Abstract
In order to explore the effect of composite materials on the mechanical properties of coastal cement soil, cement soil samples with different iron tailings and nano silica contents were prepared, and unconfined compression and scanning electron microscope tests were carried out. The results show that: (1) The compressive strength of cement soil containing a small amount of iron tailings is improved, and the optimum content of iron tailings is 20%. (2) Nano silica can significantly improve the mechanical properties of iron tailings and cement soil (TCS). When the content of nano silica is 0.5%, 1.5%, and 2.5%, the unconfined compressive strength of nano silica- and iron tailings-modified cement soil (STCS) is 24%, 137%, and 323% higher than TCS, respectively. (3) Nano silica can promote the hydration reaction of cement and promote the cement hydration products to adhere to clay particles to form a relatively stable structure. At the same time, nano silica can fill the pores in TCS and improve the compactness of STCS.
Highlights
Note: In silica- and iron tailings-modified cement soil (STCS)-Y-Z, Y represents the content of nano silica, Z represents the content of iron tailings, and the X represents the optimal content
When the iron tailing content continued to increase, the unconfined compressive strength of tailings and cement soil (TCS) began to decrease, and the iron to increase, the unconfined compressive strength of TCS began to decrease, and the iron tailings began to show a deterioration effect, which gradually increased with the increase tailings began to show a deterioration effect, which gradually increased with the increase in the iron tailing content
The mechanical properties and micro mechanism of TCS and STCs at 7d curing age were studied by unconfined compressive strength test and SEM test
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Yao et al studied effect of nano-MgO on the mechanical performance of cement-stabilized silty clay [26] It has been found through various studies that nanomaterials can fully exert their own activity in cement-based materials, promote the process of cement hydration reaction, and fully fill the internal pores of cement-based materials at the microscopic scale, achieving the purpose of improving the engineering properties of cement-based materials. Due to its unique physical properties, nano silica has recently been widely used in geotechnical engineering, for example, in modified calcareous sand in the South China Sea [31] and in stabilized coastal silty clay [32]. The optimal iron tailing content was explored through unconfined compressive tests, the modification effect of nano silica on TCS was studied, and the strength growth mechanism of STCS was analyzed in combination with microscopic tests
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