Page 121 - ICJ Jan 2023

TECHNICAL PAPER COLLECTOR’S EDITION

Table 8. Properties of RGA concrete formed Cube strength, N/ ISA-
E,
from a variety of glass types Mix mm 2 kN/ 10
ml/
Cube strength, N/ E, ISA- 3d 7d 28d 90d mm 2 m /s
2
10
Mix mm 2 kN/ 2 ml/ (b) Flat glass
2
3d 7d 28d 90d mm m /s
Building 29 38 50 54 30 0.37
Control 28 36.5 49 55 30 0.47
Automobile 28 36 49 54.5 30 0.49
(a) Container Glass
(c) Borosilicate 29.5 34.5 44 55 29 0.45
Amber 28.5 36 50 58.5 32 0.43
26.0 33.0 44.5 50.0 30.0
Green 28 36 50.5 57 31 0.36 (d) Combinations / / / / / 0.34 /
29.5 36.5 48.5 56.5 36.0 0.47
Flint 28.5 34 46 55 30 0.41
Recycled glass aggregates (RGA) have significant
potential for use as a fine aggregate in concrete,
including high performance concrete. Research
has shown that concrete made with RGA as fine
aggregate will develop similar or slightly better
strength and modulus of elasticity than concrete
made with natural sand of the same grading (Table
8) and that flexural strength, creep and shrinkage
are essentially unaffected. RGA also has potential
for use as a filler aggregate (Figure 7) in increasing
strength and stiffness of concrete. Much recent
research has focussed on concerns with potential
alkali-silica reaction and means of minimising this
reaction. 42, 43

122 The Indian Concrete Journal | November 2018