aggregate sampling methods rifling

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02b

Aggregate sampling is the process of taking a sample of aggregate that is truly representative of the nature and condition of the aggregate in the stockpile. The size of …

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SAMPLING OF AGGREGATES AASHTO T 2

Sampling Procedure Insert the template into the aggregate on the stopped conveyor belt being sure the template passes through the aggregate and rests on the surface of the belt as close as practicable (Figure 2). Do not sample the portions of material first discharged on the belt or material discharged as the bin empties.

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Revisions of Sampling Procedures for Aggregates and …

Includes sampling procedures for: Coarse or Fine Aggregate Stockpiles Using a Front-End Loader. Coarse or Fine Aggregate Stockpiles Using a Shovel. Aggregate …

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SAMPLING PROCEDURES FOR AGGREGATES

Random or systematic sample site selection methods may be used. Costeaning must be used for all random sampling to ensure that all material in the stockpile has an equal chance of selection. Face sampling may be used for systematic sampling of stockpiles of less than approximately 1000m. 3. Stockpiles of more than approximately 1000m. 3

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HOW TO REDUCE AGGREGATE GROSS SAMPLE TO TEST SAMPLE …

Sample Reduction Using Mechanical Splitter. Use of a mechanical splitter is considered to be the best method to reduce the gross sample of aggregate. The mechanical splitter splits the sample into two halves as the material passes through the spaces between the bars in the splitter.

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Library

Aggregate Field Operating Procedures for: AASHTO R 90, Sampling Aggregate Products; AASHTO R 76, Reducing Samples of Aggregate to Testing Size; AASHTO T 255, Total Evaporable Moisture Content of Aggregate by Drying (Acrobat, 99 KB); AASHTO T 27, Sieve Analysis of Fine and Coarse Aggregates; and AASHTO T 11, Materials Finer than …

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Standard sampling technique of coarse aggregate …

Standard sampling technique of coarse aggregate (quartering) ... are casted in order to study the effect of the micro-reinforcement strengthening with different sections. Mechanical method is used

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BS 812-102 Testing Aggregates Methods For Sampling

BS 812-102 Testing Aggregates Methods for Sampling - Free download as PDF File (.pdf), Text File (.txt) or read online for free.

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Quartering

Any sampling method yields large quantities of material but for laboratory analysis only a few grams of ground material is required. The process of sample preparation ensures that the small quantity of material analyzed represents the large quantity collected during sampling. In other words, sample collected from various sample points are again ...

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- Aggregate Sample Reduction for Laboratory Testing

By following ASTM D75 for aggregate sampling and ASTM C702 for sample reduction a smaller size of aggregate test sample that is truly representative of the whole stockpile can be obtained for aggregate testing. Aggregate sample reduction to maintain the characteristics of the aggregate lot is equally as important as the tests conducted on the ...

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ASTM D75 / D75M Standard Practice for Sampling …

By the end of this course you should know how to sample coarse and fine aggregates for: Identify the steps for securing samples from a flowing aggregate stream (bins or belt discharge), conveyor belt, stockpiles, transportation units, and roadway; Identify the requirements for the number and masses of field samples

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MD1

SAMPLING METHOD MD1 DIVISION OF A SAMPLE USING THE RIFFLER 1 SCOPE This method describes the division or reduction of a sample of granular material ... aggregate (mm) (whether graded or single-sized) Opening width (mm) 25,0 or larger discussed in Chapter 7 (paragraph 1.1.1). 13,2 – 25,0 6,7 – 13,2 less than 6,7

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Library

Find the operating procedures and standards for testing aggregate products, such as sieve analysis, moisture content, fracture, and plastic fines. Download the full workbook, …

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Sample Reduction

Various methods including the Rotary Sample Divider Technique, Riffle Box Sample Reduction Technique, Fractional Shovelling Sample Reduction, and Quartering …

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Representative mass reduction in the laboratory: riffle …

The resulting chute width is just about the smallest opening that can accommodate very fine grained aggregate material and powders without a serious danger of clogging. So riffle splitters smaller than this are not relevant, and other ways must be found (other tools) that manage to do sub-sampling in a fashion that achieves the same …

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Sampling Aggregates

Sampling Fine Aggregate. Sampling fine aggregate from a stockpile involves the following steps: Evaluate the hazards associated with the specific pile before sampling. The larger the pile, the greater the risk of sliding material, both from new material and disturbed areas. Sample from various locations around the pile if segregation is low …

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Spinning Riffler Method: The Benefits

The Fritsch Rotary Cone Sample Divider is customizable to match the properties and sampling requirements of each wet or dry material. Rotating dividing heads feature built-in cones for even material distribution and are available in stable plastic or anodized aluminum with sampling ratios of 1:8, 1:10, and 1:30.

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Sieve Analysis of Coarse Aggregate: The Art of Sample …

Procedure Overview. Mechanical Splitter – This accurate and repeatable method is the most widely accepted for reducing coarse aggregate samples to test size. Splitters are commonly available for aggregates with particle sizes up to 37.5 mm (1½ in). Make sure the sample is air-dried before using a Mechanical Splitter.

