Fineness of cement is tested in two ways : (a) By sieving. Specific Gravity & Grindabilitiy 86 3. Fax: +86-371-6389 8989, If you have any need, please contact us by e-mail  gaom@superior-abrasives.com, Copyright © 2017 Henan Superior Abrasives I/E Co., Ltd. . Tag: specific surface of cement. Traditionally, cement fineness has been assessed by the specific surface area (SSA) through the Blaine method (BM). So the bottom of the pond has an SSA of 200. First calculate the square footage of the bottom of the pond. Like sand, gravel, anvils, ... Their specific density is 2,857 kg/m 3, and specific surface area 310 m 2 /kg. Blaine’s air permeability apparatus consists essentially of a means of drawing a definite quantity of air through a prepared bed of cement of definite porosity. The surface area formula for a rectangular box is 2 x (height x width + width x length + height x length), as seen in the figure below:. Do not forget to convert to proper units. The BET theory has also been used to calculate SSA, however, also some assumptions may lead to inaccuracy in the calculations. Typical Data for Liquid Fuels 95 9. Soundness of Cement. Specific surface area (SSA) is a property of solids defined as the total surface area of a material per unit of mass,[1] (with units of m2/kg or m2/g) or solid or bulk volume[2][3] (units of m2/m3 or m−1). While in air permeability method or sedimentation method, the fineness of cement is expressed in terms of the specific surface area of cement. (b) By determination of specific surface (total surface area of all the particles in one gram of cement) by air-permeability apparatus. Conversion in other common units: Volume in Cubic Yards (yd3) = Volume in Cubic Feet (ft3) / 27 Volume in Cubic Meters (m3) = Volume in Cubic Feet (ft3) x 0.0283. [4] For this reason, in addition to the most commonly used Brunauer-Emmett-Teller (N2-BET) adsorption method, several techniques have been developed to measure the specific surface area of particulate materials at ambient temperatures and at controllable scales, including methylene blue (MB) staining, ethylene glycol monoethyl ether (EGME) adsorption,[5] electrokinetic analysis of complex-ion adsorption[4] and a Protein Retention (PR) method. This engineering-related article is a stub. However, the results can differ markedly depending on the substance adsorbed. Indeed, in this initial hydration period, the specific surface area remains rather constant and is not dependent on heat rate as shown in Fig. The specific surface and nonevaporable-water content of a hydrated cement are also somewhat dependent on the initial drying treatment. To put this in perspective, the specific surface area of (unhydrated) portland cement powder is less than 1 m2/g, while the surface area of a fine silica fume with an average particle size of 100 nm has a surface area of around 20 m2/g [5]. of water / lbs. 02. Since a rectangular box or tank has opposite sides which are equal, we calculate each unique side's area, then add them up together, and finally multiply by two to find the total surface area. Since the Blaine measurement is related to a specific surface area (area per mass of cement) and is referred to as a fineness measure, total specific surface area is often referred to as a fineness measure. Bags The specific surface area of the cement is related to the fineness of the cement. This formula can also be used to measure deficiencies and inconsistencies. Specific surface is expressed… Follow Blog via Email. Development of improved comparative and absolute methods for determination of specific surface area of porous powders (cementitous materials) using gas (air) permeability technique. Fig. Implications of Surface Area Cations Exchange Capacity (CEC) Water retention and movement Heavy metal and pesticide adsorption Nutrients and Irrigation management . The specific surface area of cement is generally around 350. 4 • It’s a calculation: w/c ~ lbs. For the present case the specific surface area of standard cement is given as 3400 cm2/gm & the time ‘T’ is measured as 49 seconds The value of constant ‘K’ can be determined by using a standard cement of known specific surface area and measuring the value of ‘T’ for a standard weight of cement which is normally taken as 2.8 gms. Soundness is the … The result is the total area not requiring blocks. Tel: +86-371-5663 6667 of cement w/c m ~ lbs. 1. fineness indicates the fineness degree of powdery raw materials. [6] A number of international standards exist for the measurement of specific surface area, including ISO standard 9277.[7]. As particle size gets smaller, specific surface area for that media type increases, that is to say, the surface area to volume ratio increases, i.e. Thus, the unit of fineness of cement is m²/Kg. Specific surface area (SSA) is a property of solids defined as the total surface area of a material per unit of mass, (with units of m /kg or m /g) or solid or bulk volume (units of m /m or m ). This has the advantage of measuring the surface of fine structures and deep texture on the particles. soil or snow). Total surface of a finely divided solid per unit of mass, http://www.owlnet.rice.edu/~ceng402/Hirasaki/CHAP3D.pdf, http://www.rsc.org/suppdata/lc/b8/b812301b/b812301b.pdf, "Scalable Surface Area Characterization by Electrokinetic Analysis of Complex Anion Adsorption", "Determination of surface area of fine-grained soils by the ethylene glycol monoethyl ether (EGME) method", "A Protein-Retention Method for Specific Surface Area Determination in Swelling Clays", "ISO 9277:2010(en) Determination of the specific surface area of solids by gas adsorption — BET method", "Specific Surface Area Determination for Microporous/Mesoporous Materials: The Case of Mesoporous FAU-Y Zeolites", https://en.wikipedia.org/w/index.php?title=Specific_surface_area&oldid=1003255928, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 28 January 2021, at 03:29. Slabs, Square Footings, or Walls. In adsorption based methods, the size of the adsorbate molecule (the probe molecule), the exposed