等离子体改性岩沥青增强矿渣固化体力学性能的研究

Research on Mechanical Properties of Solidified Slag Toughened by Plasma Modified Rock Asphalt

矿渣在油气井工程中已有广泛应用,但其脆性较水泥石大,限制了其推广。为降低矿渣固化体的脆性并提高其力学性能,研究了不同掺量的等离子体改性岩沥青对矿渣固化体力学性能的改善效果,并使用扫描电镜、接触角测定仪、X射线光电子能谱分析等测试方法对矿渣固化体的润湿角、表面形貌、结构、性能进行了分析。结果表明:改性岩沥青加量为3%时矿渣固化体的性能最优,其抗拉强度最大提高了50%,抗压强度最大提高了26%;通过等离子改性,岩沥青增加了亲水基团;岩沥青增韧矿渣固化体的机理在于改性后岩沥青颗粒与矿渣固化体结合紧密,颗粒与水化产物形成良好的胶结。固化体受外力时,岩沥青颗粒起到增大裂缝间摩擦力,缓冲外部载荷的作用,进而提高了矿渣固化体的力学形变能力。

Slag has been widely used in oil and gas well engineering, but its brittleness is larger than that of cement stone, which limits its promotion. To reduce the brittleness of slag solidified body and improve its mechanical properties, the effect of different dosages of plasma-modified rock asphalt on the mechanical properties of slag solidified body was studied. Scanning electron microscopy, contact angle measuring instrument and X-ray photoelectron spectroscopy were used for analyzing the wetting angle, surface morphology, structure and properties of the slag solidified body. The results show that the performance of slag solidified body is the best when the modified rock asphalt is 3%, the tensile strength is increased by 50%, and the compressive strength is increased by 26%;by plasma modification, rock asphalt have more hydrophilic groups;the mechanism of the rock asphalt toughening the slag solidified body is that the modified rock asphalt particles are tightly combined with the slag solidified body, and the particles form a good cementation with the hydration product. When the solidified body is subjected to an external force, the rock asphalt particles act to increase the friction between the cracks and buffer the external load, thereby improving the mechanical deformation ability of the slag solidified body.