硅藻土改性滨海水泥土力学性能试验研究。

Jiyuan Fang, Yunfeng Wang, Kefa Wang, Wenhao Dai, Yanfei Yu, Cuihong Li
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引用次数: 3

摘要

硅藻土是一种富含SiO2的非金属矿产资源,可用于滨海水泥土的改性。为了探讨硅藻土对7天龄沿海水泥土的力学改性效果,以水泥掺量为5%(质量分数)的沿海水泥土为基础,混合0%、5%、10%、15%和20%(质量分数)的硅藻土进行改性。通过无侧限抗压强度试验、三轴松散不排水试验、背散射电子成像(BSE)和能谱(EDS)技术,探讨硅藻土含量和围压对改性滨海水泥土峰值强度的影响。通过曲线拟合建立了DE试样峰值强度与硅藻土含量和围压之间的经验公式,拟合效果理想。硅藻土与海岸水泥土混合时,从力学性能和最大压剪增长率的经济效益角度考虑,硅藻土的最佳掺量为5%。无侧限抗压强度试验表明,硅藻土含量为5%的滨海水泥土的峰值强度和弹性模量分别比水泥土高37%和57%。三轴未固结不排水试验表明,改性滨海水泥土内摩擦角稳定在30°左右,DE-5、DE-10、DE-15、DE-20的黏聚力较水泥土分别提高28%、48%、78%、97%。细观试验发现,改性滨海水泥土的孔隙分布与强度变化密切相关。结果表明,硅藻土的加入能有效改善水泥土的力学性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental Study on the Mechanical Properties of Diatomite-Modified Coastal Cement Soil.

Experimental Study on the Mechanical Properties of Diatomite-Modified Coastal Cement Soil.

Experimental Study on the Mechanical Properties of Diatomite-Modified Coastal Cement Soil.

Experimental Study on the Mechanical Properties of Diatomite-Modified Coastal Cement Soil.

Diatomite is a non-metallic mineral resource rich in SiO2, which can be used to modify coastal cement soil. In order to explore the mechanical modification effect of diatomite on coastal cement soil at the age of 7 days, based on coastal cement soil with cement content of 5% (mass fraction), diatomite of 0%, 5%, 10%, 15% and 20% (mass fraction) was mixed for modification. Through the unconfined compressive strength test, the triaxial unconsolidated undrained test, backscattered electron imaging (BSE), and energy-dispersive spectroscopy (EDS) technology, the influence of diatomite content and confining pressure on the peak strength of modified coastal cement soil was explored. The empirical formula between the peak strength of the DE specimen and the content of diatomite and confining pressure was established by curve fitting, and the fitting effect was ideal. When diatomite was mixed with coastal cement soil, the optimal dosage of diatomite was 5% from the perspective of mechanical properties and economic benefits of the maximum growth rate of compression and shear. The unconfined compressive strength test showed that the peak strength and elastic modulus of the modified coastal cement soil with 5% diatomite content were 37% and 57% higher than those of cement soil, respectively. The triaxial unconsolidated undrained test showed that the internal friction angle of the modified coastal cement soil was stable at about 30°, and cohesion of DE-5, DE-10, DE-15, and DE-20 increased by 28%, 48%, 78%, and 97%, respectively, compared to cement soil. The microscopic test found that the pore distribution of modified coastal cement soil is closely related to the strength change. The results show that the addition of diatomite can effectively improve the mechanical properties of soil-cement.

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