Sieve Analysis - Infiltrator Water Technologies

Interpreting the Sieve Analysis

Dennis Fogg, Technical AdvisorPresby Environmental, Inc.

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Today’s Agenda:

Define System SandWhy it’s Important

Understanding the Sieve AnalysisField Testing with Spec-Check®

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What is System Sand?

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Well graded sand meeting the requirements of ASTM C33

Advanced Enviro‐Septic® (AES)

Advanced Treatment Leachfield(ATL)

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ASTM C33 “Fine Aggregate”

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Sieve ASTM E11 Sieve Size % Passing3/8” 9.5‐mm [.375”] 100#4 4.75‐mm [.187”] 95 to 100#8 2.36‐mm [.0937”] 80 to 100#16 1.18‐mm [.0469”] 50 to 85#30 600‐µm [.0234”] 25 to 60#50 300‐µm [.0117”] 5 to 30#100 150‐µm [.0059”] 0 to 10#200 75‐µm [.0029”] 0 to 3

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Why C33 Sand is Important

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Well Graded Poorly Graded Gap Graded

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Capillary AttractionMeniscus

Attraction is in all directions

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Capillary AttractionInfiltrator Water Technologies

Plan View Section View

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Particle SizeInfiltrator Water Technologies

Fine

r Pa

rtic

le S

ize

Water Retention

Satu

ratio

n

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O2 Delivery to Biologically Active Surface Areas

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Particle Size Distribution Report(Sieve Analysis)

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Coarse

Fine

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Outline of Test Procedure• Bake sample & weigh• Wash sample to remove fines (< #200)• Bake again & weigh again• Place sample in top of sieve stack & shake• Measure weight retained on each screen

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Washing Sample

SandSilt & Clay

GasCapillary Pore

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Graph

Pass/FailTable

Properties

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Upper Limit

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% F

iner Lower Limit

Outside Limit

Particle Size Increasing (mm)

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C33 Screens Highlighted

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Fails

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Coefficient of Uniformity

= (D60 ÷ D10)

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Effective Particle Size

D10 is the size at which 10% are smallerD60 is the size at which 60% are smaller

Cu > 4 indicates well graded

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Upper Limit

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Lower Limit

Outside LimitOutside Limit

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Fails

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Handwritten Report Common

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86.3–6.1 = 80.2

100% 0%0.0

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Sieve % Passing3/8” 100#4 95 to 100#8 80 to 100#16 50 to 85#30 25 to 60#50 5 to 30#100 0 to 10#200 0 to 3

x

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Perc

ent

Fine

r

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Perc

ent

Fine

r

Sieve % Passing3/8” 100#4 95 to 100#8 80 to 100#16 50 to 85#30 25 to 60#50 5 to 30#100 0 to 10#200 0 to 3

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C33 Fineness Modulus  (2.3 – 3.1)

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15% Silt/Clay

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Summary

• ASTM C33 sand is important to our systems• Balanced water movement through sand• Particle size report come in many forms• Much more information than is needed• Can always send to technical support

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Spec-Check®

Cannister

Screens Settling Tube

Cup

Funnel

Storage Bag

Instructions

#200

#100

#30

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Silt & Clay

Slurry3%5%

Contact Us

dfogg@presbyeco.cominfo@presbyeco.com

Infiltrator‐water‐technologies

PresbyEnvironmental.com

@infiltratorwater

@infiltrator water

@infiltrator

800.473.5298

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