The effect on cementaggregate bond strength of partial cement replacement by silica fume was evaluated for a number of aggregate types. The partial replacement of cement by silica fume increases the strength of mortar and concrete. Silica fume concrete silica fume is an artificial pozzolona having high pozzolonic activity. When silica fume is added to portland cement concrete, it increases its compressive strength, tensile strength and abrasion resistance. They concluded that the optimum percentage of replacement with micro silica is at 10% for compressive strength and same for spilt tensile strength. Influence of micro silica and ggbs on compressive strength of ternary blended concrete. The present investigation has been aimed to determine the isolated influence of silica fume on the split and flexural tensile strengths of. Durability study on acid attack was also studied and percentage of weight loss is compared with normal concrete. This paper presents the results of experimental work on short and longterm mechanical properties of high strength concrete containing different levels of silica fume. The results suggest that the optimum replacement of cement by silica fume in highstrength concrete 50 to 70 mpa 7500 to 10,500 psi at 28 days is 15 percent. The resistance against chloride ion penetration increased with the increase in the contents of silica fume in. Microsilica in concrete types, properties, and practical. In a study relating with the effects of silica fume on strength and durability of concrete in which silica fume was replaced with cement at ratios of 5%, 10%, 15%, and 20% by weight of cement, the maximum compressive strength reached was for 15% silica fume replacement.
The mechanism, physical characteristics, benefits, and production. As a result, the isolated effect of silica fume on the properties of concrete is yet to be exhaustively investigated. This paper presents the effects of silica fume on compressive strength, splitting tensile strength, resistance against chloride penetration and water absorption of concrete. Influence of micro silica and ggbs on compressive strength. Effects of silica fume on concrete compressive strength. The effects of silica fume sf on compressive strength of concrete have been analyzed. Silica fume sf modifies interfacial transition zone between cement paste and aggregate at the micro level. Influence of steel slagsilica fume composite mineral. This paper presents a detailed experimental study on compressive strength, split tensile strength, flexural strength at age of 7 and 28 day. Effect of silica fume on mechanical properties of high. Experiments indicate that concretes become more cohesive and less prone to segregation in the presence of silica fume, moreover, performance of water demand, setting. Anecdotal evidence has suggested that silica fume is beneficial for improving pervious concrete strength and durability.
Effect of silica fume on mechanical properties of concrete. 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. To study the role of silica fume and ground granulated blast furnace slag ggbs on concrete strength characteristics of a high strength test program has been accomplished. Influence of silica fume on the tensile strength of concrete. Influence of metakaolin on chemical resistance of concrete. The results indicate that the addition of silica fume has adverse effect on the dry shrinkage property of concrete. Different concrete mixtures were cast and tested with different levels of. The results of strength tests are summarized in figure 2. The optimum silica fume replacement percentage for obtaining maximum 28 days strength of concrete ranged from 10 to 20 % 45.
A detailed experimental study in compressive strength, split tensile strength, flexural. It is a by product from an electric arc furnace used in manufacture of silicon metal or silicon alloy. Influence of coarse aggregates and silica fume on the. Prediction of flexural strength of concretes containing. Effect of silica fume on dry shrinkage and freezing. Silica fume with fineness by residue on 45 micron sieve 0. Influence of silica fume on mechanical and physical. Some researches had investigated the effect of silica fume replacement percentage on the tensile strength of concrete, it shows improvement of tensile strength when using silica fume 7, 8. Silica fume is a by product resulting from the reduction of high purity quartz with coal or coke and wood chips in an electric arc furnace during the production of silicon metal or silicon alloys. Also the incorporation of silica fume in concrete is effective to increase the bond strength with the steel. These improvements stem from the closed packing achieved in the cement paste system that reduces the overall porosity and improves the interfacial transition zone.
Although the literature is rich in reporting on silica fume concrete, most of the research works are centered on the compressive strength, and the technical data on tensile strength is quite limited. Toutanjithe development of a cementitious composites axial tensile. It is an excellent for use as a portland cement supplement. Effect of silica fumes on the compressive strength of concrete. In hardening, concrete silica fume and other hydraulic additives react with caoh2 deriving. Silica fume, also known as microsilica ms or condensed silica fume, is a byproduct of the production of silicon metal or ferrosilicon alloys. Upon filling the voids, silica fume densifies the mix, this increases the tensile strength of concrete and hence there is a increase in flexural strength.
Pdf influence of silica fume on the tensile strength of concrete. A significant improvement in the flexural strength of concrete is observed due to high pozzolanic activity and its void filling ability of silica fume 14, 15. The effect of silica fume on the properties of concrete. Abstractthe main objective of this paper is to determine the isolated effect of silica fume on tensile, compressive and flexure strengths on high strength lightweight concrete. Based on the test results, relationships between the 28day flexural and split tensile strengths with the compressive strength of silica fume concrete have been. The resistance against chloride ion penetration increased with the.
