Optimization and Hydration Mechanism of Composite Cementing Material for Paste Filling in Coal Mines

Figure 4

Trends of compressive strengths as a function of sample composition when the gypsum content is (a) 0–5%, (b) 5–10%, (c) 10–15%, and (d) 15–20%. CSA-sulphoaluminate cement; P-gypsum.

(a)

(b)

(c)

(d)