Testing of concrete and quality control: Variability of concrete strength and acceptance criteria and Non – destructive tests

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Testing of concrete and quality control

1.1 Various strength of concrete 1. Tensile strength: Tensile strength (Fct) = 0.35 (Fck)1/2 Where, Fck = Characteristics compressive strength 2. Compressive strength: 3. Shear strength: 4. Bond strength: 1.2 Compressive, tensile and bond strength tests Compressive strength tests: 1. Cube test: Compressive strength of concrete = Force at failure / Area 2. Cylinder test: … Read more

Introduction to Special Type of Concretes and Mix Design of Concrete: Probabilistic concept in mix design approach

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Introduction to Special Type of Concretes and Mix Design of Concrete

1.1 Light weight concrete Mixture made with light weight coarse aggregate such as shale, clay or silt giving low density. The density of light weight aggregate is less than 1200 kg/m3. Merits: Minimize the dead load of the building. Simple to handle which decrease the cost of transportation. Enhances workability. Thermal conductivity decreases. Stronger and … Read more

Properties of Hardened Concrete: Deformation of hardened concrete, moduli of elasticity & Fatigue, impact and cyclic loading

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Properties of Hardened Concrete

1.1 Deformation of hardened concrete moduli of elasticity  Deformation of hardened concrete: Following strains are responsible for the deformation of concrete: a. Elastic strain: Instantaneous deformation that occurs when an external stress is first applied. b. Shrinkage strain: Deformation that occurs due to the loss of moisture from concrete. c. Creep strain: Deformation that occurs … Read more

Properties of Fresh Concrete: Concreting in extreme temperature and Quality control at site

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Properties of Fresh Concrete

1.1 Hydration of cement Reaction of cement with water. When cement comes in contact with water chemical reaction occur which results in formation of new compound which is responsible for gain of strength and hardening of cement concrete. 1.2 W/C ratio Amount of water required is directly related to amount of cement used in concrete. … Read more

Introduction to Concrete Technology and Constituents of Concrete

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Introduction to concrete in structure and Constituents of concrete

1.1 Use of concrete in structure Concrete: Composite mixture of binder, aggregate, water and sometimes admixture. Commonly used building material. Merit: Ability to cast in any shape Economic Durable Fire and water resistant High strength Demerit: Low tensile strength Low toughness Low curing time Uses: Resistance to weather and fire resistant Strength increases with time … Read more

Quality of Waste Water: Constituent and Characteristics of waste water

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Quality of waste water

1.1 Constituents of waste water: Waste water is the dilute mixture of various waste from residential areas, commercial, industrial and other public place. Before treatment and disposal it is essential to know it’s composition, quality and characteristics. Contains organic, inorganic matter and living organism. Physical constituents/impurities: grit, ash, sand, dirt etc.. They affect physical characteristics … Read more

Quantity of Waste Water: Description of sanitary & storm water and concept of time of concentration and time area graph

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Quantity of Waste Water: Description of sanitary & storm water and concept of time of concentration and time area graph

1.1 Introduction to source and type of waste water: Quality of waste water or sewage must be known to design of sewer. Underestimate of waste water quantity may cause overflow on the street and unsanitary condition will be created. Overestimate of waste water quantity may cause uneconomical section and self-cleansing velocity may not be calculate. … Read more

Hydraulic Structure in Surface Gravity Irrigation System: Bligh’s, Lanes and Khosla’s seepage theory

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Hydraulic Structure in Surface Gravity Irrigation System

1.1 Head work: Head work is constructed at the head of canal to divert the river water towards canal. Types: 1. Storage head work: Headwork capable of seasonal regulation of water. Dam is constructed to use during time of deficit. 2. Diversion headwork: Headwork can regulate water daily, weekly or monthly. Consist of weir or … Read more

Canal Design: Components of surface gravity irrigation system & Classification of canal

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Canal Design

1.1 Components of surface gravity irrigation system: 1. Head work: Consist of all the works to store, divert and control river water and regulate supplies into canal. 2. Canal network: a. Main canal: Large capacity canal which supplies water to branch canals and the major distributaries. b. Branch canal: Supply water to major and minor … Read more

Planning & Conveyance and distribution systems in groundwater irrigation schemes: Conjunctive use of surface and ground water, components of tube-wells

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Planning & Conveyance and distribution systems in groundwater irrigation schemes

1.1 Exploration and development of groundwater: Exploration of groundwater: Objective is to locate aquifier capable of yielding water of suitable quality, for irrigation, drinking water, agricultural and industrail purpose. Done by geophysical drilling. Methods: 1. Surface exploration: Geological method. Remote sensing. Surface geophysical method. 2. Sub- surface exploration: Test drilling. Geophysical logging. Aquifer: Aquifer is … Read more