Abstract
Many studies have used rubber as an additive to form a cement-matrix composite (rubcrete). However, rubcrete has a lower mechanical strength than standard concrete. To improve the properties of rubcrete, this study performed surface modifications on crumb rubber through a partial oxidization reaction. The optimal ratio of air to nitrogen was determined by experiments to be 1:4. Fourier transform infrared spectroscopy (FT-IR) was used to identify the functional groups on the surface of the crumb rubber. A colloidal probe of calcium silicate hydrate (C–S–H) was prepared, and the intermolecular interactions between the rubber and the C–S–H were measured using an atomic force microscope (AFM). The experimental results showed that the partially oxidized crumb rubber contained more hydrophilic S–O bonds. The intermolecular force between C–S–H and treated rubber increased by 23% compared to the force between the original rubber and C–S–H. The compressive strength of the hardened cement paste (56 days) with the treated crumb rubber increased 50% in comparison with that of the hardened cement paste with the as-received crumb rubber.
Highlights
A large number of waste tires are generated worldwide every year [1]
To prevent any effect from sand, rubberized cement pastes were were prepared to understand the effects of partial oxidation on the bonds between calcium silicate hydrate (C–S–H) moieties prepared to understand the effects of partial oxidation on the bonds between C–S–H moieties and the and the treated crumb rubber
The as-received crumb was analyzed by thermogravimetric analysis (TGA) under both nitrogen
Summary
A large number of waste tires are generated worldwide every year [1]. Tires are not biodegradable, the necessary periods for degradation are too long to be considered practically feasible. NaOH treatment enhanced the adhesion of tire rubber particles to the cement paste. The mechanical properties of rubcrete with the NaOH-treated rubber crumbs were improved over those treatment enhanced the adhesion of tire rubber particles to the cement paste. To improve the compressive strength of rubcrete [25,26], most studies have tried to modify the surface properties of the rubber particles for enhanced adhesion to calcium silicate hydrate (C–S–H). To prevent any effect from sand, rubberized cement pastes (instead of mortars) were were prepared to understand the effects of partial oxidation on the bonds between C–S–H moieties prepared to understand the effects of partial oxidation on the bonds between C–S–H moieties and the and the treated crumb rubber.
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