Coarse aggregate is placed in a rigid bucket and rodded with a tamping rod to determine its unit weight. The following data are obtained: Volume of bucket = ½ ft3 Weight of empty bucket Weight of bucket filled with dry rodded coarse aggregate = 20.3 lb Trial 1 = 69.6 lb Trial 2 = 68.2 lb Trial 3 = 71.6 lb %3D a. Calculate the average dry-rodded unit weight b. If the bulk dry specific gravity of the aggregate is 2.620, calculate the per- cent voids between aggregate particles for each trial.

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5.14 Coarse aggregate is placed in a rigid bucket and rodded with a tamping rod to determine its unit weight. The following data are obtained: Volume of bucket = ¹/2 ft³ Weight of empty bucket = 20.3 lb Weight of bucket filled with dry rodded coarse aggregate: Trial 176.6 lb Trial 275.1 lb Questions and Problems 217 Trial 3 78.8 lb a. Calculate the average dry-rodded unit weight b. If the bulk dry specific gravity of the aggregate is 2.620, calculate the percent voids between aggregate particles for each trial.

2. A sample of fine aggregate weighs 501.2 g when SSD and 491.6 g when OD. The flask weighs 540.6 g when filled with water and 843.1 g when filled with the aggregate sample and water. Calculate the bulk specific gravity, apparent specific gravity and percent absorption.

The following table provides data obtained during a specific gravity and absorption test on coarse aggregate. Using the data, determine the a) apparent bulk specific gravity, b) bulk SSD specific gravity, and c) absorption of the coarse aggregate.

Referring to the aggregate gradations A, B, and C in Figure P5.26, answer the following questions: a. What is the maximum size of each gradation? b. What is the nominal maximum size of each gradation? c. Classify each gradation as dense, open, or gap indicating the reason for each classification. 100 A 80- 60 40 0.075 0.30 1.18 2.36 4.75 9.5 12.5 19.0 25.0 0.15 0.60 Sieve sizes (mm) FIGURE P5.26 Percent passing 20

The following information is available from a specific gravity test on fine aggregate: wt of SSD sand = 509 g wt of pycnometer plus sand plus water = 2665g wt of pycnometer plus water = 2329 g wt of oven dry sand = 491 g Calculate the bulk specific gravity (SSD), bulk specific gravity, apparent specific gravity, and absorption (dry) of the material.

Void Content—Calculate the void content in the aggregate using the bulk densitydetermined by either the rodding, jigging or shoveling procedure, as follows:

Distinguish porosity from voids content for aggregate with the help of schematic diagrams.

Three samples of fine aggregate were taken from the same stockpile and have the properties shown below. Determine in percentage: (a) total moisture content of each sample, (b) free moisture content of each sample, and (c) the average values of each from the stockpile. Measure Wet Mass (g) Dry Mass (g) Absorption (%) A 521.0 491.6 2.5 Sample B 522.4 491.7 2.4 C 523.4 492.1 2.3