Performance of resin–cement composite clad modified vitrified beads

Abstract

In this study, organic–inorganic composite modified vitrified beads were prepared with a water-based acrylic resin and cement as modifiers. The effects of the modified cladding on the performance of the vitrified beads were investigated by varying the amount of emulsion and the volume of the spray. The volume of the vitrified beads to be modified was maintained at 100 cm3 and the total amount of cement was maintained at 5.0 g. The results showed that, when the amount of emulsion is 3.0 mL and the volume of the spray is 15.0 mL, the bulk density of the vitrified beads increases by 28.5 kg/m3, the volume water absorption decreases from 39.7% to 3.5%, and the cylinder compressive strength increases by 218.0 kPa. Moreover, the thermal conductivity increases by only 0.0033 W/(m‧K), the degree of bonding is relatively low, and the comprehensive performance is optimal. On the surface of the modified vitrified beads, some of the cement seals the open hole, and the rest of it adheres to the undamaged surface, which is conducive to the improvement of the strength of the material. On the one hand, the resin can fill the pores of cement, and form a staggered organic–inorganic network with cement. Meanwhile, it forms an organic film on the surface of the cement and the glazed layer to play a hydrophobic and strengthening role. On the other hand, it acts as a binder between the cement and the glazed layer to reduce the shedding of cement in the process of material use.