Department and Location
Research Name
Influence of nano waste materials on the mechanical properties, microstructure, and corrosion resistance of self-compacted concrete
Research Description
Recycling nano wastes materials (NWM) including nano waste glass (NWG) and nano waste
ceramic (NWC) as an eco-friendly alternative binder helps the reclamation of construction waste
and reduces the demand for cement. Considering that self-compacted concrete (SCC) which needs
high powder content has been largely used in building engineering due to its high flowability,
which allows it to self-compact and maintain homogeneity without separation, and thus,
substituting NWM for partial cement in preparing SCC is more sustainable. This paper explores
the effect of replacing cement in SCC with nanomaterials that were made in two ways. The first
way is the milling technique, where glass and ceramic wastes are converted to NWM to overcome
the problem of some wastes and the emission of CO2 during ordinary Portland cement
manufacturing. The second way Also, to compare the behavior, a chemically prepared NS by
precipitation technique was used. Several SCC mixes were made using nanomaterials as cement
replacement materials with replacing percent up to 5% and analyzed. Fresh properties, mechanical characteristics, microstructure, and corrosion rate of SCC mixes were studied. The
testing results revealed that SCC’s flowability, passing ability, and viscosity declined as the NS,
NWG, and NWC increased while being within the EFNARC-2005 recommended limit. Wastemilled nanomaterials are comparable to nano-silica, which is chemically prepared to improve
SCC mechanical properties and purify the microstructure; replacing cement with 3% NWG
increased compressive strength by 32.4%, while NWC and NS increased compressive strength by
17.3% and 26.4%, respectively. Replacing cement with nanomaterials decreases the anodic and
cathodic overpotentials and shifts the corrosion potential (Ecorr) of high-strength steel (HSS)
embedded in SCC specimens cured in 3.5% NaCl solution to preferable values, in addition to
reducing the current densities of corrosion (Icorr).
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