IJERT-A Comparative Study on Flexural Strength of Concrete Containing Different Mineral Admixtures as Replacement of Cement (original) (raw)
Related papers
2014
Concrete is the most widely used material in the world today. This paper is about the comparative study of the flexural strength of concrete when different admixtures are used as partial replacement of cement in the concrete mix. The mineral admixtures that are used here are Silica Fume, Rice Husk Ash and Iron slag as partial replacement of cement. All these materials are industrial waste products and are abundantly available nowadays. These materials have high silica content and can be effectively used as a replacement of cement during the formation of High Performance Concrete. Flexural strength is the most important characteristic of concrete and is calculated for the hardened concrete to analyse the load bearing capacity for design purposes. Thus for the effective judgement of type of mineral admixtures to be used a comparative study is very useful.
Concrete is the most widely used material in the world today. This paper is about the comparative study of the flexural strength and compressive strength of concrete when different admixtures are used as partial replacement of cement in the concrete mix. The mineral admixtures that are used here are Silica Fume, Rice Husk Ash and Iron slag as partial replacement of cement. All these materials are industrial waste products and are abundantly available nowadays. These materials have high silica content and pozzolanic properties and can be effectively used as a replacement of cement during the formation of High Performance Concrete. Compressive and Flexural strength are the two most important characteristic of concrete and are calculated for the hardened concrete to analyze the load bearing capacity for design purposes. Thus for the effective judgment of type of mineral admixtures to be used a comparative study is very useful.
This paper reports a part of an ongoing experimental laboratory investigation being carried out to evaluate the mechanical properties of concrete made with mineral admixtures and local Jordanian materials. Various percentages of Silica Fume (SF) and Fly Ash (FA) were added at different water/cementitious (w/cm) ratios. Concrete specimens were tested and compared with plain concrete specimens at different ages. Results indicated that compressive as well as flexural strengths increased with mineral admixture incorporation. Optimum replacement percentage is not a constant one but depends on the w/cm ratio of the mix. SF contributed to both short and long-term properties of concrete, whereas, FA showed its beneficial effect in a relatively longer time. Adding of both SF and FA did not increase compressive strength in the short-term, but improvements were noticed in the long-term. Compared with compressive strength, flexural strength of SF concretes has exhibited greater improvements. Relationships between the 28-day flexural and compressive strengths have been developed using statistical methods. It is concluded that local concrete materials, in combination with mineral admixtures, can be utilized in making High Strength Concrete in Jordan and such concrete can be effectively used in structural applications.
Now-days, all over the world, construction activities are taking place on huge scale. Due to this there is great increase in cost of construction. Natural river sand is one of the key ingredients of concrete, is becoming expensive due to excessive cost of transportation from sources. Also large scale depletion of sources creates environmental problems. Unfortunately, production of cement also involves large amount of carbon dioxide gas into the atmosphere, a major contributor for green house effect and the global warming. To overcome these problems there is a need of cost effective, alternative and innovative materials. These materials are stone quarry dust, fly ash, silica fume, rice husk, recycled waste aggregate etc. some of them are industrial by products and are substantially available. In this paper a comprehensive effort is made to partially replace the natural river sand by stone quarry dust and cement by fly ash as an alternative in combination with mineral admixture, for c...
EFFECT OF MINERAL ADMIXTURES ON CHARACTERISTICS OF HIGH STRENGTH CONCRETE
There is great need to conserve all the natural resources. The various steps to be adopted in the direction that includes minimization of production of energy consuming materials and heavy utilization of industrial by-products. High strength concrete can be produce using such materials like fly ash, slag and silica fumes. In many countries, these materials are already used in manufacturing of concrete. Some of these material can be used as replacement for cement. Ultimately it results in the reduction of the cost manufacturing of concrete and reduces environmental pollution. To study the effect of mineral admixtures such as fly ash, slag and silica fume on mechanical properties of high strength concrete under the uniaxial compression and split tensile, experimental studies have been conducted. The cement was replaced by 5%, 10%, 15% and 20% with fly ash and slag respectively. The compressive strength and split tensile test were conducted on concrete specimen with different percentages of fly ash and slag at age of 7 days, 28 days and 56 days. This study shows that materials used in this experiment are suitable for HSC.
