摘要
为明确纤维与粉土对水泥稳定风积沙的增强效果,对不同纤维掺量、粉土掺量、养护龄期下的试样进行抗压强度试验,并通过扫描电镜(SEM)和核磁共振(NMR)试验对试样的微观结构特点进行了表征。结果表明,纤维与粉土的加入能有效提高试样的抗压强度;养护龄期与试样强度增长为正相关关系;最佳纤维掺量和最佳粉土掺量分别为2%、15%;在此掺量下,养护28 d试样的强度达到1.68 MPa,相比于水泥稳定风积沙的强度(0.45 MPa)提高了3.73倍。扫描电镜结果表明,试样强度提升来源于纤维在试样中的空间交织作用以及粉土的填充效应。核磁共振结果进一步表明,纤维的加入可降低试样中大孔与中孔的比例,其中2%纤维掺量的降低幅度最大。该研究结果可为风积沙地区路基的施工与设计提供有效参考。
To clarify the reinforcing effect of fiber and silt on cement-stabilized aeolian sand,compressive strength tests were conducted on specimens with different fiber dosage,silt dosage,and curing age.The microstructural characteristics of the specimens were characterized by scanning electron microscopy(SEM)and nuclear magnetic(resonance NMR)tests.The results show that the addition of fiber and silt can effectively improve the compressive strength of the specimens;The age of curing is positively correlated with the strength growth of the specimens;The optimal fiber dosage and the optimal silt dosage are 2%and 15%,respectively;At this dosage,the strength of the specimens cured for 28 d reached 1.68 MPa,which is 3.73 times higher compared with that of the cement-stabilized airborne sand(0.45 MPa).Scanning electron microscopy results show that the strength enhancement of the specimens originated from the spatial intertwining of the fibers in the specimens as well as the filling effect of the silt.The nuclear magnetic resonance results further show that the addition of fibers could reduce the ratio of macropores and mesopores in the specimens,with the greatest reduction at 2%fiber incorporation.The results of this study can provide an effective reference for the construction and design of subgrade in aeolian sand areas.
作者
杨熙
胡再强
李宏儒
王一
魏宇轩
刘超超
葛秀钰
YANG Xi;HU Zai-qiang;LI Hong-ru;WANG Yi;WEI Yu-xuan;LIU Chao-chao;GE Xiu-yu(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering,Xi’an 710048,China)
出处
《水电能源科学》
北大核心
2025年第2期123-127,共5页
Water Resources and Power
基金
陕西省自然科学基础项目(2017JM5059)。
关键词
风积沙
纤维
粉土
无侧限抗压强度
微观结构
aeolian sand
fiber
silt
unconfined compression strength
microstructure
