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Both gravel and crushed stone are generally acceptable for making quality concrete Photo 9 although gravel is usually preferred for exposed aggregate The use of recycled concrete crushed to proper size concrete aggregate has also demonstrated successful performanceJan 24 32 By the CT 382 definition the maximum aggregate size is 3/4 and the nominal maximum aggregate size is 1/2 In the November version of CT 202 nominal maximum aggregate size is defined as one sieve size larger than the first size to retain more than 10 By this definition the nominal maximum aggregate size for the material example
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Size The maximum size of a well graded coarse aggregate of a given mineralogy can have two opposing effects on the strength of normal concrete With the same cement content and consistency concrete mixtures containing larger aggregate particles require less mixing water than those containing smaller aggregateCoarse Aggregate Sieve Analysis 467 Stone Nominal Size 1 1/2 to No 4 Original Mass CONCRETEHELPERCOM Sieve Size Grams Retained Grams Retained Cumulative Retained Cumulative Passing ASTM C33 Specification
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Construction aggregate or simply aggregate is a broad category of coarse to medium grained particulate material used in construction including sand gravel crushed stone slag recycled concrete and geosynthetic aggregat Aggregates are the most mined materials in the worldAbstrsct Aggregate grading is an important element in concrete mixing and the resultant compression strength An experiment was conducted to determine the effect of aggregate size on the
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The important characteristics of aggregates for concrete are listed in Table 5 2 and most are discussed in the following section Grading Grading is the particle size distribution of an aggregate as determined by a sieve analysis ASTM C 136 or AASHTO 80 Design and Control of Concrete Mixtures EB001 Table 5 1 Rock and Mineral Constituents c Aggregates The maximum size of crushed aggregate is limited to one third of the smallest inside diameter of the hose or pipe based on simple geometry of cubical shape aggregat For uncrushed rounded aggregates the maximum size should be limited to 40 percent of the pipe or hose diameter
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constant Different volume ratios of coarse aggregate size numbers 467 57 or 67 intermediate aggregate size number 8 or 89 and fine aggregates were selected to attain multiple WG and NWG mixtur Figure 7 shows grading charts for the WG and NWG aggregates used in mixtures tested at the Heidelberg/Lehigh Research FacilityC330/C330M Specification for Lightweight Aggregates for Structural Concrete C331/C331M Specification for Lightweight Aggregates for Concrete Masonry Units C332 Specification for Lightweight Aggregates for Insulating Concrete C535 Test Method for Resistance to Degradation of Large Size Coarse Aggregate by Abrasion and Impact in the Los
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Mar 02 32 When the size of aggregate is greater than 475 mm say 5 mm it is called coarse aggregate Graded aggregates are used for better particle packing The larger the size of aggregate lesser the cement required for same strength up to certain grade A Cement paste shrinks and most aggregates don t so increasing the aggregate content reducing the paste content reduces shrinkage To produce a workable concrete a small maximum size aggregate such as pea gravel requires a higher sand content than does a larger maximum size aggregate
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Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine3 C 586 Test Method for Potential Alkali Reactivity of Car bonate Rocks for Concrete Aggregates Rock Cylinder Method 3 C 595 Specification for Blended Hydraulic Cements4 C 618 Specification for Coal Jan 24 32 By the CT 382 definition the maximum aggregate size is 3/4 and the nominal maximum aggregate size is 1/2 In the November version of CT 202 nominal maximum aggregate size is defined as one sieve size larger than the first size to retain more than 10 By this definition the nominal maximum aggregate size for the material example
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The effects of aggregate type size and content on the behavior of normal and high strength concrete and the relationships between compressive strength flexural strength and fracture energy are discussed The concrete mixtures incorporate either basalt or crushed limestone aggregate sizes of 12 mm h in or 19 mm Y in andAggregate size and shape vary too The size which can range anywhere from 3/8 inch to 2 inches or more in diameter largely determines the depth of exposure Aggregate shape affects the surface pattern and texture Rounded aggregates provide the best coverage and a smoother surface while angular aggregates add more texture and dimension
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Abstrsct Aggregate grading is an important element in concrete mixing and the resultant compression strength An experiment was conducted to determine the effect of aggregate size on the Size The maximum size of a well graded coarse aggregate of a given mineralogy can have two opposing effects on the strength of normal concrete With the same cement content and consistency concrete mixtures containing larger aggregate particles require less mixing water than those containing smaller aggregate
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Concrete Materials Product 221 SD Size 1 SD Size 1A ASTM C 33 Size 57 Description Color Tifton Pink pink light red light purple Shape Angular/Cubical Size US Sieve 190 Well graded aggregate has a gradation of particle sizes that fairly evenly spans the size from the finest to the coarsest A slice of a core of well graded aggregate concrete shows a packed field of many different particle siz Poorly graded aggregate is characterized by small variations in size
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Crushed Concrete Aggregate Crushed portland cement concrete Salvaged Aggregate Dense graded aggregate saved or manufactured from Department project sources that may consist of natural aggregate blast furnace slag crushed concrete or reclaimed asphalt pavement with particle sizes no greater than 2 inches and no visible organic or foreign In this post I shall discuss maximum aggregate size that can be used in design Large maximum sizes of aggregates produce less voids than smaller siz Hence concretes with the larger sized aggregates require less mortar per unit volume of concrete and of coarse it is the mortar which contains the most expensive ingredient cement
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Role of Fine Aggregate in Concrete Mix Fine aggregates are the structural filler that occupies most of the volume of the concrete mix formulas Depending on composition shape size and other properties of fine aggregate you can have a significant impact on the output The role of fine aggregate can be described in few points Fine aggregates Aug 11 32 For a good concrete mix aggregates need to be clean hard strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the deterioration of concrete SIZES OF AGGREGATE At the most general level aggregates come in two varieties
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