(5)采(cai)(cai)(cai)用(yong)(yong)復合型防(fang)(fang)凍(dong)(dong)劑中有引氣(qi)劑混凝(ning)土應采(cai)(cai)(cai)用(yong)(yong)負溫(wen)(wen)法養(yang)護(hu),不(bu)能采(cai)(cai)(cai)用(yong)(yong)蒸(zheng)汽(qi)養(yang)護(hu)。采(cai)(cai)(cai)用(yong)(yong)蒸(zheng)汽(qi)養(yang)護(hu)不(bu)但降低它的(de)強度(du)(du),而且還降低它的(de)耐久性。混凝(ning)土澆(jiao)灌(guan)完后(hou),立(li)即(ji)對外露面進行覆蓋,并不(bu)得澆(jiao)水。初期養(yang)護(hu)溫(wen)(wen)度(du)(du)不(bu)得低于(yu)防(fang)(fang)凍(dong)(dong)劑的(de)規定(ding)溫(wen)(wen)度(du)(du)。當混凝(ning)土的(de)溫(wen)(wen)度(du)(du)降到(dao)防(fang)(fang)凍(dong)(dong)劑規定(ding)溫(wen)(wen)度(du)(du)以下時,混凝(ning)土抗凍(dong)(dong)臨界(jie)強度(du)(du)應達到(dao)3.5MPa,否則(ze)必須采(cai)(cai)(cai)用(yong)(yong)保(bao)溫(wen)(wen)措施。
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