Abstract
In this research, the synergetic effect of a super-absorbent polymer in combination with a calcium nitrite corrosion inhibitor were evaluated as a combined technology to improve concrete durability in High Performance Concrete. For this purpose, Portland cement mortars with a water/cement ratio of 0.4 and a substitution of 9.5% of cement by silica fume were produced. The effect of this technologies was evaluated by measuring the following parameters: autogenous and drying shrinkage, surface electrical resistivity and the non-steady-state chloride migration coefficient. The results indicate that the synergistic effect of SAP + CNI improves autogenous shrinkage and surface electrical resistivity.
Highlights
It is well known that high performance concrete (HPC) has better mechanical and durability properties than conventional concrete (Zhutovsky S. et al, 2012)
This behaviour is attributed mainly to the increase in the water/cementitious ratio that could result during the very early ages, because it is considered that superabsorbent polymer (SAP) does not effectively retain all calculated internal curing water, liberating part of it in a period comprised between the time when the specimens were casted and the time when the concrete reach its final setting time
Results of surface electrical resistivity indicate that SAP has the most detrimental effect in terms of durability
Summary
It is well known that high performance concrete (HPC) has better mechanical and durability properties than conventional concrete (Zhutovsky S. et al, 2012). In HPC, supplementary cementitious materials (SCM), such as silica fume (SF) are commonly used to achieve a superior performance in terms of mechanical and durability performance (Lothenbach B. et al, 2011). Despite these benefits, the presence of silica fume in HPC could adversely originate early age cracking attributed to the hydration process In the presence of CNI, concrete setting times could be delayed Quraishi, et al, 2016; Hansson C.M. et al, 1998), but in this work we are expecting that the presence of SF could counteract this delay.
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