Microsilica and concrete durability transportation research board. Fa, limestone fines and silica fume microsilica on the properties of concrete. Abstract this research describes the importance of the effect of silica fume on concrete properties and the advantages of its use in the kurdistan region, silica fume can either be addition added separately at the concrete mixer or incorporated into a factoryproduced composite cement. Concrete mix force 10,000 microsilica can be used in either central or transit mix concrete production, and in mobile mixers. Gathering selected files and creating zip, please wait. Safety data sheet microsilica concrete patching mix mn dot. In the chemical industry there is exposure from mineral. Concrete mix proportioning using micro silica proceedings of 4 th irf international conference on 19 april 2015, cochin, india, isbn. The term concrete refers to a mixture of aggregates, usually sand. Shrinkage of latexmodified and microsilica concrete overlay. Special provision for portland cement concrete inlay or overlay check sheet 34. Micro silica concrete is a high performance, very dense, strong concrete made with naturally occurring amorphous silica.
Silicafume can be used in a variety of cementitious products such as concrete,grouts,and mortars as well as elastomer, polymer. Concrete is a composite material consisting of aggregate gravel and sand, cement, and water. Development of cracking patterns in modified cement matrix. As a pozzolanic material, microsilica provides a more uniform distribution and a greater volume of hydration products. Effect of micro silica on the strength of concrete with ordinary portland cement verma ajay 1, chandak rajeev 2 and yadav r. When the product is mixed with water, it will form an alkaline solution, which can cause skin irritation. The main purpose of applying the material in concrete is to use its reactive particles in. One of the biggest differences in using microsilica concrete occurs during finishing. Force 10,000 microsilica does not affect concrete set. An extensive documentation of the use of silica fume in concrete has been published by the american concrete institute aci, 1996.
Silica fume, also known as microsilica, it is a very fine pozzolanic material, composed of amorphous silica produced byelectric arc furnaces as a byproduct of the production of elemental silicon or ferro silicon alloys. Manual may be of interest to concrete specifiers, concrete producers, concrete. With the increase in trend towards the wider use of concrete for high rise buildings there is a growing demand of concrete with higher compressive strength. This report summarizes the performance of microsilica concrete mc overlays on seven distressed portland cement concrete bridge decks at three sites in oregon.
A normal type i portland cement astm c 150 and silica fume were used. Microsilica silica fume is a byproduct of the industrial manufacture of ferro silicon and. Type ip or sm blended cement replaces the portland cementpozzolan portion of the designed mix in class dp, g, gg, or hp concrete. Results from experiments to determine the effects of microsilica on concrete freezethaw resistance and on the permeability to chlorides and subsequent early corrosion rates of steel in the concrete are described. Pdf proper introduction of silica fume in concrete improves both the mechanical and durability characteristics of the concrete. For sustainable concrete silica fume is a very fine powder, which is extracted from exhaust fumes of silicon and ferrosilicon smelting furnaces and utilized in concrete to improve its properties. Stonemontqc includes a powerful concrete mix design and quality control software program for concrete producers. Different chapters of the manual may be of interest to concrete specifiers, concrete producers, concrete contractors, or concrete inspectors. Microsilica powder is composed of ultra fine solid spherical particles of amorphous silica each approximately 100 times smaller than a cement grain. Tb07 mechanical properties of force 10,000 d microsilica.
Use of microsilica as additive to concretestate of art. Immediately prior to placement the repair surface shall be thoroughly saturated with no standing water. Microsilica in concrete microsilica is a byproduct from silicon metal or ferrosilicon industries, where these metals are produced in submerged electric arc furnaces. Microsilica concrete is not difficult to work with, but because it is used for special applications, care should be taken to ensure that good quality concreting practices are followed. When it is used in concrete, it acts as a filler and as a cementitious material. Microsilica also combines with calcium hydroxide to form additional calcium. Aug 21, 2017 microsilica mixes showed significant reductions in chloride contents at typical reinforcement depths after 31 years in severe marine exposure the practical consequence of these factors is that elkem microsilica significantly reduces the risk of chlorideinitiated corrosion, especially in concrete exposed to severe marine environments. Microsilica is a highly reactive pozzolanic powder produced during the manufacture of ferrosilicon and silicon metal alloys. Technical data compressive strength astm c109 modified 24 hr. When using type ip or sm blended cement in class dp and hp concrete, an addition of microsilica 71111 is required. Pdf study of partial replacement of cement by silica fume. Microsilica, also called as silica fumes is produced in electric arc furnace as a.
Microsilica is a byproduct from silicon metal or ferrosilicon industries, where these metals are produced in submerged electric arc furnaces. How microsilica improves concrete concrete construction. Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material. Introduction to concrete portland cement association. Pdf on jul 1, 2016, lakhbir singh and others published study of. However, the latexmodified concrete overlays are more expensive to construct than the microsilica concrete overlays. Microsil anchor grout gains strength quickly and resists water washout, making it ideal for anchoring tendons, cables and bolts into soil or rock media. Chapter 3 describes primary uses of silica fume in concrete. This product is a singlecomponent formula which incorporates a powder latex technology, providing protection from. Aginam1 concluded that, there is a relationship between the. It consists of extremely fine, amorphous silica particles. Safety data sheet microsilica concrete patching mix mn dot 5098sp.
