More C It is also expressed as the ratio of the density of the aggregate particles to the density of water. Relative density specific gravity SSD is used in the determination of surface moisture on fine aggregate by displacement of water in Test Method C Relative density specific gravity SSD is used if the aggregate is in a saturated surface-dry condition, that is, if its absorption has been satisfied. Alternatively, the relative density specific gravity OD is used for computations when the aggregate is dry or assumed to be dry. This value is not widely used in construction aggregate technology.
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More D An increase in void content by these procedures indicates greater angularity, less sphericity, rougher surface texture, or combinations thereof. A decrease in void content results is associated with more rounded, spherical, or smooth-surfaced fine aggregate, or a combination thereof. This void content depends on grading as well as particle shape and texture. A sample consisting of single-size particles will have a higher void content than a graded sample. Therefore, use either one method or the other as a comparative measure of shape and texture, and identify which test method has been used to obtain the reported data.
Test Method C does not provide an indication of shape and texture directly if the grading from sample to sample changes. Typically, the material used to make up the standard graded sample can be obtained from the remaining size fractions after performing a single sieve analysis of the fine aggregate. However, Test Method B provides additional information concerning the shape and texture characteristics of individual sizes.
In general, high void content suggests that the material could be improved by providing additional fines in the fine aggregate or more cementitious material may be needed to fill voids between particles. The effectiveness of these test methods of determining void content and its relationship to particle shape and texture depends on the relative density specific gravity of the various size fractions being equal, or nearly so. The void content is actually a function of the volume of each size fraction.
If the type of rock or minerals, or its porosity, in any of the size fractions varies markedly it may be necessary to determine the specific gravity of the size fractions used in the test. Scope 1. When void content is measured on an as-received fine-aggregate grading, it can be an indicator of the effect of the fine aggregate on the workability of a mixture in which it may be used. Two use graded fine aggregate standard grading or as-received grading , and the other uses several individual size fractions for void content determinations: 1.
See the Section 9 for the grading. For this test method, each size is tested separately. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Tushicage Aggregate testing Lab Services: In general, high void content suggests that the material could be improved by providing additional fines in the fine aggregate or more cementitious material may be needed to fill voids between particles. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Two use graded fine aggregate standard grading or as-received gradingand the other uses several individual size fractions for void content determinations:. Request Quote Client Login. Uncompacted void content is calculated using the bulk dry specific gravity of the fine aggregate.
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