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粉煤灰鋼筋混凝土對地鐵雜散電流的抑制 粉煤灰的低成本超細分級

 山(shan)東埃爾派  |  點(dian)擊量(liang):0次 | 2020-02-27 

摘要
粉煤灰主要由于該系列產品比表面積可達700-3000㎡/kg,細度比水泥和S95礦粉等細的多,比硅灰等球形度高,流動性、分散性好,且主要化學成分是活性氧化硅、活性氧化鋁、活性氧化鈣等

  粉煤灰主(zhu)(zhu)要由(you)于該系列產(chan)品比(bi)表(biao)面積可達700-3000㎡/kg,細(xi)度比(bi)水(shui)(shui)(shui)(shui)(shui)(shui)泥和S95礦粉等(deng)細(xi)的(de)多(duo),比(bi)硅(gui)(gui)(gui)灰等(deng)球(qiu)形(xing)度高,流動性(xing)(xing)(xing)、分(fen)散性(xing)(xing)(xing)好(hao),且主(zhu)(zhu)要化(hua)(hua)(hua)學(xue)(xue)成(cheng)分(fen)是活性(xing)(xing)(xing)氧(yang)化(hua)(hua)(hua)硅(gui)(gui)(gui)、活性(xing)(xing)(xing)氧(yang)化(hua)(hua)(hua)鋁(lv)、活性(xing)(xing)(xing)氧(yang)化(hua)(hua)(hua)鈣(gai)(gai)等(deng),在水(shui)(shui)(shui)(shui)(shui)(shui)泥混凝(ning)(ning)(ning)(ning)土(tu)體系中,一(yi)方(fang)面起到填充、潤滑、解絮、分(fen)散、致(zhi)密等(deng)物(wu)理作用(yong)(yong),另一(yi)方(fang)面該產(chan)品中的(de)活性(xing)(xing)(xing)氧(yang)化(hua)(hua)(hua)硅(gui)(gui)(gui)、活性(xing)(xing)(xing)氧(yang)化(hua)(hua)(hua)鋁(lv)等(deng)活性(xing)(xing)(xing)氧(yang)化(hua)(hua)(hua)物(wu)與水(shui)(shui)(shui)(shui)(shui)(shui)泥水(shui)(shui)(shui)(shui)(shui)(shui)化(hua)(hua)(hua)時析出的(de)氫氧(yang)化(hua)(hua)(hua)鈣(gai)(gai)晶(jing)體、水(shui)(shui)(shui)(shui)(shui)(shui)化(hua)(hua)(hua)硅(gui)(gui)(gui)酸(suan)鈣(gai)(gai)凝(ning)(ning)(ning)(ning)膠(jiao)等(deng)膠(jiao)凝(ning)(ning)(ning)(ning)材(cai)料、集料帶入(ru)的(de)有效堿(jian)、硫酸(suan)鹽、氯離子等(deng)對水(shui)(shui)(shui)(shui)(shui)(shui)泥石(shi)(shi)和混凝(ning)(ning)(ning)(ning)土(tu)強度及(ji)耐久(jiu)性(xing)(xing)(xing)不(bu)(bu)利(li)的(de)物(wu)質起化(hua)(hua)(hua)學(xue)(xue)反應,生成(cheng)對水(shui)(shui)(shui)(shui)(shui)(shui)泥石(shi)(shi)和混凝(ning)(ning)(ning)(ning)土(tu)強度及(ji)耐久(jiu)性(xing)(xing)(xing)有利(li)的(de)硅(gui)(gui)(gui)鋁(lv)酸(suan)鈣(gai)(gai)凝(ning)(ning)(ning)(ning)膠(jiao)和其(qi)他有益化(hua)(hua)(hua)合(he)物(wu),在物(wu)理和化(hua)(hua)(hua)學(xue)(xue)兩個(ge)方(fang)面作用(yong)(yong)下,改(gai)善了新拌混凝(ning)(ning)(ning)(ning)土(tu)的(de)工(gong)作性(xing)(xing)(xing)如(ru):流動性(xing)(xing)(xing)好(hao)、保水(shui)(shui)(shui)(shui)(shui)(shui)性(xing)(xing)(xing)好(hao)、不(bu)(bu)泌水(shui)(shui)(shui)(shui)(shui)(shui)、不(bu)(bu)離析、坍落度經時損(sun)失小、泵(beng)送性(xing)(xing)(xing)好(hao)等(deng)優點。改(gai)善漿體與集料界面的(de)粘結度,減少硬化(hua)(hua)(hua)混凝(ning)(ning)(ning)(ning)土(tu)的(de)孔(kong)隙,減小孔(kong)徑(jing),致(zhi)密結構及(ji)體積穩定性(xing)(xing)(xing),增強混凝(ning)(ning)(ning)(ning)土(tu)抵御各(ge)種(zhong)化(hua)(hua)(hua)學(xue)(xue)侵蝕(shi)和抑制堿(jian)集料反應能(neng)力,顯著提高水(shui)(shui)(shui)(shui)(shui)(shui)泥石(shi)(shi)和混凝(ning)(ning)(ning)(ning)土(tu)的(de)耐久(jiu)性(xing)(xing)(xing)。

