| 碱激发材料固化低液限粉黏土路用性能及抗冻融特性研究 |
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| 引用本文： | 陈锐,郝若愚,李笛,包卫星,来弘鹏.碱激发材料固化低液限粉黏土路用性能及抗冻融特性研究[J].工程地质学报(英文版),2022,30(2):327-337. |
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| 作者姓名： | 陈锐 郝若愚 李笛 包卫星 来弘鹏 |
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| 作者单位： | 长安大学公路学院，西安 710064，中国 |
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| 基金项目： | 长安大学中央高校基本科研业务费专项;陕西省自然科学基金;国家自然科学基金 |
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| 摘 要： | 以伊犁地区S315线蜂场至尼勒克段低液限粉黏土为研究对象,以碱激发材料为固化剂,对粉质黏土和其固化土开展了路用性能指标试验与冻融循环试验,并利用电镜扫描试验(SEM)与X射线衍射试验(XRD)研究了固化土的微观特征,探讨了碱激发材料对粉质黏土路用性能指标与抗冻融特性的影响.试验结果表明,固化土的无侧限抗压强度与抗剪强度...
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| 关 键 词： | 粉质黏土 路用性能 碱激发材料 冻融循环 固化机理 |
| 收稿时间： | 2021-03-18 |
STUDY ON ROAD PERFORMANCE AND FREEZE-THAW RESISTANCE OF ALKALI ACTIVATED MATERIAL STABILIZED LOW-LIQUID-LIMIT SILTY CLAY |
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| CHEN Rui,HAO Ruoyu,LI Di,BAO Weixing,LAI Hongpeng.STUDY ON ROAD PERFORMANCE AND FREEZE-THAW RESISTANCE OF ALKALI ACTIVATED MATERIAL STABILIZED LOW-LIQUID-LIMIT SILTY CLAY[J].Journal of Engineering Geology,2022,30(2):327-337. |
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| Authors: | CHEN Rui HAO Ruoyu LI Di BAO Weixing LAI Hongpeng |
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| Institution: | School of Highway, Chang'an University, Xi'an 710064, China |
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| Abstract: | The current study investigates the use of Alkali-Activated Material (AAM) to stabilize a silty clay with low liquid limit, collected from a construction site between Fengchang to Ni Leke section of line S315 in Yili Area. The experimental program includes road performance index tests and freeze-thaw cycling tests. They are performed on the silty clay and the stabilized soil to study the effect of AAM on the road performance index and freeze-thaw resistance. Micro characterization using scanning electron microscope(SEM) and X-Ray diffraction(XRD) is also carried out to study the underlying stabilizing mechanisms. The results show that the unconfined compressive strength and shear strength of solidified soil increase with the content of AAM and the curing age. The CBR value and resilient modulus of solidified soil increase with the content of AAM. The road performance indices of AAM stabilized soils satisfy the regulation requirements. The frozen heave and thawed settlement rates of silty clay are related to temperature gradient and water content. At the same temperature dropping range, the freeze-thaw effect is more evident on the silty clay at smaller temperature gradient. At the same temperature gradient, the freeze-thaw effect is more evident at higher water content. The frost heave rate of silty clay treated with different content of AAM under water supply condition is less than 1%, showing no frozen heave tendency. The results of micro characterization show that the C(-A)-S-H gel is the major cementing agents formed after AAM stabilization and its content increases with curing age. This cementing agent fills the pores between the soil particles and cements the soil particles together leading to a dense micro structure, which increases the strength and freeze-thaw resistance of stabilized soil. |
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