Bleeding and Bleeding Measurement of Cement-Based Grout

Draganović, Almir; Stille, Håkan

doi:10.1061/9780784412350.0143

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…In terms of grouting diffusion in rock cracks, Funehag et al [11] used the self-developed crack model system to explore the relationship between the grouting time and the penetration length in smooth cracks under a constant grouting pressure condition. Draganovic et al [12,13] used the smooth steel channel to simulate a flat crack and conducted the grouting test. The variation in grout pressure in the position of crack shrinkage was obtained to indirectly evaluate the filtration phenomenon in this position.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Water-Plugging Performance of Grouted Concrete Crack

Zhang,

Huang,

et al. 2024

Materials

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In this paper, ordinary Portland cement, ultrafine cement, polyurethane, and epoxy resin were selected as typical grouting materials. Grouting simulation tests were first conducted to prepare the grouted concrete crack sample. The effect of concrete crack parameters (i.e., crack aperture and roughness), grout water–cement ratio, and grouting pressure on the water-plugging performance of different grouting materials was explored through the impermeability test. The microstructure of grouted concrete cracks was analyzed by means of scanning electron microscopy (SEM) and computed tomography (CT), and the difference in water-plugging performance of different grouting materials was explained at the micro level. The results show that the impermeability of the four grouting materials was ranked as follows: Epoxy resin > polyurethane > ultra-fine cement > ordinary Portland cement. The concrete cracks grouted by epoxy resin have the highest plugging failure water pressure and the lowest permeability, which is the optimal grouting material. The effectiveness of crack grouting in water-plugging was directly proportional to the grouting pressure, provided the pressure did not exceed a certain value. When the pressure surpassed the threshold, the increase in pressure did not have a significant impact on the water plugging performance. For the two cement-based materials, the threshold pressure was 1 MPa, while for the other two chemical grouts, it was 2 MPa. The two cement-based grouts with a water–cement ratio of 0.8 showed optimal water-plugging performance. The water-plugging performance of ordinary Portland cement paste, ultra-fine cement pastes, and polyurethane grout was negatively correlated with crack aperture and positively correlated with crack roughness. However, the water-plugging performance of epoxy resin grout was not affected by crack aperture or roughness.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Water-Plugging Performance of Grouted Concrete Crack

Zhang,

Huang,

et al. 2024

Materials

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“…If the water-tocement ratio is too low, the loess will absorb the water in the slurry and cause the rheological property to deteriorate, which is not conducive to slurry diffusion. Moreover, if the grouting pressure is low, influenced by the water absorption and the micropore structure of loess, the slurry can easily percolate and filtrate [9], thereby affecting the reinforcement effect. If the grouting pressure is high, the loess can rapidly collapse, which has a negative reinforcement impact.…”

Section: Introductionmentioning

confidence: 99%

Layered Grouting Technology Based on a Comprehensive Water‐to‐Cement Ratio for the Overlying Loess Stratum of Urban Shallow Tunnels

Yang

Zhang

et al. 2020

Advances in Civil Engineering

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Different from sand and clay, loess has special engineering properties; hence, existing soil grouting theories are not suitable for the disaster treatment of shallow loess tunnels. In this study, a fine grouting reinforcement test system was developed, and the Yuhan Road tunnel overlying loess was used as the injection medium. An orthogonal test based on slurry dry density, moisture content, water-to-cement ratio, and grouting pressure was conducted. Results revealed that the loess samples have high integrity after grouting, and the cohesion and compressive strength improved significantly. The stress-strain curve showed that the strengthened samples have greater ultimate and residual strengths than samples before grouting. Through a range analysis, it was determined that water-to-cement ratio and moisture content are the main factors affecting loess cohesion and compressive strength. Therefore, a comprehensive test of the water-to-cement ratio and moisture content as a single variable was conducted. It was found that their influence on loess cohesion and compressive strength is not a single linear relationship but a combined balance. To characterize the joint effect of water in loess and in slurry on reinforcement, the concept of a comprehensive water-to-cement ratio is proposed, and the cohesion and compressive strength curves with respect to this ratio were drawn. An optimal comprehensive water-to-cement ratio, which corresponds to the maximum cohesion or compressive strength, was found. Based on this ratio, we further propose a method to calculate the water-to-cement ratio of slurry and suitable grouting amount for the Yuhan Road tunnel reinforcement project, in which all solution parameters can be measured via field tests. In the project, a surface layered grouting scheme, based on the optimal comprehensive water-to-cement ratio, was designed. After grouting, loess strength was improved significantly, permeability was reduced greatly, and the overall reinforcement effect was suitable; these results provide a reference for similar projects.

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Assessment and mechanism study of bleeding process in cement paste by 1H low-field NMR

Sun

et al. 2015

Construction and Building Materials

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Bleeding and Bleeding Measurement of Cement-Based Grout

Cited by 5 publications

References 7 publications

Experimental Study on Water-Plugging Performance of Grouted Concrete Crack

Experimental Study on Water-Plugging Performance of Grouted Concrete Crack

Layered Grouting Technology Based on a Comprehensive Water‐to‐Cement Ratio for the Overlying Loess Stratum of Urban Shallow Tunnels

Assessment and mechanism study of bleeding process in cement paste by 1H low-field NMR

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