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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
Guide to Concrete Repair Concrete repairs have occurred on Reclamation projects since the first construction concrete was placed in 1903. Unfortunately, even though the best available materials were used, many repair failures have occurred during the 90 years since that first concrete construction. In evaluating the causes of these failures, it was learned that it … Read more
Fiber-Reinforced Concrete Historical Development Fibers have been used to reinforce brittle materials from time immemorial, dating back to the Egyptian and Babylonian eras, if not earlier. Straws were used to reinforce sun-baked bricks and mud-hut walls, horse hair was used to reinforce plaster, and asbestos fibers have been used to reinforce Portland cement mortars. Research … Read more
Concrete Basics & The need for Joints What Causes Concrete To Crack? Many surface cracks in concrete slabs are not a result of structural failure of the slab but are formed by uncontrolled shrinkage of the concrete. These types of cracks can be avoided. Shrinkage cracks are the result of the concrete volume decreasing as … Read more
Concrete Basics A Guide To Concrete Practice Concrete Materials,Concrete Properties,Concrete Testing,Ordering Concrete,Proportioning and Mixing Concrete, Planning and Site Preparation,Transporting and Placing Concrete,Compacting Concrete,Finishing Concrete, Curing Concrete,Joints in Concrete,Hot and Cold Weather Concreting,Surface Finishes on Concrete, Defects in Concrete,Removing Stains from Concrete,Cracking in Concrete,Reinforced Concrete, Formwork CONCRETE is made by mixing: CEMENT WATER COARSE AND FINE … Read more
Irrigation Technology in Israel Physiography Area of 20,770 km2 Population of about 6.0 million , 90% lives in urban areas and 10% in rural areas Land is divisible into three longitudinal strips running from north to south, comprising a coastal plain, a long inland escarpment and a large desert area in the south. Main river … Read more
Admixtures in Concrete admixture in concrete Admixtures are those ingredients in concrete other than portland cement, water, and aggregates that are added to the mixture immediately before or during mixing (Fig. 6-1). Admixtures can be classified by function as follows: Admixtures in Concrete Air-entraining admixtures Water-reducing admixtures Plasticizers Accelerating admixtures Retarding admixtures Hydration-control admixtures … Read more