Chloride ion permeability of SBR-modified

Table 4.3 Effect of Latex Particle Size on Chloride Ion Permeability of SBR-Modified Mortars with a Polymer-Cement Ratio of 15% by ASTM C 1202.

The molecular weight, glass transition temperature (T) and size of dispersed polymer particles in the latexes can affect the strength and c loride ion permeability of latex-modified mortar and concrete to a certain extent [87,93] (Tables 6.11 and 6.12). SBR latexes with smaller particle size appear to initially provide lower chloride ion permeability to the mortars, but a difference in the permeability between the smaller and larger particle sizes eventually becomes insignificant as the concrete ages. The initial decrease in the permeability observed with smaller particles is attributed to the fact that smaller particle size coalesce into films faster than the larger particle sizes. 

---