Table 3 Thermo-analytical data of hardened neat WOPC and hardened WOPC-MS pastes containing 0.75% MS after 7 and 28 days of hydration.

From: Boosting the mechanical performance and fire resistivity of white ordinary portland cement pastes via biogenic mesoporous silica nanoparticles

 

Stage

Temp. range, °C

Tonset, °C

Tmax, °C

Wloss, %

Rw1000, °C

R2

A, 1/s

Ea, kJ/mol

∆Ha, kJ/mol

∆Sa, J/mol.K

∆Ga, kJ/mol

Mix WMS0-7d

I

32–380

99

175

9.087

80.95

0.93

10.60

25.23

21.50

-228.725

123.97

II

400–609

463

526

4.324

0.98

2.94 × 1010

183.03

176.38

-52.7186

218.50

III

629–879

629

775

5.414

0.99

1.21 × 1007

171.40

162.69

-119.772

288.21

∑ 379.66

∑ 360.57

∑ -401.22

∑ 630.69

Mix WMS3-7d

I

24–386

100

127

8.87

80.60

0.93

2.99

19.67

16.36

-238.297

111.68

II

472–576

472

509

3.668

0.98

2.61 × 1013

221.74

215.23

3.932746

212.16

III

576–805

618

737

5.635

0.99

2.57 × 1008

188.80

180.40

-94.0709

275.41

∑ 430.22

∑ 412.00

∑ -328.44

∑ 599.25

Mix WMS0-28d

I

24–284

98

150

5.776

80.71

0.91

5.70

20.59

17.07

-233.408

115.80

II

492–596

483

520

4.399

0.99

1.15 × 1012

204.56

197.97

-22.187

215.56

III

596–929

608

753

6.98

0.98

271578.4

141.10

132.57

-151.196

287.69

∑ 366.25

∑ 347.61

∑ -406.79

∑ 619.06

Mix WMS3-28d

I

24–369

100

157

9.734

81.36

0.97

9.37

24.33

20.76

-229.406

119.40

II

473–577

469

518

4.647

0.97

1.41 × 1013

219.98

213.40

-1.2992

214.43

III

577–806

601

744

3.898

0.97

4.86 × 1016

353.53

345.08

64.34119

279.64

∑ 597.84

∑ 579.23

∑ -166.36

∑ 613.47