摘要
为了探究水泥掺量和碳化时间对水泥土(简称CS)的改性效果,对水泥质量分数为10%,15%,20%和25%,碳化时间为0 h和6 h,1,2和4 d的CS进行无侧限抗压强度测试。研究水泥掺量和碳化时间对CS的抗压强度、峰值应变和能量耗散的影响。研究发现:1)不同碳化时间下,掺入20%水泥的CS抗压强度提高最显著;不同水泥掺量下,分别碳化2,2,1 d和6 h的CS抗压强度最大,较未碳化CS的提高幅度在51.5%~171.1%之间。2)不同水泥掺量下,碳化2 d的CS峰值应变增加最显著,与未碳化CS的差值在3.1%~4.6%之间,能够较好提高CS的延性。3)不同水泥掺量下,分别碳化2,1,1和1 d的CS的能量耗散率最大,与未碳化的CS的差值在0.08~0.13之间,抵抗外部破坏的能力最强。
In order to explore the modification effect of cement content and carbonation time on cement soil(CS),unconfined compressive strength of CS specimen with cement mass fraction of 10%, 15%, 20% and 25% and carbonation time of 0 h and 6 h, 1, 2 and 4 d were tested. The influence of cement content and carbonation time on compressive strength, peak strain and energy dissipation of CS were studied. The results show that:(1) the compressive strength of CS with 20% cement content increases most significantly under different carbonation time. The compressive strength of CS carbonated for 2, 2, 1 d and 6 h under different cement content are the highest, and the increase range is 51.5%~171.1% compared with non-carbonated CS.(2) the peak strain of CS increases most significantly in carbonated 2 d under different cement content, which can improve the ductility of CS, and the difference between carbonated and non-carbonated CS is between 3.1%~4.6%.(3) the energy dissipation rate of CS carbonated for 2, 1, 1 and 1 d under different cement content are the largest, which shows the strongest resistance to external damage, and the difference between CS carbonated and non-carbonated is between 0.08~0.13.
作者
王伟
周航
李健
李娜
WANG Wei;ZHOU Hang;LI Jian;LI Na(School of Civil Engineering,Shaoxing University,Shaoxing 312000,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第12期3239-3246,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(41772311)。
关键词
水泥土
碳化
无侧限抗压强度
能量耗散率
cement soil
carbonation
unconfined compressive strength
energy dissipation rate
