• Concrete Wikipedia

    OverviewEtymologyHistoryCompositionProductionAlternative typesSafetyProperties

    Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. In the past limebased cement binders were often used, such as lime putty, but sometimes with other hydraulic cements, such as a calcium aluminate cement or with Portland cement to form Portland cement concrete (for its visual resemblance to Portland stone). Many other non-cementitious types of concreteexist with other methods of binding aggregate tog

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  • Admixtures and Its Function on Concrete ,, Admixtures #1

    Apr 26, 2018· This video is the explainer video related to concrete technology subject in civil engineering. More civil engineering related videos will be uploaded in future. Kindly support our team by sharing

  • Author: Anime_Edu Civil Engineering Videos
  • Functions of Admixtures in Fresh and Hardened State of

    The admixtures are added to concrete based on their functions which they are play. Retardation or acceleration of concrete setting time, reduce segregation and water to cement ratio, improve pumpability, accelerate rate of strength development etc. are examples of function of admixtures.

  • Author: Madeh Izat Hamakareem
  • High Performance Concrete Additives

    Water ReducingAccelerating AdditivesAir-EntrainmentShrinkage ReducingCorrosion-InhibitingSuper PlasticizersPrecautions in Use of Concrete AdditivesThese are used to reduce the quantity of mixing water required to produce concrete of a certain slump, reduce water-cement ratio, reduce cement content, or increase slump. They are used extensively on larger projects where reinforcing steel requires high workability. Also used in precast and on site where the large water reduction provides very high early strength and improved durability. Water reducing additives usually reducSee more on constructionreviewonlineAuthor: Patrick Otieno
  • Superplasticizer Wikipedia

    Superplasticizers (SP's), also known as high range water reducers, are additives used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with ca. 15% less water content. Superplasticizers allow reduction in water content by 30% or more. These additives are employed at the level of a few weight percent.

  • Seven Must-Use Concrete Admixtures (Additives)

    ApplicationsBenefitsAdvantagesSet retarding concrete admixtures are used to delay the chemical reaction that takes place when the concrete starts the setting process. These types of concrete admixtures are commonly used to reduce the effect of high temperatures that could produce a faster initial setting of concrete. Set retarding admixtures are used in concrete pavement construction, allowing more time for finishing concrete pavements, reducing additional cSee more on thebalancesmb
  • What are the types and functions of concrete admixtures

    Types Of admixtures: 1. Accelerating Admixtures: This admixture is added in concrete or mortar for increasing the rate of hydration of hydraulic cement and for shortening the setting time. Calcium chloride (CaCl2) is the most widely used accelerat.

  • Types of Admixtures of Concrete & Cement Chemical, Mineral

    A material other than water, aggregates, or cement that is used as an ingredient of concrete or mortar to control setting and early hardening, workability, or to provide additional cementing properties. Admixtures of concrete are generally used to alter the properties of concrete (such as increased workability or reduced water content, acceleration or retardation of setting time, acceleration

  • Water-Reducing Admixture PlasticizersThese admixtures are used for following purposes: 1. To achieve a higher strength by decreasing the water cement ratio at the same workability as a.Mineral Admixtures of ConcreteThese have cementing properties themselves. For example: 1. Ground granulated blast furnace slag (GGBFS) A pozzolan is a material which, when combi.Ground Granulated Blast Furnace Slag (GGBFS)Ground granulated blast-furnace slag is the granular material formed when molten iron blast furnace slag (a by-product of iron and steel making) is.
  • 15 Types of Admixtures Used in Concrete The Constructor

    Author: Sadanandam Anupoju
  • Waterproofing Admixtures For Concrete, Concrete

    Aug 13, 2012· Water is essential to concrete production, placement, and curing. But once it fulfills its role in those processes, water is no longer concrete’s friend. Depending on its function and the nature of its exposure, concrete can of course perform well in wet environments. As a naturally porous material, though, and one that is prone to cracking

  • concrete Definition, Composition, Uses, & Facts Britannica

    Concrete, in construction, structural material consisting of a hard, chemically inert particulate substance, known as aggregate (usually sand and gravel), that is bonded together by cement and water. Learn more about concrete, including its history and uses.

