15353Strength

For DSP, strength development is very rapid after a delayed setting time of 15 to 20 h, so in 2 days a strength of 100 MPa is obtained. However, strengths continue to increase with extended moist curing. The compressive strength of 345 MPa is the highest reported value for DSP. This may be due to the elimination of macroporosity during the hot curing cycle. Using a convoluted stainless steel aggregate contributes to the strength of DSP.

It is important that a complete dispersion of the MS can be achieved. The use of a chemical dispersing agent is not sufficient if low shear mixing is used. High shear mixes will allow compressive strengths to be significantly increased. It is possible to achieve a paste strength of over 200 MPa by optimizing processing.

Pore diameter, |m

FIGURE 15.7 Pore size distribution of DSP cement paste compared to conventional cement paste.

Pore diameter, |m

FIGURE 15.7 Pore size distribution of DSP cement paste compared to conventional cement paste.

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