measured in terms of ______
Ductility of bitumen is measured by the distance by which the bitumen gets elongated before breaking. It is expressed in cm. the sample in the mould is allowed to stretch gradually and the distance is read using the scale in the apparatus.
Which of the below tar type – application pairs matched correctly?
Tar can be of five types based on its viscosity. They are RT-1, RT-2, RT-3, RT-4 and RT-5. RT-1 has the least viscosity and is used for surface painting in extremely cold weather, RT-2 is used for standard surface painting in Indian climate, RT-3 is used for renewal coats, RT-4 is used for premixing tar macadam in the base course and RT-5 is used for grouting.