防灭火水泥基泡沫的凝结特性测试新方法及应用

发布时间：2018-04-23 18:38

本文选题：防灭火 + 水泥基泡沫　；参考：《材料科学与工程学报》2017年06期

【摘要】：水泥基泡沫流体具有良好的裂隙渗流、向上堆积性,且在凝结固化后拥有优越的隔热能力,已成为防治煤自燃的主要技术支撑材料。其在高温煤岩裂隙中的渗流扩散形态、现浇施工中灌注量、灌注范围的界定很大程度上取决于其凝结特征。针对目前关于水泥基泡沫流体凝结特性测试方法的不足,本研究对水泥基泡沫流体凝结过程水化产物进行微观分析,得出泡沫流体凝结过程为泡沫壁凝结,稳定性增强,结构不易变形,单个泡沫体流动阻力加大,流动困难的工作机理;进而提出了一种失去流动时间(Loss fluidity time,LFT)指标,用于表征水泥基泡沫流体的凝结特性,并发明了相应的测试装置及方法。实验研究了防灭火用水泥基泡沫的LFT和水基泡沫掺量(1V,2V,……7V)、促凝剂种类(AC1、AC2、AC3、AC4)、促凝剂掺量(3wt.%、5wt.%、7wt.%,……15wt.%)之间的关系,得出了采用5次多项式描述凝结时间与水基泡沫添加量及促凝剂浓度之间的耦合规律,并根据现场灭火工程要求,优选出促凝剂种类为AC3。
[Abstract]:Cement-based foam fluid with good fracture seepage upward accumulation and excellent thermal insulation after solidification has become the main technical support material to prevent coal spontaneous combustion. The percolation and diffusion pattern in high-temperature coal fissure, the quantity of pouring in cast-in-situ construction, and the definition of the scope of grouting depend to a great extent on its condensation characteristics. In view of the deficiency of the present testing methods on the condensation characteristics of cement-based foam fluids, the microcosmic analysis of the hydration products of the cement-based foam fluids is carried out, and the results show that the condensation process of the foam fluids is the condensation of the foam wall and the stability is enhanced. The structure is not easily deformed, the flow resistance of a single foam is increased and the flow is difficult, and a loss of flow time (loss fluidity time) index is proposed to characterize the condensation characteristics of cement-based foam fluid. The corresponding testing device and method are also invented. The relationship between the LFT of cement based foam for fire prevention and water base foam, the content of water based foam, the type of accelerator, the type of accelerator, the amount of accelerant, the dosage of accelerant and the quantity of coagulant, are studied experimentally, and the results are as follows: (1) the relationship between the content of cement based foam for fire prevention and the amount of cement based foam (1 V / 2 V / V), the type of procoagulant / accelerator, and the dosage of coagulant / accelerator are studied. The coupling law between setting time and the amount of water based foam and the concentration of coagulant was obtained by using the 5th order polynomial. According to the requirements of field fire extinguishing engineering, the type of coagulant promoter was selected as AC3.
【作者单位】：湖南科技大学资源环境与安全工程学院;煤矿安全开采湖南省重点实验室;
【基金】：国家自然科学基金青年科学基金项目(51604110,51774135,51504093,51374003) 湖南省自然科学基金青年科学基金项目(2017JJ3074) 中国博士后基金面上项目(2017M612558) 湖南省教育厅一般科研项目(17C0641)
【分类号】：TU528

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