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Table 7 Results of 2nd series of four-point bending experiments concerning the kiln-cast beams

From: Investigating the flexural strength of recycled cast glass

2nd four-point bending experiment: Kilncast glass beams \(30\times 30\times 240\) mm, 100/200 mm supports

Glass type

Specimen description

Forming temperature (\(^{\circ }\hbox {C}\))

No. of tested specimens

Flexural strength (MPa)

Average flexural strength (MPa)

Average E modulus (GPa), LVDT calculation\(^\mathrm{a}\)

Minimum

Maximum

Soda lime silica (float glass)

Fully tempered float

1120

6

33.5

50.8

43.7

59.3

Float 10 mm, 3 horizontal layers

970

2

41.1

49.9

45.5

59.7

Float 10 mm, 24 vertical layers

970

3

27.9

37.7

33.3

58.6

Float dark blue

1120

3

60.7

65.7

62.9

62.3

Soda lime silica (float glass) with contamination

Float combo

1120

1

46.5

61.8

Oven doors

1120

3

29.9

43.8

37.5

58.3

Car windshields

1120

3

35.2

45.9

41.1

59.8

Float with black enamel, 60 layers

1120

3

36.4

50.1

41.7

60.7

Modified soda lime

Poesia standard cast brick

1070

3

61.3

72.1

66.5

61.1

Borosilicate

DURAN tubes

1120

5

30

50

42.5

52.4

DURAN rods \(\times \) 10 vertical

1120

3

34.3

50.6

44.1

53

DURAN rods \(\times \) 10 vertical

1070

3

24.5

36.7

30

50.9

DURAN rods \(\times \) 10 vertical

970

3

10.1

15.9

12.4

36.9

DURAN 24 mm rods, honeycomb

970

1

19.4

41

Borosilicate mix Coolrec

1120

1

66.9

59.2

Wertheim (C-glass)

Wertheim pellets

820

3

41.3

61.1

52.2

62.6

Wertheim pellets

900

1

63.4

64.6

Barium–strontium silicate

Barium CRT front panel

870

3

42.4

56.1

51.2

58

Potash–lead silicate

Lead CRT funnel

870

1

33.3

56.1

Lead glass

820

2

32.5

38.1

35.3

49.8

  1. \(^\mathrm{a}\)The LVDT calculation results in a lower than expected Young’s modulus by approximately 15%, due to sensor errors. The provided Young’s modulus data are only for comparison between the different glass types