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Reducing field sample of aggregate to testing …

Method 1: Mechanical splitter Tools and Apparatus: mechanical splitter with different sizes. Fig.1: Mechanical Splitter Procedure: Place the sample in the hopper or top plate of the splitter, …

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Standard Practice for Reducing Samples of Aggregate …

METHOD C—MINIATURE STOCKPILE SAMPLING (DAMP FINE AGGREGATE ONLY) 11. Apparatus 11.1 Apparatus shall consist of a straight-edged scoop, shovel, or trowel for mixing the aggregate, and either a small sampling thief, small scoop, or spoon for sampling. 12. Procedure 12.1 Place the original sample of damp ﬁne aggregate on a

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ASTM D75

Sampling location: representative sampling points are selected from the aggregate stockpile or delivery vehicle. Care is taken to avoid areas where segregation or contamination may occur. Sampling methods: ASTM D75 outlines various sampling techniques, such as increment sampling and grab sampling. These methods are …

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SAMPLING OF AGGREGATES FOP FOR AASHTO T 2 (11) …

Method B – Fine Aggregate (Alternate Tube Method): 1. Remove the outer layer that may have become segregated. 2. Using a sampling tube, obtain one increment of equal size from a minimum of five random locations on the pile. 3. Combine the increments to form …

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Chapter 3

This chapter discusses different methods and protocols for sampling, testing, and controlling the quality of aggregates used in pavement construction. It covers topics such as method specifications, material …

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METHOD OF TEST FOR SOIL AND AGGREGATE SAMPLE …

3. Sample Splitters: sample splitters (riffle splitters) must have an even number of equal-width permanently fixed chutes which discharge alternately to each side of the splitter. There must be not less than a total of 8 chutes for splitters used for coarse aggregate and 12 chutes for fine aggregate. The minimum width of the

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IS 2430 (1986): Methods for Sampling of Aggregates for …

IS : 2430 - 1986 2.9 Gross Sample - Sample as collected from a sub-lot, that is, the quantity of aggregates consisting of one Or several increments or unit samples taken from a sub-lot. 2.10 Laboratory Sample - The quantity of aggregates obtained by reducing a gross sample following a specified procedure and intended

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Methods of Reducing Size of Aggregate Sample

Methods of Reducing Size of Aggregate Sample. SCDOT Designation: SC-T-3 (8/08) 1. SCOPE. 1.1. These methods are intended to apply to aggregate samples that have …

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Standard Practice for Sampling Aggregates

1.1 This practice covers sampling of coarse and fine aggregates for the following purposes: 1.1.1 Preliminary investigation of the potential source of supply, …

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Laboratory Methods of Sample Preparation

Sample preparation method and Laboratory sampling procedures involve either: Coning and Quartering; or Riffling Method. Coning and Quartering for sample preparation techniques/method The method which is used for sampling large quantities of material say 20kg, consists of pouring or forming the material into a conical heap upon a …

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Standard Practice for Sampling Aggregates

4.3.3 Sampling from Stockpiles or Transportation Units— Avoid sampling coarse aggregate or mixed coarse and ﬁne aggregate from stockpiles or transportation units whenever possible, particularly when the sampling is done for the purpose of determining aggregate properties that may be dependent upon the grading of the sample. If …

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CMT

The first group performed the Miniature Stockpile Sampling on the fine aggregate sample. The sample originally had a weight of 16 kg that needed to be reduced to a testing size that is able to represent the composition of the whole sample. ... This method of sample size reduction possesses similar Steps with the ones given in ASTM designation C ...

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Quartering of aggregate

Quartering is the alternative method of reducing the size of a bulk aggregate sample where a sample divider (riffle box) is not available. The bulk sample should be shovelled to form a cone, and turned over to form a new cone, this being done three times. The third cone shoul d be flattened to an even layer 75 - 100 mm thick and then divided ...

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GUIDELINES FOR SAMPLING OF AGGREGATE …

9.1.1 This method applies to road or delivery sampling when it is more practical to estimate the time it will take to load, or to deliver to the work, the quantity of aggregate representing a lot. 9.1.2 For example, if it is estimated that 3,000 t of a particular material will be loaded and

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Rifling methods

The most commonly used rifling method is called 'broach rifling'. This, in a very simplified form, can be thought of as a series of 20 or 30 steel discs on a rod, with each disc being slightly larger than the one preceding it. Into each disc is cut the profile and number of grooves required with the last disc possessing the final calibre and ...

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FOP AASHTO R 90 (22)

SAMPLING AGGREGATE PRODUCTS FOP FOR AASHTO R 90 . Scope This procedure covers sampling of coarse, fine, or a combination of coarse and fine ... Method C – Alternate Tube Method (Fine Aggregate) 1. Remove the outer layer that may have become segregated. 2. Using a sampling tube, obtain one increment of equal size from a …

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aggregate sampling methods rifling

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REDUCING SAMPLES OF AGGREGATES TO TESTING SIZE …

reduced by a mechanical splitter according to Method A. As a quick determination, if the fine aggregate will retain its shape when molded with the hand, it is wetter than SSD. Samples of FA that are at SSD or wetter than SSD shall be reduced by Method B, or the entire sample may be dried to the SSD condition – using temperatures that do not ...

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