Abstract
In order to explore the physical characteristics and microstructure of mineral powder, and to conduct an in-depth study of the rheological properties of cement paste and the influence of mineral powder on the properties of cement paste, the physical characteristics, chemical composition and microstructure of different types of mineral powder were analyzed. Using different types of mineral powder with varying pass rates through a 0. 075 mm sieve, asphalt mortar with different dosages was prepared. The influence of dynamic shear rheology and bending beam rheology test on the rheological properties of asphalt cement paste at high and low temperatures was analyzed. Gray relational analysis was employed to explore the relationships between the physical parameters and microstructural characteristics of the mineral powder and the high and low-temperature performance of the asphalt mortar. The experimental results show that the five types of mineral powders have relatively few small pores. The pores of R3 and R4 mineral powders are predominantly elongated, while the pores of R1, R2 and R5 mineral powders are mostly formed by particle accumulation. With the increase of mineral powder content, the overall high-temperature performance and anti-flow ability of asphalt mortar improve, while the low-temperature performance first weakens and then strengthens. Taking specific surface area and other indicators as comparison series and phase angle as reference series, the grey relational analysis method is used to determine that oxide content has the greatest influence on high temperature performance and the specific surface area of mineral powder has the least influence. At low temperature, the particle size of mineral powder has the greatest influence on creep stiffness, and the average pore diameter has the greatest influence on the change rate of creep stiffness. The control of mineral powder index and the change of high and low temperature characteristics can provide references for practical engineering applications.
| Translated title of the contribution | Microscopic characteristics of mineral powder and gray analysis of its rheological properties with asphalt mortar |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 1-14 |
| Number of pages | 14 |
| Journal | Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology |
| Volume | 56 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2024 |
| Externally published | Yes |
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