Lecture 1, According to Size: 1 Fine aggregate: d 5 mm 2 Coarse aggregate: d >5 mm Aggregates containing a whole range of particles are named as all-in or pit-run aggregat Fine Aggregate Sand and/or crushed stone < 5 mm FA content usually 35% to 45% by mass or volume of total aggregate Coarse Aggregate Gravel and crushed stone 5 mm typically ,Classification Of Aggregates Based On Size, Shape & Source, The crushing of disintegrated rocks manufactures Coarse Aggregat 2: The particle size is less than 475mm The particle size is greater than 475mm 3: Fine Aggregates are used in concrete as filler material to fill the voids that are formed between the coarse aggregateEffect of different sizes of coarse aggregate on the ,, 23 Coarse aggregate Crushed granite CA available from local sources has been used The different sizes (20mm, 16mm, 125mm and 10mm) of CA are used and their Properties are given in Table: 1 Table: 1 Properties of Coarse aggregate S No property Size of the CA( mm) 20 16 125 10 1 Passing through IS Sieve, 20 16 125 10 2METHOD OF TEST FOR THE SOUNDNESS OF AGGREGATES ,, 2 Coarse aggregate a Separate the aggregate on the sieve sizes listed in C-1 and determine the amount of each size fraction b Split or quarter a test portion meeting the mass requirements shown below for each size fraction, which makes up 5 % or more of the submitted sampleStandard Classiﬁcation for Sizes of Aggregate for Road ,, 6 Standard Sizes 61 Standard aggregate sizes shall conform to the require-ments prescribed in Table 1 for the size number speciﬁed Conformance shall be determined by means of laboratory sieves having square openings and conforming to Speciﬁcation E11 7 Basis of Classiﬁcation 71 Classiﬁcation of an aggregate is based upon the size.
1 Batching of aggregates for concretepptx | Rock (Geology ,, The nominal maximum-size sieve may retain 5% to 15% Coarse Aggregate Grading Sieve size Percent passing by mass 375 mm (1 in) 100 250 mm (1 in) 95 to 100 125 mm ( in) 25 to 60 475 mm (No 4) 0 to 10 236 mm (No 8) 0 to 5 Size No 57 25 to 475 mm [1 in to No 4] Autograder Grading Limits Combined Aggregate Grading Reduction of Voids ,Coarse Aggregates: Types, Properites & Applications, Properties of Coarse Aggregates: 1Size of Coarse Aggregates: The size of the coarse aggregate depends on the use of the concrete is to be poured For large-scale concreting operations without complex reinforcement, large aggregates of size 80 mm, 40 mm, 20 mm are used For the simple construction of residential or other buildings, 20 mm is the ,aggregatppt | Construction Aggregate | Concrete, 8 Coarse Aggregates Coarse aggregates are retained on 475mm(#4) sieve Aggregates the size of whose particle is bigger than 475 mm but smaller than 75 mm are known as coarse aggregat 9 Uses of Aggregates Filler material Dimensional Stability: shrinkage, thermal changes Strength and Stiffness Economy To make the concrete denserStandard Speciﬁcation for Concrete Aggregates1, 425 When the order is for coarse aggregate: 4251 The grading (size number) (see 101 and Table 2), or alternate grading as agreed between the purchaser and aggre-gate supplier 4252 The class designation (see 111 and Table 3), 4253 Whether the restriction on reactive materials in 112Aggregatpptx | Construction Aggregate | Rock (Geology ,, Aggregatpptx - Free download as Powerpoint Presentation (ppt / pptx), PDF File (pdf), Text File (txt) or view presentation slides online Scribd is the world's largest social reading and publishing site.
