Emperimental study on high toughness cement-based materials modified by silica fume

LI Xiaoqin; ZHOU Xu; LI Shihua; LIU Guoshou

doi:10.11835/j.issn.2096-6717.2021.012

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Emperimental study on high toughness cement-based materials modified by silica fume

Civil Engineering | 更新时间：2022-11-07

- Emperimental study on high toughness cement-based materials modified by silica fume
- Journal of Civil and Environmental Engineering Vol. 44, Issue 6, Pages: 170-180(2022)
- 作者机构：
  
  1.昆明理工大学建筑工程学院，昆明 650500
  2.云南建投绿色高性能混凝土股份有限公司，昆明 650500
- 作者简介：
  
  brief:LI Xiaoqin(1983- ), PhD, associate professor, main research interests: new civil engineering materials and reinforcement and repair of existing structures, E-mail：Xiaoqin.Li@foxmail.com.
- 基金信息：
  
  National Natural Science Foundation of China(51968035);Yunnan Provincial Education Department Science Research Fund(2019J0043);Yunnan Province Key Research and Development Plan(202003AC100001);Yunnan Provincial Transportation Department Science &Technology Fund(2017A-04);Kunming University of Science and Technology Analysis Test Fund(2018M20182210048)
- DOI：10.11835/j.issn.2096-6717.2021.012
  CLC： TU528.32
- Received：17 October 2020，
  
  Published：30 December 2022
- 稿件说明：
移动端阅览
李晓琴,周旭,李世华等.硅灰改性高韧性水泥基材料性能试验研究[J].土木与环境工程学报,2022,44(06):170-180.

LI Xiaoqin,ZHOU Xu,LI Shihua,et al.Emperimental study on high toughness cement-based materials modified by silica fume[J].Journal of Civil and Environmental Engineering,2022,44(06):170-180.
李晓琴,周旭,李世华等.硅灰改性高韧性水泥基材料性能试验研究[J].土木与环境工程学报,2022,44(06):170-180. DOI： 10.11835/j.issn.2096-6717.2021.012.

LI Xiaoqin,ZHOU Xu,LI Shihua,et al.Emperimental study on high toughness cement-based materials modified by silica fume[J].Journal of Civil and Environmental Engineering,2022,44(06):170-180. DOI： 10.11835/j.issn.2096-6717.2021.012.

摘要

工程水泥复合材料（ECC）具有良好的韧性和裂缝控制能力，可用于解决地下和水工工程中的混凝土开裂和渗漏水问题。高水灰比ECC(

w/c

=1.03)流动度好，但抗渗性能差，且水灰比过高使得材料坍落度大、黏聚性差，不满足可喷射性的指标要求。为了解决上述问题，将硅灰（SF）以不同的SF/水泥质量比引入高水灰比ECC中，以改善其工作性能、抗渗性能、微观结构和力学性能。结果表明，当SF/水泥比为15％时，高水灰比ECC的工作性能大大提高，达到新拌材料可泵送及可喷射的指标要求，高水灰比ECC的抗渗性能提高至P8以上；扫描电镜(SEM)和能量分散光谱仪（EDS）的观察结果证实，添加SF使ECC的显微组织更致密，而且还可以减少碱性物质的产生，从而抑制碱集料反应，提高耐久性。对ECC展开韧性、抗渗性及工作性能(可泵送及可喷涂)研究，获得了高韧性、高抗渗、可喷可泵的ECC配合比，为其在实际工程中的推广及应用奠定了基础。

Abstract

Engineering cementitious composites (ECC) have excellent toughness and crack control ability

which can be used in underground and hydraulic engineering solving the problems of concrete cracking and leakage. ECC with high water-cement ratio (

w/c

=1.03) has excellent fluidity

but its impermeability is poor. Meanwhile

the high water-cement ratio also induces large slump and poor cohesiveness

leading poor sprayable abilities. In order to solve the above problems

silica fume (SF) was then introduced into ECC (

w/c

=1.03) with different SF/cement mass ratios to improve its workability

impermeability

microstructure and mechanical behavior. The results indicate that when SF/cement ratio was 15%

the workability of ECC with high water-cement ratio was greatly improved

which could be pumped and sprayed. At the same time

the impermeability of ECC with high water-cement ratio is improved to above P8. The scanning electron microscope （SEM） and energy dispersive spectrometer (EDS) observations confirmed that adding SF made ECC microstructures denser

but also could reduce the alkaline substances to inhibit alkali-aggregate reaction and improve durability. Through the study of toughness

impermeability and workability (pumpable and sprayable) of ECC

the mix proportion of ECC with high toughness

high impermeability

spraying and pumping was obtained

which laid a foundation for the popularization and application in practical engineering.

关键词

Keywords

references

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