熟石灰由來
熟(shu)石灰(hui)(hui)(hui)(hui)是(shi)人(ren)類最早應用(yong)(yong)(yong)(yong)的(de)(de)(de)凝膠材(cai)料。公(gong)(gong)元前(qian)8世(shi)紀古希臘人(ren)已用(yong)(yong)(yong)(yong)于建筑,公(gong)(gong)元前(qian)7世(shi)紀的(de)(de)(de)周(zhou)(zhou)朝也出現了石灰(hui)(hui)(hui)(hui),周(zhou)(zhou)朝的(de)(de)(de)石灰(hui)(hui)(hui)(hui)是(shi)用(yong)(yong)(yong)(yong)大蛤(ha)的(de)(de)(de)外殼燒(shao)(shao)制(zhi)而(er)成,而(er)蛤(ha)殼主要成分是(shi)碳(tan)酸鈣(gai),它將煅燒(shao)(shao)到(dao)的(de)(de)(de)碳(tan)酸氣全部(bu)逸出即成石灰(hui)(hui)(hui)(hui)。《左傳(chuan)》中(zhong)(zhong)有(you)記載:“成公(gong)(gong)二年(公(gong)(gong)元前(qian)635年)八(ba)月宋文公(gong)(gong)卒,始厚(hou)葬用(yong)(yong)(yong)(yong)蜃(shen)灰(hui)(hui)(hui)(hui)”,蜃(shen)灰(hui)(hui)(hui)(hui)就(jiu)是(shi)用(yong)(yong)(yong)(yong)蛤(ha)殼燒(shao)(shao)制(zhi)而(er)成的(de)(de)(de)石灰(hui)(hui)(hui)(hui)材(cai)料,在(zai)周(zhou)(zhou)朝就(jiu)已發現它具有(you)良好的(de)(de)(de)吸濕防潮性能(neng)和膠凝性能(neng),在(zai)明代《天工(gong)開物(wu)》一書(shu)中(zhong)(zhong)有(you)“燒(shao)(shao)礪(li)房法的(de)(de)(de)圖(tu)示”,這(zhe)說明蜃(shen)灰(hui)(hui)(hui)(hui)的(de)(de)(de)生產和使用(yong)(yong)(yong)(yong),自周(zhou)(zhou)朝開始到(dao)明代仍未(wei)失傳(chuan),在(zai)中(zhong)(zhong)國歷史上(shang)流傳(chuan)了很長(chang)的(de)(de)(de)時間,至(zhi)今,中(zhong)(zhong)國使用(yong)(yong)(yong)(yong)石灰(hui)(hui)(hui)(hui)作為(wei)建筑凝膠材(cai)料已有(you)千年歷史,現在(zai)保留的(de)(de)(de)不(bu)少古代華麗壁畫和夯實(shi)地基遺址都使用(yong)(yong)(yong)(yong)了石灰(hui)(hui)(hui)(hui),秦長(chang)城的(de)(de)(de)建造是(shi)一個例證。
由于(yu)磚(zhuan)石(shi)(shi)結構需要(yao)用優(you)良性能的(de)(de)膠凝材料進行砌(qi)(qi)筑,這就促(cu)使了石(shi)(shi)灰(hui)(hui)(hui)(hui)制(zhi)造(zao)業迅(xun)速發展,紛紛采用各地都(dou)能采集(ji)到的(de)(de)石(shi)(shi)灰(hui)(hui)(hui)(hui)石(shi)(shi)燒制(zhi)石(shi)(shi)灰(hui)(hui)(hui)(hui),石(shi)(shi)灰(hui)(hui)(hui)(hui)生產點應運(yun)而生,那時(shi),石(shi)(shi)灰(hui)(hui)(hui)(hui)的(de)(de)使用方法(fa)只是先將石(shi)(shi)灰(hui)(hui)(hui)(hui)與水混合制(zhi)成(cheng)石(shi)(shi)灰(hui)(hui)(hui)(hui)漿體,然后用漿體砌(qi)(qi)筑條石(shi)(shi)、磚(zhuan)墻(qiang)和磚(zhuan)石(shi)(shi)拱券以(yi)及粉刷墻(qiang)面,而現在伴隨技術的(de)(de)不斷(duan)(duan)更新(xin),熟(shu)石(shi)(shi)灰(hui)(hui)(hui)(hui)的(de)(de)使用方法(fa)不斷(duan)(duan)升級。
凡是以碳(tan)酸鈣為主要成分的(de)天然巖石(shi),如石(shi)灰巖、白(bai)堊(e)、白(bai)云質石(shi)灰巖等,都可用來生產石(shi)灰。如下(xia)圖所示,即石(shi)灰的(de)原材料。
石(shi)(shi)灰(hui)的提煉過(guo)程(cheng)會產(chan)生化(hua)學(xue)反(fan)應(ying),當生石(shi)(shi)灰(hui)與(yu)水反(fan)應(ying)(同時(shi)放出(chu)大(da)量的熱),或吸(xi)收(shou)潮濕(shi)空氣中的水分,即成(cheng)熟石(shi)(shi)灰(hui)[氫氧化(hua)鈣Ca(0H)2],又稱“消(xiao)石(shi)(shi)灰(hui)”,熟石(shi)(shi)灰(hui)在(zai)一(yi)升水中溶解1.56克(20℃),它的飲和溶液稱為“石(shi)(shi)灰(hui)水”,呈(cheng)堿(jian)性,在(zai)空氣中吸(xi)收(shou)二氧化(hua)碳而(er)成(cheng)碳酸鈣沉淀。如(ru)下圖所示,即熟石(shi)(shi)灰(hui)粉
由于石灰(hui)具有(you)較強(qiang)的堿(jian)性,在常溫下,能與玻璃態的活(huo)性氧化(hua)硅(gui)或(huo)活(huo)性氧化(hua)鋁反應,生成有(you)水硬性的產物,產生膠結,因此,石灰(hui)還是建(jian)筑材料(liao)中重要的原材料(liao)。
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