High performance concrete hpc is now a days used widely in the construction industry worldwide. Because of its chemical and physical properties, it is a very reactive pozzolan. Particularly, when only silica fume or silica fume together with ground pumice was added to the concrete mixtures, it increased both the compressive strength and modulus of elasticity. Silica fume is one of the materials that can be utilized to produce highly durable and economical concrete composites. Additionally, silica fume reduces bleeding by physically blocking the pores in the fresh concrete. To produce hpc with normal ingredients one use mineral admixtures like silica fume, fly ash and metakoline. The variable parameters in the study where the silica fume content sf as a partial replacement by weight of cement, steel fiber volume fraction and superplasticizer type. Figure 4 graphically represents the effect of silica fume on split tensile strength. It was found by compressive strength test, that high. A study of mortars prepared with fly ash and silica fume for use in structures exposed to marine enviroments y. Performance of silica fume on strength and durability of concrete. Influence of silica fume on the tensile strength of concrete. In this study, 120 concrete specimens were constructed using a mix design based on aci in the laboratory with an overview of records and advantages of using microsilica in concrete. A method to reduce the cement content in concrete mixes is the use of silica fume which is an amorphous noncrystalline polymorph of silicon dioxide, silica.
Apr 10, 2015 in the present study strength properties such as compressive strength, split tensile strength and flexural strength of m40 and m50 grades of concrete with the use of micro silica 5%, 7. Effect of silica fume on concrete properties and advantages. The tensile strength of concrete is low and vary between 3. A study on strength properties of high performance concrete. Guide to using silica fume in precastprestressed concrete. The optimum silica fume replacement level and strength improvement of high strength concrete have been determined. In contrast, buck and burkes have reported high pozzolanic. Use of silica fume does not signi cantly change the unit weight of concrete. By carrying loads more efficiently than normal strength concrete, high strength concrete also reduces the total amount of material placed and lower the overall cost of the structure.
Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. Study of concrete containing silica fume and activated. Improved pore structures at transition zone for silica fume concrete resembles that it may be led to as high performance 8concrete. They used the concrete mix design of m20 grade with different proportions of 0%, 5%, 10% 15% and 20% conducting compressive strength and split tensile tests at 7 days and 28 days. Comparative study of the characteristics of nano silica.
Effect of silica fume on mechanical properties and. Contradictory data have been obtained with respect to the percentage in a portland cement paste with 10 percent silica fume liberated ch was consumed by the silica fume. By carrying loads more efficiently than normalstrength concrete, highstrength concrete also reduces the total amount of material placed and lower the overall cost of the structure. The main objective of this paper has been made to investigate the different. The physical properties of concrete with additions of silica fume and activated natural amorphous silica were investigated. Effect of silica fumes on the compressive strength of concrete. Effect of silica fume and ground pumice on compressive.
Pdf effect of silica fume on strength parameters of. Research manager introduction latexmodified lmc and silica fume sf concrete overlays were placed on six bridges on i95 south of emporia, virginia, in the fall of 1994. The effect of these variables on the properties of rpc were carefully studied. Amudhavalli and jeena mathew 2012 studied the effect of silica fume on the strength and durability parameters of concrete 3.
Microsilica silica fume can also be considered as one of the most widely used additives admixtures in this section. To improve the compressive strength of concrete by using silica fume. Experimental investigation on strength and durability of concrete. Figure 6 shrinkage of silica fume high strength concrete. In this study we used concrete mixes with silica fume of 0%, 5%, 10% and 15% by the volume of concrete for m35 garde concrete.
