摘要
运用纳米SiO_(2)和超细水泥替代普通硅酸盐水泥对钙质砂进行加固处理,设计不同情况下无侧限抗压强度试验和三轴剪切试验,研究纳米SiO_(2)掺入对于钙质砂–超细水泥加固体静力特性影响,并利用扫描电子显微镜(SEM)观察试样微观结构进而分析作用机理。试验结果表明:超细水泥较普通硅酸盐水泥对于钙质砂的固化效果更好;纳米SiO_(2)掺入对加固体强度有增强作用且影响效果存在临界值,掺量超过临界值后强度下降;纳米SiO_(2)从峰值强度、峰值应变、黏聚力等方面改善了超细水泥钙质砂加固体的静力特性;微观角度分析发现超细水泥比普通水泥生成更多钙矾石晶体,形成一定的网格状结构,从而增强其宏观强度。
To study the incorporation of nano-SiO_(2) for calcareous sand-super fine cement plus solid static characteristics,nano-SiO_(2) and ultra-fine cement were used to replace ordinary portland cement to reinforce calcareous sand.Unconfined compressive strength test and triaxial shear test were designed under different conditions,and the microstructure of samples was observed by SEM to analyze the mechanism of action.The test results show that superfine cement has better reinforcement effect on calcareous sand than ordinary portland cement;there is a critical value for the effect of nano-SiO_(2) incorporation on the strength of ultrafine cement,and the strength decreases after the amount exceeds the critical value.In terms of peak strength,peak strain and cohesion,nano-SiO_(2) can improve the static characteristics of superfine cement calcareous sand.From a microscopic point of view,it is found that ultra-fine cement produces more ettringite crystals than ordinary cement,forming a certain grid-like structure,thereby enhancing its macro strength.
作者
矫慧慧
陈昊
赫庆坤
高盟
Jiao Huihui;Chen Hao;He Qingkun;Gao Meng(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;Experiment Center of School of Materials Science and Engineering,Shandong University of Sci-ence and Technology Qingdao 266590,Shandong,China)
出处
《岩土工程技术》
2022年第3期252-258,共7页
Geotechnical Engineering Technique
基金
国家自然科学基金青年基金项目(51708189)。
