粉土塑性指数对水泥基粉土气泡混合轻质土性能影响研究

Study on the Effect of Silt Plasticity Index on the Properties of Silt-Based Foamed Concrete

摘要: 为了明确黄泛区粉土用作水泥基泡沫轻质土外掺料的可行性，通过重塑配料的方式，调整轻质土湿密度、粉土掺量、粉土塑性指数等指标，研究了粉土塑性指数对泡沫轻质土物理力学性能的影响规律，包括无侧限抗压强度、弹性模量、流动度、干燥收缩值及吸水率。结果表明，随着粉土的塑性指数增大，气泡混合轻质土的基本力学性能减小，浆体的流动度降低，干燥收缩值增大，吸水率增大，但是可以满足路用性能要求。

Abstract: In order to define the possibility of silt in the Yellow River Flood Area to be used as admixture in foamed concrete, indexes including wet density, silt content and silt plasticity index were adjusted by remixing the components. The mechanical properties, including the unconfined compressive strength, elastic modulus, fluidity, drying shrinkage value and water absorption, were researched by considering the silt plasticity index. The results show that with the increase of plasticity index of silt, the basic mechanical properties of silt-based foamed concrete decreased, and the fluidity of slurry decreased, the drying shrinkage value increased, water absorption rate increased, but it can meet the road performance requirements.