Burnett csr days drying time microstrain 0 10203040 50607080 90 0 200 400 600 800 90 mpa 80 mpa 60 mpa figure 7 teamwork for silica fume high strength. These results demonstrated that hydration heat and strength development of mass concrete are affected by silica fume content and higher replacement of this pozzolan material may adversely affect service life of structures. Once again, this cohesiveness is due to its fine particle content. A study of mortars prepared with fly ash and silica fume for. The strength parameters of concrete made with partial replacement of cement by silica fume using super plasticizer is investigated. There is a growing awareness of the advantages of silica fume concrete reinforcement techiniques of. Zakaria found the effect of different influencing parameters on concrete follows. Much research has been carried out to this point regarding the effects of silica fume on concrete, and it has been made clear that silica fume additions are effective in improving strength characteristics, resistance to. The equations proposed by cepfip mc 90 11, aci 363 12, norwegian , ahmad and shah 14, iravani 15 and rashid et al. Ch consumed by silica fume has been used as an index of the pozzolanic activity of silica fume. Mechanisms by which silica fume improve concrete strength silica fume increases the compressive strength and durability of concrete grutzeck et. In this study, over data were used to characterize the compressive and tensile strengths behavior. Review study towards effect of silica fume on the fresh and. Silica fume concrete is normally designed for high durability or strength characteristics and the bs 8500 recommended limiting values for cement content and wc, are generally satisfied, even without taking the silica fume into account.
Study on strength characteristics of silica fume and fly ash. A study of the combined influence of condensed silica fume and a water reducing admixture on water demand and strength of concrete j. In this study an attempt has been made to produce silica fume based geopolymer concrete and to find out its strength characteristics by considering the parameters such as ratio of alkaline liquid to silica fume, ratio of silicate to hydroxide and for different ages of geopolymer concrete with constant percentage of silica fume. From the study it is concluded that the concrete containing. Abstract concrete behaviour is affected by the packing degree of the concrete components, making it necessary. Silica fume consists of spherical particles with mean size of about 100 nm which is about 100 times finer than portland cement. Pdf study of partial replacement of cement by silica fume. Apr 11, 2014 the objective of the project is to study the on strength properties of concrete by using silica fume.
The objective of the project is to study the on strength properties of concrete by using silica fume. Cement replacement up to 10% with silica fume leads to increase in compressive. Tests were performed on some 40 mixes made using silica fume as a replacement for cement in quantities of 15, 20, and 30 percent. The incorporation of silica fume into the normal concrete is a routine one in the present days to produce the tailor made high strength and high performance concrete. Experimental evaluation of the effect of silica fume on. Effect of silica fume on strength and durability parameters of concrete. The main parameter investigated in this study is m35 grade concrete with. High performance concrete, silica fume, pond ash, compressive strength, split tensile strength. Addition of silica fume on concrete slightly increases in the tensile strength of the concrete, because it enhances the mechanical properties of concrete. If the silica fume concrete contains superplasticizers, both the shear resistance and the cohesiveness of the concrete will be reduced, and improved flow will result.
In this study percentage of silica fume was varied from 0%, 5%, 7. Pdf effect of silica fume on strength parameters of concrete as a. The creep of concrete is influenced by a large number of parameters and the effect of fly ash on creep. From all these waste material the most successful cementitious material is silica fume because it improves the. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete.
The main parameter investigated in this study is m20 grade concrete with partial replacement of cement by silica fume. This study is focused on the utilization of silica fume as partial replacement of cement for the design of high strength concrete m30. Pdf effect of silica fume on high performance concrete. For 20% silica fume foamed concrete, the resulting compressive strength was lower than the control mix. Study on strength properties of concrete by using silica fume. Silica fume is a concrete modifier used to enhance its strength up to some extent this study was conducted for better understanding of influence of silica fume on tensile and flexural strengths of concrete. Method of proportioning silica fume concrete international. The optimum percentage of silica fume to give maximum compressive strength was found to be 10%. Addition of silica fume to concrete has many advantages like high strength, durability and reduction in cement production.
