DCPT (Dynamic Cone Penetration Test) Dynamic cone penetration test or DCPT is a quick, simple and low cost test which is extensively used by many agencies around the globe to measure the strength of compacted material of unbound granular and sub grade layers with reasonable accuracy. Now a days DCPT is commonly used during construction … Read more
Types of Railway Yards The system of tracks laid usually on a fairly level ground for receiving, storing, sorting, making up trains and dispatch of vehicles, is known as railway yards. The railway yards are broadly classified as under Passenger yards Goods yards Marshalling yards Locomotive yards 1. Passenger Yards The main function of passenger … Read more
DCPT or Dynamic Cone Penetration Test The dynamic cone penetrometer is a portable equipment that can be used to evaluate different layer of a pavement such as unbound granular base, sub-base, sub-grade and also pipeline congested0 narrow trenches where testing with other equipment is difficult and not feasible due to cost, space and time constraints. … Read more
Types of Failures of Flexible Pavement Flexible pavement consist of different layers such as, Sub-grade Sub-base course Base course and Surface course If any one of the above mentioned layers becomes unstable or weak then it will result in failure of flexible pavement. Therefore it is very important to design and construct each layer with … Read more
Types of Quality Control One of the most important tasks of the supervision during the execution of a road contract is technical quality control, i.e. control as to whether the materials and work supplied by the Contractor meet the technical requirements in the contract specifications. There are two types of quality control, which are described … Read more
Factors Affecting Pavement Design Several factors affect pavement design, the most important being wheel load. Since pavements are designed to take moving loads, slow moving loads and static loads can be detrimental to the pavement. Temperature also influences pavement design especially the frost action which is very important in cold countries. There are many factors … Read more
Tests on Aggregate Aggregate plays an important role in pavement construction. Aggregates influence, to a great extent, the load transfer capability of pavements. Hence it is essential that they should be thoroughly tested before using for construction. Not only that aggregates should be strong and durable, they should also possess proper shape and size to … Read more
Lab Tests on Bitumen to Check Quality Various tests are conducted on bitumen to assess its consistency, gradation, viscosity, temperature susceptibility, and safety. There are a number of tests to assess the properties of bituminous materials. The following tests are usually conducted to evaluate different properties of bituminous materials. Penetration test Ductility test Softening point … Read more
Dry Mix Design or Aggregate Blending The objective of dry mix design is to determine the amount of various sizes of mineral aggregates to use to get a mix of maximum density. The dry mix design involves three important steps, viz. Selection of aggregates, Aggregates gradation, and Proportion of aggregates, 1. Selection of Aggregates The … Read more
Pavements form the basic supporting structure in highway transportation. Each layer of pavement has a multitude of functions to perform which has to be duly considered during the design process. Different types of pavements can be adopted depending upon the traffic requirements. Improper design of pavements leads to early failure of pavements affecting the riding … Read more