IRC Method Of Concrete Mix Design About IRC 44-1976 Primarily implemented in the design of Concrete Rigid Pavements on Road Construction. Flexural strength is more often specified than compressive strength in the design of concrete mixes for pavement construction. Basic Differences from IS method Strength Criteria– Checking of Flexural strength have more priority than Compressive … Read more
Nominal Mixes In the past the specifications for concrete prescribed the proportions of cement, fine and coarse aggregates. These mixes of fixed cement-aggregate ratio which ensures adequate strength are termed nominal mixes. These offer simplicity and under normal circumstances, have a margin of strength above that specified. However, due to the variability of mix ingredients … Read more
Repair of Concrete Repair of Concrete Introduction This guide first discusses Reclamation’s methodology for concrete repair. It then addresses the more common causes of damage to Reclamation concrete, including suggestions of the types of repair methods and materials most likely to be successful in repair of concrete damage resulting from those causes. Finally, the guide … Read more
Concrete, Masonry Construction, and Formwork This section sets forth the requirements for concrete, masonry construction, and formwork. It specifically addresses plant and equipment, concrete conveyance systems, reinforcing steel, surface preparation, formwork and falsework, vertical shoring, tubular welded frame shoring, tube and coupler shoring, single-post shores, vertical slip forms, releasing and moving forms, precast concrete, lift-slab, … Read more
Causes, Evaluation and Repair of Cracks in Concrete Cracks in concrete have many causes. They may affect appearance only, or they may indicate significant structural distress or a lack of durability. Cracks may represent the total extent of the damage or they may point to the problems of greater magnitude. Their significance depends on the … Read more
Performance-Based Concrete Pavement Mix Design System Mix Design? It is the process of determining required and specifiable characteristics of a concrete mixture. Prescriptive approach (limits on materials). Performance approach (desirable characteristics). Mix design requirements are based on intended use, environment, etc.Mix design is the process of determining the quantities of concrete ingredients that meet the … Read more
Concrete Mix Design There are many methods of concrete mix design. But the British or American methods will not be applicable for our country, as the specific relationships constituting figures and tables are based on their materials. The IS 10262 recommends procedure for designing concrete mixes for general types of construction using the concreting materials … Read more
Unbonded Post-Tensioning System Technology in Building Construction Introduction During the last three decades, unbonded post-tensioning has progressively become the predominant construction choice for commercial concrete buildings in the United States. The utilization of unbonded tendons is now standard practice for concrete structures. Because of their excellent performance record and their economical and versatile application, the … Read more
Concrete and the Environment There is increasing concern now that the choice of construction materials must also be governed by ecological considerations. At the beginning of the 20th Century, the world population was 1.5 billion; by the end of the 20th Century it had risen to 6 billion. Considering that it took 10,000 years after … Read more