Effect of micro silica on the strength of concrete with ordinary portland cement verma ajay 1. Rather than working to get that version into the a c i manual of conrete. Workability in concrete defines its capacity to be placed, consolidated, and finished without harmful segregation or bleeding. Silica fume, also known as microsilica, cas number 69012642, einecs number 2737611 is an amorphous noncrystalline polymorph of silicon dioxide, silica. Qualified product list of synthetic fibers february 22, 2019 this list supersedes the march 9, 2018 list. This report emphasizes the overlays condition after four years of use. The effect of silica fume on the properties of concrete. Pdf optimum use of microsilica in high performance concrete. Concretetop supreme is a latex and microsilica modified, cementitious mortar designed for use as a concrete repair mortar at thicknesses of 38 to 2 9.
Bridge deck overlays in virginia are usually either latexmodified concrete or microsilica concrete, and both types of overlay are considered equivalent in terms of performance. About four tons of concrete are produced per person per year worldwide and about 1. Hazard identification the most immediate and likely hazards are burns from dust in the eye. Bridge deck microsilica concrete overlay gbsp revised.
With increase in trend towards the wider use of concrete for prestressed concrete and high rise buildings there is a growing demand of concrete with higher compressive strength. The water demand of concrete can increase when microsilica is added to the mix. Force 10,000 microsilica may be used in conjunction with waterreducing admixtures both normal and high range as approved by astm to assure workability of the mix. The concrete mix design cmd for qcqa superstructure concrete must produce a workable concrete mixture having properties that will not exceed the maximum andor minimum values defined in the special provision. Contact with cement, freshly mixed concrete, or mortar can cause sever burns. Abstract in present study, concrete has been partially replaced with microsilica which acts as a byproduct in electric furnace and flyash which is a byproduct in thermal power plants. In cementitious materials, the microsilica ms is mainly used to. Stonemontqc is fully integrated with the aggregate portion allowing for mix component properties to be easily kept current with data from aggregate plants. Advance construction material micro silica in concrete 2. Microsilica in concrete types, properties, and practical applications. As a filler, microsilica decreases the average size of pores in the cement paste.
It performs well in aggressive environments, for example marine environments as it provides high early strengths and durability. Microsil anchor grout is an unsanded, portland cementbased, expanding grout containing silica fume microsilica, fly ash, and other carefully selected additives. Microsilica in concrete improves its strength and durability as it provides more uniform distribution and a greater volume of hydration products, and. The results of an experimental research work on high performance concrete is presented in this paper. The addition of microsilica will virtually eliminate bleed water, making it more susceptible than conventional concrete to plastic shrinkage cracking. Safety data sheet microsilica concrete patching mix mn dot 5098sp tcc materials. Effect of micro silica on the strength of concrete with.
Investigations on microsilica silica fume as partial cement. Because of its chemical and physical properties, it is a very reactive pozzolana. The small micro silica particles fill spaces between cement particles and between the cement past matrix and aggregate particles. Micro silica effectiveness as a pozzolanic material. Tb0709 force 10,000 d microsilica and its uses in concrete. Use full bags only and do not exceed mixer capacity. Concrete mix design and quality control software management system. Microsilica modified concrete for bridge deck overlays. Practices outlined in the guide for concrete floor and slab construction aci 302 and hot. Silatec concrete microsilica enhanced concrete mix 2 a. With microsilica pastes, the modulus of concrete can be increased to ranges of 5 to 7 million psi. This gaseous fume, as it rises, cools rapidly and forms extremely minute,amorphous, spherical particles. The small microsilica particles fill spaces between cement particles and between the cement past matrix and aggregate particles.
The percentage content of recycled aggregate was between 0%100% at 25% interval. Silica fume is a very fine powder, which is extracted from exhaust fumes of silicon and ferrosilicon smelting furnaces and utilized in. Silica fluid microsilica suspension for durable concrete habe. As the molten metal is produced, a silicabased gas is emitted. Investigations on microsilica silica fume as partial. Berke results from experiments to determine the effects of microsilica on concrete freezethaw resistance and on the permeability to chlorides and subsequent early corrosion rates of steel in the concrete are described. Shrinkage of latexmodified and microsilica concrete. Mixing and application place the desired number of bags of microsilica concrete patching mix 5098sp into mixer. After 28 days, microsilica concrete is about 40 percent stronger and after 56 days, 50 percent stronger from reference 2. Microsilica in concrete contributes to strength and durability two ways. Admixture is defined as a material other than cement, water and aggregate that is used in form of ingredients of concrete and it is added in concrete before or during mixing micro silica.
Microsilica concrete patching mix mn dot 5098sp section 2. Bridge deck microsilica concrete overlay effective. Industries use of microsilica with concrete decrease the air pollution. In the alimentary industry the exposure comes from fat acids and other acids, detergents, etc. Early strength of the microsilica concrete is lower. You are not allowed to redistribute or resale the article in any format without. This work shall consist of the preparation of the existing concrete bridge deck and the construction of a microsilica concrete overlay to the specified thickness. Effect of silica fume on concrete properties and advantages.