密封技术是压缩空气储能(compressed air energy storage,CAES)人工硐室储气库建设的关键技术之一,其密封材料的选择至关重要。为了验证聚氨酯类聚合物砂浆(polyurethane polymer mortar,PPM)作为CAES人工硐室储气库密封材料的可行性,对...密封技术是压缩空气储能(compressed air energy storage,CAES)人工硐室储气库建设的关键技术之一,其密封材料的选择至关重要。为了验证聚氨酯类聚合物砂浆(polyurethane polymer mortar,PPM)作为CAES人工硐室储气库密封材料的可行性,对PPM进行了气体渗透性试验和力学试验,分析其气密性能和强度与变形性能,并利用FLAC^(3D)软件分析了PPM密封层结构的受力特性与气体泄漏率。结果表明:PPM具有极佳的气密性能,其本质渗透率量级可达到10^(-20)~10^(-22) m^(2),可满足CAES密封层的密封要求。PPM的拉伸性能优异,弹性模量低,变形能力强,与混凝土之间具有自黏能力。当PPM本质渗透率为10^(-19) m^(2)时,储气库渗漏量为0.215%,满足1 d内空气质量允许泄漏率的要求。由于PPM的弹性模量低,使得PPM密封层的计算环向应力均表现为压应力;最大环向拉应变仅有1.15%~1.20%,远小于其极限拉伸应变,可有效防治密封层产生拉伸破坏。由此可见,PPM在气渗和力学指标上均可满足CAES密封材料的性能要求。展开更多
Sporosarcina pasteurii was employed as the strain,with an in-situ magnetization construction,to obtain magnetic microorganisms and oriented self-healing mortar specimens based on them.The magnetic field was used to ac...Sporosarcina pasteurii was employed as the strain,with an in-situ magnetization construction,to obtain magnetic microorganisms and oriented self-healing mortar specimens based on them.The magnetic field was used to achieve the directional migration of magnetic microorganisms during the oriented selfhealing of mortar cracks,improving the rate of self-healing of cracks.The experimental results demonstrate that the magnetic microorganisms are composed of Fe_(3)O_(4)nanosheets attached to the surface of Sporosarcina pasteurii,whose mineralization products are comprised of vaterite primarily.Compared with the pure microbial group,the magnetic microbial group exhibits a faster repair rate,shortening the repair time required to achieve an area repair efficiency of over 90%from 28 days to 14 days,thereby doubling the repair rate.Meanwhile,the area repair efficiency of the magnetic microbial group at 7,14,and 28 days are increased by 50.3%,11.2%,and 4.6%,respectively,compared to the pure microbial group,which are due to the magnetic microorganisms'superior directional migration and mineralization ability,exceeding that of the ordinary microorganisms.展开更多
文摘密封技术是压缩空气储能(compressed air energy storage,CAES)人工硐室储气库建设的关键技术之一,其密封材料的选择至关重要。为了验证聚氨酯类聚合物砂浆(polyurethane polymer mortar,PPM)作为CAES人工硐室储气库密封材料的可行性,对PPM进行了气体渗透性试验和力学试验,分析其气密性能和强度与变形性能,并利用FLAC^(3D)软件分析了PPM密封层结构的受力特性与气体泄漏率。结果表明:PPM具有极佳的气密性能,其本质渗透率量级可达到10^(-20)~10^(-22) m^(2),可满足CAES密封层的密封要求。PPM的拉伸性能优异,弹性模量低,变形能力强,与混凝土之间具有自黏能力。当PPM本质渗透率为10^(-19) m^(2)时,储气库渗漏量为0.215%,满足1 d内空气质量允许泄漏率的要求。由于PPM的弹性模量低,使得PPM密封层的计算环向应力均表现为压应力;最大环向拉应变仅有1.15%~1.20%,远小于其极限拉伸应变,可有效防治密封层产生拉伸破坏。由此可见,PPM在气渗和力学指标上均可满足CAES密封材料的性能要求。
基金Funded by the National Key R&D Program of China(No.2023YFC3806100)the National Nature Science Foundation of China(Nos.52278269,52278268,52178264,and 52108238)+2 种基金the Tianjin Outstanding Young Scholars Science Fund Project(No.22JCJQJC00020)the Key Project of Tianjin Natural Science Foundation(No.23JCZDJC00430)the Joint Research Center of China and Foreign Countries Special Fund of Tianjin Innovation Platform(No.24PTLYHZ00240)。
文摘Sporosarcina pasteurii was employed as the strain,with an in-situ magnetization construction,to obtain magnetic microorganisms and oriented self-healing mortar specimens based on them.The magnetic field was used to achieve the directional migration of magnetic microorganisms during the oriented selfhealing of mortar cracks,improving the rate of self-healing of cracks.The experimental results demonstrate that the magnetic microorganisms are composed of Fe_(3)O_(4)nanosheets attached to the surface of Sporosarcina pasteurii,whose mineralization products are comprised of vaterite primarily.Compared with the pure microbial group,the magnetic microbial group exhibits a faster repair rate,shortening the repair time required to achieve an area repair efficiency of over 90%from 28 days to 14 days,thereby doubling the repair rate.Meanwhile,the area repair efficiency of the magnetic microbial group at 7,14,and 28 days are increased by 50.3%,11.2%,and 4.6%,respectively,compared to the pure microbial group,which are due to the magnetic microorganisms'superior directional migration and mineralization ability,exceeding that of the ordinary microorganisms.
