Mechanical property and mechanism of salt rock enhanced by lime and silica fume

• Published in: Arabian journal of geosciences Vol. 15; no. 17
• Main Authors: Gao, Jiangping, He, Yuan, Cui, Xiangdong
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-09-2022; Springer Nature B.V
• Subjects: Climate change; Compressive strength; Design; Earth and Environmental Science; Earth science; Earth Sciences; Fruits; Human factors; Lime; Mechanical properties; Original Paper; Road engineering; Rocks; Salt lakes; Silica; Silica fume; Subgrades; Tensile strength; Lime; Salt rock; Stabilization mechanism; Mechanical property; Silica fume
• ISSN: 1866-7511; 1866-7538
• DOI: 10.1007/s12517-022-10754-7

In recent years, with the influence of climate change and human factors, salt rock (SR) subgrade diseases in Salt Lake area occur frequently. In order to improve the mechanical properties of SR, this paper adopts the mixed design test method of single lime (0%, 4%, 6%, 8%, 10%) and compound lime (4%, 6%, 8%, 10%) and silica fume (SF) (3%, 5%, 7%, 9%). Using standard compaction test, unconfined compressive strength (UCS) test, and splitting tensile strength (STS) test, this paper analyzes the influence of single lime and compound lime and SF on the strength of SR and explains the mechanism with the help of microscopic means. The results show that the UCS at 7d and the STS at 180d reach the maximum when adding 8% lime alone; mixed with lime 6% and SF 9%, the UCS of SR is up to 6.5 MPa; mixed with 8% lime and 7% SF, the maximum STS of 180d is 52.5 MPa. It is feasible to stabilize SR with 6% lime and 9% SF. These research results provide reference for the improvement of subgrade filling materials in Salt Lake area and can give guidance for the design and construction of road engineering, which is of great significance.