Abstract
In order to reduce the economic cost of high-water-content materials used in mine filling and improve the resource utilization rate of furnace slag and silica fume, furnace slag and silica fume were mixed into high-water-content materials by the admixture method. The variation law of compressive strength, hydration mechanism and microstructure were analyzed. When the furnace slag content is 10%, the compressive strength of high-water-content materials modified with furnace slag is consistent with that of pure high-water-content materials. When the silica fume content is 10% and 20% respectively, the compressive strength of high-water-content materials modified with silica fume increases by 8.54% and 3.66% respectively compared with pure high-water-content materials. When the furnace slag content is 30%, SiO2 in slag snatches Ca2+ and OH—from the solution to form a large amount of c-s-h gel, and the insufficient Ca2+ greatly hinders the formation of AFt crystals. When the silica fume content is 40%, the diffraction peak of AFt crystals cannot be observed in the diffraction pattern, which further indicates that the content of AFt crystals is an important factor affecting the compressive strength of high-water-content materials. When the content of slag and silica fume is low, AFt crystals are mostly in fine needle shape, the overall structure is uniform and dense. When the content of furnace slag and silica fume is high, AFt crystals are mostly of coarse columnar shape, and the overlapping mode becomes sparse and chaotic, and the dense degree of structure is seriously reduced.
Highlights
High-water-content materials are a major breakthrough of concrete materials, which have various properties compared with ordinary concrete, and have the characteristics such as high water content and quick setting that ordinary concrete does not have
1) When the furnace slag content is 10%, the compressive strength of the furnace slag modified high-water-content materials is consistent with the compressive strength of the pure high-water materials; when the silica fume content reaches 10% and 20%, compared with pure high-water-content materials, the compressive strength of the silica fume modified high-water-content materials increases by 8.54% and 3.66%, respectively
2) When the mixed dosage is small, the compressive strength of silica fume modified high-water-content materials can achieve the most ideal effect; Under the condition of large mixed dosage, the furnace slag and silica fume modified high-water-content materials can achieve the most ideal effect, which indicates that furnace slag and silica fume can be incorporated into high-water-content materials
Summary
High-water-content materials are a major breakthrough of concrete materials, which have various properties compared with ordinary concrete, and have the characteristics such as high water content and quick setting that ordinary concrete does not have. High-water-content materials can be mixed with nine times the volume of water to form a hardened body with a certain strength in 30 min[1]. Due to the advantages of high-water content, high strength in the early stage, fast coagulation speed and simple manufacturing process, high-water-content materials have been widely used in roadway support and goaf filling of mining engineering and leaking stoppage and foundation reinforcement of underground engineering. The research and development of high-water-content materials are a major technological breakthrough in mining engineering and have good social and economic benefits. There are still some problems in the actual engineering application of high-water-content materials. Furnace slag and silica fume were mixed into high-water-content materials to explore the effect of furnace slag and silica fume on the compressive strength of high-water-content materials, and the hydration mechanism analysis and microstructure analysis of furnace slag and silica fume modified high-water-content materials were carried out
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