Présentation Mounanga et al. 7 th CANMET/ACI_Berlin 2003

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Influence Of Superplasticizer On Activation Energy And Autogenous Shrinkage Of A

Cement Paste At Early Age

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Temperature (°C) Age (h)

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Temperature (°C) Age (h)

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Age (h)

Ref

PCE (0,05%) SNF (0,10%)

Hydration degree (%)

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0 6 12 18 24

Age (h)

Ref

PCE (0,05%) SNF (0,10%)

Hydration degree (%)

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Hydration degree (%)

Ref

PCE (0,05%) SNF (0,10%)

Ca(OH)₂ (g/g of cement)

0 0,03 0,06 0,09 0,12

0 6 12 18 24

Age (h)

Ref

PCE (0,05%) SNF (0,10%)

Ca(OH)₂ (g/g of cement)

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Age (h)

Room temperature Ref

PCE (0.05%) SNF (0.10%) SMF (0.15%)

Temperature (°C)

0 20 40 60 80

0 6 12 18 24 30 36

Age (h)

Room Temperature Ref

PCE (0.05%) SMF (0.15%) SNF (0.10%)

Temperature (°C)

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Ref.PCE (0.05%) SNF (0.10%) SMF (0.15%)

Chemical shrinkage (mm3 /g of initial anhydrous cem.)

Age (hours)

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PCE (0.05%)

Chemical shrinkage with PCE (0.05%) (mm3 /g of initial anhydrous cem.)

Chemical shrinkage without admixture (mm³/g of initial anhydrous cem.)

Phase 1

Phase 2

y=0.37x+0.01 y=1.36x-13.54

approx. 9.1h

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Volumetric autogenous shrinkage (mm3 / g of initial anhydr. cem.)

Age (hours)

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10°C 20°C 40°C

Volumetric autogenous shrinkage (mm3 / g of initial anhydr. cem.)

Age (hours)

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0.0031 0.0032 0.0033 0.0034 0.0035 0.0036

Ref.PCE (0.05%)

R*Ln(1/Initial Vicat set time) (J/mol.K)

1/Temperature (1/K) y = -27312x + 81.808

R² = 0.98 y = -29342x + 91.252

R² = 0.99 40°C

30°C

20°C

10°C

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Ref.PCE (0.05%)

R*Ln(1/Vicat setting time) (J/mol.K)

1/Temperature (1/K) y = -34268x + 110.95

R² = 0.98 y = -36871x + 123.79

R² = 0.95 40°C

30°C

20°C

10°C

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Age (hours)

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