Page 187 - New Trends in Eco efficient and Recycled Concrete

Recycling of waste glass in construction materials 159

Figure 6.4 Eco-block paving units in Hong Kong.
Source: Tiostone Environmental Ltd.

90 Requirement of footpaths (30 MPa) 2.39
(A) (B) 5.1
80 Requirement of carriageways (45 MPa)
2.38
4.8
70 2.37 4.5
Compressive strength (MPa) 50 Density (g/cm 3 ) 2.36 Density (SSD) 4.2 Water absorption(%)
60
40
2.35
3.9
30
2.34
20
2.33 Water absorption 3.6
3.3
10
0 2.32 3.0
0%GC 10%GC 25%GC 40%GC 55%GC 55%GC+10%GP 0%GC 10%GC 25%GC 40%GC 55%GC 55%GC+10%GP
Figure 6.5 Effect of glass cullet contents on the properties of paving blocks. (A)
Compressive strength; (B) Density and water absorption.
Fig. 6.5B shows the density and water absorption results of the paving blocks,
which indicate that both the density and water absorption were reduced with the
increase of GC content in the paving blocks. The addition of GP can further result
in a reduction of the density and water absorption. According to the Hong Kong
General Specifications for Grade A paving blocks for pedestrian areas, the water