Experimental Study on Mechanical Properties of Concrete Using Mineral Admixtures
This paper illustrates admixtures advantages such as fly ash, silica fume and granulated blast furnace slag in concrete as it influence the properties of it. The properties such as compression, split tensile and flexural strength which are of mechanical for the specimens of different grades are obtained. The specimens are of M35 grade which includes fly ash are in proportions 5%, 10% and 15%, silica fume of 5%,10% and 15% together as the replacement of cement and granulated blast furnace slag of 5%, 10% and 15% as the small replacement of filler material which is fine aggregate. The water cement ratio by trials is kept as 0.45 for all proportions. The ground granulated blast furnace sand improves the compactness and slows the chemical activity. The use of different admixtures in concrete gives a high performance in concrete construction. The mechanical properties such as compression, split tensile strength and flexural strength are determined on 28 day. Index terms-Silica Fume, Fly Ash, GGBS, high performance concrete I.INTRODUCTION The material which is simple and complex with more advantageous and economical is concrete. Except cement other natural materials varies in quality, performance and properties. Concrete are used in different conditions were ordinary conventional concrete does not exhibit the durability and performance properties. In such cases admixtures are used to make it more suitable. These admixtures impart economy and desired characteristics. The recent trend of high performance concrete is a heterogeneous material reduces the water cement ratio thereby increasing the slump value which results in high strength. The mineral admixtures improve the strength and durability of concrete. High performance concrete provides all enhanced properties in precast members for all types of constructions. The concrete which is of high performance usually contains both filler and chemical admixtures. Therefore, hydration rate of cement and the development of strength in HPC is quite varying from that of ordinary conventional concrete. Silica fume strengthens the transition zone whereas fly ash and GGBS are used nominal benefit of others. The two main folds, first is to produce concrete using alternate materials and secondly, to reduce the emission of carbon di oxide emission in concrete. This project work study deal with mechanical properties of these materials in the concrete construction. METHODOLOGY AND MATERIALS USED To experiment the effect of fly ash, silica fume and GGBS the experimental work was done. The characteristic compression strength property of High Performance concrete is determined by the combinations given in the Table listed below. Fly ash and silica fume are done by replacement the cement in percentage of 5%, 10%, 15% each. Whereas GGBS is replaced by fine aggregate in 5%, 10% and 15%. II.FLY ASH The disposal of ashes from different materials has become thoughtful problem. Hence for the economical and conservation of cement in this project Fly ash of class type F is used which is produced by burning bituminous coal. This type of fly ash has less than 5% Calcium oxide. The fly ash shall confirm the chemical requirements in accordance to IS: 1727-1967. The composition of fly ash in chemical proportions are Tabulated below. III.SILICA FUME AS ADMIXTURE
Analysis of Concrete Containing Different Admixtures as Partial Replacement of Cement
International Journal of Engineering Research and Applications, 2017
Concrete is the most extensively used man-made construction material in the world. Its most important quality is its versatility and the ability to design the concrete of any required properties according to the environment.. Human development in today's scenario is impossible without the excessive use of concrete. Cement is the most important component of concrete. Unfortunately production of cement emits a very large amount of greenhouse gases and possess a very potential threat to the atmosphere. Thus it is inevitable for the sustainable development of human life that the dependency on cement to obtain strength in concrete should be lowered. This is the main reason to obtain a suitable replacement of cement to obtain high strength concrete at a low cost incurred. Also the modern constructions require very high strength in concrete which is only possible by mixing a suitable quantity of admixtures in the concrete. Silica fume, Rice Husk Ash and Iron Slag are abundantly available industrial waste products in India. Due to the latest imposed rules and regulations their disposal has become costly. Thus it is necessary to find a suitable useful way to utilize these waste materials. These materials have high siliceous content and pozzolanic properties thus these can be used as a replacement of cement in concrete mix and may also be used as admixture to obtain high strength. Flexural and compressive strengths are the two most important criteria that determine the performance of concrete in any field usage. Thus it is pertinent to obtain the effect of these admixtures on the flexural and compressive strength of concrete. A comparative study can analyze the relative effect of these admixtures on the strength of concrete so that the most suitable admixture can be utilized according to any existing situation.
HIGH PERFORMANCE CONCRETE MIXED WITH COMBINATION OF MINERAL ADMIXTURES
IAEME Publications, 2019
Concrete is a widely used construction material all over the world. The nonavailability or shortage of river sand will affect the construction industry. Hence there is a need to find the new alternative material to replace the present fine aggregate (Msand). However, the raw material resources used for making concrete are degrading day by day. Moreover a lot of modern-day constructions require the development of high-performance concrete (HPC). Partial replacement of cement in HPC with silica fume and again replacement of reinforced steel in HPC with asbestos fiber, steel fiber presents an environmentally friendly way of dealing with increased constructions demands. This paper deals with the study of compressive strength, tensile strength and durability of M20 grade concrete partially replacement of concrete material with combinations of different mineral admixtures. This paper is an attempt to study the behavior of silica fume (8%, 10% & 12% replacement by weight of cement). For hardened concrete the development of compressive strength of Minerals at the age of 1, 3, 7 and 28 days are investigated and compared with respect to mineral dosage variations.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/comparison-of-mechanical-properties-of-high-strength-concrete-with-different-mineral-admixtures-fine-aggregates https://www.ijert.org/research/comparison-of-mechanical-properties-of-high-strength-concrete-with-different-mineral-admixtures-fine-aggregates-IJERTV4IS090360.pdf This paper deals with the study of strength behaviour of Mineral admixtures, super plasticizer and chemicals on High strength concrete. Cement is replaced by 15 to 20% of fly ash or GGBS & Silica fume by volume of concrete, thus resulting in increase in strength, super plasticizer is added to increase the workability of concrete. Mechanical properties like compressive strength, split tensile strength and flexural strength of High strength concrete are compared by varying the Mineral admixtures in the Design mix. All the experimental work carried out for finding the aforementioned properties is in accordance with the corresponding Indian standard codes. Results reveal that the compression, split tensile, Flexural strength & Workability values of High strength concrete mixes with Flyash, GGBS & silica Fume are higher than the corresponding values of Conventional concrete. Also there is a slight increase in the above mentioned values when Fine aggregate is completely replaced by Crushed Rock Fine without changing cement content.
An Experimental Study on Structural Grade Concrete Using Multi Mineral Admixtures
Supplementary cementitious material (SCM) such as fly ash, ground granulated blast furnace slag sand silica fume are extensively used in construction. A partial replacement of cement by mineral admixtures such as, fly ash, GGBFS, silica fume (SF) in concrete mixes would help to overcome these problems and lead to improvement in the durability of concrete. In this thesis of work, an attempt has been made to study the mechanical properties of structural grade concrete using ternary blend.