Performance assessment of a newly developed and highly stable grouting material for a completely weathered granite dam foundation

Jiang, Huangbin; Qiu, Xiang

doi:10.1016/j.conbuildmat.2021.123956

Cited by 20 publications

(5 citation statements)

References 30 publications

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“…This section was designed to improve the activity of mineral admixtures by means of sulfate activation. Since the low calcium content of fly ash was not conducive to the establishment and development of mechanical properties [ 54 ], the calcium content of the cementitious material was increased by compounding with slag in this paper. The cementing material was weighed and ground in the ratio of 40:60:6:3 for fly ash: slag: gypsum: sodium sulfate [ 55 , 56 ], and the ground powder was named as H1.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Mechanical Properties of Low Carbon Cementitious Materials with Superfine Cement Reverse Filling High-Volume Mineral Admixtures

2023

Materials

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In order to increase the content of mineral admixtures in cement, this study proposes a method for preparing a high-volume mineral admixture cementitious material (HMAC) using superfine cement as a reverse filling material. Firstly, superfine cement is prepared through mechanical grinding. Then, the activity of mineral admixtures (such as slag and fly ash) is enhanced by mechanical grinding, sulfate activation, and alkali activation methods. Meanwhile, the evolution of HMCM from microstructure to macroscopic mechanical behavior is studied by combining a laser particle size analyzer and a scanning electron microscope. Furthermore, the reverse filling mechanism of superfine cement on mineral admixtures under different activation conditions is proposed. Results show that superfine cement can largely improve the utilization rate of cement clinker and the compressive strength of cementitious materials. In the condition that the compressive strength is not lower than that of the control group (without mineral admixture), the content of mineral admixture can be increased to 50%, 70%, and 90% after mechanical grinding, sulfate activation, and alkali activation, respectively. Analysis indicates that the reverse filling effect of superfine cement is the main reason for improving the density of the HMCM.

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Section: Methodsmentioning

confidence: 99%

Preparation and Mechanical Properties of Low Carbon Cementitious Materials with Superfine Cement Reverse Filling High-Volume Mineral Admixtures

2023

Materials

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“…Polyvinyl alcohol, or PVA, is a type of polymer with good water solubility that deforms well and has good toughness once it has gelled into a film. The PVA solution and cement liquid mix well, creating a gel film with good plasticity that also protects the cement from corrosion and increases the durability and crack resistance of the stone body [30][31][32].…”

Section: Effect Of Polyvinyl Alcohol Concentration On Gelation Timementioning

confidence: 99%

Experimental Study on Performance of Modified Cement-Based Building Materials under High-Water-Pressure Surrounding Rock Environment

et al. 2023

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Traditional cement-based grouting materials have good reinforcement and anti-seepage effects on the surrounding rock under normal conditions, but the grouting effect is not ideal due to problems such as a long setting time, a low stone ratio, and poor crack resistance under high water pressure and in a dynamic water environment. In this study, we aimed to improve the physical properties, chemical properties, and microstructure of a cement-based slurry by forming a hydrogel through its chemical crosslinking with polyvinyl alcohol and boric acid as modifiers for the purpose of improving the permeability resistance of the surrounding rock grouting under high-water-pressure conditions, which can expand the function of traditional building materials. The grouting effect of the modified cementitious material on the surrounding rock was analyzed through indoor tests, the SEM testing of the performance of the modified slurry, the numerical calculation of the seepage field, and the application of the modified slurry in combination with the actual project to verify the water-plugging effect. The research findings demonstrate that (1) the additives boric acid and PVA can significantly speed up the slurry gel time, and the gel time can be controlled within 2–20 min to meet the specification requirements. (2) At a velocity of moving water > 1 m/s, the retention of the solidified modified slurry stone body reaches more than 80%. According to the SEM analysis, the structure of the solidified modified slurry stone body is dense and has good impermeability. (3) According to the numerical calculation analysis, the modified slurry can effectively change the seepage field of the surrounding rock and improve its seepage resistance. The water pressure outside the lining is reduced by 47%, 31%, and 22%, respectively, compared with no slurry, the pure cement slurry, and cement–water-glass grouting, and the indoor test and numerical simulation conclusions are consistent.

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“…Dam leakage is the most important factor in a dam failure disaster chain [ 4 ]. Currently, leakage sealing measures of embankment dams mainly include geosynthetics covering seepage interception, front bumping slope cultivation, the throwing of soil and rock, grouting, and the pouring of underwater non-dispersed concrete [ 5 , 6 , 7 , 8 , 9 , 10 ]. These methods have been used in practical engineering projects for many years and have achieved some desirable results.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Underwater Melting Process and Leakage Plugging Performance of Phase-Change Materials

Zhang,

Tang,

et al. 2024

Materials

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Leakage is a high-incidence disease of embankment dams, and efficiently addressing this disease guarantees the safe operation of dams. Underwater leakage self-priming plugging technology is a new technology that utilizes the melting and solidifying characteristics of phase-change materials and the negative pressure in the leakage entry area to accurately plug the leakage. However, little is yet known about the underwater melting process of phase-change materials and how their characteristics influence the plugging effect. In this study, three kinds of phase-change materials, namely, paraffin, rosin, and stearic acid, were used to conduct underwater leakage self-priming plugging tests, observe and analyze the underwater melting process, and compare the plugging effects. The results showed that the underwater melting process of phase-change materials exhibited different plugging window periods depending on their melting points, specific heat capacities, and mobilities, which were the main factors affecting their plugging effects. In the final plugging stage, paraffin had the best plugging effect, but the material strength was low; rosin had good plugging compactness, but the fluidity performance was poor, and the material effective utilization was low; stearic acid had a low melting point but dispersed easily. Therefore, a blocking material with a suitable blocking window period can be produced by adjusting the material properties accordingly for an improved blocking effect.

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Performance assessment of a newly developed and highly stable grouting material for a completely weathered granite dam foundation

Cited by 20 publications

References 30 publications

Preparation and Mechanical Properties of Low Carbon Cementitious Materials with Superfine Cement Reverse Filling High-Volume Mineral Admixtures

Preparation and Mechanical Properties of Low Carbon Cementitious Materials with Superfine Cement Reverse Filling High-Volume Mineral Admixtures

Experimental Study on Performance of Modified Cement-Based Building Materials under High-Water-Pressure Surrounding Rock Environment

Analysis of Underwater Melting Process and Leakage Plugging Performance of Phase-Change Materials

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