Cement: Strength development

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Cement: Strength development

Strength development

Influencing factors:

Let’s brainstorm …

Strength development

Potential parameters

o W/C

o cement fineness

o alkali sulphates

o temperature

o mixing energy

o admixtures (accelerators – retardant)

Strength development influencing factors

W/C

Cement fineness

Others: alkali sulfates, temperature, mixing energy, admixtures (accelerators – retardant)

W/C

How does porosity appear?

When Cement + Water   >>   Hydrates

Cement volume<Hydrates volume<Cement+Water volume

Exact theoretical quantity

More water than theoretical quantity

Less water than theoretical quantity

Example: CPA 55 in pure pastewithout air

Example: CPA 55 in pure pastewithout air

With W/C = 0.50 …

Compressive strength in MPa

Cement fineness

SSB variation

Relation porosity/strength (W/C = 0,5 ; 28 days)

Pores repartition of various mortar (W/C = 0,5 ; 28 days)

Others

Alkaline sulfates

Temperature

Mixing

 

 

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