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粉煤灰在混凝土中的效應 粉煤灰的低成本超細分級

山東埃(ai)爾派 | 點擊量:0次 | 2020-04-13  

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(fen)煤(mei)灰主要(yao)由于該(gai)系(xi)列產品(pin)比(bi)(bi)表面積(ji)可達700-3000㎡/kg,細(xi)度(du)(du)比(bi)(bi)水(shui)(shui)泥和(he)(he)S95礦粉(fen)等(deng)(deng)細(xi)的(de)(de)(de)多(duo),比(bi)(bi)硅(gui)灰等(deng)(deng)球形度(du)(du)高,流(liu)動性(xing)(xing)(xing)(xing)、分(fen)(fen)散性(xing)(xing)(xing)(xing)好(hao),且(qie)主要(yao)化(hua)(hua)學成分(fen)(fen)是活(huo)性(xing)(xing)(xing)(xing)氧(yang)(yang)(yang)化(hua)(hua)硅(gui)、活(huo)性(xing)(xing)(xing)(xing)氧(yang)(yang)(yang)化(hua)(hua)鋁、活(huo)性(xing)(xing)(xing)(xing)氧(yang)(yang)(yang)化(hua)(hua)鈣等(deng)(deng),在水(shui)(shui)泥混(hun)(hun)(hun)凝(ning)土(tu)體(ti)系(xi)中,一方面起(qi)到填充、潤(run)滑、解絮、分(fen)(fen)散、致密等(deng)(deng)物(wu)理作(zuo)用,另一方面該(gai)產品(pin)中的(de)(de)(de)活(huo)性(xing)(xing)(xing)(xing)氧(yang)(yang)(yang)化(hua)(hua)硅(gui)、活(huo)性(xing)(xing)(xing)(xing)氧(yang)(yang)(yang)化(hua)(hua)鋁等(deng)(deng)活(huo)性(xing)(xing)(xing)(xing)氧(yang)(yang)(yang)化(hua)(hua)物(wu)與水(shui)(shui)泥水(shui)(shui)化(hua)(hua)時析出(chu)的(de)(de)(de)氫氧(yang)(yang)(yang)化(hua)(hua)鈣晶體(ti)、水(shui)(shui)化(hua)(hua)硅(gui)酸(suan)鈣凝(ning)膠等(deng)(deng)膠凝(ning)材(cai)料、集料帶入(ru)的(de)(de)(de)有(you)效堿、硫(liu)酸(suan)鹽、氯離子等(deng)(deng)對水(shui)(shui)泥石和(he)(he)混(hun)(hun)(hun)凝(ning)土(tu)強(qiang)(qiang)度(du)(du)及耐(nai)(nai)久(jiu)性(xing)(xing)(xing)(xing)不利的(de)(de)(de)物(wu)質(zhi)起(qi)化(hua)(hua)學反應(ying),生成對水(shui)(shui)泥石和(he)(he)混(hun)(hun)(hun)凝(ning)土(tu)強(qiang)(qiang)度(du)(du)及耐(nai)(nai)久(jiu)性(xing)(xing)(xing)(xing)有(you)利的(de)(de)(de)硅(gui)鋁酸(suan)鈣凝(ning)膠和(he)(he)其他有(you)益化(hua)(hua)合(he)物(wu),在物(wu)理和(he)(he)化(hua)(hua)學兩(liang)個方面作(zuo)用下(xia),改善了新拌混(hun)(hun)(hun)凝(ning)土(tu)的(de)(de)(de)工作(zuo)性(xing)(xing)(xing)(xing)如(ru):流(liu)動性(xing)(xing)(xing)(xing)好(hao)、保(bao)水(shui)(shui)性(xing)(xing)(xing)(xing)好(hao)、不泌水(shui)(shui)、不離析、坍落度(du)(du)經(jing)時損失(shi)小(xiao)、泵送性(xing)(xing)(xing)(xing)好(hao)等(deng)(deng)優(you)點。改善漿體(ti)與集料界(jie)面的(de)(de)(de)粘結度(du)(du),減少硬化(hua)(hua)混(hun)(hun)(hun)凝(ning)土(tu)的(de)(de)(de)孔(kong)隙,減小(xiao)孔(kong)徑,致密結構及體(ti)積(ji)穩定性(xing)(xing)(xing)(xing),增強(qiang)(qiang)混(hun)(hun)(hun)凝(ning)土(tu)抵御各(ge)種化(hua)(hua)學侵蝕和(he)(he)抑制堿集料反應(ying)能(neng)力(li),顯著提(ti)高水(shui)(shui)泥石和(he)(he)混(hun)(hun)(hun)凝(ning)土(tu)的(de)(de)(de)耐(nai)(nai)久(jiu)性(xing)(xing)(xing)(xing)。

粉煤灰(hui)在混凝土中(zhong)的效應(ying)