concretemixdesign, concretemixdesign-150329082925-conversion-gate01pptx - Free ebook download as Powerpoint Presentation (ppt / pptx), PDF File (pdf), Text File (txt) or view presentation slides online , the nominal maximum size of coarse aggregate, the workability and grading zone of fine aggregate is determined from fig 95 (a), 95 (b) ,Coarse Aggregate, Feb 01, 2014· Aggregate generally occupy about 70% to 80% of the volume of concrete and can therefore be expected to have an important influence on it properti 2 3 3 4 CLASSIFICATION OF AGGREGATE:a)CLASSIFICATION BASED ON SIZE: >Coarse aggregate: Aggregate which retained on the No4 (475mm) sieveVoids in coarse aggregates: An aspect overlooked in the ,, 3 The bulk volume of coarse aggregate per unit volume of concrete depends on the maximum size of the coarse aggregate and the grading of the fine aggregate, expressed as the fineness modulus The design starts with the selection of a water content for a given maximum size of coarse aggregate Cement content is then found out simplyTitle Slide, Size numbers or grading sizes for coarse aggregates apply to the amounts of aggregate in percentages that pass through an assortment of siev Grading Limits This graph shows the limits specified in ASTM C33 for fine aggregate and for one commonly used size number (grading size) of coarse aggregateAggregates for Concrete, The maximum size of coarse aggregate used in concrete has a direct bearing on the economy of concrete Usually more water and cement is required for small-size aggregates than for large sizes, due to an increase in total aggregate surface area These graphs show that, for a given water-cement ratio, the amount of cement (or water) required ,.
EFFECTS OF AGGREGATE TYPE, SIZE, AND CONTENT ON ,, increase in aggregate size results in a decrease in the compressive strength of concrete Cook (1989) showed that, for compressive strengths in excess of 69 MPa (10,000 psi), smaller sized coarse aggregate produces higher strengths for a given water-to-cement ratio In fact, it is generally agreed that, although larger coarse aggregates can be usedClassification of Aggregates Based on Size and Shape ,, Coarse Aggregate When the aggregate is sieved through 475mm sieve, the aggregate retained is called coarse aggregate Gravel, cobble and boulders come under this category The maximum size aggregate used may be dependent upon some conditionsEFFECT OF SIZE OF COARSE AGGREGATE ON PROPERTIES ,, sizes of coarse aggregate (20,125,63mm) is found and there mechanical properties like Void content, Permeability, split tensile at different curing periods is calculated The strength of pervious concrete specimen with 0% replacement and different sizes of coarse aggregate specimens are immersed in 5% of HCL & 5% of H 2 SO4 for 7, 28, 56, 9014 AGGREGATES, aggregate size - designation of aggregate in terms of lower (d) and upper (D) sieve sizes expressed as d/D fine aggregate - designation given to the smaller aggregate sizes with D less than or equal to 4 mm coarse aggregate - designation given to the larger aggregate sizes with D greater than or equal to 4 mm and d greater than or equal to 2 mm ,Practical Grading of Aggregates | Concrete Technology, Zone II represents medium sand, generally suitable for the standard 1:2 fine to coarse mix, when the maximum size of coarse aggregate is 20 mm The choice of correct proportion is particularly important as the grading of the sand approaches the fine outer limit of zone 4 or the coarse outer limit of zone I.
ch5pptx, View ch5pptx from CE 321 at University of Tennessee Materials for Civil and Construction Engineers CHAPTER 5 Aggregates USC 51 Aggregate Sources Natural: natural sand & gravel pits, riverORGANIC MATTER DISTRIBUTION IN SOIL AGGREGATE ,, They were air dried, gently crushed by hand, and carefully sieved into size fractions of 1-2, 05-1, 025-05, 0125-025, 005-0125, andPpt sieve analysis, Mar 03, 2013· Major Soil GroupsCohesive Granular soils orsoils Cohesionless soils Clay Silt Sand Gravel Cobble Boulder 0002 0075 475 Grain size (mm) Fine grain Coarse grain soils soils 4 5 Grain Size Distribution Significance of GSD: To know the relative proportions of different grain siz
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