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盐渍土在路基工程中的应用是滨海地区高等级公路建设的一项重要议题,对于就地取材、降低工程造价具有重大实际意义。以水泥对滨海地区盐渍土进行改良是盐渍土利用的一种常规做法。为了从微观层面掌握水泥改良盐渍土的强度形成机理,利用扫描电镜结合IPP(Image-Pro Plus)专业图像分析技术,分析了颗粒椭圆度、颗粒个数、颗粒等效圆直径、孔洞率等指标与不同养护龄期、改良剂用量、养护条件的水泥改良盐渍土试件强度指标的关系。试验及分析结果表明:改良盐渍土的颗粒椭圆度、颗粒个数、颗粒等效圆直径、孔洞率等几个微观指标与改良盐渍土的强度指标具有较好的相关性,随着颗粒椭圆度、颗粒个数、孔洞率的降低及颗粒等效圆直径的提高,改良盐渍土的强度指标提高。
The application of saline soil in subgrade construction is an important topic in high-grade highway construction in the coastal area. It has great practical significance for local materials and reducing construction cost. The improvement of saline soil in the coastal area by cement is a common practice for the utilization of saline soil. In order to grasp the strength formation mechanism of cement-modified saline soils from the microscopic level, the image ellipse, the number of particles, the equivalent circle diameter of particles and the hole ratio were analyzed by scanning electron microscopy combined with the professional image analysis technology of IPP (Image-Pro Plus) The relationship between indexes and strength indexes of cement modified saline soil specimens with different curing ages, modifier dosage and curing conditions. The results of the test and analysis show that there are good correlations between the microscopic indices of the improved saline soil, such as the ellipticity of particles, the number of particles, the equivalent circle diameter of particles and the hole ratio, and the strength indexes of improved saline soils. Ovality, the number of particles, the reduction of the porosity and the increase of the diameter of the circle of equivalent particles, and the improvement of the strength index of the improved saline soil.