Physical and Chemical Properties of Nano-slag Mixed Mortar

Abstract

As buildings have become higher and larger, the use of high performance concrete has increased. With this increase, interest in and use of ultra fine powder admixture is also on the rise. The silica fume and BSF are the admixtures currently being used in Korea. However, silica fume is exclusively import dependent because it is not produced in Korea. In the case of BFS, it greatly improves concrete fluidity and long-term strength. But a problem exists in securing early strength. Furthermore, air-cooled slag is being discarded, buried in landfills, or used as road bed materials because of its low activation energy. Therefore, we investigated in this study the usability of nano-slag (both rapidly-chilled and air-cooled) as an alternative material to the silica fume. We conducted a physic-chemical analysis for the nano-slag powder and performed a mortar test to propose quality standards. The analysis and testing were done to find out the industrial usefulness of the BFS that has been grinded to the nano-level.

Influence of Curing Time on the Drying Shrinkage of Concretes with Different Binders and Water-to-Binder Ratios

“…This is especially the case for fly ash concrete, whose increments of early and total drying shrinkage are much larger than those of plain cement concrete due to the reduction of the wet curing time. The existing research results show that SGGBS improves reaction activity at the early and middle ages and has better resistance to capillary suction, which can decrease the drying shrinkage and improve the compactness and durability of concrete [55][56][57][58][59]. Therefore, replacing part of GGBS or fly ash with SGGBS (SGGBS-GGBS concrete or SGGBS-fly ash concrete) may be an effective way to reduce the drying shrinkage of concrete with mineral admixtures.…”

Influence of Micro/Nano Sized Fly Ash on the Properties of Cement Mortar

“…Hence the conclusion was that workability and consistency of mortar do not improve by the blending of fly ash in all cases. One of the major contributions of many significant works viz [2], [3], [4], [5], [6] states microstructure study, mechanical properties and durability properties of concrete are dependent on fine particles such as nano particles of SiO2, TiO2, Al2O3, Fe2O3, salg and fly ash as partial replacement with cement. Partial distribution of micro/ nano in cement paste and mortar is studied in the current research work.…”