AASHTO T99-21 pdf free download

AASHTO T99-21 pdf free download.Moisture- -Density Relations of Soils Using a 2.5-kg (5.5-Ib) Rammer and a 305-mm (1 2-in.) Drop.
1.6. The following applies to all specified limits in this standard: For the purposes of determining conformance with these specifications, an observed value or a calculated value shall be rounded off“to the nearest unit”in the last right-hand place of figures used in expressing the limiting value, in accordance with ASTM E29. 1.7. The values stated in SI units are to be regarded as the standard. 1.8. The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of R 18 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with R 18 alone does not completely assure reliable results. Reliable results depend on many factors; following the suggestions ofR 18 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: ■M 231, Weighing Devices Used in the Testing of Materials ■ R 76, Reducing Samples of Aggregate to Testing Size ■ T 19M/T 19, Bulk Density (“Unit Weight”) and Voids in Aggregate ■T 85, Specific Gravity and Absorption of Coarse Aggregate ■ T 217, Determination of Moisture in Soils by Means of Calcium Carbide Gas Pressure Moisture Tester ■T 255, Total Evaporable Moisture Content of Aggregate by Drying T 265, Laboratory Determination of Moisture Content of Soils ■T 310, In-Place Density and Moisture Content of Soil and Soil- Aggregate by Nuclear Methods (Shallow Depth) 2.2. ASTM Standards: D2 168, Standard Practices for Calibration of Laboratory Mechanical-Rammer Soil Compactors E11, Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves ■E29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications 3. APPARATUS 3.1. Mold Assembly (Mold, Collar, and Base Plate)- -Molds shall be solid-wall, metal cylinders manufactured with dimensions and capacities shown in Sections 3.1.1, 3.1.2, and Figures 1 and 2. They shall have a detachable collar approximately 60 mm (2.375 in.) in height, to permit preparation of compacted specimens of soil-water mixtures of the desired height and volume. The mold and collar shall be so constructed that it can be fastened firmly to a detachable base plate made of the same material. The base plate shall be plane to 0.005 in. as shown in Figures 1 and 2. 3.1.1. Molds having a volume of 0.000943士0.000014 m3 (0.0333土0.0005 ft) shall have an inside diameter of 101.60土0.40 mm (4.000士0.016 in.) and a height of 116.40土0.50 mm (4.584士 0.018 in.) (Figure 1). Determine the mold volume in accordance with the“Calibration of Measure” section ofT 19M/T 19 for Unit Mass of Aggregate.
3.1.2. Molds having a volume of 0.002 124土0.000025 m3 (0.07500土0. 0009 ft3) shall have an inside diameter of 152.40土0.70 mm (6.000土0.026 in.) and a height of 116.40土0.50 mm (4.584土 0.018 in.) (Figure 2). Determine mold volume in accordance with the“Calibration of Measure” section ofT 19M/T 19 for Unit Mass of Aggregate. 3.1.3. Alternate types of mold assemblies with volumes that meet the requirements of Sections 3.1.1 and 3.1.2 may be used. Alternate types of mold assemblies must be constructed of a rigid, inflexible material; must not deform during compaction; and be cylindrical with a detachable collar and detachable base plate as described in Section 3.1. The volume of alternative types of mold assemblies shall be determined and verified in accordance with the“Calibration of Measure” section ofT 19M/T 19 for Unit Mass of Aggregate as is required in Sections3.1.1 and 3.1.2. When alternate mold types are first used they should be tested on several different soil types and the results compared to tests results from mold types specified in Sections 3.1.1, 3.1.2, and Figures 1 and 2. Altermnative molds are aceptable when test results meet the single operator repeatability limits of this standard.AASHTO T99-21 pdf download.