本文關(guān)鍵詞： 石墨尾礦 碳纖維 受力性能 壓敏特性 抗凍性　出處：《黑龍江大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：我國(guó)多年的石墨開(kāi)采遺留大量的尾礦,這些尾礦侵占土地,污染環(huán)境,至今未得到有效地開(kāi)發(fā)利用,將石墨尾礦添加到混凝土中,分析石墨尾礦混凝土的強(qiáng)度和導(dǎo)電性。采用正交設(shè)計(jì)法來(lái)研究水灰比、砂率、尾礦砂和顆粒石摻量、短切碳纖維摻量等因素對(duì)混凝土的抗壓強(qiáng)度、導(dǎo)電性、壓敏性和抗凍性的影響,研究石墨尾礦石混凝土能否應(yīng)用于建筑,道路和橋梁結(jié)構(gòu)。研究結(jié)果表明,石墨尾礦混凝土的抗壓強(qiáng)度隨水灰比、尾礦含量的增大而變小,隨短切碳纖維的增大而略微變大。石墨尾礦混凝土的電阻率隨石墨尾礦含量、碳纖維含量的增加而變小,反之而變大。在彈性范圍內(nèi),石墨尾礦混凝土地電阻率隨荷載地增大而減小,反之而變大,其壓敏特性呈現(xiàn)良好的對(duì)應(yīng)關(guān)系。石墨尾礦的添加對(duì)混凝土凍融循環(huán)后的質(zhì)量和抗壓強(qiáng)度損耗影響較小,碳纖維可以減少砼凍融循環(huán)后的質(zhì)量和抗壓強(qiáng)度損失。通過(guò)研究分析得出尾礦最佳含量是10%左右,碳纖維最佳含量是0.3%左右。以上研究結(jié)果對(duì)研究石墨尾礦混凝土地力學(xué)和電學(xué),對(duì)石墨尾礦混凝土應(yīng)用到工程結(jié)構(gòu)中,具有一定的意義和實(shí)用價(jià)值。對(duì)石墨尾礦混凝土地力學(xué)、電學(xué)特性進(jìn)行系統(tǒng)研究對(duì)節(jié)省土地利用率,保護(hù)環(huán)境具有重要的實(shí)際意義。
[Abstract]:For many years graphite mining in China has left a large number of tailings which occupy the land and pollute the environment. So far they have not been effectively exploited and utilized. Graphite tailings have been added to concrete. The strength and conductivity of graphite tailings concrete are analyzed. The compressive strength and electrical conductivity of concrete are studied by orthogonal design method, such as water-cement ratio, sand ratio, the content of tailings and granular stone, the content of short cut carbon fiber, etc. The effect of pressure sensitivity and frost resistance on the application of graphite tailings concrete to building, road and bridge structures is studied. The results show that the compressive strength of graphite tailings concrete decreases with the increase of water-cement ratio and tailings content. The resistivity of graphite tailings concrete decreases with the increase of graphite tailings content, and decreases with the increase of carbon fiber content. The earth resistivity of graphite tailing concrete decreases with the increase of the load, whereas the pressure sensitivity of graphite tailings decreases with the increase of load, and the effect of graphite tailings addition on the quality and compressive strength loss of concrete after freeze-thaw cycle is small. Carbon fiber can reduce the loss of concrete quality and compressive strength after freeze-thaw cycle. The optimum content of tailings is about 10%. The optimum content of carbon fiber is about 0.3%. The above results are of certain significance and practical value for studying the mechanics and electricity of graphite tailings concrete, for the application of graphite tailings concrete to engineering structure, and for the geomechanics of graphite tailings concrete. Systematic study of electrical characteristics is of great practical significance in saving land utilization and protecting environment.
【學(xué)位授予單位】：黑龍江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU528

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本文編號(hào)：1550898