Summary

Each sealant was tested for a minimum of at least 36000 cycles that exerted a 15 % shear displacement to the samples. The results for each sealant are summarized in Figs. 4-13 and Tables 2-10. The shear strain imposed by this testing is conservative. Realistic thermal movement displacements for in-service curtain – walls will rarely approach movements of 15 %. Products capable of 12.5 % movement have been per­forming without failure for many years lending credence to this point.

15% greeter

(cross section)

FIG. 5—Behavior of Sealant 1.

FIG. 6—Behavior of Sealant 2.

FIG. 7—Behavior of Sealant 3.

FIG. 9—Behavior of Sealant 5.

FIG. 10—Behavior of Sealant 6.

FIG. 11—Behavior of Sealant 7.

FIG. 13—Behavior of Sealant 9.

TABLE 2—Details of Sealant J.

2 Part 12.5 % Alkoxy

15 %

Elongation cycles

Average values

.Standard deviations

Fatigue cycles

0

36 5000

0

36 500

Stress @ 10 %, kPa

25.392

13.455

0.2691

2.1114

Stress @ 25 %, kPa

44.0289

27.393

0.5727

4.1814

Stress @ 50 %, kPa

68.241

42.504

1.3386

8.4249

Stress @ 100 %, kPa

97.29

34.6242

2.5323

0.6969

Max stress, kPa

97.635

46.713

2.9394

10.074

Max % strain

69.5244

47.679

3.9123

2.7807

TABLE 3-

—Details of Sealant 2.

2 Part 12.5 % Alkoxy

15 % Elongation cycles

Average values

Standard deviations

Fatigue cycles

0

36 500

0

36 500

Stress @ 10 %, kPa

Stress @ 25 %, kPa

44.16

28.221

3.8847

13.7448

Stress @ 50 %, kPa

72.312

59.133

4.5678

16.0701

Stress @ 100 %, kPa

116.058

1.8768

Max stress, kPa

109.779

48.369

9.4116

30.4566

Max % strain

66,93

34.5

6,0168

13.3239

TABLE 4—Details of Sealant 3.

2 Part 12.5 % Alkoxy

15 % Elongation cycles, 1873-164

Average values

Standard deviations

Fatigue cycles

0

36 500

0

36500

Stress @ 10 %, kPa

13.8

13.8

0.2139

0.828

Stress @ 25 %, kPa

31.05

31.05

0.1725

1.794

Stress @ 50 %, kPa

55.752

55.752

0.5451

2.622

Stress @ 100 %. kPa

95.979

92.322

0.8418

4.071

Max stress, kPa

114.264

117.369

2.1459

11.454

Max % strain

103.224

130.272

5.9961

11.247

TABLE 5-

Details of Sealant 4.

2 Bait 20 9 Alkoxv

15 % Elongation cycles

Averagi

і values

Standard deviations

Fatigue cycles

0

38 346

0

38 346

Stress ft? 10 %, kPa

15.7596

11.2608

1.0212

0.7383

Stress ft? 25 %, kPa

30.1461

25.1367

1.4283

0.7452

Stress ft? 50 9c, kPa

47.4996

45.5193

1.6491

0.4899

Stress ft? 100 9, kPa

74.3337

73.7334

1.6905

1.1661

Max stress, kPa

102.7272

98.3595

12.8271

8.832

Max % elongation

135.516

132.9009

34.7484

10.419

15 9 Elongation cycles

TABLE 6—Details of Sealant 5.

I Fart 25 9i Aikoxy___________________ Average values_______________________ Standard deviations

Fatigue cycles Stress ft? 10 9c, kPa

0

36 500

0

36 500

Stress ft? 25 9c, kPa

39.951

27.531

2.0631

2.3391

Stress @ 50 9, kPa

55.821

47.334

2.1942

8.5974

Stress ft? 100 9, kPa

81.765

81.213

4.3401

2.0424

Max stress, kPa

88.941

69.138

6.486

14.8833

Max 9c strain

100.74

68.31

13.5378

5.5269

TABU7. 7—Details of Sealant 6.

15 % Elongation cycles

1 Part 25 9t Oxime

Average values

Standard deviations

Fatigue cycles

0

36 696

0

36 696

Stress ft? 10 9c, kPa

16.353

11.4954

0.2139

3.5811

Stress ft? 25 9, kPa

28.0416

20.0721

0.2829

0.5037

Stress 50 9c, kPa

39.2196

31.6503

0.2208

2.7117

Stress ft? KM) 9, к Pa

56.856

54.2961

0.8901

1.8009

Max stress, kPa

85.2426

72.6363

6.6654

1.1109

Max 9c strain

163.9233

128.2227

15.1041

2.4426

TABLE 8—Details of Sealant 7.

15 9c – Elongation cycles

1 Pail 25 9c Oxime

Average

values

Standard deviations

Fatigue cycles Stress (s’ 10 9c, kPa

0

36 500

0

36 5(X)

Stress ft? 25 9c, kPa

29.049

2.3.667

3.9744

3.8433

Stress ft? 50 9c, к Pa

38.502

36.363

5.2785

6.4101

Stress ft? 100 %, к Pa

50.646

47.679

3.6225

5.4579

Max stress, kPa

49.404

47.61

12.8409

14.6073

Max 9c strain

105.57

97.98

50.287?

52.5504

TABLE 9—Details of Sealant 8.

1 Part 50 % Alkoxy

15 % Elongation cycles, 1873-164

Average values

Standard deviations

Fatigue cycles

0

36 500

0

36 500

Stress @ 10 %, kPa

17.733

12.558

0.6003

0.05382

Stress @ 25 %, kPa

30.774

25.185

0.7866

0.18906

Stress @ 50 %, kPa

46.575

40.572

0.7383

0.33327

Stress @ 100 %, kPa

75.003

66.4746

0.4347

0.7038

Max stress, kPa

124.959

110.262

1.587

5.175

Max % strain

189.957

179.814

10.764

11.523

TABLE 10—Details of Sealant 9.

15 % Elongation cycles

1 Part 50 % Alkoxy

Average values

Standard deviations

Fatigue cycles Stress @ 10 %, kPa

0

36 500

0

36 500

Stress @ 25 %, kPa

17.388

14.421

1.1799

0.9039

Stress @ 50 %, kPa

26.979

25.116

1.6077

0.621

Stress @ 100 %, kPa

44.091

42.504

2.4357

1.3248

Max stress, kPa

89.079

97.014

8.2317

7.038

Max l7c strain

220.11

272.55

37.6188

37.6671

Conclusions

(1) The standard deviations of the fatigued samples are larger than the nonfatigued samples which is indicative of the degradation seen in the fatigued sample sets.

(2) The sealants with higher movement capability show less susceptibility to degradation than the lower movement sealants when strained to 15 %,

(3) The test method can differentiate between similar sealants. The test method is discriminatory enough to show significant degradation of the 12.5 % movement sealants when strained to a movement beyond which they are expected to endure.

(4) The tested SS (when not strained in shear beyond their movement capacity) experience degrada­tion. The degradation is small enough that shear rupture of the sealant due to fatigue is not probable.

(5) A reduction in modulus of the sealant was observed in each case after undergoing fatigue.