煤基固废制备充填材料配比优化试验研究

Study on proportion optimization of coal-based solid wastes filling materials

  • 摘要: 为制备低成本、高强度的煤矿充填材料,以煤矸石做骨料,以粉煤灰、脱硫石膏、硅钙渣为 胶凝材料制作试件,并对其进行单轴抗压强度、坍落度、扩展度指标测试,研究了充填材料配比优 化前后的力学性能、各组分影响情况。 结果表明,脱硫石膏、硅钙渣在一定掺量范围内具有较强 的胶凝作用;随着粉煤灰掺量增加,充填材料初期强度增长较慢,应控制其掺量不高于6.67%;粉 煤灰与硅钙渣联合使用能激发硅钙渣的胶凝性能;煤矸石、粉煤灰、脱硫石膏、硅钙渣、水泥最优 质量比为70:6:3:12.5;8.5。 利用响应面法对结论进行了验证,试验结论与预测一致。

     

    Abstract: The aim of this study is to prepare a low cost and high strength filling material.Coal gangue is aggregate.Fly ash,desulfurization gypsum and silicium-calcium slag are cementing materials.The uniaxial compressive strength , slump and slump flow of the specimen were measured to investigate the mechanical properties and the influence of each component.The result shows that desulphurization gypsum content and silicium-calcium slag have a strong gelation effect in certain amount range.With the increase of content of fly ash , the initial strength of filling material increases slowly.The content of fly ash should be controlled less than 6.67%.The mixing of fly ash and silicium-calcium slag could activate cementious properties of silicium-calcium slag performance.The optimum mass ratios of coal gangue,fly ash,desulfurization gypsum,silicium-calcium slag and cement are70:6:3:12.5:8.5.The conclusion is verified by response surface method,and the experimental results are consistent with the prediction.

     

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