石灰偏高岭土改良粉砂土强度特性与微观机理
作者:
基金项目:

河南省高等学校青年骨干教师资助计划项目(2019GGJS142,2020GGJS136);国家自然科学基金资助项目(51509274);河南省科技攻关项目(202102310584);岩土力学与工程国家重点实验室开放基金项目(Z0190202);中原工学院基本科研业务费专项资金项目(K2018YY013,K2018YY012)


Strength Characteristics and Micro mechanism of Lime Metakaolin Modified Silty Soil
Author:
  • 摘要
  • | |
  • 访问统计
  • |
  • 参考文献 [33]
  • |
  • 相似文献 [20]
  • | | |
  • 文章评论
    摘要:

    以河南地区典型粉砂土为研究对象,制备不同石灰及偏高岭土掺量下的改良粉砂土试样,对其进行了无侧限抗压强度试验、扫描电镜(SEM)与X射线衍射(XRD)测试,并与水硬性石灰改良粉砂土进行对比分析.结果表明:随着偏高岭土掺量的增加,改良粉砂土破坏应变增大,无侧限抗压强度提高,但强度增长率呈现先增加后减小的规律,并在偏高岭土掺量为4%时达到峰值;当养护龄期从7d增至28d时,石灰偏高岭土改良粉砂土的强度增长率明显高于石灰改良粉砂土.采用6%石灰+4%偏高岭土、8%石灰+4%偏高岭土可分别有效替代8%、10%的水硬性石灰;偏高岭土掺入后形成的水化产物可联结土颗粒并填充于孔隙,使改良粉砂土微观结构更加密实,具有一定的水硬性.

    Abstract:

    Taking typical silty soil in Henan area as the research subject, modified silty soil samples with different lime and metakaolin contents were prepared. Unconfined compressive strength tests, scanning electron microscopy(SEM) and X ray diffraction(XRD) tests were carried out, and the comparison analysis was made with the hydraulic lime modified silty soil. The results show that with the increase of metakaolin content, the failure strain and unconfined compressive strength of the modified silty soil increase, but the strength growth rate increases first and then decreases, which reaches the peak value when the metakaolin content is 4%. When the curing age increases from 7d to 28d, the strength growth rate of lime metakaolin modified silty soil is significantly higher than that of lime modified silty soil. 6% lime +4% metakaolin and 8% lime +4% metakaolin can effectively replace 8% and 10% hydraulic lime respectively. The hydration products formed after the incorporation of metakaolin can bond soil particles and fill in the pores, which makes the microstructure of the improved silty soil more compact and has certain hydraulicity.

