Procedure 7. Calculation Method B 8. Apparatus 9. Procedure Calculations Method C Rapid Test Calculations Report Precision Add to Cart. Record the weight of the wet soil. Record this and all moisture weights to the nearest 0. Calculate the percent moisture to the nearest 0. Compute and record dry density to the nearest 0.
Continue this process, with the remaining samples, until there is a decrease in the wet density per cubic foot. Based on the results obtained from conducting consecutive Proctors with changes in moisture, plot each test result on the cross-ruled area on the form with the moisture content plotted on the abscissa x and the density on the ordinate y. After all the results are plotted, draw a smooth flowing curve through or close to the plotted points.
From the peak of the curve, select the maximum dry density and optimum moisture. Report the maximum dry density to the nearest 1-lb. NOTES During compaction, the mold shall rest firmly on a dense, uniform, rigid, and stable foundation or base. This base shall remain stationary during the compaction process.
Each of the following has been found to be a satisfactory base on which to rest the mold during compaction of the soil: 1 a block of concrete with a mass not less than lbs 90 kg supported by a relatively stable foundation; 2 a sound concrete floor; and 3 for field applications such surfaces are found in concrete box culverts, bridges, and pavements. The moisture-density test is used to establish a value of density on which construction requirements can be based.
It is a test conducted on a single identifiable soil and results may vary considerably between different soils. Make every effort to space the moisture contents no further apart than 2. One-Point Moisture Density Relationship with Typical Moisture-Density Curve Method After analyzing a large number of both ND T 99 and ND T moisture-density curves that generally represent statewide soil types, it was found the curves follow the trends shown on the graphs on the following pages.
The graphs with the following procedure may be used in place of performing the entire moisture- density relationship test. Thoroughly mix the soil sample with water and dampen it approximately to, but not over, Optimum Moisture.
If the point lies directly on a curve, follow this curve to its peak and read off the maximum dry density and optimum moisture content. If the point lays in-between two curves, follow the two curves to their peaks and interpolate the maximum dry density and optimum moisture content. NOTES When the rubber balloon method is used for the density test, use the same material from the hole for the one-point determination.
To get sufficient material, enlarge the hole after the rubber balloon test is complete and use the additional material collected. In order to perform the test in conjunction with and at the same location as the in- place density test, there are steel-capped, wooden pedestals available to support the mold base plate. Year Number of Pages 7. This method of test covers the determination of bulk specific gravity G mb of specimens of compacted hot mix asphalt HMA. This method should not be used with samples that contain open or interconnecting voids or absorb more than 2.
If the sample contains open or interconnecting voids or absorbs more than 2. The bulk specific gravity G mb of the compacted HMA may be used in calculating the unit mass of the mixture. Note 1 —The values for bulk specific gravity G mb obtained from T or T may differ. Care should be exercised when comparing test results from T and T The values stated in SI units are to be regarded as the standard.
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