The influence of silica fume on the compressive strength of cement. Silica fume, cstr74, properties of concrete, effects, cementitious materials, high. Influence of metakaolin on chemical resistance of concrete. 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. High strength concrete is more sensitive to cracking before and during setting than normal concrete is. 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 partial replacement of cement by silica fume increases the strength of mortar and concrete. Influence of silica fume on the tensile strength of concrete.
Influence of silica fume incorporation on the fresh. The strength values at different wcm ratios have been plotted at each silica fume replacement percentage. Effect of silica fume on dry shrinkage and freezing. Silica fume will produce a much less permeable and high strength concrete, but it will not produce a concrete with a. Pdf effect of silica fume on workability and compressive.
The addition of silica fume can also influence the color of both plastic. A study on investigation of micro silica as partial. In hardening, concrete silica fume and other hydraulic additives react with caoh2 deriving. Silica fume is known to improve the mechanical characteristics of concrete. The compressive strength results of concrete mixed over different waterbinder ratios as well as different replacing percentages of sf were analyzed.
Pdf the influence of polypropylene fiber and silica fume. The effect of silica fume on the properties of 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. Influence of silica fume on the workability and hydration. The resistance against chloride ion penetration increased with the increase in the contents of silica fume in.
Bhanja, b sengupta, influence of silica fume on the tensile strength of. Properties of both fresh and hardened silica fume concrete are affected significantly compared to 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 cement mainly consumes approximately 1015 % of total industrial energy. Study on effect of silica fume on properties of m40 grade. The optimum silica fume replacement percentage for obtaining maximum 28 days strength of concrete ranged from 10 to 20 % 45.
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 the workability and the. This paper presents a detailed experimental study on compressive strength, split tensile strength, flexural strength at age of 7 and 28 day. Experiments indicate that concretes become more cohesive and less prone to segregation in the presence of silica fume, moreover, performance of water demand, setting. The study also demonstrates the effect of silica fume on durability. 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.
Influence of silica fume on high strength lightweight concrete. Influence of coarse aggregates and silica fume on the. 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. These improvements stem from the closed packing achieved in the cement paste system that reduces the overall porosity and improves the interfacial transition zone. Silica fume, durability, compressive strength, split tensile strength, flexural strength. 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.
Pdf influence of silica fume on the tensile strength of. 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. They concluded that the optimum percentage of replacement with micro silica is at 10% for compressive strength and same for spilt tensile strength. Standard prisms100mmx100mmx500mm were considered in the investigation. Hootan 19933 reported that for silica fume concrete split tensile strength increases only at 28 days. For all the concrete mixes, compressive, split tensile and flexural strengths were determined at the end of 28 days. The effects of silica fume sf on compressive strength of concrete have been analyzed. For siliceous aggregates glass, obsidian, and quartzite, bond strength was increased significantly by the addition of silica fume. The flexural strength of silica fume concrete continuously increases and maximizes at 7. Different concrete mixtures were cast and tested with different levels of. 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. As a result, the isolated effect of silica fume on the properties of concrete is yet to be exhaustively investigated. 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. This study was conducted for better understanding of influence of silica fume on tensile and flexural strengths of concrete.
Influence of steel slagsilica fume composite mineral. 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. Toutanjithe development of a cementitious composites axial tensile. They observed that there occurs an increase in compressive strength as well as reduction of capillary pores. Also the incorporation of silica fume in concrete is effective to increase the bond strength with the steel. 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. The present investigation has been aimed to determine the isolated influence of silica fume on the split and flexural tensile strengths of.
Silica fume concrete silica fume is an artificial pozzolona having high pozzolonic activity. Influence of silica fume on the tensile strength of concrete request. The dry shrinkage strain of the concrete containing silica fume is more than. The combined influence of polypropylene fibersppf and. Pdf influence of silica fume on the tensile strength of concrete. The tensile strength increases with the increase in silica fume compared with normal concrete. Influence of silica fume on mechanical and physical. Effect of silica fumes on the compressive strength of concrete. Increase in waterbinder ratio reduced the compressive strength of concrete irrespective of the use of silica fume.
This paper presents the effects of silica fume on compressive strength, splitting tensile strength, resistance against chloride penetration and water absorption of concrete. It is a by product from an electric arc furnace used in manufacture of silicon metal or silicon alloy. 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 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. The mechanism, physical characteristics, benefits, and production. Influence of silica fume on the tensile strength of concrete influence of silica fume on the tensile strength of concrete bhanja, s sengupta, b. The 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. Prediction of flexural strength of concretes containing.
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. This energy releases carbon dioxide co 2 emission to atmosphere as a result of burning fuels to produce energy needed for cement manufacturing process. Silica fume, also known as microsilica ms or condensed silica fume, is a byproduct of the production of silicon metal or ferrosilicon alloys. The results of the experiments showed that when the polymerbinder materials ratio increases, the compressive strength of concrete decreases. Effect of silica fume on mechanical properties of concrete. Silica fume had no noticeable effect on the splitting tensile strength of concrete. 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. Influence of micro silica and ggbs on compressive strength. Effect of silica fume on mechanical properties of high. The results indicate that the addition of silica fume has adverse effect on the dry shrinkage property of concrete. The effects of silica fume on the mechanical and physical properties such as compressive. 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. Durability study on acid attack was also studied and percentage of weight loss is compared with normal concrete.
It is an excellent for use as a portland cement supplement. 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%. Influence of micro silica and ggbs on compressive strength of ternary blended concrete. Workability has increased with the addition of ggbs. The effect on cementaggregate bond strength of partial cement replacement by silica fume was evaluated for a number of aggregate types.
Microsilica in concrete types, properties, and practical. Many experiments were carried out by replacing cement with different percentages of silica fume at different constant waterbinder ratio. Silica fume with fineness by residue on 45 micron sieve 0. The influence of silica fume on the strength of the cement. A detailed experimental study in compressive strength, split tensile strength, flexural. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Pdf effects of silica fume on the strength and durability.
Anecdotal evidence has suggested that silica fume is beneficial for improving pervious concrete strength and durability. The resistance against chloride ion penetration increased with the. 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. Request pdf influence of silica fume on the tensile strength of concrete the present paper is directed towards developing a better. Guide to using silica fume in precastprestressed concrete. The contribution of silica fume to the strength of concrete is yet to be fully quantified.
Similar behavior was observed for tensile strength and elastic modulus results. 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. Silica fume sf modifies interfacial transition zone between cement paste and aggregate at the micro level. Guide to using silica fume in precastprestressed concrete products prepared by pci committee on durability ralph brown. The results of strength tests are summarized in figure 2. 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. The tensile strength of concrete is very low as the. When silica fume is added to portland cement concrete, it increases its compressive strength, tensile strength and abrasion resistance. 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.
This paper presents the experimental results of the use of silica fume as a cement replacement in proportion to the recycled aggregate concrete. The compressive strengths of silica fume cement paste and mortar were evaluated at various watercementitious ratios. Influence of silica fume on the tensile strength of. Addition of silica fume to concrete has many advantages like high strength, durability and reduction in cement production. Influence of cement and silica fume type on compressive strength of reactive powder concrete. Effects of silica fume on concrete compressive strength. Influence of silica fume on mechanical and durability of. It could be seen that the samples made with metakaolin have higher strength values, than the references. Effects of silica fume and fly ash as partial replacement.
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