Research on Portland Cement Grouting Material in Sandy Pebble Soil

2019 ◽  
Vol 11 (7) ◽  
pp. 1027-1036
Author(s):  
Junfu Lu ◽  
Senlin Ling ◽  
Xun Wang ◽  
Xiaoqiang Li ◽  
Dagang Liu
Keyword(s):  
Portland Cement ◽  
Cement Grouting ◽  
Grouting Material

Study on Microfine Cement Grouting Material for Silty Fine Sand Stratum

2013 ◽  
Vol 838-841 ◽  
pp. 1457-1462
Author(s):  
Chun Lei Xia ◽  
Ying Ye ◽  
Guan Ming Wang ◽  
Li Cui
Keyword(s):  
Portland Cement ◽  
Particle Diameter ◽  
Fine Sand ◽  
Cement Grouting ◽  
Grouting Material ◽  
Soluble Glass ◽  
Microfine Cement ◽  
Sand Flow ◽  
Sand Stratum ◽  
Grouting Materials

Silty fine sand is the second smallest sand with a particle diameter ranging from 0.0625 to 0.120 mm.This kind of sand exists in a large amount in Beijing subway excavation project. Due to the poor self-stabilization of this stratum,seeping , sand flow and collapse take place frequently. Grouting materials such as Portland cement and soluble glass (also called sodium silicate) are employed in most of excavation projects to reinforce this sand stratum. However, the reinforcement is not effective, leading to a large amount of accidents in the process of construction. The reason may be attributed to the fact that Portland cement is unable to penetrate into the stratum and the strength of soluble glass (0.6MPa) is too weak to resist the stratum pressure. To solve this problem, a modified microfine cement grouting material able to penetrate into silty fine sand stratum is developed in this paper. A combination of suspension and diluent is used to increase the penetration extension of the grouts,and the experimental results reveal that the addition of the mixture of suspension and diluent in microfine cement grouting materials improves the penetration property substantially.

Study of Rheological Properties of Carbon Nanotube-Reinforced Ultrafine Cement Grouting Materials

2021 ◽  
pp. 1-44
Author(s):  
Yunxiao Liu ◽  
Jiahang Zhang ◽  
Yinyin Chi
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Polyvinyl Pyrrolidone ◽  
Cement Grouting ◽  
Grouting Material ◽  
Multi Walled Carbon Nanotubes ◽  
Different Diameters ◽  
Grouting Materials ◽  
Walled Carbon Nanotubes ◽  
Ultrafine Cement

In this study, three different diameters of multi-walled carbon nanotubes (MWCNTs) dispersed by polyvinyl pyrrolidone (PVP) were used to reinforce superfine cement grouting materials. The effect of MWCNTs and polyvinyl pyrrolidone (PVP) on the rheological properties of grouting material were accordingly studied. It was found that the yield stress (τ0) and plastic viscosity (η) were slightly decreased when PVP content was low and increased when the PVP content increased. The effect of MWCNT diameter on τ0 was not found to be clear but was more significant on η. The smaller MWCNT diameter was, the more quickly η increase. It was also found that the thixotropic ring area was increased as the MWCNTs content increased. The addition of PVP and MWCNTs caused an increase in the number of entanglement points in different scales, which was the main reason for the viscosity and thixotropy increase. Therefore, the rheological properties of superfine cement grouting material should be adjusted when MWCNTs were added as a reinforcing component. Due to the wrapping of PVP on cement particles which isolates the contacting part between the water and the cement particles, it slows down the cement's hydration rate thus slows down the fluidity loss of the slurry.

scholarly journals High-Fluidization, Early Strength Cement Grouting Material Enhanced by Nano-SiO2: Formula and Mechanisms

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6144
Author(s):  
Jiaolong Ren ◽  
Zedong Zhao ◽  
Yinshan Xu ◽  
Siyuan Wang ◽  
Haiwei Chen ◽  
...  
Keyword(s):  
Functional Requirements ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Rapid Repair ◽  
Nano Sio2 ◽  
Civil Infrastructures ◽  
Cement Grouting ◽  
Grouting Material ◽  
Early Strength ◽  
Grouting Materials

Cement grouting material is one of the most important materials in civil construction at present, for seepage prevention, rapid repair, and reinforcement. To achieve the ever-increasing functional requirements of civil infrastructures, cement grouting materials must have the specific performance of high fluidization, early strength, and low shrinkage. In recent years, nanomaterials have been widely used to improve the engineering performance of cement grouting materials. However, the mechanisms of nanomaterials in grouting materials are not clear. Hence, a high-fluidization, early strength cement grouting material, enhanced by nano-SiO2, is developed via the orthogonal experimental method in this study. The mechanisms of nano-SiO2 on the microstructure and hydration products of the HCGA, in the case of different curing ages and nano-SiO2 contents, are analyzed through scanning electron microscopy tests, X-ray diffraction tests, differential scanning calorimetry tests, and Fourier transform infrared spectroscopy tests.

A pasty clay–cement grouting material for soft and loose ground under groundwater conditions

2017 ◽  
Vol 29 (2) ◽  
pp. 54-62 ◽  
Author(s):  
Guijin Zhang ◽  
Jie Liu ◽  
Yi Li ◽  
Jingwei Liang
Keyword(s):  
Cement Grouting ◽  
Grouting Material

Ultrafine Portland cement grouting performance with or without additives

2014 ◽  
Vol 19 (7) ◽  
pp. 2041-2050 ◽  
Author(s):  
Murat Mollamahmutoğlu ◽  
Eyübhan Avci
Keyword(s):  
Portland Cement ◽  
Cement Grouting

Research on Durability Performance of Novel Double Solution Grouting Material with Metakaolin

2011 ◽  
Vol 250-253 ◽  
pp. 722-727 ◽  
Author(s):  
Chao Yan ◽  
Qing Jun Ding ◽  
Jian Ping Xu ◽  
Hong Xi Wang
Keyword(s):  
Corrosion Resistance ◽  
Portland Cement ◽  
Water Glass ◽  
Structural Model ◽  
Gelation Time ◽  
Aqueous Dispersion ◽  
Cementitious Materials ◽  
Grouting Material ◽  
Grouting Materials ◽  
Resistance Performance

At the present, Portland cement-water glass double solution grouting materials have many problems, such as the instability of gelation time and of products, and poor groundwater-corrosion resistance performance, etc. A way to improve the performances of double solution grouting materials was studied by adding metakaolin into the systems. Based on the rapid gelation performance of Portland cement-water glass and the durability of alkali-activated salic cementitious materials, an ideal structural model of the novel anti-aqueous dispersion and anti-aqueous dissolution grouting material (AAGM) was established. Series of experiments were prepared to verify the Na+ solidification and water-corrosion resistance performance of the metakaolin-water glass double solution grouting materials which combined with cement. The results indicated that the compact structure of AAGM was composed of a dominant ingredient of (Na,Ca)-Si-Al-H zeolite gel and a minor part of C-S-H. Moreover, it was shown that the AAGM had hydrated product of low solubility and compact microstructure tested by Fourier transform infrared spectra (FTIR) and transmission electron microscopy (SEM), which proved the well anti-aqueous dispersion and anti-aqueous dissolution performance.

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