Pozzolanic activity quantification of hollow glass microspheres

Hollow glass microspheres (HGMS) have been widely used in the hydrocarbon industry for cementing wells with low-density slurries. These consist of amorphous siliceous hollow spheres filled gas, providing a material high compressive strength. The present study aims to characterize interaction between HGMS and cement paste, focusing mainly on development pozzolanic activity, given nature silica. Thus, two different crush strength were studied. as replacement total cementitious binder at 10% by weight cement. activity was measured modified Chapelle test, portlandite quantification thermogravimetric analysis, index comparing hardened paste samples. Additionally, isothermal calorimetry X-ray diffraction patterns scanning electron microscopy images obtained. Results demonstrated that interact initially nucleation agents later reaction, presenting an comparable metakaolin or fly ash.