[PDF] CE Concrete Technology (CT) Books, Lecture Notes, 2marks with answers, Important Part B 16marks Questions, Question Bank &. CONCRETE. TECHNOLOGY. THEORY AND PRACTICE. M.S. SHETTY. BE, ME, FICI, FIIBE, FIE, MACCE. Technical Advisor, MC Bauchemie (Ind) Pvt. Ltd. Cement and Concrete Technology (ECIV ). Second Semester Water: mixing and curing requirements, tests (lecture notes) (one hour). ❖ Admixtures.
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Engineering Class handwritten notes, exam notes, previous year questions, PDF free download. CONCRETE TECHNOLOGY. Dept. of Civil engg, ACE, Banglore. Page 2. UNIT – 1. INTRODUCTION. Definition: Cement is defined in many ways as follows. CIV-E Concrete technology (5 cr). (2/28). Table of Contents. Lecture 1. .. ronaldweinland.info
You are on page 1of 12 Search inside document Civil Concrete Technology Lectures Notes Download Concrete in practice Concrete is a composite with properties that change with time. During service, the quality of concrete provided by initial curing can be improved by subsequent wetting as in the cases of foundations or water retaining structures. However, concrete can also deteriorate with time due to physical and chemical attacks. Structures are often removed when they become unsafe or uneconomical. Lack of durability has become a major concern in construction for the past 20 to 30 years. As a result, many government and private developers are looking into lifecycle costs rather than first cost of construction. Durability of concrete depends on many factors including its physical and chemical properties, the service environment and design life.
You are on page 1of 12 Search inside document Civil Concrete Technology Lectures Notes Download Concrete in practice Concrete is a composite with properties that change with time.
During service, the quality of concrete provided by initial curing can be improved by subsequent wetting as in the cases of foundations or water retaining structures. However, concrete can also deteriorate with time due to physical and chemical attacks. Structures are often removed when they become unsafe or uneconomical. Lack of durability has become a major concern in construction for the past 20 to 30 years.
As a result, many government and private developers are looking into lifecycle costs rather than first cost of construction. Durability of concrete depends on many factors including its physical and chemical properties, the service environment and design life.
As such, durability is not a fundamental property. One concrete that performs satisfactory in a severe environment may deteriorate prematurely in another situation where it is consider as moderate.
This is mainly due to the differences in the failure mechanism from various exposure conditions. Physical properties of concrete are often discussed in term of permeation the movement of aggressive agents into and out of concrete. Chemical properties refer to the quantity and type of hydration products, mainly calcium silicate hydrate, calcium aluminate hydrate, and calcium hydroxide of the set cement. Reactions of penetrating agents with these hydrates produce products that can be inert, highly soluble, or expansive.
It is the nature of these reaction products that control the severity of chemical attack. Physical damage to concrete can occur due to expansion or contraction under loading A Lecture on Concrete Basics Concrete has been the most common building material for many years. It is expected to remain so in the coming decades. Concreting is widely used in domestic, rural, commercial, recreational and educational construction Communities around the world rely on concrete as a safe, strong and simple building material.
Types of Concrete 1. Setting 2. Workability 3. Bleeding and Segregation a.
Bleeding b. Segregation 4. Hydration 5. Strength gravel and sand and Batching of Concrete 5.
Water 2. Mixing of Concrete tightness ingredients impermeabil 3. Placing of Concrete ity Concreting 6. Rate of 4. Compaction of Concrete Strength gain of Concrete 1. Tests on Concrete Concrete Mix Design Mix design can be defined as the process of selecting suitable ingredients of concrete and determining their relative proportions with the object of producing concrete of certain minimum strength and durability as economically as possible.
Design of concrete mix requires Planning means to determine the workability required, the type of concrete to be made, method of placing and mode of transportation, etc. Always plan every step before any concrete is delivered. Proper planning avoids Retarding mixtures 3.
Fly ash Site preparation is to clear the way for concrete to its place 4. Air entraining admixtures 5. Water reducing admixtures of installment, to identify joints of installment etc.
The following steps should be taken before any concrete is placed Cold Weather Concreting 2. Reinforced cement concrete: Since concrete is a brittle material and is strong in compression.
It is weak in tension, so steel is used inside concrete for strengthening and reinforcing the tensile strength of concrete. The steel must have appropriate deformations to provide strong bonds and interlocking of both materials. When completely surrounded by the hardened concrete mass it forms an integral part of the two materials, known as "Reinforced Concrete". Advantages and disadvantages of reinforced concrete Flexural Strength of Concrete Reinforced Concrete is a structural material, is widely used in many types of structures.
It is competitive with steel if economically designed and executed. Advantages of reinforced concrete It has relatively high compressive strength It has better resistance to fire than steel It has long service life with low maintenance cost In some types of structures, such as dams, piers and footings, it is most economical structural material It can be cast to take the shape required , making it widely used in pre-cast structural components It yields rigid members with minimum apparent deflection Yield strength of steel is about 15 times the compressive strength of structural concrete and well over times its tensile strength By using steel, cross sectional dimesions of structural members can b ereduced e.
In order to fulfill its purpose, the structure must meet its conditions of safety, serviceability, economy and functionality. Serviceability: No excessive Strength design method It is based on the ultimate strength of the structural members assuming a failure condition, whether due to the crushing of concrete or due to the yield of reinforced steel bars.
Although there is additional strength in the bar after yielding due to Strain Hardening , this additional strength in the bar is not considered in the analysis or design of the reinforced concrete members. In the strength design method, actual loads or working loads are multiplied by load factor to obtain the ultimate design loads. The load factor represents a high percentage of factor for safety required in the design. The ACI code emphasizes this method of design.
Must be able to perform the function, it is built for. Working stress design This design concept is based on elastic theory, assuming a straight line stress distribution along the depth of the concrete. The actual loads or working loads acting on the structure are estimated and members are proportioned on the basis of certain allowable stresses in concrete and steel.
The allowable stresses are fractions of the crushing strength of concrete fc' and the yield strength fy. Because of the differences in realism and reliability over the past several decades, the strength design method has displaced the older stress design method. Is our service is satisfied, Anything want to say? Cancel reply. Please enter your comment! Please enter your name here.
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