710175.fig.0018a
(a)
710175.fig.0018b
(b)
710175.fig.0018c
(c)
710175.fig.0018d
(d)
Figure 18: Structure of cement-foam concrete: (a) without nanotubes, (b) with 0.05% CNT (pore walls), (c) without CNT (perforated), and (d) stabilized with addition of 0.05% CNT [113].