不同纳米材料改性水泥土力学性能的对比研究

Mechanical Properties of Cement Mixed Soil Modified by Different Nanomaterials

水泥土因其廉价和性能优异等特点在建筑工程中应用广泛,但水泥土仍存在强度低和变形大等问题。纳米材料是目前建筑材料领域研究的重点之一,加入适量的纳米材料能够改变水泥土在强度或刚度等方面的力学性能。主要对纳米SiO2、纳米MgO和纳米Al2O3等纳米材料改性水泥土的力学性能进行分析和总结。研究表明:(1)适量掺入纳米材料能有效改善普通水泥土的物理力学性能,其最佳材料掺入量与水泥含量、含水率和水泥土的力学相关性、物理力学性质等诸多因素密切相关;(2)对于纳米SiO2改性复合水泥土,3%~4%掺量均能提高水泥土的强度;(3)对于纳米MgO改性复合水泥土,纳米MgO最优掺入比为1%;(4)对于纳米Al2O3改性复合水泥土,最优掺入比在2.5%~4%之间。

Cement mixed soil is widely used in construction projects because of its low cost and excellent performance,but there are still some problems such as relative low strength and large deformation.Nanomaterials are one of the focus on the current research in the field of building materials.Proper addition of nanomaterials to cement mixed soils can effectively improve their mechanical properties.This paper primarily analyzes and summarizes the mechanical properties of cement mixed soils modified by nano-SiO2,nano-MgO and nano-Al2O3.The conclusions show that:(1)The optimum content of nanomaterials is related to the cement content,moisture content and physical properties of cement mixed soils;(2)The soils with a nano-SiO2 content between 3%and 4%can effectively improve the strength of the cement mixed soil;(3)The optimum incorporation ratio of nanoMgO cement-modified soil is 1%.(4)The optimum content of nano-Al2O3 cement-modified soil is between 2.5% and 4%.