  抑制地鐵雜散(san)電流的必要(yao)性

  近年來,我(wo)國很多大(da)城(cheng)市正在(zai)(zai)(zai)致(zhi)力于城(cheng)市地下地道(dao)和(he)(he)高架輕軌(gui)(gui)交通,它們(men)的(de)(de)(de)(de)主要(yao)結(jie)構為鋼(gang)(gang)筋(jin)(jin)混(hun)凝(ning)土。在(zai)(zai)(zai)運行過(guo)(guo)程中(zhong)不可(ke)(ke)避免(mian)地將有部分(fen)電(dian)(dian)(dian)(dian)流進入(ru)(ru)混(hun)凝(ning)土結(jie)構而(er)對鋼(gang)(gang)筋(jin)(jin)產生(sheng)(sheng)(sheng)雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流腐蝕(shi),嚴(yan)重威脅著鋼(gang)(gang)筋(jin)(jin)混(hun)凝(ning)土結(jie)構的(de)(de)(de)(de)安(an)全(quan)使(shi)(shi)(shi)(shi)用(yong)。粉(fen)煤灰價格(ge)一(yi)直都(dou)是(shi)(shi)大(da)家所關注(zhu)的(de)(de)(de)(de),能把粉(fen)煤灰綜合利用(yong)做到(dao)良好,那是(shi)(shi)極(ji)好的(de)(de)(de)(de)。為了防止或(huo)減(jian)少雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)腐蝕(shi)作用(yong),已采取(qu)了一(yi)些有效(xiao)(xiao)的(de)(de)(de)(de)措施(shi),一(yi)方面(mian)從供(gong)(gong)電(dian)(dian)(dian)(dian)系(xi)統的(de)(de)(de)(de)設計上(shang)(shang),通過(guo)(guo)提(ti)高牽引電(dian)(dian)(dian)(dian)網的(de)(de)(de)(de)供(gong)(gong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓,適當加設絕(jue)緣的(de)(de)(de)(de)輔助回流線來減(jian)小雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流產生(sheng)(sheng)(sheng)的(de)(de)(de)(de)根源,另(ling)一(yi)方面(mian),通過(guo)(guo)對雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流的(de)(de)(de)(de)作用(yong)物(wu)加強防護來延長被保(bao)護物(wu)的(de)(de)(de)(de)工作壽命(ming),這些措施(shi)都(dou)是(shi)(shi)有效(xiao)(xiao)的(de)(de)(de)(de),但是(shi)(shi),即使(shi)(shi)(shi)(shi)通過(guo)(guo)這些措施(shi)使(shi)(shi)(shi)(shi)新建的(de)(de)(de)(de)地鐵(tie)和(he)(he)輕軌(gui)(gui)系(xi)統的(de)(de)(de)(de)雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流很小,由于地鐵(tie)和(he)(he)輕軌(gui)(gui)系(xi)統在(zai)(zai)(zai)運行一(yi)段(duan)時間以(yi)后(hou)不可(ke)(ke)避免(mian)地受(shou)到(dao)污染、潮濕、漏(lou)水和(he)(he)受(shou)力破壞等因(yin)素,仍會使(shi)(shi)(shi)(shi)原來良好的(de)(de)(de)(de)軌(gui)(gui)地絕(jue)緣性能降低或(huo)失效(xiao)(xiao),正由于鋼(gang)(gang)筋(jin)(jin)混(hun)凝(ning)土中(zhong)的(de)(de)(de)(de)鋼(gang)(gang)筋(jin)(jin)被腐蝕(shi),使(shi)(shi)(shi)(shi)鋼(gang)(gang)筋(jin)(jin)生(sheng)(sheng)(sheng)成鐵(tie)的(de)(de)(de)(de)化(hua)合物(wu),由于鐵(tie)鎊體積增(zeng)大(da)2~3倍(bei)以(yi)上(shang)(shang),因(yin)此(ci)引起鋼(gang)(gang)筋(jin)(jin)周圍的(de)(de)(de)(de)混(hun)凝(ning)土脹裂。靠近陰極(ji)的(de)(de)(de)(de)混(hun)凝(ning)土產生(sheng)(sheng)(sheng)堿富(fu)集(ji)現(xian)象,使(shi)(shi)(shi)(shi)混(hun)凝(ning)土變(bian)(bian)軟,鋼(gang)(gang)筋(jin)(jin)粘結(jie)力下降。嚴(yan)重時使(shi)(shi)(shi)(shi)整個鋼(gang)(gang)筋(jin)(jin)混(hun)凝(ning)土失去承(cheng)載能力而(er)破壞。英國由于地下電(dian)(dian)(dian)(dian)氣鐵(tie)道(dao)雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流腐蝕(shi),曾(ceng)經發(fa)生(sheng)(sheng)(sheng)鋼(gang)(gang)筋(jin)(jin)混(hun)凝(ning)土隧道(dao)塌方事故,危害(hai)較(jiao)大(da),因(yin)此(ci),研究(jiu)在(zai)(zai)(zai)混(hun)凝(ning)土中(zhong)摻入(ru)(ru)粉(fen)煤灰改變(bian)(bian)原材(cai)料組成和(he)(he)水泥石的(de)(de)(de)(de)結(jie)構,提(ti)高混(hun)凝(ning)土電(dian)(dian)(dian)(dian)阻而(er)達到(dao)抑制雜(za)(za)(za)散(san)電(dian)(dian)(dian)(dian)流腐蝕(shi)是(shi)(shi)十(shi)分(fen)必要(yao)的(de)(de)(de)(de)。

