The following properties of materials will be briefly discussed: 1. Physical Properties of Materials 2. Mechanical Properties of Materials 3. Electrical Properties of Materials 4. Magnetic Properties of Materials 5. Chemical Properties of Materials. 1. Physical Properties: A. The Melting or Freezing Point: I. The melting or freezing point of pure metal is defined as the temperature at which the [...]
By thermal properties of material, we mean those properties or characteristics of materials which are the functions of temperature or heat. We are here concerned with the thermal behaviour of solids i.e., the response of solid material to thermal change, i.e., increase or decrease of heat or temperature. Thermal properties of engineering materials comprise the following: 1. Specific heat. 2. [...]
The factors have been found to influence the test results to a great extent are: 1. Effect of Size and Shape of Specimen 2. Effect of Conditions of Casting 3. Effect of Moisture Content of Specimen 4. Effect of Temperature of Specimen at Test 5. Effect of Bearing Conditions 6. Effect of Rate of Loading. Factor # 1. Effect of [...]
In this article we will discuss about:- 1. Introduction to Workability of Fresh Concrete 2. Factors Affecting the Workability of Fresh Concrete 3. Measuring the Workability 4. Effect 5. Segregation 6. Bleeding. Introduction to Workability of Fresh Concrete: The strength of concrete of a given proportion is affected very much by the degree of its compaction. Therefore it is desirable [...]
Usually the tests that can be adopted to determine the workability of concrete are: 1. Slump Test 2. K. Slump Test 3. Kelly Ball Test 4. Compacting Factor Test 5. Flow Test. 1. Slump Test: This test is used extensively at the site of Work all over the world. Actually this test does not measure the workability of concrete but [...]
Generally the factors that affect the strength of concrete are: 1. Age of Concrete 2. Coarse Aggregate 3. Richness of the Mix 4. Curing of Concrete 5. Temperature of Concrete. Factor # 1. Age of Concrete: The relation between the water/cement ratio and strength of concrete applies to one type of cement at one age only. Different types of cements [...]
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 [...]
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 [...]
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 [...]
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 [...]