Evaluation of the grout injectability and types of resistance to grout flow

Jorne, Fernando; Henriques, Fernando

doi:10.1016/j.conbuildmat.2016.06.032

Cited by 42 publications

(12 citation statements)

References 21 publications

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“…The criteria cited in this section were originally proposed for different soils, but from our experimental data, we have seen that microannuli have the same issues in terms of penetrability (void/aperture size distribution and connectivity (Jorne and Henriques, 2016 ). This finding does not mean that some of the microfine cements tested could fill some apertures partially, but they would not fill and completely repair the microannuli.…”

Section: Grain Size/void Ratiosmentioning

confidence: 86%

“…Several factors affecting the penetrability of the cement, the most relevant of which are the water/cement ratio and the ratio between the opening size and the grain size of the cement (Axelsson et al, 2009;Jorne and Henriques, 2016;Mirza et al, 2013). With regard to the latter, the generally accepted "rule of thumb" is that the aperture to be filled must be at least three times the grain size of the cement (Mitchell, 1981); this is claimed as a general rule in several reviews (Axelsson et al, 2009;Tolppanen and Syrjänen, 2003).…”

Section: Sealing Materials Performancementioning

confidence: 99%

“…The actual repair could be compromised by a low conductivity section. Both problems have been described in detail (Jorne and Henriques, 2016).…”

Section: Sealing Materials Performancementioning

confidence: 99%

See 2 more Smart Citations

Characterization of wellbore microannuli

Fernandez

Matteo

Taha

et al. 2019

Journal of Natural Gas Science and Engineering

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Section: Grain Size/void Ratiosmentioning

confidence: 86%

Section: Sealing Materials Performancementioning

confidence: 99%

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Characterization of wellbore microannuli

Fernandez

Matteo

Taha

et al. 2019

Journal of Natural Gas Science and Engineering

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“…For these tests, high water/binder ratio of 1.24 was applied constantly due to the high water demand of the air lime and to the use of pozzolans [32,44]. Several characteristics of the porous media were determined (Table 3): (a) parameters d(90) and d (10), which are respectively the diameter through which 90% and 10% of the total mass pass; (b) the total porosity, which was evaluated by measuring the volume of water which could be filled inside each cylinder, to know the available voids inside the column; and (c) the water absorption of the travertine. Table 3.…”

mentioning

confidence: 99%

Combination of Polymeric Superplasticizers, Water Repellents and Pozzolanic Agents to Improve Air Lime-Based Grouts for Historic Masonry Repair

et al. 2020

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This paper presents the experimental procedure to develop air lime-based injection grouts, including polymeric superplasticizers, a water repellent agent and pozzolanic agents as additives. Our research focuses on the development of grouts to improve various characteristics simultaneously by combining different additions and admixtures. Aiming to improve the injectability of the grouts, in this study, different polymeric superplasticizers were added, namely polycarboxylated-ether derivative (PCE), polynaphthalene sulfonate (PNS) and condensate of melamine-formaldehyde sulfonate (SMFC). As a water-repellent agent, sodium oleate was used to reduce the water absorption. The enhancement of the strength and setting time was intended by using microsilica and metakaolin as pozzolanic mineral additions. Compatibility between the different admixtures and action mechanism of the different polymers were studied by means of zeta potential and adsorption isotherms measurements. Diverse grout mixtures were produced and investigated by assessing their injectability, fluidity, stability, compressive strength, hydrophobicity and durability. This research led to several suitable mixtures produced by using more than one component, to enhance efficiency and to provide better performance of grouts. According to the results, the grout composed of air lime, metakaolin, sodium oleate and PCE was found to be the most effective composition, improving the mechanical strength, injectability and hydrophobicity.

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“…Researchers have carried out a series of studies on grouting materials [1][2][3], grouting mechanism and diffusion evolution against seepage through indoor experiments and theoretical analysis. In particular, Warner et al [4] used compaction grouting to mitigate the sinkholes at WAC Bennett dam, showing satisfactory reinforcement effect.…”

Section: Introductionmentioning

confidence: 99%

Anti-Seepage Effectiveness Evaluation of Fracture Grouting in Yellow River Embankment

Liu¹,

Wan²,

Xie³

et al. 2018

Preprint

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Abstract：Fracture grouting has been a widely used mitigation measure against seepage in the Yellow River Embankment. However, there is currently a lack of systematic investigation for evaluating the anti-seepage effectiveness of fracture grouting employed in this longest river embankment in China. Therefore, in this work, laboratory and in-situ experiments are carried out for investigating the reinforcement effect of fracture grouting in the Jinan Section of the Yellow River Embankment. In particular, firstly, the laboratory tests concentrate on studying the optimum strength improvement for cement-silicate grout by varying the content of backfilled fly ash and bentonite as admixtures. Flexural strength and Scanning Electron Microscope photographs are investigated for assessing the strength and compactness improvement. Subsequently, based on the obtained optimum admixtures content, in-situ grouting tests are carried out in the Jinan Section of the Yellow River Embankment to evaluate the anti-seepage effectiveness of fracture grouting, where geophysical prospecting and pit prospecting methods are employed. Laboratory results show that, compared with pure cement-silicate grouts, the gelation time of the improved slurry is longer and gelation time increases as fly ash content increases. The optimum mixing proportion of the compound cement-silicate grout is 70% cement, 25% fly ash and 5% bentonite, and the best volume ratio is 2 for the investigated cases. Geophysical prospecting using the Ground Penetrating Radar and High Density Resistivity methods can reflect the anti-seepage effectiveness of fracture grouting on site. It shows that the grouting material mainly flows along the axial direction of the embankment. The treatment that is used to generate directional fracture is proved to be effective. The injection hole interval distance is suggested to be 1.2 m, where the lapping effect of the grouting veins is relatively significant. For the investigated cases, the average thickness of the grouting veins is approximately 6.0 cm and the corresponding permeability coefficient is averagely 1.6 × 10 −6 cm/s, which meets the anti-seepage criterion in practice.

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Evaluation of the grout injectability and types of resistance to grout flow

Cited by 42 publications

References 21 publications

Characterization of wellbore microannuli

Characterization of wellbore microannuli

Combination of Polymeric Superplasticizers, Water Repellents and Pozzolanic Agents to Improve Air Lime-Based Grouts for Historic Masonry Repair

Anti-Seepage Effectiveness Evaluation of Fracture Grouting in Yellow River Embankment

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