  • Use of Water Reducers, Retarders, and Superplasticizer

    The use of superplasticizers may produce high strength concrete (compressive strength up to 22,000 psi). Superplasticizers can also be utilized in producing flowing concrete used in a heavy reinforced structure with inaccessible areas. Requirement for producing flowing concrete is

  • Corrosion Inhibitors for Reinforced Concrete: A Review

    The objective of the topic is to review the recent trends in corrosion inhibitors for reinforced concrete and their application in the laboratory and field conditions. Inhibitors are chemical substances which when added to the concrete in small concentrations will inhibit or prolong the time to initiation of corrosion in concrete structures.

  • Advantages and Disadvantages of Concrete Civil Engineering

    Concrete is resistant to wind and water. Therefore, it is very useful in storm shelters. As a soundproofing material cinder concrete could be used. Disadvantages of Concrete. Compared to other binding materials, the tensile strength of concrete is relatively low. Concrete is less ductile. The weight of compared is high compared to its strength.

  • 8 Main Cement Ingredients & Their Functions Civil

    Functions of Cement Ingredients. The main features of these cement ingredients along with their functions and usefulness or harmfulness are given below: Lime: Lime is calcium oxide or calcium hydroxide. Presence of lime in a sufficient quantity is required to form silicates and aluminates of calcium.

  • What is Precast Concrete? What Are the Advantages

    The Pier Village Parking Structure is an example of a precast concrete parking structure. Foundations: Precast concrete is used to create entire buildings — more about that below — but in cases where it isn’t utilized for the entire building, it may still be used for the foundation. Many residential homes and other buildings have precast

  • Steel Structures Vs Concrete Structures Complete

    Concrete structure can be made with many different ways. Some are given below: Plain Cement Concrete. Plain cement concrete is a hardened mass obtained from a mixture of cement, sand, gravel, and water in definite proportion. The concrete structure made by using the plain cement concrete has good compressive strength but very little tensile strength, thus limiting its use in construction.

  • Effects of Different Mineral Admixtures on the Properties

    Aug 30, 2013· This paper presents a review of the properties of fresh concrete including workability, heat of hydration, setting time, bleeding, and reactivity by using mineral admixtures fly ash ( FA ), silica fume ( SF ), ground granulated blast furnace slag ( GGBS ), metakaolin ( MK ), and rice husk ash ( RHA ). Comparison of normal and high-strength concrete in which cement has been partially

  • What is an Admixture Functions of CivilDigital

    May 11, 2013· To impart colour to concrete; To offset or reduce some chemical reaction; To reduce bleeding; To reduce the evolution of heat; Types of chemical admixture used are: Nowadays, lot of additives are used in concrete mixes to enhance its properties. Depending on the specific function or action on the concrete property, it can be classified into

  • Purpose of Rebar in Concrete Hunker

    Jul 17, 2017· Adding rebar to concrete has many benefits. Rebar is easy to set into place before pouring the concrete. It helps to reduce the cracking and breaking that is common in concrete because of its brittle properties. Rebar provides strength to concrete and saves money for the purchaser since the concrete slab, blocks or building will last longer.

  • Mixed to resist. Construction Chemicals

    Mixed to resist. Additives and active agents for the y Admixtures, additives for concrete y Industrial building materials, additives for e. g. insulating materials and fillers AirVoid Management additives and their impact on the quality of fresh and hardened concrete.

  • Polymer Additives and Their Functions

    Polymer Additives and their Functions. Most plastic additives are introduced into a compound to produce a specific result, whether to increase formability or merely change the pigmentation. In the case of copolymers, which are composed of varied and repeating molecular units, each substance included in the material plays a part in its overall

  • FUNCTIONS OF BUILDING COMPONENTS. Building

    Jan 22, 2011· >FUNCTIONS OF BUILDING COMPONENTS.To build means making use of solid materials to create a space that will fulfil a particular function. The building as a structure must fulfill the following conditions:· Satisfy the need for which it was built (function).· Must resist the loads coming to it i.e. (must be stable).·

  • Chitin: Structure, Function, and Uses Biology Wise

    The hard outer shell of arthropods and insects like beetles is primarily made up of chitin, a naturally occurring biopolymer. The following BiologyWise article elaborates more on the structure, function, and uses of chitin. Behind cellulose, chitin is the second-most abundant natural biopolymer in the world. Would you like to write for us?

