Aggregate Testing
Testing of Aggregates for Concrete
Pesith Chan xxxxxxxx Xavier Cure
10440269
1. Sampling of Aggregates for Testing
1. Sampling of aggregates - General
Quality control tests are routinely carried out on representative samples of aggregates to ensure that any variation in quality is within the specification limits. The need for representative samples cannot be over-stressed; otherwise the test results may misrepresent the characteristics of the aggregates. Sampling operations must therefore be conducted by such methods which ensure that the samples obtained are, as far as, possible, representative of the supply. The basic-unit of sampling is called the sample increment.
It is a portion of materials taken directly from the conveyor, bin, truck or stockpile. Sample-increment should be taken in sets of five, each approximately equal quantity.
A bulk-sample should comprise a set of five sample-increments, mixed thoroughly to give a uniform bulk sample; the bulk-sample may often be subdivided to produce a sample of appropriate size for testing. Further division may be carried out in the laboratory to produce the test portion for the use in a particular test. A referee-sample is that portion reserved for testing in the event of a dispute about test results.
2. Sample size and sampling frequency
Testing standard for the materials specifies the sample size for test as well as the sampling method and sampling frequency. Therefore, in actual testing at the site or production plant, it is necessary to follow the recommendation from standards in order to assess the quality and property of the materials tested.
3. Sample Reduction
When the amount of material has to be reduced it is essential that the representative nature of the sample be maintained. Suitable methods for sample division are by coning and quartering or by the use of sample divider. 2. TESTING FOR LOOSE BULK DENSITY
2.1 Introduction
The loose bulk density,
Pesith Chan xxxxxxxx Xavier Cure
10440269
1. Sampling of Aggregates for Testing
1. Sampling of aggregates - General
Quality control tests are routinely carried out on representative samples of aggregates to ensure that any variation in quality is within the specification limits. The need for representative samples cannot be over-stressed; otherwise the test results may misrepresent the characteristics of the aggregates. Sampling operations must therefore be conducted by such methods which ensure that the samples obtained are, as far as, possible, representative of the supply. The basic-unit of sampling is called the sample increment.
It is a portion of materials taken directly from the conveyor, bin, truck or stockpile. Sample-increment should be taken in sets of five, each approximately equal quantity.
A bulk-sample should comprise a set of five sample-increments, mixed thoroughly to give a uniform bulk sample; the bulk-sample may often be subdivided to produce a sample of appropriate size for testing. Further division may be carried out in the laboratory to produce the test portion for the use in a particular test. A referee-sample is that portion reserved for testing in the event of a dispute about test results.
2. Sample size and sampling frequency
Testing standard for the materials specifies the sample size for test as well as the sampling method and sampling frequency. Therefore, in actual testing at the site or production plant, it is necessary to follow the recommendation from standards in order to assess the quality and property of the materials tested.
3. Sample Reduction
When the amount of material has to be reduced it is essential that the representative nature of the sample be maintained. Suitable methods for sample division are by coning and quartering or by the use of sample divider. 2. TESTING FOR LOOSE BULK DENSITY
2.1 Introduction
The loose bulk density,
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