Influence of CaO-based expansive agent, superabsorbent polymers and curing temperature on pore structure evolution of early-age cement paste

Zhao, Haitao; Li, Xiaolong; Xie, Dong-shen; Di, Yunfei; Huang, Jie; Xu, Wen; Wang, Peng-gang; Zuo, Junqing

doi:10.1007/s11771-022-4957-1

Cited by 7 publications

(2 citation statements)

References 37 publications

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“…(1) High Expansive Force during Hydration . Heat generation powders, primarily composed of CaO, function as non-explosive expansive or fracturing agents extensively used in mining and civil engineering. , Upon complete hydration, CaO powder expands to 1.96 times its original volume, exerting a substantial expansive force (up to 21 MPa). This force facilitates the creation of interconnected microcracks in rocks and concrete structures. − …”

Section: Resultsmentioning

confidence: 99%

Feasibility Analysis on Hydrate Exploitation by Heat Generation Powders Thermal Stimulation

Zhang,

Ji,

Yang

et al. 2024

Energy Fuels

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A rigorous study was conducted to assess the potential of a novel “in situ heat generation method using heat generation powders” for natural gas hydrate (NGH) exploitation. This method was evaluated based on its ability to accelerate NGH decomposition through efficient heating. The experiment meticulously examined the impact of heat generation powders thermal stimulation (HPTS) on gas extraction from hydrate-bearing sediments (HBSs) at temperatures of 14 and 8 °C. Key parameters, such as gas production, temperature variations, energy efficiency, and thermal efficiency, were closely monitored throughout the NGH exploitation process. The study documented the cementation of HBS, where hydration products bonded loose sand grains after hydrate decomposition. Additionally, it provided a comprehensive overview of the five major mechanisms of heat generation powders: in situ heat supply, high expansion force, cementation, porosity enhancement, and increased pore volume. Gas production was feasible at both 14 and 8 °C, with the in situ hydration reaction at 14 °C demonstrating greater intensity, leading to higher average gas production rates, rapid cementation of loose sand grains, and reduced hydration and exploitation durations. HPTS effectively mitigated temperature disturbances, fostering a safer and more stable environment for NGH exploitation. Notably, the energy efficiency (η) and thermal efficiency (ξ) of HPTS surpassed those of traditional thermal stimulation methods at both HBS temperatures. At 8 °C, HPTS exhibited superior η and ξ, reaching values of 13.255 and 0.8109, respectively, thus offering substantial advantages over conventional methods. Post-experiment observations revealed that hydration products facilitated the cementation of all loose sand particles in Reservoir 1 and a portion in Reservoir 2, forming visually striking cemented cores. The findings underscored HPTS’s ability to deliver favorable gas production, improved heat transfer, and exceptional HBS cementation. With three hydration heat regulation methods, the hydration heat for heating the reservoir skeleton is expected to be further reduced, increasing the proportion of hydration heat consumed in hydrate decomposition, thereby enhancing heat utilization efficiency and achieving higher η. In conclusion, the HPTS method demonstrates significant promise at HBS temperatures of 14 and 8 °C, with the potential to drive sustainable development and foster environmentally friendly production practices.

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Section: Resultsmentioning

confidence: 99%

Feasibility Analysis on Hydrate Exploitation by Heat Generation Powders Thermal Stimulation

Zhang,

Ji,

Yang

et al. 2024

Energy Fuels

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“…However, concrete has the disadvantage of frequent cracking due to shrinkage. Several efforts have been made to overcome these weaknesses, including using ice water, additives to reduce shrinkage, and expansive type additives (Zhao, et al (2022) and Kim JK (2001)).…”

Section: Introductionmentioning

confidence: 99%

Effect of Using Different Types of Additives Against the Compressive Strength of Cement Paste

et al. 2022

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Cement as the main construction material is used for concrete, mortar and cement paste. Some problems with the use of cement are caused by shrinkage, cracking, so that these problems can reduce the compressive strength. This study analyzed the use of additives in overcome the weakness of cement paste. There are three types of additives used, namely, Intraplast Z, Cebex 100 and J-Additive. The percentages of additive use are 0.36%, 0.48%, 0.6% and 0.72% by weight of cement. The test object is a cube measuring 50 x 50 x 50 mm. The compressive strength test on cement paste was carried out at the age of 3, 7, 14 and 28 days. The results showed that for Intraplast Z and Cebex 100 the optimum percentage was 0.36% which resulted in an increase in compressive strength of 18% and 28%, respectively. As for the J-additive, there was an increase of 50% at a percentage of 0.36%. The benefits of the research resulted in the optimal percentage so that the use of additives became more efficient.

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Effect of pH-Responsive Superabsorbent Polymers on the Self-Healing of Cement-Based Materials

Yang,

Zhang,

Niu

2024

Iran J Sci Technol Trans Civ Eng

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Influence of CaO-based expansive agent, superabsorbent polymers and curing temperature on pore structure evolution of early-age cement paste

Cited by 7 publications

References 37 publications

Feasibility Analysis on Hydrate Exploitation by Heat Generation Powders Thermal Stimulation

Feasibility Analysis on Hydrate Exploitation by Heat Generation Powders Thermal Stimulation

Effect of Using Different Types of Additives Against the Compressive Strength of Cement Paste

Effect of pH-Responsive Superabsorbent Polymers on the Self-Healing of Cement-Based Materials

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