Abstract
Diatomite has gained more and more interest as a new resource, since it has potential as a favorable alternative to mineral filler in the construction of asphalt pavement compared with ordinary limestone powder. In this paper, the mechanical and anti-deformation properties of sand asphalt composites with various proportions of diatomite were investigated by a uniaxial compression failure test, a uniaxial compression repeated creep test, and a low-temperature splitting test in order to determine the optimal replacement content of ordinary limestone powder. Five groups of sand asphalts with various volume ratios of diatomite to limestone (0:1, 0.25:0.75, 0.5:0.5, 0.75:0.25, and 1:0) were determined by the simplex-lattice mixture design (SLD) method. The results reveal that the compression strength, anti-deformation properties, and low-temperature crack resistance of sand asphalts are improved through the use of diatomite. Furthermore, the optimal ratio (0.327:0.673) of limestone to diatomite is determined by the SLD method, according to secant modulus and creep strain results.
Highlights
In recent years, the exhaustion of non-renewable energy and environment pollution has caused many problems for people; people urgently need to find new resources to replace traditional resources
Guo et al [5] studied the properties of a diatomite-glass fiber modified mixture, and indicated that diatomite had a significant effect on the stiffness modulus of the asphalt mixture; the compound modified mixture had an improved traveling performance compared with the control mixture
The aim of this study was to investigate the effects of diatomite on the mechanical and anti-deformation properties of sand asphalt, as well as the optimal diatomite content determination as an alternative mineral additive based on these properties
Summary
The exhaustion of non-renewable energy and environment pollution has caused many problems for people; people urgently need to find new resources to replace traditional resources. Cheng et al [10] suggested that the specific surface area was the most influential factor of mineral fillers on the properties of asphalt mastic in comparison with density, particle size distribution, and hydrophilic coefficient, and diatomite asphalt mastic performed better than limestone asphalt mastic, hydrated lime asphalt mastic, and fly-ash asphalt mastic. It could be concluded from the aforementioned studies that diatomite was potentially a beneficial filler in the construction of asphalt pavements
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