  總的分析

  為了抑制城(cheng)市軌道(dao)交通中的雜散電(dian)流腐蝕,提高(gao)(gao)混(hun)凝土(tu)的阻抗(尤其(qi)(qi)是(shi)濕電(dian)阻)是(shi)一種(zhong)有(you)效的途徑(jing)。混(hun)凝土(tu)的濕電(dian)阻與其(qi)(qi)孔隙(xi)率和密實度有(you)密切關系,通過在混(hun)凝土(tu)中摻加一定(ding)要求的粉(fen)煤灰(hui)(約取代30%水(shui)(shui)泥,同時控制用水(shui)(shui)量(liang)),可(ke)以有(you)效地改善(shan)其(qi)(qi)內部(bu)微觀結(jie)構,有(you)利于提高(gao)(gao)其(qi)(qi)濕電(dian)阻,并降低(di)其(qi)(qi)孔隙(xi)率,提高(gao)(gao)其(qi)(qi)密實性,抑制雜散電(dian)流腐蝕,而且節約水(shui)(shui)泥,降低(di)成(cheng)本,改善(shan)性能(neng),具有(you)一定(ding)的技術(shu)經(jing)濟意義。

  山東埃爾派粉(fen)體(ti)科技有限公司(si)粉(fen)煤(mei)灰專用(yong)分(fen)(fen)(fen)選(xuan)機(ji),物料(liao)(liao)通過(guo)分(fen)(fen)(fen)選(xuan)機(ji)上部的(de)(de)(de)(de)進料(liao)(liao)口進入選(xuan)粉(fen)室內,物料(liao)(liao)落入轉(zhuan)動(dong)的(de)(de)(de)(de)撒料(liao)(liao)盤(pan)上,在離心力(li)作(zuo)用(yong)下,向四周均勻拋(pao)出(chu),分(fen)(fen)(fen)散的(de)(de)(de)(de)物料(liao)(liao)在外接風機(ji)的(de)(de)(de)(de)高速氣流作(zuo)用(yong)下,粗重顆粒被(bei)甩向選(xuan)粉(fen)室的(de)(de)(de)(de)內壁(bi)(bi),失(shi)去(qu)動(dong)能后沿壁(bi)(bi)面滑(hua)下,在分(fen)(fen)(fen)選(xuan)機(ji)底部排出(chu)腔體(ti),其余粒度較細的(de)(de)(de)(de)顆粒被(bei)旋轉(zhuan)上升(sheng)的(de)(de)(de)(de)氣流卷(juan)起,穿過(guo)分(fen)(fen)(fen)級轉(zhuan)子(zi)的(de)(de)(de)(de)葉片進入高效旋風分(fen)(fen)(fen)離器中(zhong),作(zuo)為成品被(bei)收集。

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