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寧 波

（ 陜西鐵路工程職業技術學院 ，陜西 渭南 714000)

摘 要 ：鐵尾礦長期堆積在尾礦庫造成資源浪費和環境破壞，研究鐵尾礦－鋼纖維混凝土力學性能對開發利用鐵尾礦具有重要意義。在混凝土中摻入鐵尾礦和鋼纖維，研究不同材料配比下混凝土的抗壓強度變化。結 果表明：鐵尾礦摻量過低，生成的膠狀聚合物較少 ，黏結作用較弱，鐵尾礦摻量過高會導致混凝土含水量過高， 均會降低混凝土抗壓強度；鋼纖維對混凝土抗壓強度具有提升作用；氫氧化鈉摻量與水膠比主要影響膠狀聚合物的形成，分布均勻、充足的膠狀聚合物可有效連接水泥基體和鋼纖維，增強混凝土抗壓強度 ；鐵尾礦－鋼纖維混凝土最優配比為鐵尾礦摻量40%、45mm長度鋼纖維體積摻量2%、氫氧化鈉摻量40%、水膠比0. 2。 關鍵詞：鐵尾礦；鋼纖維；混凝土；最佳配比；力學性能

中圖分類號：TU528 

文獻標志碼：A 

文章編號：1005- 8249 (2024) 03- 0016- 05 

DOI：10.19860/j.cnki.issn1005-8249.2024.03.004

NING Bo

(Shaanxi Railway Institute , Weinan 714000 , China)

Abstract : The long - term accumulation of iron tailings in tailings ponds causes resource waste and environmental damage. Studying the mechanical properties of iron tailings steel fiber concrete is of great significance for the development and utilization of iron tailings. Add iron tailings and steel fibers to concrete to study the changes in compressive strength of concrete under different material ratios. The results show that if the content of iron tailings is too low , less gel like polymers are generated and the bonding effect is weak. If the content of iron tailings is too high , it will lead to a high water content in the concrete , which will reduce the compressive strength of the concrete; Steel fibers have an enhancing effect on the compressive strength of concrete; The dosage of sodium hydroxide and the water cement ratio mainly affect the formation of gel like polymers. A uniformly distributed and sufficient gel like polymer can effectively connect the cement matrix and steel fibers , enhancing the compressive strength of concrete; The optimal ratio of iron tailings to steel fiber concrete is 40% for iron tailings , 2% for steel fiber volume of 45 mm length , 40% for sodium hydroxide , and 0. 2 for water cement ratio.

Keywords : iron tailings; steel fiber; concrete; optimum ratio; mechanical properties

*基金項目：陜西省教育廳專項科研計劃項目 (18JK0179) 

作者簡介：寧 波 (1979—) , 男，碩士，副教授，研究方向：混凝土材料及橋隧檢測方面工作。 

收稿日期：2023- 08- 13