基于自修复效应的封孔材料裂隙自愈合特性  被引量:2

Self-healing characteristics of fracture in sealing materials based on self-healing effect

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作  者:司磊磊 师伟峰 魏建平[1,2] 刘勇[1,2] 姚邦华[1,2] SI Leilei;SHI Weifeng;WEI Jianping;LIU Yong;YAO Banghua(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;State Key Laboratory Cultivation Base for Gas Geo-logy and Gas Control,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区:[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南理工大学瓦斯地质与瓦斯治理国家重点实验室培育基地,河南焦作454003

出  处:《煤炭学报》2023年第11期4097-4111,共15页Journal of China Coal Society

基  金:国家自然科学基金面上资助项目(52374194,52274193);河南理工大学杰出青年基金资助项目(J2023-1)。

摘  要:水泥基材料是煤矿井下最常用的注浆封孔材料,但是受应力扰动、水泥材料失水收缩等影响,传统水泥基材料容易形成再生裂隙,导致钻孔内瓦斯抽采率降低。为了减小再生裂隙对瓦斯抽采效果的影响,研发一种自修复水泥封孔材料,当注浆位置再次产生裂隙后可实现裂隙的自愈合。首先,通过裂隙自修复实验研究了自修复水泥在空气条件下的裂隙自修复性能,采用高倍测量显微镜记录裂隙在不同时间内的宽度变化规律,发现在自然空气条件下,自修复水泥在4 d内能够修复最大宽度为0.46 mm的裂隙,裂隙处生成大量白色矿物,14 d内修复物体积仍有明显增长。刮去修复产物后,仍有白色矿物生成。为进一步研究自修复产物的生成机理,通过SEM-EDS对比分析了自修复水泥以及不加修复剂的净水泥2种水泥水化7、21 d的微观形貌和微观元素分布,并通过XRD、拉曼光谱仪对比分析了2种水泥的物相信息。SEM-EDS结果显示,净水泥中针状物质和絮状物质相互交联,整体结构致密,而自修复水泥中分布大量多孔状物质,结构比较疏松。相较于净水泥,自修复水泥水化产物中C、Na、Al、Si四种元素的质量分数明显较高。裂隙修复物表面分布大量排列紧密的长条状物质,主要元素组成为C、O、Na、Ca。XRD结果显示,和净水泥相比,自修复水泥中出现更多未水化硅酸三钙的衍射峰,相同水化时间,净水泥水化产物主要是氢氧化钙和钙矾石,而自修复水泥中出现了钠长石、沸石等铝硅酸盐矿物。裂隙修复物由沸石、钙霞石、硅灰石等多种硅酸盐矿物以及碳酸钙组成,其中碳酸钙的衍射峰数目最多。拉曼光谱结果显示,同净水泥相比,自修复水泥在2860~2960 cm^(-1)处具有明显拉曼谱峰,水化7 d,净水泥拉曼峰普遍尖锐,而自修复水泥拉曼峰明显更宽。净水泥中出现较多高强度氢氧化钙的拉曼峰,而自修复水泥�Cement-based materials are the most commonly used grouting and sealing materials in underground coal mines,but due to the effects of stress perturbation as well as water loss and shrinkage of cementitious materials,the traditional cementitious materials are prone to regeneration cracks,which leads to the reduction of gas extraction rate in the boreholes.In order to reduce the influence of regenerated fissures on the gas extraction effect,a self-repairing cement sealing material is developed,which can realize the self-healing of fissures when the fissures are generated again at the grouting location.Firstly,the self-healing performance of self-healing cement under air conditions was studied through the fissure selfhealing experiment,and a high-magnification measuring microscope was used to record the change rule of the fissure width over time.It was found that the self-healing cement was able to repair the fissure with the maximum width of 0.46 mm in 4 d under the natural air conditions.A large amount of white minerals were generated at the fissure,and the volume of repaired material still increased significantly in 14 d.After scraping off the repair products,white minerals were still generated.In order to further study the generation mechanism of the self-repair products,the microscopic morphology and microelement distribution of the two kinds of cements hydrated for 7 and 21 d were comparatively analyzed by SEM-EDS,and the physical phase information of the two kinds of cements was comparatively analyzed by XRD and Raman spectroscopy.The SEM-EDS results showed that,for the traditional cement,the needle-like and flocculent materials were crosslinked with each other and the overall structure was dense,whereas a large number of porous materials were distributed in the self-healing cement and the structure was relatively loose.Compared with the traditional cement,the mass fractions of four elements,C,Na,Al and Si,in the hydration products of the self-repairing cement were significantly higher.A large number of tightl

关 键 词:封孔材料 自修复水泥 裂隙自修复 二次水化 碳化作用 

分 类 号:TD712[矿业工程—矿井通风与安全]

 

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