Effect of Silica Fume on High Performance Concrete Strength (original) (raw)
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Concrete is the most commonly used, as construction material, in large-scale constructions where strength, workability, and durability are main requirements. Professionals are continuously improving the performance and strength of concrete with the help of innovative chemical admixtures and supplementary cementitious materials. The main benefits of SCMs are their ability to replace certain amount of cement and still able to display cementitious property, thus reducing the cost of using Portland cement. This paper represents the experimental study on the properties of concrete by partial replacement of cement with 5, 10, 15% and 20% of silica fume by weight. Compressive strength of concrete's specimens, are compared with concrete specimens, with no silica fume, at 7, 14, 28, and 90 day's age. A constant water cement ratio of 0.35 is maintained and to compensate its workability, super-plasticizer is used. Specimens which included both 6 inches diameter cylinders and 4 inches cubes are casted and tested in accordance to ASTM standards. Test results indicated improvement, in the compressive strength properties of concrete samples by the inclusion of silica fume as a partial replacement of cement at a replacement level of 12%.
EXPERIMENTAL STUDY ON BEHAVIOR OF HIGH STRENGTH CONCRETE WITH SILICA FUME AS AN ADMIXTURE
This experiment is directed towards developing a better understanding on the isolated contribution of silica fume on the compressive strengths of high-strength concrete (HSC). Extensive experimentation was carried out over water–binder ratio as 0.26, silica fume ranges from 0 to 25%. For all the mixes, compressive, and split tensile strengths were determined at 28 days. The compressive, as well as the tensile, strengths increased with silica fume incorporation, and the results indicate that the optimum replacement percentage is not a constant one but depends on the water– cementitious material (w/cm) ratio of the mix. The main objective of the present investigation is to study the behavior of high strength reinforced concrete beams (replacement of cement with silica fume). Super plasticizer is used to achieve require workability. Keywords: High strength Concrete, Compressive strength, Split tensile strength, Silica fume.
Concrete is the most extensively used in large-scale constructions where strength, workability, and durability are main requirements. Engineers are continually pushing the limits upward to improve its performance with the help of innovative chemical admixtures and supplementary cementitious materials. Nowadays, most concrete mixtures contain supplementary cementitious material which forms part of the cementitious component. The main benefits of SCMs are their ability to replace certain amount of cement and still able to display cementitious property, thus reducing the cost of using Portland cement. This paper investigated the properties of concrete by partial replacement of cement with 5, 10, 15% and 20% of silica fume by weight. Compressive strength of concrete specimens, were compared with concrete specimens, with no silica fume, at 7, 14, 28, 56 and 90 day’s age. A constant water cement ratio of 0.35 was maintained and to compensate its workability, super-plasticizer was used. Specimens which included both 6 inches diameter cylinders and 4 inches cubes were casted and tested in accordance to ASTM standards. Test results indicated improvement, in the compressive strength properties of cube samples by the inclusion of silica fume as a partial replacement of cement at a replacement level of 10% but showed totally opposite behavior in case of cylinders.
Effect of Silica Fume on Strength Parameters of Concrete As A Partial Substitution of Cement
International Journal for Science and Advance Research In Technology ISSN : 2395-1052, 2017
The waste materials which can be used as additional cementitious material like fly ash, silica fume, blast furnace, steel slag etc. From all these waste material the most successful cementitious material is silica fume because it improves the strength of concrete to such level that recent design rules identify for the addition of silica fume for design of high strength concrete. Silica fume is also known as micro silica; it is used as an artificial pozzolanic super plasticizer. Now days the high strength and high performance concrete is extensively used in much civil engineering structure. To reduce the amount of cement in concrete supplementary material are used. Silica fume is most popular material used in the concrete to improve its flexural, split tensile strength. For this purpose silica fume is replaced by 0%, 5%, 7.5%, 12.5%, 15%, 20% & 25% by the weight of cement. Water binder ratio is taken 0.42 for M-25 grade of concrete. Various tests were conducted in the research which showed the results of the same percentage at the different of 0% 5%, 7.5%, 12.5%, 15%, 20% & 25% for the time period of 7, 14, and 28 days curing as a substitution of cement by micro silica on Split Tensile Strength, flexural strength.
Influence of silica fume on the tensile strength of concrete
The present paper is directed towards developing a better understanding on the isolated contribution of silica fume on the tensile strengths of high-performance concrete (HPC). Extensive experimentation was carried out over water -binder ratios ranging from 0.26 to 0.42 and silica fume -binder ratios from 0.0 to 0.3. For all the mixes, compressive, flexural and split tensile strengths were determined at 28 days. The compressive, as well as the tensile, strengths increased with silica fume incorporation, and the results indicate that the optimum replacement percentage is not a constant one but depends on the water -cementitious material (w/cm) ratio of the mix. Compared with split tensile strengths, flexural strengths have exhibited greater improvements. Based on the test results, relationships between the 28-day flexural and split tensile strengths with the compressive strength of silica fume concrete have been developed using statistical methods. D
IJERT-Study the Effect of Addition of Silica Fume on Properties of High Strength Concrete
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/study-the-effect-of-addition-of-silica-fume-on-properties-of-high-strength-concrete https://www.ijert.org/research/study-the-effect-of-addition-of-silica-fume-on-properties-of-high-strength-concrete-IJERTV3IS10221.pdf The use of high strength concrete in major constructions has become obligatory,whose mechanical properties are still at a research phase.In this paper the attempt has been made to study the properties of high strength concrete by adding silica fume in different percentage to the weight of cement. The properties include 7 days and 28 days compressive strength, splitting tensile strength and flexural strength of concrete. For this purpose, the experiment has been carried out on M60 grade of concrete,with maintaining the water cement ratio 0.3,using silica fume in different percentage 0%, 5%, 10%, 15% to the weight of cement.
