Abstract
Rubber concrete has high environmental and economic benefits. However, the difference in the physical and chemical properties of the interface causes a weak interface between rubber and concrete, which limits the use of rubber concrete to a certain extent. Based on the macroexperiment of epoxy resin (EP) modified rubber concrete, from the nanoscale level, three interface models of Rh (natural rubber)/C‐S‐H, EP/C‐S‐H, and Rh/EP/C‐S‐H were constructed by molecular dynamics simulation to explore the interaction between epoxy resin and rubber cement‐based interface and reveal its microreinforcement mechanism. The results of interaction energy, radial distribution function, and mean square displacement show that the addition of EP not only improves the interface interaction energy between Rh and C‐S‐H but also provides a large number of hydrogen bond donors and receptors, promotes the diffusion of Ca, and increases the adhesion between Rh and cement matrix. The results of the analysis of mechanical properties show that the elastic modulus of the rubber concrete interface model is improved and the interface properties are improved after adding EP.
Highlights
With the continuous development of industries in various countries, the contradiction between the shortage of natural resources and the rapid development of society is becoming increasingly fierce. e low carbon green development and the utilization of waste resources will become the rigid requirements of social sustainable development
After the waste rubber aggregate is added to the concrete, it will affect the cement hydration reaction of the concrete and form many weak interface transition zones in the new composite material composed of nonpolar rigid bodies and organic elastomers. e weak interface problem usually leads to the early failure of the composite material. is has seriously hindered the development and application of rubber concrete (Figure 2)
According to the energy calculation of the three interface models under the same conditions, the interaction energy reflects the interaction between the inorganic phase and the organic phase [27]. e binding energy is an important standard to evaluate the adhesion and miscibility between Calcium silicate hydrate (C-S-H) and polymer and an important index to measure the adsorption strength in the adsorption process, which is contrary to the interaction energy [28, 29]. e greater the absolute value, the stronger the interaction force. e calculation formula of Einter is shown in the following formula: Einter Etotal −Esurface + Epolymer −Ebind, (1)
Summary
With the continuous development of industries in various countries, the contradiction between the shortage of natural resources and the rapid development of society is becoming increasingly fierce. e low carbon green development and the utilization of waste resources will become the rigid requirements of social sustainable development. The waste rubber is not easy to degrade naturally, and direct landfill is easy to cause soil pollution. Erefore, the disposal of solid waste from waste tires has become a serious global social problem (Figure 1). Compared with ordinary plain concrete, it can improve the mechanical properties of concrete and solve the problem of difficulty in treatment of waste tires. After the waste rubber aggregate is added to the concrete, it will affect the cement hydration reaction of the concrete and form many weak interface transition zones in the new composite material composed of nonpolar rigid bodies and organic elastomers. Is has seriously hindered the development and application of rubber concrete (Figure 2). EP rubber elastic concrete combines the advantages of the above two materials and has broad application prospects
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