纳米材料对硫酸盐渍土盐胀的影响

龚富茂; 万旭升; 钟昌茂; 杨婷婷; 慎嘉宾; 邓世磊

doi:10.13204/j.gyjz202001019

纳米材料对硫酸盐渍土盐胀的影响

doi: 10.13204/j.gyjz202001019

西南石油大学土木工程与建筑学院, 成都 610500

基金项目:

国家自然科学基金项目（41601068）；西南石油大学科研"起航计划"（2015QHZ025）。

详细信息

作者简介:
龚富茂,男,1993年出生,硕士研究生。

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- 被引次数: 7
出版历程
- 收稿日期: 2019-05-10

EFFECT OF NANOMETER MATERIAL ON SALT EXPANSION OF SULFATE SALINE SOIL

School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China

摘要

摘要: 为探寻硫酸盐渍土的改良方法,以降低硫酸盐渍土对基础工程的盐胀破坏,选取甘肃河西走廊地区典型盐渍土作为研究对象,在室内冻融循环试验条件下测试硫酸盐渍土的盐胀率。通过掺加改良材料(纳米碳酸钙、纳米二氧化硅或相变材料)对硫酸盐渍土进行改良,并测试改良后硫酸盐渍土的盐胀量。最后结合过饱和比理论和电镜扫描图像简要分析盐晶体的析出规律以及各掺料对盐胀的影响。结果表明:纳米碳酸钙、二氧化硅以及相变材料均对硫酸盐渍土有抑胀效果, 2%掺量的纳米二氧化硅、纳米碳酸钙或相变材料对含盐量在3%以下的硫酸盐渍土的改良效果均较好,其中纳米二氧化硅优于纳米碳酸钙和相变材料,相变材料的最佳掺量约为2%。
- 纳米碳酸钙 /
- 纳米二氧化硅 /
- 冻融循环 /
- 硫酸盐渍土 /
- 盐胀
Abstract: In order to explore a reasonable improvement method in sulfate saline soil to reduce the salt expansion damage of foundation projects, the lab experiment was experimentalized by using the typical saline soil in Hexi corridor of Gansu as the research object, and the salt expansion ratios of the sulfate saline soil were tested under freeze-thaw cycle conditions. The properties of sulfate salt soils were improved by adding nanometer materials (nano-calcium carbonate, nano-silica) and phase change material (PCM), and salt expansion amounts were measured on the modified sulfate saline soil. Finally, the supersaturation ratio theory and electron microscope scanning images were combined to briefly analyze the precipitation law of salt crystal and the influence of various admixtures on it. The experimental results showed that nano-silica, nano-calcium carbonate and phase change material had an inhibitory effect on the salt expansion of the sulfate saline soil. When the mix content was 2%, each of them showed good improvement effects on sulfate saline soils with no more than 3% salt content. And the improvement effects of nano-silica on salt swelling of sulfate saline soil were better than that of nano-calcium carbonate or PCM, and there existed a optial mix amount of PCM, which was about 2%.
- nano-calcium carbonate /
- nano-silica /
- freeze-thaw cycle /
- sulfate saline soil /
- salt expansion

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