Performance of Novel Chemical Grout in Treating Sands

Mollamahmutoğlu, Murat; Avcı, Eyubhan; Tomaç, Sercan Kerem; Köse, Dursun Ali

doi:10.1061/(asce)mt.1943-5533.0002004

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…According to the reaction equation, in the addition reaction stage (Equation 3), urea reacts with formaldehyde water, generating hydroxymethyl urea and dihydroxymethyl urea in the case of the weak base. Then, the oxalic acid reacts with the hydroxymethyl urea and dihydroxymethyl urea according to Equations (4) and (5), respectively, to produce acidic solution. In the acidic condition, various polymethylenes are produced to achieve solidification.…”

Section: Chemical Reaction Of Grout Componentsmentioning

confidence: 99%

“…Grout flowing through the soil and fracture network within the rock mass are similar to the flow of fluid (or gas) through rock fracture networks [1][2][3][4]. Chemical grouts can penetrate tiny pores in some dense but weak sand layers, where conventional Portland cement grouts are likely to fail [5,6], although cement-based grouts are more widely used [7][8][9]. In recent years, many experimental results on the mechanical behaviors of grouted sand using chemical grouts have been achieved.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Mechanical Behaviors of Grouted Sand with UF-OA Grouts

et al. 2018

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A detailed understanding of the engineering properties for grouted sand is a key concern in foundation engineering projects containing sand layers. In this research, experiments of grouting with various grain sizes of sand specimens using a new type of improved chemical material-urea formaldehyde resin mixed with oxalate curing agent (UF-OA), which has rarely been used as grout in the reinforcement of soft foundations, were conducted on the basis of a self-developed grouting test system. After grouting tests, the effects on the mechanical behaviors of grouted sand specimens were investigated through uniaxial compression tests considering the grain size, the presence or absence of initial water in sand, and the curing time for grouted sand. Experimental results show that with the increase in the grain size and the presence of initial water in the sand specimen, the values of uniaxial compressive strength (UCS) and elastic moduli (E) of the grouted specimens decreased obviously, indicating that the increase of grain size and the presence of initial water have negative impacts on the mechanical behaviors of grouted sand; the peak strains (ε c) were almost unchanged after 14 days of curing; no brittle failure behavior occurred in the grouted specimens, and desirable ductile failure characteristics were distinct after uniaxial compression. These mechanical behaviors were significantly improved after 14 days of curing. The micro-structural properties obtained by scanning electron microscopy (SEM) of the finer grouted sand indicate preferable filling performance to some extent, thereby validating the macroscopic mechanical behaviors.

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Section: Chemical Reaction Of Grout Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Mechanical Behaviors of Grouted Sand with UF-OA Grouts

et al. 2018

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“…e cement-based grout is widely available, but its poor grout ability is due to high viscosity and weak durability and limited its practical applications in engineering to some extent [8][9][10]. us, many efforts were made to improve the cement-based materials by chemical approach, such as adding urethanes, acrylates, lignans, and resins [11][12][13][14][15][16][17][18]. In recent years, fly ash has been recognized as a favorable additive for the cementbased grout to enhance the flowability and durability of grouting materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mixture Ratio and Diffusion Performance of Grouting Materials for Water Bursting Prevention in Coal Mines

Lian

Dai

et al. 2021

Advances in Materials Science and Engineering

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Grouting is a common and important technique for water bursting prevention in coal mines; the success of grouting in coal mines depends highly on the flowability of grouting materials and the strength of the hardened body as well. In this paper, a series of performance tests, in terms of the water-cement ratio, viscosity, drainage rate, presetting time, final setting time, compressive strength, and permeability were conducted on the cement-fly ash-based grout at various mixture ratios. The evolution of these performances versus different mixture ratios was analyzed; targeting at the reasonable flowability and hardened strength of grouting materials, an optimized mixture ratio was recognized for water bursting prevention in coal mines. Furthermore, the diffusion experiments of optimized grout material were designed taking into account the influence of confining and hydraulic pressure in the porous medium. As a result, the confining and hydraulic pressures have a linear negative correlation with the diffusion distance of grout materials. These results have guiding significance to water bursting prevention in coal mines.

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Effect of Acrylate-Cement Grout on the Unconfined Compressive Strength of Silty Sand

et al. 2019

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Performance of Novel Chemical Grout in Treating Sands

Cited by 9 publications

References 7 publications

Experimental Investigation of the Mechanical Behaviors of Grouted Sand with UF-OA Grouts

Experimental Investigation of the Mechanical Behaviors of Grouted Sand with UF-OA Grouts

Experimental Investigation on the Mixture Ratio and Diffusion Performance of Grouting Materials for Water Bursting Prevention in Coal Mines

Effect of Acrylate-Cement Grout on the Unconfined Compressive Strength of Silty Sand

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