crystallographic planes at the surface and measurement temperature all affect the obtained specific surface area. If it is too thin, early hydration will be more sufficient, early strength will be high, water demand will be large, and the probability of concrete cracking will be large. First divide the amount retained on each sieve by the number of particles per pound. Area of the Circle (ft2) = Pi x (Diameter/2)^2 Volume in Cubic Feet (ft3) = Depth x Area . Formula using measurements in feet. The smaller the size of the particles, the larger their specific surface area. Introduction :MeasUl'ements of water vapor [1, 2, 3a, 3b, 4] 2 and Thermal Conductivities of Various 89 Substances 6. • Coarser Surface Texture • Particle Shape • Particle Size Distribution • As the air content increas es, the strength of the concrete decreases. For the particular weight of cement, higher the fineness of cement, higher the specific surface area of the cement. It has a particular importance for adsorption, heterogeneous catalysis, and reactions on surfaces. It is a physical value that can be used to determine the type and properties of a material (e.g. PRINCIPLE: The fineness of cement is measured as specific surface. Proposal of quadratic equation for prediction of flow rates versus pressure in packed beds of cement. If the cube has a mass of 7 ounces (approx 200g), the specific surface area is 13.7 square inches per ounce (approx 3.3 square centimeters per gram). Pi = 3.14. by All Rights Reserved, Various industries application of micro silica fume in thermal insulation material, High-strength non-shrink grouting material formula, Concrete indexs for Various Types of Construction Works, ASTM C 1240 92% densified and Undensified silica fume shipped to Dubai, Japanese JIS A 6207 Micro Silica Fume Specification. Convert the thickness into feet so that you'll get the volume product in cubic feet. Next, multiply the surface area by the thickness of the slab. Conversely, the early strength will be low and the water demand is small. You can help Wikipedia by expanding it. The SSA can be measured by adsorption using the BET isotherm. Length (l) Width (w) Thickness or Height (h) Quantity : Hole, Column, or Round Footings. Molecular Weight of Chemicals 88 (g/g mol) 5. The surface area of the cement particles of unit mass is called the specific surface area of the cement. The SSA can be simply calculated from a particle size distribution, making some assumption about the particle shape. Values obtained for specific surface area depend on the method of measurement. Here is an example of a rectangular shaped, bare liner Koi pond that is 20 feet long by 10 feet wide by 5 feet deep. • As the surface area of the aggregate increases the more water will be needed to maintain a given slump. The specific surface area of the cement is related to the fineness of the cement. Enter your email address to … The BET theory has inherent limitations but has the advantage to be simple and to yield adequate relative answers when the solids are chemically similar. The surface area of the cement particles of unit mass is called the specific surface area of the cement. However, the BM has the simplification of considering ideal spherical shape particles. The effect of measuring water-vapor surface and nonevaporable water with specimens dried for different periods of time is also considered. 20' x 10' = 200 square feet. surface area of the C-S-H gel is quite variable, with a conservative value being 200 m2/g. Specific surface is expressed as the total surface area in square meter of all the cement particles in one Kg of cement. Circular Slab. The fineness is expressed as a total surface area in square centimeters per gram. Total Part of the Concrete = 1+1.5+3 = 5.5 Parts Therefore, Cement Quantity = (Cement Part / Concrete Parts) * Concrete Volume = (1/5.5)* Concrete Volume = (1/5.5)*2 = 0.3636 m3 Density of Cement = 1440 kg/ m3 = 0.3636 X 1440 = 523 kg = 10.5 Approx. The specific surface area calculated using the specific surface area of all ingredients was 22.4 m 2 /g, which was obtained as the basis of 1073 m 2 /g of specific surface area, 2.0 mass% of fractional content for activated carbon, and 0.9 m 2 /g, 98.0 mass% for the others. Typical Data for Solid Fuels 90 (% as recd/mineral-matter-free) 8. The method is simple and quick, and yields a result that often correlates well with the chemical reactivity of a powder. FINENESS TEST OF CEMENT BY BLAINE’S AIR PERMEABILITY METHOD (IS-4031-PART-2) 6 Apr 2018 29 May 2018. In relatively rare cases, if deemed necessary, more complicated models based on thermodynamic approaches, or even quantum chemistry, may be applied to improve the consistency of the results, but at the cost of much more complex calculations requiring advanced knowledge and a good understanding from the operator.[8]. Bulk Density of Materials for Silo 87 Storage 4. Concrete powder is a solid block that comes in the 16 regular dye colors. Simply calculate the square footage of each of the surfaces in a pond. The Concrete Calculator estimates the volume and weight of concrete necessary to cover a given area. To know more, read Fineness Test of Cement. of water / lbs. 1: Specific Surface versus Compressive Strength of Cement. This depends upon a relationship between the specific surface area and the resistance to gas-flow of a porous bed of powder. Fig. It is represented by square centimeters per gram (cm2/g) or square meter per kilogram (m2/kg). Physical Data of Exhaust Gas with 95 Various Levels of (dry) Excess Air 10. 1. This method, however, fails to account for surface associated with the surface texture of the particles. Specific surface area of hydrating cement also plays a role, but it cannot account alone for the effect of different polymer structures and dosages on the yield stress of a given cement. Because the fineness of the microsilicon powder is less than 80%, the average particle size is from 0.1 to 0.3um, and the specific surface area is 20 – 28m2/g.

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