XAVIER UNIVERSITY ATENEO DE CAGAYAN______________ COLLEGE OF ENGINEERING DEPARTMENT OF CIVIL ENGINEERING

CONSTRUCTION AND MATERIALS TESTING LABORATORY (CE 43 L)Experiment No.: 1Experiment Title: Reducing Field Sample of Aggregate to Test Sample

Filed by:Group Name: ArcGISGroup Members: 1. Arc Siede Cabugsa2. Melvin Chris Encarnacion

Date Performed:June 29, 2015Date Filed:July 3, 2015

CriteriaWeightPoints

Format

10%

Methodology

10%

Data and Results

30%

Data Analysis

30%

Conclusion

20%

Total

100%

Instructor:_______________________Engr. Julie Ann I. Dela Cruz

IntroductionAggregates are typically stored in a bin or a stockpile. Quartering is the process of reducing a representative sample to a convenient size, or of dividing a sample into two or more smaller samples for testing. This is a non-mechanical method of reducing a sample. Accuracy in quartering is most easily attained, in the case of fine and all in aggregate, with damp materialObjectivesTo obtain laboratory sample of aggregates from stockpiles and perform quartering twice.Materials and ApparatusesShovel 2 setsScoop 1 setBoom 1 setGloves 1 set/personIndustrial Apron 1 set/personAggregatesMethodology1. Obtain a sample of aggregate (about 50 kg) from three places in the stockpile: from the top third, at the midpoint, and from the bottom third of the volume of the pile.

2. Place the field sample on a hard, clean level surface.

3. Mix the material thoroughly by turning the entire sample three times.4. Shovel the entire sample into a conical pile.

5. Carefully flatten the conical to a uniform thickness and diameter by pressing down the apex with a shovel. (The diameter should be approximately four to eight times the thickness).

6. Divide the flattened mass into four equal quarters with a shovel.

7. Remove two diagonally opposite quarters. Brushed the cleared spaces clean.

8. Mix and quarter the remaining materials until the sample is reduced to the desired size.

Data and ResultsObtaining about 50kg of aggregates.

Setting the collected aggregates in a level surface.

First quartering of the aggregates.

First set of removing two diagonally opposed aggregates.

Mixing again the aggregates for the second set of quartering.

Second set of quartering the remaining aggregates.

Second set of removing two diagonally opposed aggregates.

Gathered aggregate after two set of quartering.

ConclusionThe aggregate sample were obtained from a stockpile outside our laboratory at Xavier University and were subjected to the appropriate laboratory procedures in accordance with ASTM C702 and D75. Through ASTM D75 the researchers were able to determine the in-situation or in-storage condition of the aggregate. Meanwhile, ASTM C702 is the procedure for reducing the sample to sample size required for laboratory testing while insuring that the sample size for laboratory testing represents the stockpile or the total supply of aggregate. Therefore, following the procedures will ensure that the quality of the aggregate result is true and correct and prevent problems that might affect production of quality concrete.Reference CivilBlogOrg (2015, January 6). How to Reduce Gross Aggregate Sample to Test Sample by Quartering or Coning Method. Retrieved from http://civilblog.org/2015/01/06/how-to-reduce-gross-aggregate-sample-to-test-sample-by-quartering-or-coning-method/ Reducing Field Sample of Aggregate to Test Sample. ASTM C 702, D75