The compatibility of bentonite/sepiolite plastic concrete cut-off wall material

Abbaslou, Hakime; Ghanizadeh, Ali Reza; Amlashi, Amir Tavana

doi:10.1016/j.conbuildmat.2016.08.116

Cited by 59 publications

(16 citation statements)

References 22 publications

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“…(6) e exhaust valve was closed after the discharge of grout from the exhaust valve at the base, the grout diffusion and pressure changes in the sleeve were observed, and grouting was stopped when the designed grouting volume was reached. e grouting volume, soil porosity, and density were 3.12 kg, 49%, and 1.5 g/cm 3 , respectively. (7) e mold was removed at 1 d after grouting, and the treated soil in the mold was maintained at room temperature.…”

Section: Test Methodsmentioning

confidence: 99%

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An Experimental Study on the Reinforcement of Silt with Permeable Polyurethane by Penetration Grouting

Wang

Liu

Guo

et al. 2020

Advances in Civil Engineering

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To meet the demand of antiseepage and reinforcement of soil dams, a kind of permeable polyurethane grouting material was developed. A visual steady-pressure grouting test device was designed to study the law of polyurethane diffusion and reinforcement in silt under different pressure, and the interaction mechanism of grout and soil body structure was explored microscopically. The results showed that, with the increase in the grouting pressure, the diffusion speed rose, and the diffusion pattern of grout in the soil also changed from permeation diffusion to permeation splitting. Under the effect of grouting pressure, more tiny cracks will occur in the soil structure, leading to the use of more grout, thus increasing the strength of the consolidated soil by more than 10 times. The results of SEM-EDS and mercury intrusion test proved that the polyurethane had a significant filling effect on the soil structure, which could effectively reduce the porosity of the soil and cement the soil particles through wrapping, complexing, and hydrogen bonding, thereby improving the soil properties. Moreover, the results revealed from a microscopic perspective that the grouting altered the pore structure of the soil structure through the seepage-erosion-splitting coupling effect, but when the grouting pressure exceeded 0.4 MPa, the soil particle and grout would be partially remixed and arranged closely, showing a phenomenon of jet grouting. Finally, the material was used in engineering practice, achieving a satisfactory grouting treatment effect.

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Section: Test Methodsmentioning

confidence: 99%

“…e traditional antiseepage and reinforcement methods of dams include concrete cutoff walls [2,3], cement-soil mixing piles [4], and high-pressure jet grouting [5]. However, these methods require a long construction period, with a low construction efficiency and greater disturbance to the dam.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Reinforcement of Silt with Permeable Polyurethane by Penetration Grouting

Wang

Liu

Guo

et al. 2020

Advances in Civil Engineering

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“…[4] The wall is made of a special concrete called "plastic concrete", which is mechanically compatible with the dam's structure. [5,6] The cutoff wall materials must be capable of resisting the deformations imposed by dam settlement and the wall's weight itself along with horizontal and vertical deformations due to horizontal loadings like earthquake loads and periodic loads due to the operation of dam reservoir. [7,8] Construction of the first cutoff walls was conducted through Tangent Piles, Sheet Piles and T-shaped Piles.…”

Section: Literature Reviewmentioning

confidence: 99%

Construction and Monitoring of Cement/Bentonite Cutoff Walls: Case Study of Karkheh Dam, Iran

Faridmehr

YazdaniPour²,

Jokar³

et al. 2019

Studia Geotechnica Et Mechanica

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Water seepage is one of the most important features of embankment dams. To prevent and reduce seepage, it is necessary to seal the dam. Plastic concrete cutoff walls are one of the most efficient methods in waterproofing the foundation of embankment dams on permeable alluvial substrates. Sufficient resistance to loads, low permeability to maintain dam sealing, high ductility compatible with the foundation and deformation under load without cracking are the main requirements in plastic concrete cutoff walls. In this paper, the construction and implementation of the cutoff wall of Karkheh Dam, which is one the world's largest water sealing projects, was studied. In addition, a numerical model using Seep-3D software was developed to evaluate the efficiency of the cut-off wall to decrease the seepage over the dam's foundation. The numerical results validated by instrumentation statistics resulted from 17-years dam operation. According to the results, after the drainage of the reservoir, the cutoff wall optimally reduced the hydraulic gradient by 0.08 from 2.35 and the water leakage by 3.1 m/s from 18.3 m/s.

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“…There are two nat u ral ra dio active sources: cosmogenic radionuclides and pri mor dial radionuclides. Cosmogenic radionuclides ( 3 H, 7 Be, 14 C, 22 Na, etc.) are pro duced as a re sult of the in ter actions of cos mic-ray par ti cles in the at mo sphere [1].…”

Section: Introductionmentioning

confidence: 99%

“…Re cently, sepio lite min er als have been stud ied ex ten sively be cause it is a very im por tant group of min er als with a huge num ber of in dus trial ap pli ca tions [6][7][8][9][10][11]. How ever, ac cord ing to our lit er a ture re search, there is no study about the radionuclide con tents of sepio lite sam ples un til now.…”

Section: Introductionmentioning

confidence: 99%

Radiometric properties of sepiolite minerals from quarries in central Anatolia of Turkey

et al. 2019

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Sepio lite is a nat u rally oc cur ring clay min eral of sed i men tary or i gin and is a mag ne sium hydrosilicate. Sepio lite has been widely used as an ad di tive raw ma te rial in ce ram ics and cement in dus try, phar ma ceu ti cal, clean ing-de ter gent, pa per, paint, cos metic ag ri cul ture, fer tilizer, etc. In this study, the nat u ral ra dio ac tiv ity lev els, ra don em a na tion co ef fi cients and ra don ex ha la tion rates of 30 sepio lite sam ples col lected from open three sepio lite quar ries (Beylikova, Polath and Sivrihisar) in Cen tral Anatolia re gion of Tur key were de ter mined by us ing a gamma-ray spec trom e try with an HPGe de tec tor. The av er age ab sorbed gamma dose rates di rectly mea sured in Beylikova, Polath and Sivrihisar open three sepio lite quar ries located in Cen tral Anatolia re gion of Tur key were found as 59, 65, and 64 nGyh-1 , re spec tively. The av er age ac tiv ity con cen tra tions of 226 Ra, 232 Th, and 40 K in 30 sepio lite sam ples col lected from those quar ries were found as 38.6, 12.4, and 67.4 Bqkg-1 , re spec tively. The av er age ema na tion co ef fi cient and ex ha la tion rate of ra don of sepio lite sam ples were de ter mined as 22 % and 0.065 Bqkg-1 h-1 , re spec tively. Also, ra dio log i cal pa ram e ters (out door ab sorbed gamma dose rate, an nual ef fec tive dose rate, ex ter nal and in ter nal in dex) were es ti mated to eval u ate the use of sepio lite sam ples as ad di tive raw ma te ri als in the build ing sec tor. Key words: sepio lite, nat u ral ra dio ac tiv ity, out door ab sorbed gamma dose rate, ra don em a na tion co ef fi cient, ra don mass ex ha la tion rate, gamma-ray spec trom e try

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The compatibility of bentonite/sepiolite plastic concrete cut-off wall material

Cited by 59 publications

References 22 publications

An Experimental Study on the Reinforcement of Silt with Permeable Polyurethane by Penetration Grouting

An Experimental Study on the Reinforcement of Silt with Permeable Polyurethane by Penetration Grouting

Construction and Monitoring of Cement/Bentonite Cutoff Walls: Case Study of Karkheh Dam, Iran

Radiometric properties of sepiolite minerals from quarries in central Anatolia of Turkey

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