Civil Engineering Reference
In-Depth Information
5E-11
Concrete content 350 kg/m
3
4E-11
w/C = 0.4
w/C = 0.3
3E-11
2E-11
1E-11
0
7
14
28
56
7
14
28
56
Age (days)
Moist-curing
Self-curing
Air-curing
9E-12
8E-12
7E-12
6E-12
5E-12
4E-12
3E-12
2E-12
1E-12
0
Concrete content 450 kg/m
3
w/C = 0.4
w/C = 0.3
7
14
28
56
7
14
28
56
Age (days)
Moist-curing
Self-curing
Air-curing
16.4
water permeability coefficient vs. time for self-curing and
traditional mixes (El-Dieb, 2007).
Standard cement concrete is a brittle material: the addition of polymer in the
mix improves to some extent its flexibility (Wang et al., 2012).
Polymeric latex consists of very small polymer particles (0.05-5 mm)
dispersed in water and are generally formed by polymerization in emulsion.
Different polymers (i.e. thermoplastics, thermosettings and elastomers) can
be incorporated also in other forms than latex: re-dispersible powder, water-
soluble polymers or resins (Chung, 2004; Cestari et al., 2008). The content
of polymer (solid basis) used in typical PMC formulations is 10-25% wt of
cement.
The polymeric particles with a high molecular weight are held in dispersion
with the aid of surface active agents (such as polyvinyl alcohol or alkyl
