Lecture #5 - Alfred's Clay Store - Alfred University

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Particle Shape<strong>Clay</strong>• Flatness of clay particles– Surface tension in water allows suction to develop betweenparticles– Allows particles to slide past each other (like wet plates ofglass)• Granular particles lack these qualities (regardless oftheir size)
Particle Size Distribution• Bodies that rely too much on fine clays don’thave enough resistance (i.e. their yield point istoo low), and due to their large surface area (andlarge water content) tend to shrink a lot• However, too much coarse materials allow waterto easily permeate the body, weakening thestructure (loosing shape during forming)• A wide distribution of particle sizes (large,medium and small) helps increase the body’sinterlocking qualities– increases strength (holds shape better)
Page 1 and 2: Water,Workability,and MixingLecture
Page 3 and 4: Types of Water
Page 5 and 6: Water of Plasticity For Clays• Va
Page 7 and 8: Pore Water• Occupies the pores of
Page 9 and 10: Crystal-Edge Water• Water that is
Page 11 and 12: PlasticityHaving looked at the stru
Page 13 and 14: Initial ResistanceMovementbeforecra
Page 15 and 16: Plastic Flow in a Typical BodyShear
Page 17 and 18: Particle Size• Smaller particle s
Page 19 and 20: • QuantifyingPlasticity• Benton
Page 22 and 23: Flocculation• A Clay particle exh
Page 24 and 25: Flocculation• Clays are usually s
Page 28 and 29: Diversity in particle size ensures
Page 30 and 31: Narrow rangeWide range
Page 32 and 33: CPFT = Cumulative Percent Finer Tha
Page 34 and 35: Moisture Content• As we’ve alre
Page 36 and 37: Moisture Retention• Fine clays ho
Page 38 and 39: Souring• Secondary clays tend to
Page 40 and 41: Mixing• Homogenous mixtures are c
Page 42 and 43: Relative scale of materials in a cl
Page 44 and 45: Given what we now know aboutrelativ
Page 46 and 47: Soldner Mixer• The safest clay-mi
Page 49 and 50: Mixing ChronologyFor the Muller•
Page 51 and 52: Blunging• Ensures complete/homoge
Page 54 and 55: • High speed shear head(cuts like
Page 56 and 57: Regular MixingHigh Intensity Mixing
Page 58 and 59: • Pumps (pushes)slip into porouse
Page 61 and 62: Pugging• Pugging helps break down
Page 63: The shredder stage• Air pockets a
Page 70: ReferencesThe Chemistry and Physics

Lecture #5 - Alfred's Clay Store - Alfred University

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