This report presents the achievements of the 2012 first quarter focusing on the application of nS in concrete. In this context, one nano-silica precipitated from the olivine dissolution in acid (OnS) and one nano-silica sludge (nSS) were used for the experimental work on mortar scale. The activities performed include the study of the dispersibility behavior of OnS particles in water (viscosity of the dispersion and selection of stabilization agents). In addition, the effect of the nSS for cement replacement in self compacting mortars (SCM) was started. Furthermore, the pozzolanic index of OnS was determined and compared with a commercial micro-silica sample. Finally, changes in the
viscosity of the paste, caused by the volumetric substitution of cement, were studied using a concentric cylinder rheometer and serve as a preliminary test to study the effect of superplasticizer (SP) on nano-silica/cement based systems.
The aim of the aforementioned activities was to investigate the main characteristics and the behaviour of the olivine nano-silica and its interaction with the cement paste. These activities were based on the reported project plan. Some general conclusions and recommendations have been drawn from the results.
|Name||Quarterly Project Report|
|Volume||Q1 - 2012|