Silica fume high strength concrete scancem materials. Silica fume concrete with an hrwr is more cohesive and sticky than conventional concrete. Evaluation of mechanical properties of concrete using silica. Introduction high strength silica fume concrete is a concrete that meets special combinations of strength and uniformity requirements which cannot always be achieved routinely using conventional constituents and normal mixing and placing and curing practices. A designed experimental study has been conducted to investigate the effect of silica fume on mechanical properties and carbonation resistance of concrete, a large number of experiments have been carried out in this study. Evaluation of latexmodified and silica fume concrete overlays placed on six bridges in virginia michael m. Study on strength characteristics of silica fume and fly ash as partial replacement of cement nadeem pasha1 mohammed muqueem ahmed2 mohammed azeemuddin3 shaikh minhajuddin4 waseem ali5 1professor 1,2,3,4,5department of civil engineering 1,2,3,4,5khaja bandanawaz college of engineering, gulbarga 585104 affiliated to visvesvaraya. The results indicate that the addition of silica fume has improved the compression strength and elastic modulus of concrete. In the present study, the achievability of using 5 wt% and 10 wt% of ns to reduce cement consumption in mix proportions of cement mortars while improving their mechanical strength was investigated. Study on properties of high strength silica fume concrete. Request pdf effect of silica fume on strength and durability parameters of concrete. To study the various properties of fly ash and silica fume used as mineral admixture for partial cement replacement. They concluded that optimum strength obtained at 10% of micro silica. The word concrete means the first point that comes in our mind is use of concrete in construction1,7.
This paper study the effect of silica fume to the properties of high performance ground granulated blastfurnace slag concrete to reveal the potential outmost. Compressive strength of silica fume based geopolymer concrete. The best result for compressive strength was from the 15% silica fume. Concrete containing silica fume shows substantial reduced bleeding.
To study the bulk density and cubes weight at various replacement levels of vermiculite. The optimum silica fume replacement percentage for obtaining maximum 28 days strength of concrete ranged from 10 to 20 % 45. High performance concrete, fly ash, silica fume, compressive strength, water absorption 1 department of civil engg. The influence of silica fume on the compressive strength of. In the present study a series of 5 batches of concrete were cast containing fumed. Influence of silica fume on normal concrete semantic scholar. This paper presents a detailed experimental study on compressive strength, split tensile strength, flexural strength at age of 7 and 28 day. The main parameter investigated in this study is m35 grade concrete with partial replacement of cement by silica fume by 0, 5, 10,15and by 20%. Lot more study has been carried out to assess the properties of fresh. Because of favorable reports on silica fume concrete, a study of its properties was. Environmental attack can severely reduce the strength and life of the concrete. Provided silica fume high strength concrete is cured for 24hrs shrinkage is likely to be similar or less than normal concrete. The design parameters are increasing with the incorporation of silica fume in conventional concrete and the mix proportioning is becoming complex. For example, if loaded at an early age, fly ash concrete may exhibit higher amount of creep than portland cement concrete because of lower compressive strength.
Five different watercementitious ratios were used including, 0. The waste materials which can be used as additional cementitious material like fly ash, silica fume, blast furnace, steel slag etc. Micro silica on strength and durability parameters of concrete. It typically contains 85% or more silica fidjestol and lewis 2003. However, if concrete is loaded at an early age when they have attained the. Meanwhile, at 28 days, the compressive strength of 15% silica fume was higher than the control mix, 10% silica fume and 20% silica fume.
Silica fume is most popular material used the strength of concrete by adding the. The results of this research program indicated that the following benefits might be achieved with silica fume portland cement concrete. Effect of silica fume on strength and durability parameters. Concrete is the second largest material consumed by the human being in the world next to water. This paper presents a detailed experimental study on compressive strength, split tensile strength, flexural strength at. Determining the compressive, flexural and splitting tensile. Introduction high strength silica fume concrete is a concrete that meets special combinations of strength and uniformity requirements which cannot always be achieved routinely using conventional constituents. Highstrength concrete is specified where reduced weight is important or where architectural considerations call for small support elements. Concrete containing silica fume can have very high strength and can be very. High strength concrete is specified where reduced weight is important or where architectural considerations call for small support elements. Now a days concrete constructed buildings are widely seen in and around the world. The objectives of this paper are to compare the strength parameters of silica fume replaced concrete. In the present study strength properties such as compressive strength, split tensile strength and flexural strength of m40 and m50 grades of concrete with the use of. In this paper suitability of silica fume has been 2.
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