Sources of Defects in Brick Masonry There are 4 primary reasons that cause defects in brick masonry work. These are as follows. Sulphate Attack Crystallization of Salts from Bricks Corrosion of Embedded Iron or Steel Shrinkage on Drying 1. Sulphate Attack The common forms of defects due to sulphate attack are Chipping and spalling of … 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 Bonds in Brick Masonry Brick masonry is built with bricks bonded together with mortar. For temporary sheds mud mortar may be used but for all permanent buildings lime or cement mortars are used. The various types of bonds generally used in brick masonry are Stretcher bond Header bond English bond and Flemish bond … 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
Cross Sectional Elements of A Pavement The characteristics of cross-sectional elements are important in highway geometric design because they influence the safety and comfort. The 7 basic cross sectional elements of a highway pavement are Camber Width of Carriage way Kerb Road Margin Width of Formation Right of Way (ROW) 1.Camber Camber or cant is … Read more