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首頁(yè)> 外文學(xué)位 >Microwave material characterization of alkali-silica reaction (ASR) gel in cementitious materials.
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Microwave material characterization of alkali-silica reaction (ASR) gel in cementitious materials.

機(jī)譯：膠結(jié)材料中堿-硅反應(yīng)（ASR）凝膠的微波材料表征。

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Since alkali-silica reaction (ASR) was recognized as a durability challenge in cement-based materials over 70 years ago, numerous methods have been utilized to prevent, detect, and mitigate this issue. However, quantifying the amount of produced ASR byproducts (i.e., ASR gel) in-service is still of great interest in the infrastructure industry. The overarching objective of this dissertation is to bring a new understanding to the fundamentals of ASR formation from a microwave dielectric property characterization point-of-view, and more importantly, to investigate the potential for devising a microwave nondestructive testing approach for ASR gel detection and evaluation. To this end, a comprehensive dielectric mixing model was developed with the potential for predicting the effective dielectric constant of mortar samples with and without the presence of ASR gel. To provide pertinent inputs to the model, critical factors on the influence of ASR gel formation on dielectric and reflection properties of several mortar samples were investigated at R, S, and X-band. Effects of humidity, alkali content, and long-term curing conditions on ASR-prone mortars were also investigated. Additionally, dielectric properties of chemically different synthetic ASR gel were also determined. All of these, collectively, served as critical inputs to the mixing model.;The resulting developed dielectric mixing model has the potential to be further utilized to quantify the amount of produced ASR gel in cement-based materials. This methodology, once becomes more mature, will bring new insight to the ASR reaction, allowing for advancements in design, detection and mitigation of ASR, and eventually has the potential to become a method-of-choice for in-situ infrastructure health-monitoring of existing structures.
機(jī)譯：自70年前以來(lái)，堿-二氧化硅反應(yīng)（ASR）被認(rèn)為是水泥基材料的耐久性挑戰(zhàn)，因此已經(jīng)采用了許多方法來(lái)預(yù)防，檢測(cè)和緩解此問(wèn)題。但是，在基礎(chǔ)設(shè)施行業(yè)中，仍然需要對(duì)在役的生產(chǎn)中的ASR副產(chǎn)物（即ASR凝膠）的數(shù)量進(jìn)行量化。本論文的總體目標(biāo)是從微波介電特性表征的角度對(duì)ASR的形成原理進(jìn)行新的理解，更重要的是，探討為ASR凝膠檢測(cè)和檢測(cè)設(shè)計(jì)微波無(wú)損檢測(cè)方法的潛力。評(píng)價(jià)。為此，開發(fā)了一種綜合的介電混合模型，該模型可以預(yù)測(cè)有無(wú)ASR凝膠存在下砂漿樣品的有效介電常數(shù)。為了向模型提供相關(guān)輸入，在R，S和X波段研究了影響ASR凝膠形成對(duì)幾種砂漿樣品的介電和反射特性影響的關(guān)鍵因素。還研究了濕度，堿含量和長(zhǎng)期固化條件對(duì)ASR砂漿的影響。此外，還測(cè)定了化學(xué)上不同的合成ASR凝膠的介電性能。所有這些共同作為混合模型的關(guān)鍵輸入。所得的開發(fā)的介電混合模型具有潛力，可以進(jìn)一步用于量化水泥基材料中生產(chǎn)的ASR凝膠的量。這種方法一旦變得更加成熟，將為ASR反應(yīng)帶來(lái)新的見(jiàn)解，從而允許ASR的設(shè)計(jì)，檢測(cè)和緩解方面的進(jìn)步，并最終有可能成為現(xiàn)場(chǎng)基礎(chǔ)設(shè)施健康監(jiān)測(cè)的首選方法現(xiàn)有結(jié)構(gòu)。

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  • 作者

    Hashemi, Ashkan.;

  • 作者單位

    Missouri University of Science and Technology.;

  • 授予單位 Missouri University of Science and Technology.;
  • 學(xué)科 Electrical engineering.;Civil engineering.;Materials science.
  • 學(xué)位 Ph.D.
  • 年度 2016
  • 頁(yè)碼 188 p.
  • 總頁(yè)數(shù) 188
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
  • 關(guān)鍵詞

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