腐蚀与冻融耦合作用下对纤维石膏基胶凝材料耐久性能的影响
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1.甘肃第七建设集团股份有限公司;2.兰州理工大学土木工程学院;3.西安五和土木工程新材料有限公司

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TU526

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国家自然科学基金(51968043)


Effect of Corrosion and Freeze-thaw Coupling on the Durability of Fiber Gypsum Based Cementified Materials
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Gansu Seventh Construction Group Co., Ltd

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    摘要:

    为探究纤维石膏基胶凝材料的耐久性能,本试验将高强石膏、粉煤灰和矿渣按照44:34:22的比例,通过掺杂聚丙烯纤维和苎麻纤维制成纤维石膏基胶凝材料,使用甲基硅酸钠对纤维石膏基胶凝材料进行防水处理,探究在 H2SO4或NaOH腐蚀与冻融耦合作用下,冻融5 d、15 d、25 d、45 d、90 d对纤维石膏基胶凝材料软化性能、吸水率和质量损失率的影响。对纤维石膏基胶凝材料进行了冻融应变检测,抗折及抗压强度检测,工业CT(computed tomography)检测。研究表明:纤维可以减少石膏基胶凝材料在冻融时的弹性和塑性变形;在酸碱腐蚀与冻融耦合作用下,NaOH 比H2SO4对纤维石膏基胶凝材料的损伤更大;使用浸泡甲基硅酸钠作防水处理的纤维石膏基胶凝材料,经过90d冻融后,对比不做防水处理的试件,提高了0.28和0.13的抗折和抗压软化系数,降低了1.56%和9.52%的吸水率和质量损失率;随着冻融次数增加,试件孔隙开展仍以小孔为主,裂隙直径主要为0.1~2 mm。

    Abstract:

    In order to investigate the durability of fiber gypsum-based cementation material, a composite material was prepared by incorporating polypropylene and ramie fibers into high-strength gypsum, fly ash, and slag in a ratio of 44:34:22. Sodium methylsilicate was utilized for waterproofing the fiber gypsum-based cementitious material, and the effects of freeze-thaw cycles on its softening property, water absorption, and mass loss were studied after 5, 15, 25, 45, and 90 days under the combined action of H2SO4 or NaOH corrosion and freeze-thaw. Freeze-thaw strain testing, flexural and compressive strength testing, as well as industrial CT (computed tomography) scanning were conducted. The results indicate that fibers can mitigate both elastic and plastic deformation of the gypsum-based cementitious material during freeze-thaw cycles. Furthermore, under the combined effect of acid-base corrosion and freeze-thaw cycles, NaOH causes greater damage than H2SO4 does. After undergoing 90 days of freeze-thaw cycling with sodium methylsilicate treatment applied to it ,the flexural and compressive softening coefficients increased by 0.28 and 0.13 respectively compared to specimens without waterproofing; meanwhile water absorption rates decreased by 1.56% while mass loss rates decreased by9 .52%. As freezing-and thawing times increase,pore development in specimens is still dominated by small holes,and crack diameters are mainly between0 .1~2 mm.

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张宏权,任鹏武,李晓东,等. 腐蚀与冻融耦合作用下对纤维石膏基胶凝材料耐久性能的影响[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-22
  • 最后修改日期:2024-06-23
  • 录用日期:2024-07-09
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