An experimental study has been conducted to investigate the effect of silica fume on shrinkage and freezingthawing durability of concrete, a large number of tests have been carried out in this study. This energy releases carbon dioxide co 2 emission to atmosphere as a result of burning fuels to produce energy needed for cement manufacturing process. The strength values at different wcm ratios have been plotted at each silica fume replacement percentage. For siliceous aggregates glass, obsidian, and quartzite, bond strength was increased significantly by the addition of silica fume. The results show that the silica fume in the composite mineral admixture contributes significantly to the consumption of caoh 2 and enhances the connection between. The dry shrinkage strain of the concrete containing silica fume is more than. The influence of this steel slag silica fume composite mineral admixture on the hydration of a cementbased composite binder and the properties of its concrete were investigated. Properties of both fresh and hardened silica fume concrete are affected significantly compared to normal concrete. Silica fume had no noticeable effect on the splitting tensile strength of concrete.
Influence of silica fume on the workability and the. 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%. Similar behavior was observed for tensile strength and elastic modulus results. Guide to using silica fume in precastprestressed concrete products prepared by pci committee on durability ralph brown. The strength values both tensile and compressive are highly depending on the volume of csh formed during hydration, so the tests were made on specimens in the same ages. The incorporation of silica fume in concrete is useful to increase the compressive strength 710, decrease the drying shrinkage 9, 10, and the permeability 11.
A study on investigation of micro silica as partial. Pdf influence of silica fume on the tensile strength of. The cement mainly consumes approximately 1015 % of total industrial energy. Request pdf influence of silica fume on the tensile strength of concrete the present paper is directed towards developing a better. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Influence of silica fume on the tensile strength of concrete request. Silica fume concrete has a gain in flexural strength from 5 th to 20 th days. Silica fume, durability, compressive strength, split tensile strength, flexural strength.
This study was conducted for better understanding of influence of silica fume on tensile and flexural strengths of concrete. Many experiments were carried out by replacing cement with different percentages of silica fume at different constant waterbinder ratio. Influence of silica fume on the workability and hydration. The influence of silica fume on the strength of the cement.
Silica fume, cstr74, properties of concrete, effects, cementitious materials, high. Influence of silica fume on high strength lightweight concrete. High strength concrete is more sensitive to cracking before and during setting than normal concrete is. To other researchers, however, the positive result due to the admixture of silica fume stems from the increase in strength of the cement matrix 6, 7. This paper investigates the individual effects of silica fume and fly ash as a partial replacement of ordinary portland cement opc on water permeability, compressive strength, split tensile strength and flexural tensile strength of high performance concrete hpc. The compressive strengths of silica fume cement paste and mortar were evaluated at various watercementitious ratios. The tensile strength of concrete is very low as the. Silica fume is known to improve the mechanical characteristics of concrete. To determine how silica fume influences a variety of pervious concrete properties and durability the research presented herein studied the performance of paste and ultimately two types of pervious concrete.
Guide to using silica fume in precastprestressed concrete. Bhanja, b sengupta, influence of silica fume on the tensile strength of. Silica fume will produce a much less permeable and high strength concrete, but it will not produce a concrete with a. The flexural strength of silica fume concrete continuously increases and maximizes at 7. For all the concrete mixes, compressive, split tensile and flexural strengths were determined at the end of 28 days. The results showed that the tensile, compressive and flexure strengths increased with silica fume incorporation but the optimum replacement percentage is not. Influence of silica fume on mechanical and durability of. Pdf effect of silica fume on workability and compressive. Influence of silica fume on the tensile strength of concrete influence of silica fume on the tensile strength of concrete bhanja, s sengupta, b. Increase in waterbinder ratio reduced the compressive strength of concrete irrespective of the use of silica fume. This paper presents the experimental results of the use of silica fume as a cement replacement in proportion to the recycled aggregate concrete. Standard prisms100mmx100mmx500mm were considered in the investigation.
The intention with the present investigation was to provide more information about the parameters responsible for this, and which can contribute to the fundamental understanding, of the problem, and in particular of the influence of silica fume. Pdf the influence of polypropylene fiber and silica fume. The compressive strength results of concrete mixed over different waterbinder ratios as well as different replacing percentages of sf were analyzed. They observed that there occurs an increase in compressive strength as well as reduction of capillary pores. The tensile strength increases with the increase in silica fume compared with normal concrete. Influence of silica fume on the tensile strength of. Pdf effects of silica fume on the strength and durability. Study on effect of silica fume on properties of m40 grade. The contribution of silica fume to the strength of concrete is yet to be fully quantified. It could be seen that the samples made with metakaolin have higher strength values, than the references.
Hootan 19933 reported that for silica fume concrete split tensile strength increases only at 28 days. The addition of silica fume can also influence the color of both plastic. The study also demonstrates the effect of silica fume on durability. The results of the experiments showed that when the polymerbinder materials ratio increases, the compressive strength of concrete decreases. In concrete, cracks can propagate very easily in tension, and the cracking of concrete due to its tensile stress being exceeded may cause serviceability and durability problems.
Influence of cement and silica fume type on compressive strength of reactive powder concrete. The combined influence of polypropylene fibersppf and silica fume sfon concrete. The effects of silica fume on the mechanical and physical properties such as compressive. The combined influence of polypropylene fibersppf and.
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