Types of Concrete Mixes

concrete mixes

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

Structural Detailing and Bar Bending Schedule

Detailing of Steel

Structural Detailing and Bar Bending Schedule Detailing Functions design and design requirements cutting and bending of the reinforcement placing and wiring in position maintaining position of reinforcement pre-assembly of cages and mats concreting measurements of quantities economy in the use of steel Requirements Of Detailing simple for fabrication and placing the crack width must be … Read more

ACI Method

Aci Method Of Mix Design Absolute Volume Method

ACI METHOD OF MIX DESIGN – Absolute volume method —   — Introduction ——In 1991,the American Concrete Institute(ACI) published guidaelines for normal, heavyweight and mass concrete mix design. —The absolute volume method of mix design as described by ACI committee 211 is presented. It has the advantages of simplicity that it: Applies equally well with … Read more

Portland Cement

Portland Cement

Portland Cement What Is Cement???? Material with adhesive and cohesive properties or any material that binds or unites  – essentially like glue Function Of Cement are to bind the sand and coarse aggregate  together to fill voids in between sand and coarse aggregate particle to form a compact mass Types of Cement 2 types of … Read more

Fibre Reinforced Concrete

Glass Fibres

Fibre Reinforced Concrete Need? PCC has low tensile strength, limited ductility and little resistance to cracking. PCC develops micro-cracks, even before loading. Addition of small, closely spaced and uniformly distributed fibres act as crack arresters. Fibre Reinforced Concrete is a composite material consisting of mixtures of cement, mortar or concrete and discontinuous, discrete, uniformly dispersed suitable … Read more

What is Ferro cement?

Ferro cement

What is Ferro cement? Definition   “Ferro cement is a type of thin wall reinforced concrete, commonly constructed of hydraulic cement mortar, reinforced with closely spaced layers of continuous and relatively small size wire mesh. The mesh may be made of metallic or other suitable materials” -ACI Committee 549, 1980 Cement mortar is reinforced with … Read more

Concrete Properties and Mix Design | Mix Proportioning

Mix Design

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

Introduction to Structural Concepts and Design

Structural Concepts and Design

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

Cement & Concrete Mix Design

Concrete Mix Design

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