Quantitative determination of composition of quaternary cementitious materials

Liu, Shuyan; Shi, Caijun; Wang, Dehui; Xiao, Jiangfan

doi:10.1007/s11595-014-0914-7

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…The red mud used in the test was selected from the Bayer red mud produced by Guangxi Pingguo Aluminium Industry, with a particle size of 0.005-0.075 mm and a density of 2.75 g/cm 3 . Red mud is a waste product of bauxite extraction from alumina industrial production and is known as red mud because of its high content of Fe 2 O 3 and because its appearance is similar to that of the red-coloured mud; some red mud is brown due to the low content of Fe 2 O 3 , instead containing a large amount of CaO [23,24]. Red mud is a highly alkaline solid waste, usually with a pH > 11.0, which is polluting and is pretreated before use.…”

Section: Methodsmentioning

confidence: 99%

Experimental Research on the Performance Characteristics of Grouting Slurry in a High-Ground-Temperature Environment

Yang,

Niu,

Sun

et al. 2023

Buildings

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Grouting materials with good thermal insulation and reinforcement properties are the key factors in solving the temperature control problems of high geothermal tunnels using curtain grouting, as the existing grouting materials are unable to take into account the working performance and thermal insulation properties of high-temperature environments. In view of the above problems, this paper configures a high geothermal tunnel red-mud-based grouting material (RMGS) using red mud, carries out tests on the working performance (viscosity, setting time, and compressive strength) and thermal insulation performance (thermal conductivity and specific heat capacity) of the grouting materials at different temperatures (20, 40, 60, and 80 °C), and analyses the variation rules and micro-mechanisms of the various properties at different temperatures. The results show that the increase in temperature will accelerate the viscosity development and condensation of the grouting material and will also lead to the acceleration of the attenuation of the thermal conductivity of the three types of grouting material and the reduction in specific heat capacity. In addition, the appropriate temperature can improve the compressive strength of the material. The increase in temperature will accelerate the hydration reaction speed of the grouting material and will also lead to the development of the internal pore space of the material, which affects the macroscopic properties of the material and is the reason for the effect of the temperature on the performance of the grouting material. In terms of application, the cement slurry is suitable for grouting in a static water environment, the cement–water glass bi-liquid slurry is suitable for grouting in a dynamic water environment, and the RMGS is suitable for grouting in a high-ground-temperature environment.

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Section: Methodsmentioning

confidence: 99%

Experimental Research on the Performance Characteristics of Grouting Slurry in a High-Ground-Temperature Environment

Yang,

Niu,

Sun

et al. 2023

Buildings

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“…The performance of TSL is between shotcrete and wire mesh. Compared with shotcrete, TSL has the advantages of a short maintenance cycle, fast application, high tensile strength, good bonding performance, prevention of rock mass loosening, significant ability to penetrate joints, cleanliness, and easy transportation in rock reinforcement [1][2][3][4][5][6][7][8][9]. Compared with traditional rock support methods, TSL can penetrate into large cracks of the surrounding rock with its excellent flowability, and gradually fill the capillary cracks of the surrounding rock.…”

Section: Introductionmentioning

confidence: 99%

Repairing Performance of Polymer-Modified Cement-Based Thin Spray-On Liners on Pre-Cracked Rock-like Specimens

Teng,

Yu,

Wang

et al. 2024

Coatings

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With the development of coal mining and the increase in excavation depth, the stress on roadway surrounding rock is also increasing. This creates conditions for crack development in the roadway, so it is urgent to develop rock repair materials with excellent performance. The ability of thin spray-on liner (TSL) to repair rock and concrete opens up the possibility of reusing abandoned roadways. The ability of TSL to support the surrounding rock is also important in preventing the generation of roadway waste. In this paper, styrene–acrylic emulsion (SAE), vinyl acetate–ethylene copolymer emulsion (VAE), and polyvinyl alcohol powder (PVA) were used to prepare three TSLs. Rock-like materials were configured using cement mortar according to similar principles. Three types of TSLs were tested for basic properties such as viscosity and mechanical strength, which provided data to support the explanation of the repair performance of TSLs. Three TSLs were used to repair pre-cracked rock-like specimens (PR). The number of brushing times and the angle of PR’s cracks were regarded as test variables. Changes in the mechanical strength of repaired PRs were tested by compressive and flexural tests. TSL repair performance was evaluated with the help of mechanical strength changes. Results show that polyvinyl alcohol powder modified cement-based thin spray-on liner is most suitable for repairing rock cracks; as the thickness of the brush slurry increases, its repair performance continues to improve. This paper can provide experience and a theoretical basis for the research of other rock repair materials, and it is also instructive for repairing shotcrete in the roadway.

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“…In the "visual landscape", the subject is human and the object is the landscape elements. The form and quantity of the elements have a significant impact on landscape perception [8,9]. The evaluation process of visual landscape quality is also a process of comparative analysis of the aesthetic perception of different landscape spaces [6,10].…”

Section: Introductionmentioning

confidence: 99%

The Relation between Green Visual Index and Visual Comfort in Qingdao Coastal Streets

Sun

Gao

et al. 2023

Buildings

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The public’s mental health is obviously impacted by the perception of green quantity in urban streets. As one of the important urban spatial indicators, the Green View Index (GVI) reflects the green quantity of streets, which is helpful in revealing the level of street vegetation from the perspective of pedestrians. The GVI can improve the attraction and the visual experience in urban streets. Taking Qingdao Coastal Streets as an example, the study used OpenStreetMap, Baidu Street View (BSV) image, DeepLabV3+ semantic segmentation, and the SD method to obtain the GVI and Visual Comfort (VICO), and the correlation and influence mechanisms were discussed. The result showed that the greening landscape of the overall Qingdao Coastal Streets was of high quality, and the historic district was the most outstanding. The greening quality was a little low in the transitional district and the western modern district, which should be improved. In addition, the relationship between GVI and VICO showed a strong positive correlation. The spatial distribution of the VICO was more consistent with the GVI. The street VICO was affected by the GVI, plant richness, the street scale, and landscape diversity. Moreover, with the increase of the GVI, the increase trend of the VICO instead gradually decreased. The contribution of this study was not only accurately diagnosing the problems of street greening quality, shedding light on the relationship between GVI and VICO, but also providing theoretical support for urban greening planning and management, especially for healthy street design.

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Quantitative determination of composition of quaternary cementitious materials

Cited by 5 publications

References 7 publications

Experimental Research on the Performance Characteristics of Grouting Slurry in a High-Ground-Temperature Environment

Experimental Research on the Performance Characteristics of Grouting Slurry in a High-Ground-Temperature Environment

Repairing Performance of Polymer-Modified Cement-Based Thin Spray-On Liners on Pre-Cracked Rock-like Specimens

The Relation between Green Visual Index and Visual Comfort in Qingdao Coastal Streets

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