— Aggregate is a granular material such as sand gravel crushed stone crushed hydraulic cement concrete or iron blast furnace slag used with a hydraulic cementing medium to produce either concrete or mortar Those particles that are predominantly retained on the mm No 4 sieve are called coarse aggregates
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— The sand fineness module fine aggregate is an index number describing the mean size of sand particles By doing sieve analysis with normal sieves it is The accumulated percentage kept on each sieve is applied and the sum of the fine aggregate is subdivided by 100 To find the fine aggregate fineness modulus we require
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— Aggregates are inert granular substances like either sand gravel or crushed stone which are an important component in concrete alongside water and portland Aggregates must be pure hard solid particles free from ingested chemicals or adhesives of clay as well as other fine materials for a good concrete mix that could trigger
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— Also read Fineness Modulus of Aggregate What Why & How 10 Specific Surface of Aggregate The surface area per unit weight of the material is termed as specific surface This is an indirect measure of the aggregate grading Specific surface increases with the reduction in the size of aggregate particle
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— where L is the Avogadro number × 10 23 molecules per mole M is the molecular weight of gas or vapor in gram per mole and ω is the molecule cross sectional area of an adsorbate molecule expressed in m 2 per molecule If N m is obtained from water vapor isotherm and is expressed in grams of water per gram of solid ω is × 10 −20
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The effect of decreasing particle size on surface area can be illustrated with a deck of cards Stacked together the deck has only 25 square inches of surface area When separated as individual cards the deck has a surface area of nearly 1 000 square inches Figure As another example consider a room in your home
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— Surface Area The specific surface area is a dominant parameter in models for permeability and in the transport of a species that can adsorb on the mineral surfaces The specific surface area is usually expressed as square meters of surface per gram of solid Here we will factor out the grain density and express
The sand fineness module fine aggregate is an index number describing the mean size of sand particles By doing sieve analysis with normal sieves it is measured The accumulated percentage kept on each sieve is applied and the sum of the fine aggregate is subdivided by 100 To find the fine aggregate fineness modulus we require
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The volume of coarse aggregate would be Coarse Aggregate = 1674 lb/ à pcf = ft3 The volume of fine aggregate would be = ft3 When the specific gravity of the fine aggregate was changed by the within lab D2S the batch weight of fine aggregate would be cu ft à = 0
— Concrete made with fine sand is typically stronger than concrete with coarse sand Workability Coarser sands improve the workability of fresh concrete before it sets The large particles make the mix easier to place and finish Fine sands can reduce workability due to the increased surface area Medium sands offer a balance Porosity
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— 5 Medium silt 6 Coarse silt 7 Fine sand 8 Medium sand 9 Coarse sand 0 60 Sand Usually consists of quartz but may also contain fragments of feldspar mica and occasionally heavy minerals viz zircon Tourmaline and hornblende
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— The phenomenon is probably due to the combined effect from both friction angle and surface area FM of aggregate According to Table 3 a fine CA used in present study usually had a small friction angle The opposite effects of the CA surface area and friction angle might make the overall effect of CA on concrete rheology vague
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— Usually commercial sand is obtained from river beds or from sand dunes originally formed by the action of winds The usual particle size of sand grains is between mm to mm with further subdivision of coarse sand in range of 2 mm to mm medium sand in range of mm to 2 mm and fine sand in between mm to
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— In concrete fine aggregates and coarse aggregates make up about 75% of the total concrete materials It is therefore significantly important to acquire the right type and quality of aggregates at the site The aggregates from the main matrix of the concrete/mortar The aggregate particles are glued together by the cement & water paste
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