The softening point of bitumen or tar is the temperature at which the substance attains particular degree of softening. The beaker is filed in beaker such that the surface is about 50 millimetre above the specimen. IS 73 has specified different criteria so, code should be followed before application of bitumen for specified load. After that it is again heated at a rate of 50 C per minute till the bitumen softens & touches the bottom of the metal plate placed at a specified distance below the ring. 1. Note down the temperature when the ball along with bitumen just touches the lower plate. A 6) A thermometer having a range of more than 120 degrees centigrade and accuracy not less than 0.5 centigrade. AIM: To determine the softening point of asphaltic bitumen and fluxed native asphalt, road tar, coal tar pitch and blown type bitumen as per IS: 1205 - 1978. PRINCIPLE: It is the temperature at which the substance attains a particular degree of softening under specified condition of the test. Hence, The average value of the two temperatures of both balls is the softening point of bitumen. The consistency of a penetration grade or oxidized bitumen can also be measured by determining its softening pOint1157’1581. After that put distilled water in the beaker at a temperature of 5 degree centigrade. 5 (5) Objective:-The softening point is defined as the mean of the temperatures at which the bitumen disks soften and sag downwards a distance of 25 mm under the weight of a steel ball. and 1.5 degrees centigrade for temperature ranges 60 degrees centigrade to 80 degrees centigrade. Now, place the frame in water and leave it for 15 minutes. The lower plate of metal frame doesn’t have any hole. The softening point of bitumen used in the pavement construction varies between 35° to 70°.It indicates how susceptible the bitumen with respect to the variation of temperature. PRINCIPLE: It is the temperature at which the substance attains a particular degree of softening under specified condition of the test. Lab Reports / By Dibyandu Pal / February 20, 2019 August 4, 2019 / Leave a Comment. The softening point of bitumen used in the pavement construction varies between 35° to 70°.It indicates how susceptible the bitumen with respect to the variation of temperature. Types, Advantages Disadvantages of Camber, Cause, Effect, and Types of Segregation of concrete, Steel Vs Concrete – Advantages and Disadvantages With features, How to calculate bricks in a wall pdf – With Brick Masonry Pier, Brick masonry – Types, Tools, materials required and Procedure, IS codes for civil engineering free download pdf – All Codes Used, Cinder block vs Concrete block – Application, Uses, Cost-efficient, etc, Rain Water Harvesting Methods – Importance, Disadvantages, Design of circular water tank – Resting on the Ground, Under the Ground, AAC blocks vs Red bricks – Composition, Application, Preparation, Plane Table Surveying- Principle, Types, Two-point Problem, What is PCC DPC and RCC in civil engineering | RCC and PCC, Size of steel bars used for Construction – Civil Concept, Minimum clear cover for slab, column, beam, Retaining Structure, Step by Step- RCC roof Slab steel calculation- Numerical Example, Uses of rain gauge | Rain gauge types | Tipping bucket rain gauge, Relation between Discharge velocity and Seepage velocity in soil mass, 2020 – Soil mechanics by bc punmia pdf free download [.PDF], Rate analysis for Concrete- Step by Step calculation with table. The principle behind this test is that softening point is the temperature at which the substance attains a particular degree of softening under specified condition of the test. The diameter of the top ring is 17.5 millimeter and its height is 6.4 millimeters. Softening Point denotes the temperature at which the Bitumen attains a particular degree of Softening under the specified condition of test. Bitumen of the same penetration value with a higher softening point is less susceptible to temperature than of that same grade bitumen saving less softening point. The Diagram shows Softening Point Test Process below. the consistency of all the grades will be same at the softening point e.g. Take individual data of temperature for both ball individually. The bitumen will not be suited if it is melting at natural atmosphere temperature and leads to vehicle skid. Softening point of bitumen = (A + B)/2 = (46 + 47)/2 = 46.5 degree centigrade. The distance between top surface of bottom plate and lower surface of middle plate is 25 millimeter. 4) The steel ball has diameter 7.5 millimetre and its weight is 3.5 gram. In this, we are going to test the softening point of bitumen. After 15 minutes take steel ball which are previously cooled at the tempreture at 5 degree centigrade and placed on the top of the ball guide. 3) The centering guide has three pins such that they form an imaginary circle if diameter slightly larger than 7.5 millimeters to enable movement of steel ball.

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