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The HM-275 Quartering Cloth Kit is used for standard sampling and splitting procedures for aggregates as described in ASTM C702 and AASHTO R 76. Kit Components can be ordered separately. HMA-591 Quartering Cloth is a 6x8ft, heavy-duty, finished canvas. The HMA-592 Square-point Shovel has a 9.75x12in (248x305mm) blade and a 30in (762mm) D-handle. The HMA-593 Broom is 16in (406mm) wide and has a 4ft (1.2m) handle. Made of wood with a brown Prolene plastic brush head, this durable broom is ideal for heavy sweeping.

This is a demonstration on how to reduce a bulk sample of aggregate into approximate equal portions using the quartering method, which is completed to create a convenient sized sample for testing in a manner that represents the bulk specimen.

The quartering method is generally used in situations where an adequate mechanical splitter is unavailable.

The quartering apparatus should consist of a scoop, shovel, or trowel with a straight edge, a broom or brush, and a six by eight foot canvas blanket.

For this demonstration we will be dividing a bulk sample in accordance with ASTM C702 and AASHTO T 248 standards using the Gilson HM-275, a Quartering Cloth Kit.

To divide a sample you first place the sample on the canvas blanket. Now mix the sample by turning the entire sample over three times with the shovel. Shovel the sample into a conical pile by depositing each shovelful on top of the previous one. Flatten the conical pile to a uniform thickness and diameter by pressing down with the shovel until the diameter is approximately four to eight times the thickness of the pile. Now divide the flattened sample into four equal quarters with a shovel or trowel. Next remove two diagonally opposite quarters making sure to remove all the fine material. Successively mix and quarter the remaining material in the same fashion as the original sample until the desired sample quantity is obtained.

(Failure to carefully follow the procedures in this practice could result in providing a non-representative sample to be used in subsequent testing.)

Save the unused portion of the original sample until all testing is completed.

For any questions concerning dividing aggregate samples or for any Gilson product, please contact the Gilson Technical Support team.

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