Essay On Self Compacting Concrete

This is the most recent type of concrete formwork. It’s an emerging tech for RCC construction as well as architectural design work. This materials’ flexibility creates the ability to make concrete of any shape.

High compressive strengths are achieved by using a low water-to-cementations materials ratio, requiring the use of water-reducing admixtures to provide adequate workability. High strength concrete offers significant economic advantages over conventional normal strength concrete (NSC) because more slender members can be designed, resulting in reduced material and transportation costs. As structural components become more slender, deflection becomes a more crucial issue, making long-term creep and shrinkage deformations especially important in HSC structures.

Concrete is a important product that is used in the construction of building and infrastructures. A concrete has to have strength, durability and quality to make a strong and stable infrastructure. This study will tell us does ACC concrete mix is a very good product in the market. Does it pose a strong contender to its competitors in the current market and does the brand image of ACC ltd. plays any role in purchasing of its products.

Concrete is a important product that is used in the construction of building and infrastructures. A concrete has to have strength, durability and quality to make a strong and stable infrastructure. This study will tell us does ACC concrete mix is a very good product in the market. Does it pose a strong contender to its competitors in the current market and does the brand image of ACC ltd. plays any role in purchasing of its products.

On comparing to a reinforced concrete component, an element made of high strength concrete will have minor deflection, slighter camber change, lower pre-stress loss and longer life relatively. Additionally, it gives heightened shear capacity of columns and stronger beam-column joints. The other characteristics of high strength concrete are higher compressive strength, better tensile strength and improved

Reinforced conc. is available tec. for construction in Egypt and all over the world. It is used in almost all structures as: buildings, shells, bridges, tunnels, tanks and retaining walls. Conc. is made by mixing binding materials as sand and gravel held together with a paste of cement and water. Conc. has many advantages, such as high fcu, ability to cast in almost any desired shape, economical and fire resistance. Yet, there are some disadvantages, like low ft, low ductility and cracking. Regardless those disadvantages, Conc. is still one of the chosen materials in construction.

Portland cement concrete has been used in the field of construction since the early Roman empire, but until the early twentieth century transporting concrete to great heights or distances was a big challenge. With the invention of the concrete pump handling concrete using wheelbarrows or buckets became obsolete because they require less man-power and can reach those hard-to-get places with ease. There are three types of concrete pumps being used in construction today: truck mounted, trailer mounted or specialized. Each style of concrete pump has it’s advantages and can be tailor made for different construction applications. There is one drawback in using concrete pumps, standard concrete designs can not be used since it is too viscous and would require much larger pumps to reach the required heights. Therefore, admixtures must be added to the concrete design to change the chemical composition of the concrete to make it more flowable. Admixtures are also used to help slow down or speed up setting time, or reduce the amount of water required in the mix depending on the construction site requirements. With such a vast range of applications that concrete pumps can be used for, concrete construction has seen a great increase in production, efficiency, cost-reduction and even safety.

Fiber Reinforced Concrete (FRC) is concrete be made up of of binder, aggregates (fine and coarse), water with the addition of short, discrete and usually randomly distributed fibres, hence improving its properties in all directions. The purpose of fibres in concrete is to improve the energy absorption capacity, tensile strength, cracking and deformation characteristics of concrete thereby controlling the fracture process by bridging the cracked plane.

Reinforced concrete is one of the most important available materials for construction in Egypt and all over the world. It is used in almost all structures as: buildings, shells, bridges, tunnels, tanks and retaining walls. Concrete is made by mixing binding materials as sand and gravel held together with a paste of cement and water. The used of admixture is to change certain characteristic of concrete such as workability, durability and time of hardening. Some of concrete advantages are its high compressive strength, its ability to cast in almost any desired shape, its economical and fire resistance. Low tensile strength, low ductility and cracking consider one of its disadvantages. Regardless of this disadvantages, concrete still the materials of choice in construction.

Influence of Mixture Composition on Washout Resistance, Fresh Properties and Relative Strength of Self Compacting Underwater Concrete

Concrete is known as a construction material which is widely used throughout the entire world. According to the research, concrete contains Portland cement and it is an essential element to concrete (Naik and Moriconi, 2010). This essential element is capable of releasing carbon dioxide significantly. As carbon dioxide is known to be a green house gas, hence it can be said that this type of concrete is damaging the environment. In order to save the environment a new technology is made by which eco – friendly concrete can be made. Such concretes are made of the concrete wastes that are known to be eco – friendly; therefore, the concrete is also eco – friendly. This type of concrete is also known as green

For compressive strength test, cube specimens of dimensions 150 x 150 x 150 mm were cast for M60 grade of concrete. The moulds were filled with different proportions of cement,metakaolin and Fly Ash. Vibration was given to the moulds using the table vibrator. The top surface of specimen was leveled and finished. After 24 hours the specimens were demoulded and were being transferred to curing tank where in they were allowed to cure for 7,28and 56 days. After 7,28and 56 days curing, these cubes were tested on a digital compression testing machine as per I.S. 516-1959[14].

The production of self-consolidating concrete consists of limiting the coarse aggregate content to about 50 % or less of the solid volume, limiting its maximum size to 20mm and using lower water to powder ratios together with appropriate superplasticizers. (Okamura and Ouchi, 2003).

The properties of concrete are affected by the manner in which the pores of various sizes are distributed within it. The porosity of concrete along with pore size distribution determine the performance of such materials in construction applications. The performance includes the mechanical properties such as strength and durability properties including the ingress of chloride and sulphate ions. The total porosity in the system has a noticeable effect on the mechanical properties of construction materials , whereas the pore size distribution will mainly affect the durability properties. Concrete with the same total pore volume can exhibit entirely different properties, depending on pore size that is if it has a small number of large pores or large number of small pores. Concrete is a porous material and contains pore structures which are complex and inhomogeneous. The fine and

The utilisation of supplementary cementitious materials results in several improvements in the concrete composites and reduction in the overall economy and hence they are well accepted. Ground granulated blast-furnace slag (GGBFS) is a by -product obtained from the steel industry which is naturally cementitious and is commonly used as a replacement for cement material in concrete. In this paper our study is mainly confined to a brief study of GGBFS, its production, composition and applications. It further focusses on examination of changes occurring in the properties of OPC concrete such as strength development, setting time, consistency, durability, sustainability, permeability and appearance on partial replacement of cement with different percentages of GGBFS. We conclude that in recent times, GGBFS concrete has served as a major alternative to conventional concrete and has drawn the attention of the concrete industries due to its cement, energy and cost savings, environmental and socio-economic merits.