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 paste – without air
Example: CPA 55 in pure paste – without 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