由于粉(fen)煤(mei)灰(hui)(hui)固(gu)有的(de)(de)火山(shan)(shan)灰(hui)(hui)活(huo)性(xing)(xing),它能與(yu)水泥水化(hua)過程中(zhong)析(xi)出的(de)(de)氫氧化(hua)鈣緩慢進(jin)行“二(er)次(ci)反應”,在表面形(xing)成(cheng)火山(shan)(shan)灰(hui)(hui)質反應生成(cheng)物,與(yu)水泥漿(jiang)硬(ying)化(hua)體晶格堅(jian)固(gu)地結合(he)起來,進(jin)而增長后期強(qiang)度,提(ti)高混凝(ning)(ning)土的(de)(de)抗滲性(xing)(xing)和耐久性(xing)(xing)。在粉(fen)煤(mei)灰(hui)(hui)加工過程中(zhong),需要用(yong)到粉(fen)煤(mei)灰(hui)(hui)磨(mo)機的(de)(de)地方還(huan)是(shi)比(bi)較(jiao)多的(de)(de)。除火山(shan)(shan)灰(hui)(hui)材料特性(xing)(xing)的(de)(de)作(zuo)用(yong)以(yi)外(wai),粉(fen)煤(mei)灰(hui)(hui)還(huan)存在著形(xing)態效(xiao)應、活(huo)性(xing)(xing)效(xiao)應和微(wei)集料效(xiao)應等,在混凝(ning)(ning)土中(zhong)產生一些特殊的(de)(de)物理(li)功(gong)能,比(bi)如粉(fen)煤(mei)灰(hui)(hui)的(de)(de)減水功(gong)能、增3Jtl漿(jiang)體的(de)(de)體積功(gong)能、調節(jie)凝(ning)(ning)膠(jiao)量和膠(jiao)凝(ning)(ning)過程的(de)(de)功(gong)能,填充漿(jiang)體孔隙功(gong)能、與(yu)水泥整體的(de)(de)協同作(zuo)用(yong)功(gong)能等,使粉(fen)煤(mei)灰(hui)(hui)混凝(ning)(ning)土物理(li)化(hua)學作(zuo)用(yong)達(da)到動態平衡,使混凝(ning)(ning)土性(xing)(xing)能改善和質量提(ti)高。

1.顆粒形(xing)態效應產(chan)生(sheng)減水勢能

粉煤灰顆粒多呈(cheng)球形,粒徑(jing)很小,表面(mian)比較光滑,這種球形小顆粒通(tong)稱“微珠(zhu)”,摻入混(hun)凝土(tu)中(zhong),猶如(ru)滾珠(zhu),可提高混(hun)凝土(tu)的和(he)易性,減少用水量。

2.火(huo)山灰效(xiao)應產生活化勢能(neng)

粉(fen)(fen)煤(mei)灰(hui)的(de)(de)主要化學成分是(shi)SiO:、A1:O,、Fe:O,,粉(fen)(fen)煤(mei)灰(hui)中有少部分CaO,若含量高其自(zi)身就具有一定的(de)(de)水(shui)硬活性,大(da)多(duo)數粉(fen)(fen)煤(mei)灰(hui)CaO含量低(di),受到水(shui)泥(ni)(ni)水(shui)化生(sheng)(sheng)成的(de)(de)Ca(OH),或外(wai)加激發劑的(de)(de)激發,逐漸發生(sheng)(sheng)火山灰(hui)反應,生(sheng)(sheng)成類似水(shui)泥(ni)(ni)水(shui)化的(de)(de)C-S-H凝膠,使混凝土膠結產(chan)生(sheng)(sheng)力學強度。

表(biao)面(mian)(mian)(mian)改(gai)性(xing)(xing)是(shi)(shi)填(tian)(tian)(tian)料(liao)(liao)(liao)由一般增(zeng)量(liang)填(tian)(tian)(tian)料(liao)(liao)(liao)變為(wei)功能性(xing)(xing)填(tian)(tian)(tian)料(liao)(liao)(liao)所必(bi)要(yao)的(de)加工手段之一,也是(shi)(shi)礦物填(tian)(tian)(tian)料(liao)(liao)(liao)表(biao)面(mian)(mian)(mian)改(gai)性(xing)(xing)主(zhu)要(yao)的(de)目的(de)。礦物填(tian)(tian)(tian)料(liao)(liao)(liao)表(biao)面(mian)(mian)(mian)改(gai)性(xing)(xing)主(zhu)要(yao)作(zuo)用(yong)(yong)(yong)包(bao)(bao)括分散作(zuo)用(yong)(yong)(yong)、降黏作(zuo)用(yong)(yong)(yong)、增(zeng)填(tian)(tian)(tian)作(zuo)用(yong)(yong)(yong)、界面(mian)(mian)(mian)力學(xue)作(zuo)用(yong)(yong)(yong)。最常用(yong)(yong)(yong)改(gai)性(xing)(xing)方法(fa)主(zhu)要(yao)有(you)表(biao)面(mian)(mian)(mian)化學(xue)改(gai)性(xing)(xing)法(fa)、包(bao)(bao)覆改(gai)性(xing)(xing)法(fa)、機械力化學(xue)改(gai)性(xing)(xing)法(fa)。山東埃爾派(pai)粉體科技有(you)限公司提供各類非金屬礦物(粉煤灰、鋼渣(zha)、礦渣(zha)等)改(gai)性(xing)(xing)設備和方案。

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