Effect of Silica Fume on two-stage Concrete Strength
IOP Conference Series: Materials Science and Engineering, 2015
Two-stage concrete (TSC) is an innovative concrete that does not require vibration for placing and compaction. TSC is a simple concept; it is made using the same basic constituents as traditional concrete: cement, coarse aggregate, sand and water as well as mineral and chemical admixtures. As its name suggests, it is produced through a two-stage process. Firstly washed coarse aggregate is placed into the formwork in-situ. Later a specifically designed self compacting grout is introduced into the form from the lowest point under gravity pressure to fill the voids, cementing the aggregate into a monolith. The hardened concrete is dense, homogeneous and has in general improved engineering properties and durability. This paper presents the results from a research work attempt to study the effect of silica fume (SF) and superplasticizers admixtures (SP) on compressive and tensile strength of TSC using various combinations of water to cement ratio (w/c) and cement to sand ratio (c/s). Thirty six concrete mixes with different grout constituents were tested. From each mix twenty four standard cylinder samples of size (150mmx300mm) of concrete containing crushed aggregate were produced. The tested samples were made from combinations of w/c equal to: 0.45, 0.55 and 0.85, and three c/s of values: 0.5, 1 and 1.5. Silica fume was added at a dosage of 6% of weight of cement, while superplasticizer was added at a dosage of 2% of cement weight. Results indicated that both tensile and compressive strength of TSC can be statistically derived as a function of w/c and c/s with good correlation coefficients. The basic principle of traditional concrete, which says that an increase in water/cement ratio will lead to a reduction in compressive strength, was shown to hold true for TSC specimens tested. Using a combination of both silica fume and superplasticisers caused a significant increase in strength relative to control mixes.
Mix Design of High Performance Concrete Using Silica Fume and Superplasticizer
High Performance Concrete (HPC) now a days used widely in the construction industry world wide. To produce HPC with normal ingradients we use mineral admixtures like Silica fume, fly ash and metakoline and workable agents Superplasticizers are also used. The usage of mineral admixtures in the concrete not only enhances its strength properties but also durability. The compressive strength are investigating finding the optimum use of mineral admixture(Silica fume of levels 0, 5, 10,15, 20 and 25% at 7 days and 28 days of curing). The present investigation aims to give design mix for HPC by using silica fume and superplasticizers.
Effect of Silica Fume (SF) On the Strength and Permeability of High-Performance Concrete
AHMED BLASH, 2021
Over the past decades, the technology of concrete has undergone major developments. The introduction of new admixtures (such as super plasticizers and more recently shrinkage-reducing chemicals), the use of supplementary cementing materials and the elaboration of new and more complex mixture design methods have largely contributed to modifying the way concrete is produced and placed. In many respects, concrete has gone from a low-tech and common product to a more sophisticated material with superior mechanical properties and improved durability. The goals this work is to study the workability of fresh concrete. Also, the Effect of Silica Fume (SF) to Strength then test concrete mix for compressive strength and study the permeability by Initial Surface Absorption Test (ISAT). The core of this study focuses on the strength and permeability of concrete with silica fume and Strength is the most important property of concrete since the first consideration in structural design is that the structural elements must be capable of carrying the imposed loads. Strength characteristic is also important because it is related to several other important properties which are more difficult to measure directly. With regard to this matter, the amount of SF was varied from 0% (as a control mix) 5%, 10%, 15%, and 20% in terms of weight basis from cement are studied. Concrete tests are conducted on the concrete samples at the specific ages. All the strength tests are limited to the ages of 3, 7, 14 and 28 days.
ANALYSIS OF ENGINEERING PROPERTIES OF CONCRETE BY ADDING SILICA FUME
IRJET, 2022
Due to over increasing population and limited resources of land we have to look to the sky to accommodate this increasing population and for that we are so much focused on making high rise buildings and other mega structures to utilise the resources of land to its fullest, but this cannot be achieved without improving our construction technique and materials. As we know that Concrete is one of the most widely used structural material hence its property and quality influence the construction a lot. Here in my project I have tried to evaluate those properties of concrete and the improvement in those properties by adding silica fume. Silica fume act as a filler material and fills the pores between cement particles, making it more dense and improving the microstructure of concrete and thus improving the mechanical properties of concrete, such as strength, impermeability, durability, elastic modulus and so on. It also improve the concrete by chemically reacting with hydration precipitation of Ca(OH2) and producing hydrated calcium silicate in alkaline conditions thus improving the consistency of concrete and workability. Compressive strength of concrete is the most important property of concrete, because other properties like stress- strain relationship, tensile strength, bond strength, modulus of elasticity, density, impermeability, durability etc. can be inferred from the compressive strength using established correlations. Therefore in this project I have focused on observing the improvement in compressive strength of concrete by adding silica fumes and finding the most optimum proportion of silica fume which gives us the best result. Different mix design are prepared following IS code and different proportion of silica fume (i.e. 0%, 5%, 10%, 15%, 20%) are added and the results of 7 and 28 days compressive strength are found and compared. The result shows a progressive increase in compressive strength of concrete (corresponding to 28 days strength) till 15% of silica fume and then it slightly decreases hence we can correlate that the most optimum proportion of silica fume that should be added in concrete is about 15% of total cementations material. Adding silica fume also improves the early strength of concrete (i.e. 7days strength), durability etc as discussed in the project