Development of effective microfine cement-based grouts (EMCG) for porous and fissured strata

2020 ◽  
Vol 262 ◽  
pp. 120775
Author(s):  
Fei Sha ◽  
Qing Jin ◽  
Peng Liu
Keyword(s):  
Microfine Cement

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.

Dynamic properties of microfine cement grouted sands

2012 ◽  
Vol 42 ◽  
pp. 17-31 ◽  
Author(s):  
I.A. Pantazopoulos ◽  
D.K. Atmatzidis
Keyword(s):  
Dynamic Properties ◽  
Microfine Cement

scholarly journals Examining efficient assisting geotechnology for permeation grouting of ultra microfine cement for soil liquefaction countermeasure

2016 ◽  
Vol 4 (5) ◽  
pp. 97-100 ◽  
Author(s):  
Weihong Wang ◽  
Kazuyoshi Hashimoto ◽  
Taichi Hyodo ◽  
Yoshimichi Tsukamoto ◽  
Shusuke Oji ◽  
...  
Keyword(s):  
Soil Liquefaction ◽  
Permeation Grouting ◽  
Microfine Cement

Penetrability of microfine cement grouts: experimental investigation and fuzzy regression modeling

2015 ◽  
Vol 52 (7) ◽  
pp. 868-882 ◽  
Author(s):  
Ioannis N. Markou ◽  
Dimitrios N. Christodoulou ◽  
Basil K. Papadopoulos
Keyword(s):  
Injection Pressure ◽  
Fuzzy Regression ◽  
Test Results ◽  
Penetration Length ◽  
Injection Process ◽  
Ordinary Regression ◽  
Microfine Cement ◽  
Cement Grouts ◽  
Microfine Cements ◽  
Sand Grain Size

One-dimensional injection tests were conducted on sand columns with a height of 134 cm for the penetrability evaluation of microfine cement grouts. Three ordinary cement types were pulverized to obtain microfine cements having nominal maximum grain sizes of 20 and 10 μm, and these cements were used in the present investigation. Suspensions with water to cement (W/C) ratios of 1, 2, and 3, by weight, were injected into 13 clean sands with d15 ranging from 0.17 to 2.25 mm and Cu ranging from 1.19 to 6.67. Pulverization of the ordinary cements to produce microfine cements extends the range of groutable sands to “medium-to-fine”. Cement fineness; suspension W/C ratio and apparent viscosity; and sand grain size, gradation, and relative density are very important parameters, as they substantially affect both grout penetration and maximum injection pressure. The penetration length of cement grouts was correlated to parameters pertinent to the suspension, sand, and injection process by performing fuzzy and ordinary linear regression analyses of the injection test results. The resultant fuzzy regression models provided successful penetration length predictions for the majority of the cases analyzed, while the best ordinary regression model exhibited a correlation coefficient not higher than 0.363.

Étude de la pénétrabilité du coulis de ciment microfin sous pression dans les structures de maçonnerie dégradées à caractère historique : effet d'un agent colloïdal

2000 ◽  
Vol 27 (4) ◽  
pp. 642-654 ◽  
Author(s):  
Danielle Palardy ◽  
Stéphanie Perret ◽  
Gérard Ballivy ◽  
Robert Laporte
Keyword(s):  
Structural Integrity ◽  
Cement Grout ◽  
Public Works ◽  
Second Phase ◽  
Masonry Structures ◽  
Flow Rates ◽  
The Past ◽  
Microfine Cement ◽  
The Stability ◽  
Rideau Canal

Several masonry structures, built over the past centuries, have to be restored to ensure their structural integrity and their conservation. Important research and development projects have been initiated by Public Works and Government Services Canada to rehabilitate some of these structures, such as the Rideau canal locks, by using a cement-based grouting technique. By following grouting pressures and flow rates, the stability of the structure is protected and the efficiency to fill openings is assured by using microfine cement-based grouts with admixtures. However, cement grout penetration cannot be observed with precision during the injection. The project described in this paper presents the grouting treatment of a Rideau canal lock sill wall that had to be demolished and reconstructed. The penetration of two different grout mixes was observed by removing the front row of blocks, piece by piece. A second phase of this study was conducted in the laboratory to compare the penetration of different grouts in a reconstructed granular material which simulated the lock's interior walls.Key words: restoration, masonry, grouting, groutability, cement grout, colloidal agent.

Triaxial Compression Testing of Microfine Cement Grouted Sands

2012 ◽  
Author(s):  
I. A. Pantazopoulos ◽  
I. N. Markou ◽  
D. K. Atmatzidis ◽  
A. I. Droudakis
Keyword(s):  
Triaxial Compression ◽  
Compression Testing ◽  
Microfine Cement
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