| 复合粉煤灰砒砂岩水泥土力学性能室内试验研究 |
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| 引用本文： | 杨健,李晓丽,王辉,耿凯强.复合粉煤灰砒砂岩水泥土力学性能室内试验研究[J].排灌机械工程学报,2021,39(12):1230-1236. |
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| 作者姓名： | 杨健 李晓丽 王辉 耿凯强 |
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| 作者单位： | 内蒙古农业大学水利与土木建筑工程学院,内蒙古 呼和浩特010018 |
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| 摘 要： | 为了研究粉煤灰对砒砂岩水泥土力学性能、破坏模式、微观结构和细观构造的影响,对不同粉煤灰掺量、不同龄期的砒砂岩复合水泥土进行了无侧限抗压试验,通过扫描电镜(SEM)和超景深三维显微镜对复合粉煤灰砒砂岩水泥土的微观结构和表观形貌进行分析观测.结果表明:适量掺入粉煤灰对砒砂岩复合水泥土的强度形成具有一定的促进作用;复合粉煤灰砒砂岩水泥土的应力-应变曲线可分为压密阶段、弹性阶段、塑性屈服阶段和破坏阶段;粉煤灰的掺入有利于水泥土变形模量的增长,能够促进砒砂岩复合水泥土的变形控制;扫描电镜和超景深三维显微镜分析表明,粉煤灰玻璃体中的活性物质在碱环境下与水泥水化产物Ca(OH)2反应生成致密且稳定的C-S-H凝胶和AFt构成网状结构,促使试件内部胶结更加紧密,并对表观的沟壑孔洞进行填充和密实,从而提升砒砂岩复合水泥土的强度性能以及抑制其裂缝扩展和破坏作用.
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| 关 键 词： | 砒砂岩 粉煤灰 破坏模式 耐水性能 力学性能 |
| 收稿时间： | 2020-11-04 |
Indoor experimental study on mechanical properties of composite fly ash and Pisha-sandstone cement soil |
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| YANG Jian,LI Xiaoli,WANG Hui,GENG Kaiqiang.Indoor experimental study on mechanical properties of composite fly ash and Pisha-sandstone cement soil[J].Journal of Drainage and Irrigation Machinery Engineering,2021,39(12):1230-1236. |
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| Authors: | YANG Jian LI Xiaoli WANG Hui GENG Kaiqiang |
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| Institution: | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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| Abstract: | To study the influence of fly ash on the mechanical properties, failure mode, microstructure and mesostructure of Pisha-sandstone cement soil, unconfined compressive tests were carried out on Pisha-sandstone composite cement soil with different fly ash content and different ages, the microstructure and apparent morphology of composite fly ash and Pisha-sandstone cement soil were analyzed and observed by a scanning electron microscope(SEM)and a 3D microscope with super depth of field. The results show that the proper amount of fly ash can promote the formation of the strength of the Pisha-sandstone composite cement soil. The stress-strain curve of composite fly ash and Pisha-sandstone cement soil can be divided into compaction stage, elastic stage, plastic yield stage and failure stage. The incorporation of fly ash is conducive to the increase of the deformation modulus of cementsoil, and can promote the deformation control of Pisha-sandstone composite cementsoil. The scanning electron microscope and super-depth three-dimensional microscope analysis shows that the active material in the fly ash glass body reacts with the cement hydration product calcium hydroxide in a strong alkali environment to generate a dense and stable C-S-H gel and AFt to form a network structure, promote the internal cementation of the specimen to be tighter, and the apparent gully holes are filled and compacted, thereby the strength of the Pisha-sandstone composite cement soil are improved, meanwhile its crack propagation and destruction are inhibited. |
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| Keywords: | Pisha-sandstone fly ash destruction mode water resistance mechanical properties |
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