Experimental studies on permeability and carbonation properties of ultra high toughness cementitious composites

The carbonation and permeability properties of ultra high toughness cementitious composites (UHTCC) were investigated through the rapid carbonation test with and without pre-loading, permeability, rapid chloride ions migration test and measurement of free chloride ions. The results show that the carbonation depth of UHTCC is equal to that of the controlled concrete, but the carbonation depth of UHTCC with pre-loading is only 30 %～40 % of the controlled concrete. The impermeability of UHTCC is superior to that of controlled concrete. The permeability coefficient of UHTCC decreases with age increasing, which is 35 % of the controlled concrete when the age was up to 56 days. Rapid chloride ions migration test and measurement of free chloride ions reveal that UHTCC is much better than the concrete in resisting chloride ions penetration.