Soil Nailing Soil nailing is a ground improvement technique which is used to reinforce soil to make it more stable. Soil nailing is used for slopes, excavations, retaining walls etc. to make it more stable. The faces of steep slopes are usually protected by shotcrete and mesh for temporary works and by either cast-in-place concrete … Read more
Shotcrete in Concrete Repair Shotcrete is defined as “mortar or concrete pneumatically projected at high speed onto a surface” (American Concrete Institute, 1990). There are two basic types of shotcrete—dry mix and wet mix. In dry mix shotcrete, the dry cement, sand, and coarse aggregate, if used, are premixed with only sufficient water to reduce dusting. This mixture is … 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
Introduction to Structural Concepts and Design •Concrete design in Australia follows AS 3600; •Concrete behaviour varies depending on whether it is in tension or compression; •The strength of concrete is given in terms of the characteristic strength; •Characteristic strength is defined in AS 3600 as “the value of material strength, as assessed by standard test, … Read more
Concrete Mix Design Concrete is a construction material composed of : Cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement. Aggregate (generally a coarse aggregate such as gravel, limestone, or granite, plus a fine aggregate such as sand). Water and Chemical admixtures. The word concrete comes from … Read more
Concrete in Brief Properties of concrete Easily mixed, handled, transported, placed in position and compacted Segregation Separation of constituent materials of concrete Creates larger voids and reduces the durability and strength. Bleeding Water from concrete comes out of the surface Produces pores in concrete and reduces strength. Strength Compressive strength, tensile strength, flexural strength. Elasticity … Read more