Iranian Journal of Materials Science and Engineering

The  current  research  aims  to  investigate  alkali-activated  fly  ash  (AAFA)  concrete/mortar  modified  with
granulated ground blast-furnace slag (slag). FA was partially replaced with slag at levels of 0, 5, 10 and 15%, by
weight. The workability and mechanical properties of alkali-activated concretes were studied. Drying shrinkages of
alkali-activated mortars were investigated. All results of alkali-activated FA/slag concretes/mortars were compared to
control  concretes/mortars  based  on  plain AAFA.  The  results  indicated  that  the  workability  decreased  as  the  slag
content increased. Mechanical strengths and drying shrinkages increased with increasing slag content

In the current work, the properties of cement pastes doped with high amounts of ground granulated blast-furnace slag (HVS) were investigated. Portland cement (PC) was substituted with ground granulated blast-furnace slag (donated as slag) at very high amounts of 85%, 90%, 95% and 100%, by weight. PC paste without any content of slag was used as a reference. Some fresh and hardened properties such as workability, density, compressive strength up to 56 days, pH value and drying shrinkage up to 200 days were measured. The various phases formed were identified using X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The microstructure of the formed hydration products was determined by scanning electron microscopy (SEM). The results indicated that HVS has higher workability and higher drying shrinkage beyond 60 days. On the other hand, HVS has lower pH, density and compressive strength.