1 Introduction
2 Raw Materials and Test Methods
2.1 Raw Materials
Brand | C3S | C2S | C3A | C4AF |
---|---|---|---|---|
P.O52.5 | 40.62 | 29.58 | 10.42 | 9.15 |
Raw materials | P.O52.5 | LP | QP | GP |
---|---|---|---|---|
Specific surface area (m2/kg) | 438.3 | 369.5 | 336.2 | 330.3 |
P.O52.5 | LP | QP | GP | |
---|---|---|---|---|
Chemical compositions (%) | ||||
CaO | 60.68 | 49.08 | 3.06 | 5.46 |
SiO2 | 21.96 | 5.05 | 59.22 | 16.59 |
Al2O3 | 5.86 | 1.62 | 20.39 | 16.59 |
Fe2O3 | 3.01 | 0.61 | 9.01 | 5.02 |
K2O | – | 0.52 | – | 0.63 |
Na2O | – | 0.04 | – | – |
MgO | 2.91 | 1.59 | 3.03 | 2.62 |
TiO2 | – | 0.07 | – | – |
MnO | – | 0.09 | – | – |
P2O5 | – | 0.16 | – | – |
SO3 | 2.38 | 0.22 | – | – |
I.L. | 2.58 | 40.88 | 4.86 | 4.84 |
Total | 99.38 | 99.93 | 99.57 | 99.39 |
2.2 Test Methods
3 Results and Discussion
3.1 Influence of SPs on the Standard Viscosity and Setting Time
SP | Performance | Percentage content (%) | |||||
---|---|---|---|---|---|---|---|
0 | 5 | 10 | 15 | 20 | 30 | ||
LP | Initial setting time (min) | 176 | 158 | 178 | 176 | 177 | 176 |
Final setting time (min) | 223 | 210 | 226 | 226 | 233 | 235 | |
Normal consistency (%) | 25.8 | 25.8 | 26.0 | 26.4 | 26.6 | 27.2 | |
QP | Initial setting time (min) | 175 | 174 | 185 | 185 | 178 | 180 |
Final setting time (min) | 238 | 238 | 247 | 250 | 241 | 238 | |
Normal consistency (%) | 25.8 | 26.0 | 26.4 | 26.6 | 26.8 | 27.4 | |
GP | Initial setting time (min) | 175 | 192 | 199 | 191 | 194 | 190 |
Final setting time (min) | 220 | 225 | 229 | 223 | 229 | 235 | |
Normal consistency (%) | 25.8 | 26.0 | 26.2 | 26.6 | 26.8 | 27.4 |
3.2 Influence of SP on the Hydration Thermal of Cement
No | Raw materials (mg) | Remarks | ||
---|---|---|---|---|
Cement | SP | Water | ||
CN | 500 | 0 | 500 | Sample for reference |
CL1 | 400 | 100 | 500 | 20 % of LP was internally mixed |
CL2 | 400 | 100 | 400 | 20 % of LP was externally mixed |
CQ | 400 | 100 | 400 | 20 % of QP was externally mixed |
CG | 400 | 100 | 400 | 20 % of GP was externally mixed |