Joints in Rigid Pavement Provisions of joints are necessitated due to: 1) Expansion, contraction and warping of concrete slabs resulting from temperature and moisture changes; 2) Facilitate a break in the construction at the end of day’s work or for any unexpected interruption to work progress; and 3) Construction of pavements in lanes of convenient … Read more
Failure of Flexible Pavement A typical flexible pavement consist of following 4 layers Soil subgrade Sub-base course Base course Surface or wearing course If due to any reason, any of the above mentioned layers loses its stability, it will lead to failure of the whole pavement. There are many types of failures of flexible pavement, … Read more
Definition – What is Bitumen Emulsion? Bitumen emulsion is a mixture of water & bitumen. Hey wait, we know that bitumen is a oil product and it cannot be mixed with water. That is why we add an emulsifier (a surface active agent) with water before adding bitumen. Addition of emulsifier with water facilitates breaking … Read more
Types of Rollers Depending upon the project requirement and soil to be compacted, different types of rollers are used for compaction work. The various types of rollers which are used for compaction are: Cylindrical Rollers Sheepsfoot Rollers Pneumatic tyred Rollers Smooth wheeled Rollers Vibratory Rollers Grid Rollers The following types of road rollers are generally … Read more
Special Materials in Concrete Industry 1. Ferrocement Ferrocement is a type of reinforced concrete composed of concrete with small aggregate (or coarse cement mortar), 12 to 30 mm thick, reinforced with a minimum of two layers of small diameter, orthogonally woven wire mesh separated by 3 to 6 mm diameter galvanized spacer wires or weld … Read more
Root Pile Construction Root piles are very small diameter piles (generally 60 mm to 135 mm). Length of the root piles generally vary within 4 m to 30 m. The concept of root pile was first introduced by an Italian engineer named F. Lizzi. His primary concern behind root pile development was to do underpinning … Read more
Construction of Low Cost Brick Walkway The primary aim for construction of a walkway is to provide easy access within a garden, awn or yard. Because in rainy season, water collected on the ground surface makes it sloppy or muddy. This causes difficulty in easy access. To avoid this we can build an inexpensive brick … Read more
Repair of Cracks in Reinforced Concrete Beams & Columns The primary cause of corrosion of steel in concrete is due to carbonation or due to chloride. Corrosion is electro-chemical process which results in formation of rust. The volume of rust formed due to steel corrosion is more than the volume of original steel. This increase … Read more
Scaffolding Scaffolding is a temporary rigid structure made of still, bamboo or timber. The primary aim of constructing a scaffold is to create a platform on which mason can work at different heights. Scaffolds also help to lift materials for the immediate uses at different heights. Common Types of Scaffolding The following 4 types of … Read more
The main objective of thermal insulation of heat insulation of a building is to conserve a constant heat or temperature inside building, irrespective of temperature changes outside. Methods of Heat Insulation or Thermal Insulation The heat in a building structure is mainly transmitted through the roofs, exposed walls and exposed wall openings, such as windows, … Read more
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