Study of the Self-Healing Performance of Semi-Flexible Pavement Materials Grouted with Engineered Cementitious Composites Mortar based on a Non-Standard Test

Abstract

Semi-flexible pavement (SFP) materials, with their characteristics of good high temperature stability, strong durability, and lower cost, are suitable for heavy-duty roads, but their cracking problem has hindered the development and popularization of this kind of pavement to a certain extent. In this study, engineered cementitious composites (ECC) were used to form ECC-SFP materials. The self-healing properties of ECC-SFP materials with three kinds of voids of matrix asphalt mixtures were studied. The test results showed that the fluidity and strength of the ECC mortars met the specification requirements when the water–cement ratio was 0.23 and the ECC fiber dosage was 1–2%. The flexural strength of ECC mortar is better than that of ordinary mortar. The higher the ECC fiber dosage, the higher the flexural strength. Increasing the void of the matrix asphalt mixture and the amount of ECC mortar increased the toughness of the ECC-SFP material, which was seen as an increase of the flow value. Curing conditions are key factor affecting the self-healing properties of ECC mortar and ECC-SFP materials. The self-healing effect of materials in 60 °C water is the best. When an ECC fiber dosage of 1% was used, the HImor of ECC mortar and HImix of ECC-SFP material were 27.5% and 24.8%, respectively. With the addition of ECC material, ECC-SFP material achieved a certain degree of self-healing, but this still needs to be further optimized. Studies of grouting process optimization and increasing the ECC fiber dosage are feasible directions to explore in order to improve the self-healing properties of ECC-SFP materials in the future.

Sustainable Designed Pavement Materials

“…They concluded that rejuvenators can soften aged pavement materials and consequently recover the road performance. Furthermore, self-healing characteristics of pavement materials were reported by Wu et al [13], Li et al [14], and Cai et al [15]. Wu et al [13] found that UV irradiation will weaken the macro-structure and lower the failure strength and healing index.…”

“…Wu et al [13] found that UV irradiation will weaken the macro-structure and lower the failure strength and healing index. Li et al [14] designed steel fiber modified asphalt concrete to promote the induction heating technology, while Cai et al [15] used engineered cementitious composites mortar to prepare flexible pavement materials with certain healing property. Numerical simulation models of microwave heating of asphalt mixture, which can be used for pavement maintenance, recycling, and deicing, were developed with finite element software by Wang et al [16].…”

Study of the Effect of Grouting Material Strength on Semiflexible Pavement Material

“…Te results showed that the fatigue resistance of the SFP material was signifcantly lower than that of AC under low-temperature and high-stress ratio conditions, but the addition of grouting material was not shown to have a positive efect on the fatigue resistance of the SFP material in this experiment. Cai et al [23] delved into the efect of grouting material with a strength of 32 MPa and conventional grouting material on the cracking resistance of the SFP material by carrying out a three-point bending test and showed that the grouting material could increase the cracking resistance and deformation ability of the SFP material, while the grouting material with a strength of 32 MPa contributed better to improvements of the SFP material than conventional grouting material. Despite all the preliminary results on the linkage between the grouting material strength and the SFP material in this study, other properties of the material still need to be further investigated.…”

“…Te performance of the SFP materials can be improved by injecting grouting materials of diferent strengths, as indicated above, but there are still some issues that need to be addressed. Cai et al [22], Wang et al [6], Cai et al [23], and other scholars in their studies selected the grouting materials of single strengths, leading to a lack of comparability in the efects of diferent grouting material strengths on the SFP material performance. Te diference between the grouting material strengths chosen by Wang et al [25], Fang et al [28], and Imran Khan and Hartadi Sutanto [29] is not signifcant, and as a result, the improvements in the SFP material performance are not obvious, failing to obtain the substantial change pattern of the grouting material strength's infuence on the performance of SFP materials.…”

Study on the Adhesion Performance of Asphalt-Calcium Silicate Hydrate Gel Interface in Semi-Flexible Pavement Materials Based on Molecular Dynamics

“…However, asphalt pavement, as a viscoelastic material [ 1 , 2 , 3 ] suffers from long-term aging, rutting, fatigue cracking, and water erosion, which seriously affect its durability [ 4 , 5 , 6 , 7 , 8 ]. Compared with traditional asphalt pavement, semi-flexible pavement (SFP) has remarkable stiffness and durability and excellent pavement bearing capacity and rutting resistance [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”