低剂量水泥稳定红土粒料的强度指标和动态特性

摘要/Abstract

摘要： 为寻求更加合理的水泥稳定红土粒料强度指标和动态特性的评价方法,研究了低剂量(2.5%和4.0%,质量分数)水泥稳定红土粒料的不同强度指标和动态特性,通过开展两种低剂量水泥稳定红土粒料的抗压、抗拉强度和动态模量试验,分析了不同因素对强度、动态模量和相位角的影响规律,建立了水泥稳定红土粒料不同强度指标的关系模型和动态模量依赖模型。结果表明,水泥稳定红土粒料在不同荷载模式下的拉压强度水平差异明显,抗压强度显著大于抗拉强度,其中抗压强度＞弯拉强度＞劈裂强度＞直接拉伸强度,并且不同强度之间具有显著的线性关系,可采用抗压强度、弯拉强度或劈裂强度取代直接拉伸强度评价水泥稳定红土粒料的抗拉强度特性。低剂量水泥稳定红土粒料是一种非线弹性材料,随着应力和频率的增大,动态模量均呈S型增长规律,相位角则分别呈逐渐减小和先增大后减小的趋势,具有显著的应力和频率依赖性。基于应力水平和加载频率的水泥稳定红土粒料动态模量依赖模型可较为真实地反映其非线性响应特性,为准确获取此类材料模量值提供了一种有效途径。

关键词: 水泥稳定红土粒料, 强度指标, 相位角, 动态特性, 非线性, 依赖模型

Abstract: The aim of this study is to find a more reasonable evaluation method for the strength index and dynamic characteristics of cement stabilized laterite granules. Different strength indexes and dynamic characteristics of cement stabilized laterite granules with low content (2.5% and 4.0%, mass fraction) were investigated. Compressive, tensile strength and dynamic modulus tests of low content cement stabilized laterite granules were carried out. The laws of strength, dynamic modulus and phase angle influenced by different factors were analyzed. The relational model with different strength indexes and dynamic modulus dependence model of cement stabilized laterite granules were developed. The results show that there are significant differences in the tensile and compressive strength of cement stabilized laterite granules under different stress modes, and the compressive strength is significantly greater than the tensile strength. For cement stabilized laterite granules, the compressive strength > flexural strength > splitting strength > direct tensile strength, and there is a significant linear relationship between strength indexes. It is possible to evaluate the tensile strength properties of cement stabilized laterite granules using compressive strength, flexural strength or splitting strength instead of direct tensile strength. The low content cement stabilized laterite granules is a kind of non linear elastic material, and its dynamic parameters have significant dependence on stress and frequency. Specifically, with the increase of stress and frequency, the dynamic modulus increases in S-shape, while the phase angle decreases gradually and increases first and then decreases, respectively. The dynamic modulus dependence model of cement stabilized laterite granules base on stress level and loading frequency reflects the nonlinear response characteristics more realistically and accurately obtains the modulus values of such materials.

Key words: cement stabilized laterite granule, strength index, phase angle, dynamic characteristic, nonlinearity, dependent model

中图分类号:

U414.3

李倩倩, 王旭东. 低剂量水泥稳定红土粒料的强度指标和动态特性[J]. 硅酸盐通报, 2023, 42(9): 3402-3411.

LI Qianqian, WANG Xudong. Strength Index and Dynamic Characteristics of Low Content Cement Stabilized Laterite Granules[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3402-3411.

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