Influencing factors of mechanical and thermal conductivity of foamed phosphogypsum-based composite cementitious materials

Chen, Mingsheng; Liu, Peng; Kong, Dewen; Wang, Yi; Wang, Jingdong; Huang, Yansen; Yu, Ke; Wu, Ningbo

doi:10.1016/j.conbuildmat.2022.128462

Cited by 35 publications

(32 citation statements)

References 31 publications

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“…This is because the large porosity of 0.02% is less than 0.05%. Large porosity exerts a more pronounced effect on thermal conductivity when the porosities are similar [14,15]. Second, GO features good thermal conductivity, which forms a heat transfer network in the cement and boosts the thermal conductivity of the cement.…”

Section: Influence Of Go On the Heat Conductivity Of Cementmentioning

confidence: 99%

Cement-based composites modified by graphene oxide nano-materials: porosity and thermal conductivity

Tian,

Chai,

Cao

2023

J. Phys.: Conf. Ser.

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This study looked into the way graphene oxide (GO) affects the porosity and thermal conductivity of composite materials fabricated from cement. Different concentrations ascribed to GO at 0.02%, 0.05, 0.07, and 0.1% were added to the cement samples (as per cement mass). The porosity showed a trend of first decreasing and then increasing, with the decrease in macroporosity being particularly pronounced. The porosity and thermal conductivity of GO-cement composites were measured. The findings demonstrated by incorporating GO, the thermal conductivity of GO-cement composites was firstly boosted, which later decreased with the largest enhancement at 0.02%. This study holds the promise of providing a basis for GO’s multi-field coupling of cement under multiple enhancements of mechanics, heat conduction, and hydration and contributing significantly to the application of GO.

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Section: Influence Of Go On the Heat Conductivity Of Cementmentioning

confidence: 99%

Cement-based composites modified by graphene oxide nano-materials: porosity and thermal conductivity

Tian,

Chai,

Cao

2023

J. Phys.: Conf. Ser.

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“…Phosphogypsum is a byproduct waste of wet acid production of chemical fertilizer, which is also a type of pollution damaging the ecological environment and human health [7,8]. Notably, certain properties of cementitious materials can be improved after adding phosphogypsum, e.g., mechanical properties and temperature control performance [9][10][11][12][13][14][15]. Therefore, by using it as an additive for engineered cementitious materials, the recycling of phosphogypsum has been realized in the fields of building materials [16,17], road foundation materials [18,19], and offshore well cementing materials [6].…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, phosphogypsum has good mechanical potential due to its strong bonding properties after drying and dehydration processes [9,20], leading to larger compressive strength of PGCs than traditional cementing materials, which is beneficial for wellbore stability under the high pressure conditions of offshore NGH exploitation [21,22]. And great efforts have been made to investigate the mechanical properties of phosphogypsum-based cementitious materials [6,11,12,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…That is, the temperature rise of the formation near the wellbore should be controlled to reduce hydrate dissociation. Since the application of PGCs with better temperature control performance instead of traditional cementing materials can reduce the hydration heat and control the heat transfer from the wellbore to the NGH reservoir outside the wellbore [9,23,25], it consequently decreases the dissociation of hydrates near the wellbore, leading to less undesirable gas channeling and better formation stability. Hence, in addition to their mechanical properties, the temperature control performance of PGCs should also be deeply investigated [9,23].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Thermal and Mechanical Properties of Foamed Phosphogypsum-Based Cementitious Materials for Well Cementing in Hydrate Reservoirs

Tang,

Zhao,

Cheng

et al. 2024

JMSE

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As detrimental byproduct waste generated during the production of fertilizers, phosphogypsum can be harmlessly treated by producing phosphogypsum-based cementitious materials (PGCs) for offshore well cementing in hydrate reservoirs. To be specific, the excellent mechanical properties of PGCs significantly promote wellbore stability. And the preeminent temperature control performance of PGCs helps to control undesirable gas channeling, increasing the formation stability of natural gas hydrate (NGH) reservoirs. Notably, to further enhance temperature control performance, foaming agents are added to PGCs to increase porosity, which however reduces the compressive strength and increases the risk of wellbore instability. Therefore, the synergetic effect between temperature control performance and mechanical properties should be quantitatively evaluated to enhance the overall performance of foamed PGCs for well cementing in NGH reservoirs. But so far, most existing studies of foamed PGCs are limited to experimental work and ignore the synergetic effect. Motivated by this, we combine experimental work with theoretical work to investigate the correlations between the porosity, temperature control performance, and mechanical properties of foamed PGCs. Specifically, the thermal conductivity and compressive strength of foamed PGCs are accurately determined through experimental measurements, then theoretical models are proposed to make up for the non-repeatability of experiments. The results show that, when the porosity increases from 6% to 70%, the 7 d and 28 d compressive strengths of foamed PGCs respectively decrease from 21.3 MPa to 0.9 MPa and from 23.5 MPa to 1.0 MPa, and the thermal conductivity decreases from 0.33 W·m−1·K−1 to 0.12 W·m−1·K−1. Additionally, an overall performance index evaluation system is established, advancing the application of foamed PGCs for well cementing in NGH reservoirs and promoting the recycling of phosphogypsum.

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“…Moreover, the storage of the PG could cause the leakage of contaminants such as sulfates, phosphate ions, trace metals, and radioactive nuclides [5], posing a threat to groundwater. At present, the PG dominates in soil improvement [6][7][8][9][10], construction materials [1,[11][12][13], and as a retarder in cement production [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study on Synergistic Effect of Xanthan Gum and Sodium Methylsiliconate on Mechanical Strength and Water Stability of Phosphogypsum Road-Based Materials

Wu,

Xu,

Chu

et al. 2023

Materials

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To address the issues of low strength, poor water stability, and hazardous substance leaching associated with using phosphogypsum (PG) as a direct road-based material, the traditional approach involves employing inorganic cementing materials to stabilize PG, effectively addressing the problems. This study innovatively utilizes the xanthan gum (XG) and sodium methylsiliconate (SM) as curing agents for PG to solve the above problems. An organic curing agent stabilized PG was prepared by dry mixing XG and PG. The unconfined compressive strength, water stability, and leaching behavior of stabilized PG were investigated, the leaching behavior was characterized by ion leaching concentration, and the mechanisms behind the strength development of stabilized PG were explored by SEM and FTIR. The experimental results indicate that the single incorporation of XG reduced the strength and water stability of stabilized PG, while the single incorporation of SM had a limited effect on strength and water stability. In addition, the dual incorporation of XG and SM significantly improved the strength and water stability of stabilized PG. At the same time, the dual incorporation of XG and SM greatly reduced the leaching of hazardous substances from stabilized PG. These results demonstrate the feasibility of using stabilized PG for road base materials.

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Influencing factors of mechanical and thermal conductivity of foamed phosphogypsum-based composite cementitious materials

Cited by 35 publications

References 31 publications

Cement-based composites modified by graphene oxide nano-materials: porosity and thermal conductivity

Cement-based composites modified by graphene oxide nano-materials: porosity and thermal conductivity

Evaluation of Thermal and Mechanical Properties of Foamed Phosphogypsum-Based Cementitious Materials for Well Cementing in Hydrate Reservoirs

Study on Synergistic Effect of Xanthan Gum and Sodium Methylsiliconate on Mechanical Strength and Water Stability of Phosphogypsum Road-Based Materials

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