Pozzolanic activity quantification of hollow glass microspheres

Abstract

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 with gas, providing a low-density material with high strength. The present study aims to characterize the interaction between HGMS and the cement paste, focusing mainly on the development of the pozzolanic activity, given the nature of amorphous silica. Therefore, two HGMS of different crush strength levels were studied. HGMS were used as a replacement of total cementitious binder at 10% by weight of cement. The pozzolanic activity was measured within the modified Chapelle test, the portlandite quantification from thermogravimetric analysis, and the strength activity index. Additionally, isothermal calorimetry analysis, X-ray diffraction patterns and scanning electron microscopy images were obtained. Results demonstrated that HGMS interact with the cement paste initially as nucleation agents and later with a pozzolanic reaction, presenting an activity comparable to that of metakaolin or fly ash.

A new simplified method for calculating short-term and long-term consolidation settlements of multi-layered soils considering creep limit

“…Hence, it is envisaged that the HGM with vitreous structure would exert a high pozzolanic reaction in the cementitious matrix. This result is consistent with a recent study [57]. Compared with the HGM, per gram of LWA could react with a much smaller amount of Ca(OH) 2 (605 mg).…”

Performance of concrete containing recycled masks used for personal protection during SARS-CoV-2 coronavirus pandemic

“…5 also shows that the heat release curves of the RP and FP cement pastes are very similar, during the time of the experiment. Since the cement hydration process can be directly assessed from the mentioned heat fl ow and heat release curves (29)(30)(31), it can be concluded from the obtained results that the inclusion of 0.42 g of the processed mask fi bres 50 cm 3 of the cement pastes, did not affect the hydration process of cement.…”

Performance of lightweight cement pastes under CO2 storage conditions

“…HGMS are widely used for oil well cementing with the ability to reduce the specific weight of the cement paste without severely affecting its hardened properties [12]. In previous research, the chemical interaction between HGMS and cement hydration product was already proven [13]. However, there is not much research regarding the influence of HGMS on the durability of lightweight cement paste subjected to CO2 injection wells.…”