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促凝還是早強
發(fa)布日期(qi)：2015-09-06 | 關注：[1000]

氣溫低時混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)用(yong)(yong)的(de)(de)(de)(de)(de)早(zao)強(qiang)(qiang)(qiang)劑(ji)(ji)(ji)，但早(zao)強(qiang)(qiang)(qiang)與(yu)早(zao)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)畢竟又(you)不(bu)(bu)(bu)相(xiang)(xiang)同(tong)。現在(zai)的(de)(de)(de)(de)(de)商(shang)品(pin)混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)中都(dou)添加了(le)緩凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)，即使在(zai)秋、冬季也不(bu)(bu)(bu)能(neng)完(wan)全(quan)去掉，因為有(you)了(le)它(ta)才能(neng)控制坍落度(du)(du)損失。可有(you)了(le)緩凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)又(you)會(hui)帶來混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)強(qiang)(qiang)(qiang)度(du)(du)發展比較慢，又(you)出(chu)現了(le)早(zao)強(qiang)(qiang)(qiang)偏低的(de)(de)(de)(de)(de)負(fu)面(mian)效果(guo)。施工人員此刻不(bu)(bu)(bu)僅(jin)希望入了(le)模的(de)(de)(de)(de)(de)混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)能(neng)早(zao)強(qiang)(qiang)(qiang)，還巴不(bu)(bu)(bu)得能(neng)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)結(jie)得快一(yi)些，尤(you)其是(shi)入模后(hou)的(de)(de)(de)(de)(de)10~16小時內終凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)，令混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)有(you)一(yi)定(ding)初始強(qiang)(qiang)(qiang)度(du)(du)，能(neng)拆卸側模則(ze)(ze)是(shi)當前(qian)外加劑(ji)(ji)(ji)技(ji)術能(neng)夠辦到，而不(bu)(bu)(bu)必采取熱養護工藝。實(shi)驗(yan)經驗(yan)告(gao)訴我們(men)，促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)都(dou)有(you)使混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)早(zao)強(qiang)(qiang)(qiang)的(de)(de)(de)(de)(de)效果(guo)。環境溫度(du)(du)越低，早(zao)強(qiang)(qiang)(qiang)相(xiang)(xiang)對就越高（相(xiang)(xiang)對于(yu)不(bu)(bu)(bu)摻(chan)促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)的(de)(de)(de)(de)(de)混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)來講(jiang)），比如氯(lv)化(hua)(hua)(hua)鈣、海(hai)波。但反過來早(zao)強(qiang)(qiang)(qiang)劑(ji)(ji)(ji)則(ze)(ze)不(bu)(bu)(bu)都(dou)是(shi)促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)的(de)(de)(de)(de)(de)，有(you)的(de)(de)(de)(de)(de)在(zai)早(zao)期的(de)(de)(de)(de)(de)時間(jian)段里還是(shi)緩凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)的(de)(de)(de)(de)(de)，比如亞(ya)硫酸(suan)鈉、三乙醇胺。*經典、*有(you)效的(de)(de)(de)(de)(de)促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)之一(yi)是(shi)氧化(hua)(hua)(hua)鈣，當其在(zai)和(he)帶有(you)緩凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)作用(yong)(yong)的(de)(de)(de)(de)(de)普通(tong)減水劑(ji)(ji)(ji)木質素(su)磺酸(suan)鹽相(xiang)(xiang)同(tong)匹配時，可以(yi)說(shuo)無出(chu)其右者(zhe)；而與(yu)糖(tang)相(xiang)(xiang)配的(de)(de)(de)(de)(de)早(zao)強(qiang)(qiang)(qiang)促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)則(ze)(ze)是(shi)元(yuan)明(ming)粉(fen)了(le)。氯(lv)化(hua)(hua)(hua)鋰的(de)(de)(de)(de)(de)促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)作用(yong)(yong)與(yu)氯(lv)化(hua)(hua)(hua)鈣相(xiang)(xiang)當，比氯(lv)化(hua)(hua)(hua)亞(ya)錫強(qiang)(qiang)(qiang)烈一(yi)些。促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)劑(ji)(ji)(ji)大(da)多是(shi)強(qiang)(qiang)(qiang)電質無機鹽和(he)小分(fen)子量(liang)羧酸(suan)鹽。前(qian)者(zhe)如堿金(jin)(jin)屬(shu)（Na、K、Li）及堿土(tu)(tu)(tu)金(jin)(jin)屬(shu)（Ca、Mg）的(de)(de)(de)(de)(de)氯(lv)鹽、硫酸(suan)鹽、碳酸(suan)鹽、硝酸(suan)鹽、鋁酸(suan)鹽等；后(hou)者(zhe)如甲酸(suan)鈣、乙酸(suan)鈣、酰胺類物(wu)質等。氯(lv)化(hua)(hua)(hua)銨不(bu)(bu)(bu)是(shi)堿金(jin)(jin)屬(shu)系列，它(ta)的(de)(de)(de)(de)(de)促(cu)(cu)(cu)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)作用(yong)(yong)雖不(bu)(bu)(bu)如氯(lv)化(hua)(hua)(hua)鈣，但明(ming)顯勝過氯(lv)化(hua)(hua)(hua)鉀，也略好于(yu)氯(lv)化(hua)(hua)(hua)鈉，但是(shi)其共同(tong)的(de)(de)(de)(de)(de)缺(que)點是(shi)使混(hun)(hun)(hun)凝(ning)(ning)(ning)(ning)(ning)(ning)(ning)土(tu)(tu)(tu)坍落度(du)(du)加快。

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