国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 外文學(xué)位 >Applications of electricity in the rehabilitation and health monitoring of concrete structures.
【24h】

Applications of electricity in the rehabilitation and health monitoring of concrete structures.

機(jī)譯：電力在混凝土結(jié)構(gòu)修復(fù)和健康監(jiān)測中的應(yīng)用。

獲取原文
獲取原文并翻譯 | 示例
  • 摘要
  • 著錄項
  • 相似文獻(xiàn)
  • 相關(guān)主題

摘要

The dissertation research work presented herein consists of two separate findings: one investigates a potential new coating technique that could be used to rehabilitate deteriorated concrete sewer pipes, and the other researches inducing electrical conductivity into geopolymer concrete to serve as smart material by being able to sense stress changes. Both applications utilize electricity to enhance the performance and/or functionality of hardened cementitious materials.;Microbiologically induced corrosion (MIC) in concrete wastewater conveyance systems is a leading deterioration mechanism in such structures. This work focuses on breaking the MIC cycle by preventing colonization of the bacteria responsible for converting hydrogen sulfide to sulfuric acid. Electrokinetics was used to drive an antimicrobial agent (cuprous oxide) into the porous wall surface of a pre-cast concrete pipe. An electric potential difference applied between the steel reinforcement embedded in the concrete and a copper electrode placed in the coating solution provides the driving force to the copper ions. Atomic absorption tests performed on the coated specimens were used to determine the percentage of cuprous oxide that penetrated the porous surface and migrated into the hardened concrete matrix. A pilot study conducted on three mock pipe specimens demonstrated that the process is effective on partially corroded and non-corroded pipes. Test data also revealed that the amount of copper that migrated into the concrete matrix is time dependent. Based on the preliminary test results, a treatment procedure was designed and implemented on a 15" diameter commercial pre-cast concrete pipe. The data suggest that the method could be reemployed to "immunize" new and partially deteriorated steel reinforced concrete pipes against MIC.;Geopolymer concrete is finding a growing number of niche applications in the field of civil engineering due to its high compressive strength, strength gain rate, fire resistance, maintenance of structural properties in elevated temperature environments, chemical stability in highly acid environments, and relatively low cost and environmental benefits. Electrically conductive geopolymer could serve as a new smart material that could monitor its own health. Typically, health monitoring in structures is done by assessing their state of stress. One such method involves monitoring electrical resistance variations as an indirect indication of the stress variations in the structure. Carbon fibers were added to a fresh geopolymer mix to enhance its electrical conductivity. AC-impedance spectroscopy analysis was performed on sample specimens to obtain their electrical resistance. Results from the preliminary phases demonstrated that geopolymer exhibits superior performance to OPC-made concrete as a conductor of electrical current. Conductive geopolymer concrete specimens containing an optimum percentage of carbon fibers were dynamically loaded to observe the changes in electrical resistance. Data obtained from the dynamic test suggests that conductive geopolymer could serve as a smart material.
機(jī)譯：本文提出的論文研究工作包括兩個獨立的發(fā)現(xiàn)：一個研究了一種潛在的新涂層技術(shù)，該技術(shù)可用于修復(fù)老化的混凝土下水道；另一研究通過感應(yīng)能夠?qū)㈦妼?dǎo)率引入地質(zhì)聚合物混凝土中以用作智能材料壓力變化。兩種應(yīng)用都利用電力來增強(qiáng)硬化的膠凝材料的性能和/或功能?；炷翉U水輸送系統(tǒng)中的微生物誘導(dǎo)腐蝕（MIC）是此類結(jié)構(gòu)中的主要劣化機(jī)理。這項工作的重點是通過防止負(fù)責(zé)將硫化氫轉(zhuǎn)化為硫酸的細(xì)菌定殖來打破MIC循環(huán)。電動勢用于將抗菌劑（氧化亞銅）驅(qū)入預(yù)制混凝土管的多孔壁表面。埋在混凝土中的鋼筋與放置在涂料溶液中的銅電極之間施加的電勢差為銅離子提供了驅(qū)動力。使用在涂層樣品上進(jìn)行的原子吸收測試來確定滲透到多孔表面并遷移到硬化混凝土基質(zhì)中的氧化亞銅的百分比。在三個模擬管道樣本上進(jìn)行的一項初步研究表明，該過程對部分腐蝕和未腐蝕的管道均有效。測試數(shù)據(jù)還顯示，遷移到混凝土基質(zhì)中的銅量與時間有關(guān)。根據(jù)初步測試結(jié)果，設(shè)計并處理了直徑為15英寸的商用預(yù)制混凝土管。該數(shù)據(jù)表明，可以重新使用該方法對MIC進(jìn)行“免疫”的新型和部分老化的鋼筋混凝土管。 ；由于高抗壓強(qiáng)度，強(qiáng)度增加率，耐火性，在高溫環(huán)境下保持結(jié)構(gòu)特性，在高酸環(huán)境下的化學(xué)穩(wěn)定性以及相對較低的含量，地聚合物在土木工程領(lǐng)域正在發(fā)現(xiàn)越來越多的利基應(yīng)用。成本和環(huán)境效益：導(dǎo)電地聚合物可以用作監(jiān)測自身健康的新型智能材料，通常，結(jié)構(gòu)的健康監(jiān)測是通過評估其應(yīng)力狀態(tài)來完成的，其中一種方法是監(jiān)測電阻的變化，以此間接指示其健康狀況。在結(jié)構(gòu)中的應(yīng)力變化。碳纖維被添加到新鮮的地質(zhì)聚合物混合物以增強(qiáng)其導(dǎo)電性。對樣品樣品進(jìn)行交流阻抗譜分析，以獲得其電阻。初步階段的結(jié)果表明，地質(zhì)聚合物表現(xiàn)出優(yōu)于OPC制混凝土作為電流導(dǎo)體的性能。動態(tài)加載含有最佳百分比碳纖維的導(dǎo)電地聚合物混凝土樣品，以觀察電阻的變化。從動態(tài)測試獲得的數(shù)據(jù)表明，導(dǎo)電地聚合物可以用作智能材料。

著錄項

相似文獻(xiàn)

  • 外文文獻(xiàn)
  • 中文文獻(xiàn)
  • 專利
獲取原文

客服郵箱：kefu@zhangqiaokeyan.com

京公網(wǎng)安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯(lián)合信息科技 (北京) 有限公司?版權(quán)所有

  • 客服微信

  • 服務(wù)號