exp-2.docx

DE LA SALLE UNIVERSITY DASMARINASDasmarias, CaviteCOLLEGE OF ENGINEERING, ARCHITECTURE AND TECHNOLOGY

CIVIL ENGINEERING PROGRAMCONSTRUCTION MATERIALS AND TESTING

Name: Amos, Patricia H.Date Submitted: August 7, 2015C/Y/S: ESE41EXPERIMENT 2SPECIFIC GRAVITY AND ABSORPTION OF FINE AGGREGATEPURPOSE: To obtain the bulk specific gravity, apparent specific gravity and absorption of fine aggregate (AGG-5). RELATED STANDARDS: ASTM C128DEFINITIONS: Refer to Test AGG-1.EQUIPMENTS: Balance, pycnometer (or a volumetric flask of 500 cm3 capacity or a fruit jar fitted with a pycnometer top), oven.SAMPLE: About 500 g of fine aggregate sample.PROCEDURE:1. Weigh the test sample: A (g).2. Cover the test sample with water, either by immersion or by the addition of at least 6 percent moisture to the sample, and permit to stand for 24 4 h.3. Decant excess water with care to avoid loss of fines. Spread the sample on a flat non-absorbent surface exposed to a gently moving current of warm air, and air frequently to secure homogenous drying. Continue until the sample approaches a free-flowing condition. When the specimen has reached a surface dry condition, it is called saturated surface dry (SSD). 4. Weigh the SSD sample: B (g).5. Fill the pycnometer with water to the top, and weigh: C (g).6. Remove part of the water, and approximately 90 percent of its capacity.7. Fill with additional water to approximately 90 percent of its capacity.8. Roll, invert, and agitate the pycnometer to eliminate all air bubbles.9. Bring the water level in the pycnometer to its calibrated capacity.10. Determine the total weight of the pycnometer, specimen, and water: D (g).11. Remove the sample from the pycnometer, dry to constant weight at a temperature of 110 5C, cool, and weigh: E (g).12. Calculate the specific gravity and absorption.

Bulk specific gravity, dry =

Bulk specific gravity, SSD = Apparent specific gravity =

Absorption = x 100

DISCUSSION:Specific gravity and Absorption are properties of aggregates. The important values obtained in this procedures are the dry weight of the sample, the weight of the SSD, the weight of the Pycnometer filled to the top with water, the total weight of the pycnometer, specimen and water, and the weight of the dry sample from the pycnometer. These values will be used to calculate specifically the bulk specific gravity (Dry and SSD), Apparent specific gravity, and Absorption.

COMPUTATIONS:B = 957.8 gC = 1409.80 gD = 1918.36 g

Bulk specific gravity, SSD =