Tag Archives | Concrete

Influence of Temperature on the Strength of Concrete | Concrete Technology

Rise in the curing temperature speeds up the chemical reactions of hydration and affects the early strength of concrete without any ill effect on the later strength. However a higher temperature during placing and setting, although increases the early strength, but affects adversely strength beyond about 7 days onwards. The explanation for this may be that a rapid initial hydration [...]

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Curing of Concrete: Object, Necessity and Methods | Concrete Technology

In this article we will discuss about:- 1. Process of Hydration for Concrete 2. Objects of Concrete Curing 3. Necessity 4. Methods 5. Period of Concrete Curing 6. Maturity of Cured Concrete. Process of Hydration for Concrete:  Concrete derives its strength by the hydration of cement particles. The process of hydration is not a momentary action, it continues for long. [...]

By |2017-12-18T06:19:55+05:30December 18, 2017|Concrete|Comments Off on Curing of Concrete: Object, Necessity and Methods | Concrete Technology

Compressive and Tensile Strength of Concrete: Relation | Concrete Technology

In this article we will discuss about the relation between compressive and tensile strength of concrete. The theoretical compressive strength of concrete is eight times larger than its tensile strength. This implies a fixed relation between the compressive and tensile strength of concrete. In fact there is a close relation but not a direct proportionality. The ratio of tensile to [...]

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Behaviour of Concrete When Compressive Stress Varies | Concrete Technology

In this article we will discuss about the behaviour of concrete when compressive stress varies. When the compressive stress alternates between zero and a certain fraction of short term static strength the behaviour of concrete is very significant. As the stress increases from zero to a certain value of about 20 MPa, the strain also increases. On decreasing the load [...]

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Factors Affecting the Shrinkage of Concrete | Concrete Technology

Shrinkage of hardened concrete is influenced by various factors in a similar manner as that of creep under drying conditions. These factors are: 1.  Aggregate Content 2. Quality of Cement Paste 3. Water Content 4. Properties of Cement 5. Chemical Composition of Cement 6. Effect of High Alumina Cement 7. Entertainment of Air 8. Effect of Admixtures 9. Effect of [...]

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Strength of Concrete: Nature, Kinds and Factors | Concrete Technology

The strength can be defined as the ability to resist force. With-regard to concrete for structural pur­poses it can be defined as the unit force required to cause rupture. Strength is a good index of most of the other properties of practical importance. In general stronger concretes are stiffer, more water tight and more resistant to weathering etc. Nature of [...]

By |2017-12-18T06:19:54+05:30December 18, 2017|Concrete|Comments Off on Strength of Concrete: Nature, Kinds and Factors | Concrete Technology

Modulus of Elasticity of Concrete | Concrete Technology

In this article we will discuss about:- 1. Definition of Modulus of Elasticity 2. Determination of Modulus of Elasticity 3. Measurement of Strains in Concrete 4. Types of Young Elastic Modulus 5. Relation with Strength 6. Factors Affecting 7. Uses. In the theory of reinforced concrete, it is assumed that concrete is elastic, isotropic and homogeneous and obeys Hooke's law. [...]

By |2017-12-18T06:19:54+05:30December 18, 2017|Concrete|Comments Off on Modulus of Elasticity of Concrete | Concrete Technology

Strength of Concrete: Tensile and Fatigue | Concrete Technology

In this article we will discuss about:- 1. Tensile Strength of Concrete 2. Flexure Strength 3. Impact Strength 4. Resistance to Abrasion of Concrete 5. Fatigue Strength. Tensile Strength of Concrete: The actual tensile strength of cement paste or similar brittle material as that of stone is very much lower than the theoreti­cal strength estimated on the basis of mole­cular [...]

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Creep of Concrete: Factors, Measurement and Magnitude | Concrete Technology

In this article we will discuss about:- 1. Definition of Creep 2. Factors Influencing the Creep of Concrete 3. Measurement 4. Magnitude 5. Effects. Definition of Creep: Creep can be defined as the increase in strain under a sustained constant stress, taking into account other time dependent deformations not associated with stress viz., shrinkage, swelling and thermal defor­mations. Thus creep [...]

By |2017-12-18T06:19:54+05:30December 18, 2017|Concrete|Comments Off on Creep of Concrete: Factors, Measurement and Magnitude | Concrete Technology

Shrinkage of Concrete: 4 Types | Concrete Technology

Shrinkage of concrete can be classified into the following categories: 1. Plastic Shrinkage 2. Drying Shrinkage 3. Autogeneous Shrinkage 4. Carbonation Shrinkage. 1. Plastic Shrinkage: Plastic shrinkage takes place, soon after the concrete is placed in the form work, while the concrete is still in plastic stage. The cement paste at this stage un-goes a volumetric contraction. The magnitude of [...]

By |2017-12-18T06:19:54+05:30December 18, 2017|Concrete|Comments Off on Shrinkage of Concrete: 4 Types | Concrete Technology
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