  • Mixed to resist. Construction Chemicals

    Mixed to resist. Additives and active agents for the y Admixtures, additives for concrete y Industrial building materials, additives for e. g. insulating materials and fillers AirVoid Management additives and their impact on the quality of fresh and hardened concrete.

  • Polymer Additives and Their Functions

    Polymer Additives and their Functions. Most plastic additives are introduced into a compound to produce a specific result, whether to increase formability or merely change the pigmentation. In the case of copolymers, which are composed of varied and repeating molecular units, each substance included in the material plays a part in its overall

  • FUNCTIONS OF BUILDING COMPONENTS. Building

    Jan 22, 2011· >FUNCTIONS OF BUILDING COMPONENTS.To build means making use of solid materials to create a space that will fulfil a particular function. The building as a structure must fulfill the following conditions:· Satisfy the need for which it was built (function).· Must resist the loads coming to it i.e. (must be stable).·

  • Chitin: Structure, Function, and Uses Biology Wise

    The hard outer shell of arthropods and insects like beetles is primarily made up of chitin, a naturally occurring biopolymer. The following BiologyWise article elaborates more on the structure, function, and uses of chitin. Behind cellulose, chitin is the second-most abundant natural biopolymer in the world. Would you like to write for us?

  • Theory of Creep and Shrinkage in 'Concrete Structures: A

    Interest in creep and shrinkage has been rising as concrete structures more susceptible to its effects have been appearing, and structural damages or failures were being experienced. The first extensive research, which came in the 1930s, was necessitated by the introduction of long-span concrete

  • Do admixtures reduce the strength of concrete after 28 days?

    Do admixtures reduce the strength of concrete after 28 days? and their function. Hundreds of products are being marketed nowadays. Study on Construction Technology of Concrete Structure in

  • Lubricant Additives A Practical Guide

    Many lubricant additives are available, and they are selected for use based upon their ability to perform their intended function. They are also chosen for their ability to mix easily with the selected base oils, to be compatible with other additives in the formulation and to be cost effective.

  • Joints in Precast Parking Structures

    all value of the structure and the need for regular inspection and maintenance of the joints once the structure has been completed and placed in service. A conscientious inspection and maintenance program will go a long way toward ensur-ing that the owner receives the full benefit of its investment in a precast concrete parking structure.

  • Concrete Slab Definition, Functions & Design of Slab

    A flat piece of concrete, put on the walls or columns of a structure. It serves as a walking surface but may also serve as a load bearing member, as in slab homes. Its necessary to check the slab deflection for all load cases both for short and long term basis. In general, under full service load, Deflection (d) < L/250 or 40 mm whichever is smaller.

  • Additives British Nutrition Foundation

    Food additives are substances added to foods to perform a range of specific function. Additives may be natural, nature identical or artificial. Natural additives are substances found naturally in a foodstuff and are extracted from one food to be used in another. For example, beetroot juice with its bright purple colour can be used to colour

  • Admixtures for Concrete Civil Engineering

    The effectiveness of water reducers on concrete is a function of their chemical composition, concrete tempera-ture, cement composition and fineness, cement content, and the presence of other admixtures. The classifications and components of water reducers are listed in Table 6-1. See Whiting and Dziedzic (1992) for more information on

  • Uses, Benefits, and Drawbacks of Fly Ash in Construction

    Currently, more than 50 percent of the concrete placed in the U.S. contains fly ash. Dosage rates vary depending on the type of fly ash and its reactivity level. Typically, Class F fly ash is used at dosages of 15 to 25 percent by mass of cementitious material, while Class C fly ash is

  • MBS Broschuere Protecting Concrete EN RZ

    6 Protecting Concrete Solutions to Extend the Life of Your Structure Certified solutions Coatings play a vital role in the overall strategy of returning structures to their original appearance and design function. Because concrete structures are often exposed to aggressive environments, it is necessary to protect new and refurbished structures from

  • WHAT ARE THE FUNCTIONS OF FOUNDATION? CivilBlog.Org

    Jan 26, 2015· What is Foundation? Foundation is the lower portion of the building usually located below ground level, which transmits the loads of the super structure to the supporting soil. A foundation is therefore that part of the structure which is in direct contact with the ground to which loads are transmitted. Functions of Foundation 1. Reduction