Mechanical and thermal properties of aluminate cement paste with blast furnace slag at high temperatures

Cheng, Xiaowei; Dong, Qinghai; Ma, Yao; Zhang, Chi; Gao, Xianshu; Yu, Youming; Wen, Zhang; Zhang, Chunmei; Guo, Xiaolu

doi:10.1016/j.conbuildmat.2019.116747

Cited by 40 publications

(16 citation statements)

References 39 publications

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“…The hydration products were mainly AH 3 , C 3 AH 6 , CAH 10 and C 2 AH 8 at room temperature. CAH 10 and C 2 AH 8 were chemically unstable, while AH 3 and C 3 AH 6 were relatively stable [19,20]. Therefore, CAH 10 and C 2 AH 8 changed into C 3 AH 6 with the increase of age and temperature.…”

Section: Composition and Microstructurementioning

confidence: 97%

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Xu¹

2021

Ceramics - Silikaty

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Textile reinforced concrete (TRC) was prepared from high-alumina cement mixed with short-cut basalt fiber or steel fiber for the objective to analyze the mechanical performance and deterioration mechanism at high temperature. The results show that the high-temperature resistance of TRC matrix concrete can be improved by adding steel fibers and basalt fibers, but the compressive strength of concrete decreases with the increase of temperature in a quadratic parabolic law, while the flexural strength decreases in a linear law. The addition of basalt fiber significantly improves the bending bearing capacity of the TRC plates. In comparison, the addition of steel fiber significantly improves the flexural strength of TRC thin-plates above 600 °C. The scanning electron microscopy indicates that when the temperature surpasses 600 °C, the addition of basalt fiber and the steel fiber surface are significantly damaged by high-temperature deterioration. The deterioration of the mechanical performance of TRC thin-plates at high temperatures is caused mainly by changes in the chemical composition of the concrete matrix, deterioration of the fiber and damage of the bonding surface. The results obtained in this study can provide the theoretical support for the design and application of TRC in a high-temperature environment.

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Section: Composition and Microstructurementioning

confidence: 97%

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Xu¹

2021

Ceramics - Silikaty

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“…At present, the main ideas for increasing the production of heavy oil are to reduce the viscosity of the heavy oil, increase the permeability of the reservoir, and increase the production pressure difference, and one of the most commonly used techniques is to increase the oil recovery. 1 The main technologies are thermal recovery technologies such as steam injection thermal recovery and oil formation burning. 2 The production process of steam injection thermal recovery is shown in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Graphite-Oil Well Cement Composites under High Temperature

2022

Self Cite

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Under the condition of heavy oil thermal recovery, the cement sheath is easy to crack in the high temperature environment, resulting in the decrease of cement paste strength, which may further cause sealing failure and oil and gas production safety accidents. In this paper, the influence of graphite on the mechanical properties of cement paste under the simulated thermal recovery of heavy oil was studied, and its mechanism is explored by testing and analyzing the microstructure. The phase composition and microstructure of graphite–cement composites were determined by X-ray diffraction analysis (XRD) and scanning electron microscope (SEM), and the thermogravimetric analyzer (TG/DTG) was used to analyze the heat resistance of the graphite–cement composites. The results show that the addition of graphite significantly improved the strength and deformation resistance of the Class G oil well cement at high temperature (300, 400, and 500 °C) and low temperature (50 °C), and the optimal addition amount is 0.07%. The microscopic analysis shows that the incorporation of graphite promoted the formation of hydration products, and played a role in filling pores and reducing microcracks in cement pastes. At the same time, due to the better thermal conductivity of graphite, it can balance the internal thermal stress of the cement pastes and inhibit the strength decline of cement pastes under high temperature environments. The integrity of cement pastes was guaranteed through the mechanism of “crack deflection” and “crack bridging”. The research results of this paper have presented a certain theoretical basis and new ideas for the development of cementing slurry systems in heavy oil thermal recovery wells.

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“…The curing temperature of the CAC hydration products and its structure are vital roles. Recent research on CAC have reported (Goberis and Antonovich, 2004;Ukrainczyk and Matusinović, 2010;Kırca et al, 2013;Pacewska et al, 2013) that temperatures used are mostly in the range of 20-70 °C and few experiments have been performed on CAC paste curing at 300-350 °C. In recent years, research on CAC has mostly focused on hydration characteristics and fracture toughness, using slag as an auxiliary cementing material to improve the mechanical performance of CAC (Amin et al, 2012;Cheng et al, 2019), and often perform collaborative analysis with concrete (Wang et al, 2021a;Wang et al, 2021b;Huang et al, 2021). Therefore, research on the resistance performance of CAC in hot and humid environments at high temperatures has great significance.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Calcium Aluminate Cement Containing Blast Furnace Slag at 50°C and 315°C

Wu¹,

Liu²,

Xiong³

et al. 2022

Front. Mater.

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During the thermal recovery of heavy oil thermal recovery wells, improving the mechanical properties and integrity of the cement ring is of great significance for the safe and efficient exploitation of heavy oil resources. This paper studies the relative properties of calcium aluminate cement and three kinds of slags under the conditions of 50°C × 1.01 MPa and 315°C × 20.7 MPa. CAC-slag composite material performance was evaluated using the cement paste compressive strength and permeability tests to study the physical properties of CAC with blast furnace slag. X-ray diffraction analysis, scanning electron microscopy (SEM), and thermal analysis (DSC/TG) were carried out to investigate the mineralogical composition of CAC with blast furnace slag. Results show that adding blast furnace slag did not affect the performance of cement slurry. Moreover, C2ASH8 curing occurred at low temperature, the microstructure of CAC paste was compact, and the permeability resistance was improved, thus improving the low-temperature properties of neat CAC. When cured at a high temperature, the CAC paste was mainly hydrated with C3ASH4 and AlO(OH), which had a well-developed crystal structure. Adding blast furnace slag can improve the CAC resistance to high temperature.

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Mechanical and thermal properties of aluminate cement paste with blast furnace slag at high temperatures

Cited by 40 publications

References 39 publications

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Mechanical Properties of Graphite-Oil Well Cement Composites under High Temperature

Improvement of Calcium Aluminate Cement Containing Blast Furnace Slag at 50°C and 315°C

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