本文關(guān)鍵詞： 炭黑 礦渣微粉 ECC 二電極法 體積電阻率 自感知特性 單軸拉伸試驗(yàn)　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：水泥基材料的壓敏特性早已被研究,但由于水泥基材料的脆性導(dǎo)致大多研究局限于在壓力荷載的作用下。工程水泥基復(fù)合材料(ECC)呈現(xiàn)優(yōu)越的延性并同時(shí)產(chǎn)生眾多寬度可控的微裂縫。這些力學(xué)特點(diǎn)為研究ECC材料在受拉和受彎狀態(tài)下體積電阻率的變化提供了可能性。探究ECC自身電阻率與拉應(yīng)力與拉應(yīng)變的關(guān)系,以及與裂縫模式的關(guān)系,進(jìn)而應(yīng)用于建筑物的健康監(jiān)控。相比于傳統(tǒng)的預(yù)埋置的傳感器裝置,利用材料自身的電學(xué)特性偵測(cè)裂縫和拉應(yīng)變具有無可比擬的優(yōu)越性,因?yàn)檫@種新型的傳感器技術(shù)并不會(huì)給建筑物本身帶來不利影響,且可以監(jiān)控整個(gè)建筑物,此外具有更大的應(yīng)變監(jiān)測(cè)范圍。因此利用ECC材料發(fā)展新型的傳感器就有十分重要的意義。首先,本文利用工業(yè)廢料礦渣微粉(GGBS)制備ECC材料,并用適量的引氣劑和橡膠粉末改善GGBS-ECC的延性。再在此基礎(chǔ)上加入一定比例的炭黑(CB)來提高ECC材料的導(dǎo)電性。發(fā)現(xiàn)炭黑的加入會(huì)嚴(yán)重影響ECC的極限拉應(yīng)變,通過改變水膠比、引氣劑和橡膠粉末的摻量,最終得到具有較低電阻率同時(shí)相對(duì)較好延性的CB-ECC配比設(shè)計(jì)。其次,采用二電極法對(duì)不同摻量的CB-ECC進(jìn)行電阻測(cè)量,發(fā)現(xiàn)所有試件在試驗(yàn)初期均出現(xiàn)極化現(xiàn)象,但物質(zhì)極化隨測(cè)試時(shí)間增加而逐漸趨于穩(wěn)定。同時(shí)得出,增加炭黑的比例有助于降低CB-ECC的電阻率。最后,研究CB-ECC材料在單軸拉伸和四點(diǎn)彎曲試驗(yàn)下,電阻率隨應(yīng)變、時(shí)間的關(guān)系,以及比較在極化穩(wěn)定階段、彈性階段、非彈性階段和應(yīng)力軟化階段的電阻率的變化。
[Abstract]:The pressure-sensitive properties of cement-based materials have long been studied. However, due to the brittleness of cement-based materials, most of the research is confined to the pressure load. The engineering cement matrix composites (ECCs) exhibit superior ductility and produce many microcracks with controllable width. These mechanical characteristics are as follows. It is possible to study the variation of volume resistivity of ECC materials under tensile and flexural conditions. The relationship between electrical resistivity and tensile stress and strain of ECC is investigated. And the relationship with crack mode, and then applied to health monitoring of buildings. Compared with the traditional pre-buried sensor device, it has unparalleled advantages to detect cracks and tensile strain by using the electrical characteristics of the material itself. Because this new sensor technology does not adversely affect the building itself and can monitor the building as a whole. Therefore, it is very important to develop a new type of sensor by using ECC materials. Firstly, the ECC materials are prepared by using industrial waste slag micro-powder (GGBs). The ductility of GGBS-ECC was improved with proper amount of air entraining agent and rubber powder, and the electrical conductivity of ECC material was improved by adding a certain proportion of carbon black. It was found that the addition of carbon black would seriously affect the ultimate tensile strain of ECC, and by changing the water-binder ratio, Finally, the ratio design of CB-ECC with lower resistivity and better ductility is obtained by adding air entraining agent and rubber powder. Secondly, the resistance of CB-ECC with different content is measured by two-electrode method. It was found that all the specimens showed polarization phenomenon at the beginning of the test, but the material polarization tended to be stable with the increase of test time. At the same time, it was found that increasing the proportion of carbon black would help to reduce the resistivity of CB-ECC. The relationship of resistivity with strain and time in uniaxial tensile and four-point bending tests of CB-ECC materials is studied. The changes of resistivity in polarization stable stage, elastic stage, inelastic stage and stress softening stage are compared.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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