早期CO2养护与Nano-TiO2协同作用下低热水泥基浆体的力学性能
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1.新疆农业大学水利与土木工程学院;2.新疆水利工程安全与水灾害防治重点实验室

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TU528

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新疆维吾尔自治区杰出青年基金(2022D01E44)


Mechanical properties of low-heat cement-based paste upon early CO2 curing and nano-TiO2 synergistic effect
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1.College of Hydraulic and Civil Engineering;2.Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention

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    摘要:

    为探究早期CO2养护和纳米TiO2 (Nano-TiO2,NT) 协同作用对低热硅酸盐水泥 (Low-Heat Portland Cement,LHPC) 力学性能的影响规律,测试了不同CO2养护时间和NT掺量下LHPC的抗折、抗压强度,并结合扫描电镜、热重分析等测试结果分析其对力学性能的协同作用机制。结果表明:仅考虑掺入NT或CO2养护,NT掺量或CO2养护时间均存在最佳范围。CO2养护与NT协同作用下,CO2养护24 h内,LHPC浆体在14 d和28 d龄期的抗压、抗折强度分别在NT掺量为1% ~ 1.5%和1.5% ~ 2%时提升幅度大,这归因于试样中C-S-H、AFt和CaCO3质量增加,长径比较小的纤维状C-S-H细化了大于50 nm的孔径。而CO2养护超过24 h、NT掺量大于2%时,试样中孔隙数量增加、较大长径比的晶须状文石和微观裂缝的产生降低了力学性能。综合力学强度和经济性,

    Abstract:

    To explore the roles of the synergistic effects of CO2 curing and Nano-TiO2 (NT) on the mechanical properties of Low-Heat Portland Cement (LHPC), the flexural and compressive strengths of LHPC were tested during various CO2 curing times and NT dosages. The influence mechanisms were analyzed using testing methods such as scanning electron microscopy and thermogravimetric analysis. The results indicate that there is an optimal range for the NT dosage and CO2 curing time when considering only the addition of NT or CO2 curing. During the synergistic effect of CO2 curing and NT, the compressive and flexural strengths of the LHPC pastes cured with CO? within 24 h significantly increased at 14 and 28 d when the NT dosage was 1% to 1.5% and 1.5% to 2%, respectively. This is attributed to the increased masses of C-S-H, AFt, and CaCO3 in the samples, as well as the refinement of pore sizes greater than 50 nm by fibrous C-S-H with a smaller length-to-diameter ratio. Conversely, when CO2 curing exceeded 24 h and the NT dosage was greater than 2%, the mechanical properties were reduced due to an increase in the number of pores, the formation of whisker-like aragonite with larger length-to-diameter ratios, and the generation of micro-cracks in the samples. Based on the comprehensive mechanical strength and economy, it is recommended that the curing time for CO2 is 12 h, and the dosage of NT is 1%. This study provides a reference for improving the early mechanical properties of LHPC.

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吴豪,谢刚川,宫经伟,等. 早期CO2养护与Nano-TiO2协同作用下低热水泥基浆体的力学性能[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-11
  • 最后修改日期:2024-05-21
  • 录用日期:2024-05-21
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