    参考文献
    [1]任克彬,王博,李新明,等.毛细水干湿循环作用下土遗址的强度特性与孔隙分布特征[J].岩土力学,2019,40(3):962 970.
    REN Kebin,WANG Bo,LI Xinming,et al.Strength properties and pore size distribution of earthen archaeological site under dry wet cycles of capillary water[J].Rock and Soil Mechanics,2019,40(3):962 970.(in Chinese)
    [2]ARIZZI A,VILES H,CULTRONE G.Experimental testing of the durability of lime based mortars used for rendering historic buildings[J].Construction and Building Materials,2012,28(1):807 818.
    [3]张云升,王晓辉,肖建强,等.古建水硬性石灰材料的制备与耐久性能[J].建筑材料学报,2018,21(1):143 149.
    ZHANG Yunsheng,WANG Xiaohui,XIAO Jianqiang,et al.Preparation and durability of hydraulic lime used as repairing materials for architectural heritage[J].Journal of Building Materials,2018,21(1):143 149.(in Chinese)
    [4]李最雄,赵林毅,孙满利.中国丝绸之路土遗址的病害及PS加固[J].岩石力学与工程学报,2009,28(5):1047 1054.
    LI Zuixiong,ZHAO Linyi,SUN Manli.Deterioration of earthen sites and consolidation with PS material along silk road of China[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):1047 1054.(in Chinese)
    [5]李黎,赵林毅,王金华,等.我国古代建筑中两种传统硅酸盐材料的物理力学特性研究[J].岩石力学与工程学报,2011,30(10):2120 2127.
    LI Li,ZHAO Linyi,WANG Jinhua,et al.Research on physical and mechanical characteristics of two traditional silicate materials in Chinese ancient buildings[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(10):2120 2127.(in Chinese)
    [6]MARAVELAKI K P,BAKOLAS A,KARATASIOS I,et al.Hydraulic lime mortars for the restoration of historic masonry in concrete[J].Cement and Concrete Research,2005,35(8):1577 1586.
    [7]SILVA B A,FERREIRA PINTO A P,GOMES A.Natural hydraulic lime versus cement for blended lime mortars for restoration works[J].Construction and Building Materials,2015,94:346 360.
    [8]朱绘美,徐德龙,刘文欢.古建筑修复用熟石灰性能优化及机理研究[J].建筑材料学报,2017,20(6):902 908.
    ZHU Huimei,XU Delong,LIU Wenhuan.Properties optimization of hydrated lime used in ancient building restoration and its mechanism[J].Journal of Building Materials,2017,20(6):902 908.(in Chinese)
    [9]PAVLK V,UKOV M.Effect of curing conditions on the properties of lime,lime metakaolin and lime zeolite mortars[J].Construction and Building Materials,2016,102:14 25.
    [10]吴子龙,朱向阳,邓永锋,等.掺入钢渣与偏高岭土水泥改性土的性能与微观机制[J].中国公路学报,2017,30(9):18 26.
    WU Zilong,ZHU Xiangyang,DENG Yongfeng,et al.Behavior and micro mechanism of cement based modified compaction soil composed of steel slag and metakaolin[J].China Journal of Highway and Transport,2017,30(9):18 26.(in Chinese)
    [11]宋彦军,周振君.石灰偏高岭土修复性砂浆的研究进展[J].世界科技研究与发展,2017,39(1):39 44.
    SONG Yanjun,ZHOU Zhenjun.Research progress of lime metakaolin restoration mortars[J].World Sci Tech R & D,2017,39(1):39 44.(in Chinese)
    [12]GAMEIRO A,SILVA A S,VEIGA R,et al.Hydration products of lime metakaolin pasters at ambient temperature with ageing[J].Thermochimica Acta,2012,553(9):36 41.
    [13]彭小芹,曹春鹏,季晓丽,等.防水剂对石灰偏高岭土修补砂浆性能的影响[J].湖南大学学报(自然科学版),2016,43(6):83 88.
    PENG Xiaoqin,CAO Chunpeng,JI Xiaoli,et al.Effect of water repellent admixtures on repair mortars made of lime and metakaolin[J].Journal of Hunan University(Natural Sciences),2016,43(6):83 88.(in Chinese)
    [14]谈云志,柯睿,陈君廉,等.偏高岭土石灰增强水泥固化淤泥的耐久性研究[J].岩土力学,2020,41(4):1146 1152.
    TAN Yunzhi,KE Rui,CHEN Junlian,et al.Enhancing durability of lime cement solidified sludge with metakaolin[J].Rock and Soil Mechanics,2020,41(4):1146 1152.(in Chinese)
    [15]刘春龙,刘乃飞,刘奉银,等.偏高岭土改善灰土强度的试验研究[J].西安建筑科技大学学报(自然科学版),2019,51(2):206 211.
    LIU Chunlong,LIU Naifei,LIU Fengyin,et al.Study on the strength of lime soil improved by metakaolin[J].Journal of Xian University of Architecture & Technology(Natural Science),2019,51(2):206 211.(in Chinese)
    [16]谈云志,胡焱,曹玲,等.偏高岭土协同石灰钝化红黏土水敏性的机制[J].岩土力学,2020,41(7):2207 2214,2282.
    TAN Yunzhi,HU Yan,CAO Ling,et al.Mechanism of metakaolin and lime modification of water sensitivity for compacted laterite[J].Rock and Soil Mechanics,2020,41(7):2207 2214,2282.(in Chinese)
    [17]汤怡新,刘汉龙,朱伟.水泥固化土工程特性试验研究[J].岩土工程学报,2000,22(5):549 554.
    TANG Yixin,LIU Hanlong,ZHU Wei.Study on engineering properties of cement stabilized soil[J].Chinese Journal of Geotechnical Engineering,2000,22(5):549 554.(in Chinese)
    [18]赫文秀,申向东.掺砂水泥土的力学特性研究[J].岩土力学,2011,32(增刊1):392 396.
    HAO Wenxiu,SHEN Xiangdong.Mechanical behavior of soil sand cement admixture[J].Rock and Soil Mechanics,2011,32(Suppl 1):392 396.(in Chinese)
    [19]乔春雨,倪文,王长龙.较大偏高岭土掺量下偏高岭土水泥硬化浆体性能与微观结构[J].建筑材料学报,2015,18(3):393 399.
    QIAO Chunyu,NI Wen,WANG Changlong.Properties and microstructure of metakaolin(MK) cement hardened slurry with high use level of MK[J].Journal of Building Materials,2015,18(3):393 399.(in Chinese)
    引证文献
    网友评论
    网友评论
    分享到微博
    发 布
引用本文

李新明,路广远,张浩扬,尹松,任克彬.石灰偏高岭土改良粉砂土强度特性与微观机理[J].建筑材料学报,2021,24(3):648-655

复制
分享
文章指标
  • 点击次数:256
  • 下载次数: 81
  • HTML阅读次数: 0
  • 引用次数: 0
历史
  • 收稿日期:2020-01-07
  • 最后修改日期:2020-04-22
  • 在线发布日期: 2021-07-02
文章二维码