img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2018, Vol. 40 ›› Issue (1): 110-115.doi: 10.7522/j.issn.1000-0240.2018.0014

• 寒区科学与技术 • 上一篇    下一篇

不同养生龄期下水泥土经冻融循环后力学性能试验探究

崔宏环1, 裴国陆1, 姚世军2, 王高勇3, 张治国2   

  1. 1. 河北建筑工程学院河北省土木工程诊断、改造与抗灾重点实验室, 河北 张家口 075000;
    2. 张家口市公路工程管理处, 河北 张家口 075000;
    3. 张家口市交通运输局, 河北 张家口 075000
  • 收稿日期:2017-10-12 修回日期:2018-01-12 出版日期:2018-02-25 发布日期:2018-04-13
  • 作者简介:崔宏环(1974-),女,河北张家口人,教授,2017年在北京交通大学获博士学位,从事冻土基本性质与路基路面工程本构模型方面研究.E-mail:cuihonghuan729@163.com.
  • 基金资助:
    河北建筑工程学院博士基金(XBKY09);张家口市科技与地震局指导项目(1421018B);河北建筑工程学院创新基金项目(XB201614)资助

Experimental study of mechanical properties of cement soil of different curing time subjected to freezing-thawing cycles

CUI Honghuan1, PEI Guolu1, YAO Shijun2, WANG Gaoyong3, ZHANG Zhiguo2   

  1. 1. Hebei Key Laboratory of Diagnosis, Reconstruction and Anti-disaster of Civil Engineering, Hebei University of Architecture, Zhangjiakou 075000, Hebei, China;
    2. Zhangjiakou Highway Engineering Management Office, Zhangjiakou 075000, Hebei, China;
    3. Zhangjiakou Transportation Bureau, Zhangjiakou 075000, Hebei, China
  • Received:2017-10-12 Revised:2018-01-12 Online:2018-02-25 Published:2018-04-13

摘要: 针对季节性冻土区域,对不同养护期龄的水泥改良土在不同冻融循环次数条件下进行单轴抗压强度试验。探究养护期龄、冻融循环次数对抗压强度、质量损失率以及变形模量E50的影响。结果表明:受冻融循环与水泥水化反应的影响,龄期28 d时,二者共同作用,使其结构重塑,导致三种掺量下的抗压强度随冻融循环次数增加均先减小后增大;质量损失率均先下降后上升,且小于0;变形模量E50数据随循环次数增加整体呈收敛趋势,即掺量10%时呈下降趋势,6%时呈上升趋势。而龄期90 d后,水化反应基本完全,结构近于稳定,经冻融循环造成不可修复的损伤,导致抗压强度均随循环次数增加呈下降趋势;掺量6%时的质量损失率也逐渐增长大于0;E50数据整体呈发散状。

关键词: 水泥土, 冻融循环, 龄期, 抗压强度

Abstract: The uniaxial compressive strength tests of cement modified soil with different curing timeunder different freezing-thawing cycles were carried out,according to various seasonal frozen soil regions. The effects of curing time and freezing-thawing cycles on compressive strength, mass loss rate and deformation modulus E50 were investigated. At the curing time of 28 days, under freezing-thawing cycles and hydration reaction of cement are combined to make the structure remodeling. As a result, the compressive strengths with three dosages decrease first and then increase with the increase of the number of freezing-thawing cycles; the mass loss rate, always less than 0,decrease first and then increase; the data of deformation modulus E50 is convergent with the increase of freezing-thawing cycles. When the admixtureis 10%, it shows a decreasing trend, and when the admixtureis 6%, it shows an increasing trend. That is, E50 is decreasing at 10%, and E50 is increasing at 6%. At the curing time of 90 days, the hydration reaction isbasically completed and the structure isnearly stable. Thus freezing-thawing cycles will cause irreparable damage, resulting in compressive strength decreasing with the increase of freezing-thawing cycles; when the admixtureis 6%, the mass loss rate gradually increases and becomes more than 0 with a generally divergent E50.

Key words: cement soil, freezing-thawing cycles, curing time, compressive strength

中图分类号: 

  • TU411