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style="font-size:16px;font-family:SimSun;">混凝土浇{成型之后,采用塑性薄膜等L材料?qing)时?gu)؜凝土的外露面q行覆盖L。及(qing)时覆盖加强早期养护,既可利用水惔自n的水化热L混凝土,又可大大减少混凝土的早期收羃Q抑制裂~的产生。高性能混凝土施工也有类似的规定。高性能混凝土施工要求,混凝土浇{成型后Q采用塑料薄膜等L材料?qing)时?gu)؜凝土外露面进行覆盖养护,?qing)时覆盖Q加强早期养护,可大大减高性能混凝土早期的收羃Q抑制裂~的产生?/span> </p> <p> <span style="font-size:16px;font-family:SimSun;">   芯模振动、径向挤压工艺管脱模后,?qing)时用塑料布制成的罩覆盖。有的厂q将塑料|的中部、底部收紧,或底部带有重物,防止表面失水Q减热气外逸;在室外养护不用塑料罩Ӟ要及(qing)时覆盖潮湿的物品Q要防止阛_直射Q有些厂在管子脱模后Q立即修_(d)待؜凝土表面收浆后,立即~绕宽幅塑料薄膜Qƈ管子上端包裹封闭,要包裹严密ƈ保持数日Q充分利用؜凝土中水泥的水化热和水分L混凝土?/span> </p> <p style="text-align:center;"> <span style="font-size:16px;font-family:SimSun;"><img src="/uploads/image/20180704/20180704101216_1963.jpg" alt="" /><br /> </span> </p> <p> <span style="font-size:16px;font-family:SimSun;">  二、蒸汽养?/span> </p> <p> <span style="font-size:16px;font-family:SimSun;">   蒸汽L应尽可能的采用高效节能的L设施Q考虑到管子的规格和放|方式,注意提高设施的填充系敎ͼ每个L工位都应有蒸汽调节阀和测温原件?/span> </p> <p> <span style="font-size:16px;font-family:SimSun;">   蒸汽L制度分ؓ(f)预养期、升温期、恒温期和降温期?/span> </p> <p> <span style="font-size:16px;font-family:SimSun;">   预养期的实质是在蒸汽L前提高水泥的水化E度Q混凝土具有一定的初始l构强度Q增强抵抗升温期对结构破坏作用的能力。(f)界初期结构强度是指在一定的L制度下,能获得؜凝土强度和密实度较高Q残余变形较?yu)的较低初期l构强度Q与混凝土原材料、和易性和配合比无兟?/span> </p> <p> <span style="font-size:16px;font-family:SimSun;">   升温期加速了(jin)水惔的水化反应,凝胶体密实度提高、晶相含量增加,有利于؜凝土的结构Ş成,同时升温期也是造成混凝土结构破坏的主要阶段Q其主要原因是؜凝土各组分的热膨胀?/span> </p> <p> <span style="font-size:16px;font-family:SimSun;">  <a href="http://bjjhd.cn/gjhntpsg/" target="_blank">钢筋混凝土排水管</a>成型工艺不同Q؜凝土拌合物稠度跨度很大,有带内外模、带外模或脱模蒸汽养护三U不同情况,使用不同的水泥和矿物掺合料应l合考虑q些因素Q要规定预养期?/span> </p> </div> <div id="7kyjme2" class="pagess"> <ul> <div>上一?<a href="45.html">遵义?jng)井萍؜凝土有限公司谈排污尺寸?qing)相关介绍</a></div> <div>下一?<a href="43.html">房屋排水道施工步骤?qing)注意事?/a></div> </ul> </div> <div id="wvjbgim" class="info_key"> <span>此文关键字:(x)</span> <a href='/key.aspx?k=%e6%8e%92%e6%b0%b4%e7%ae%a1'>排水?/a>,<a href='/key.aspx?k=%e9%92%a2%e7%ad%8b%e6%b7%b7%e5%87%9d%e5%9c%9f%e6%8e%92%e6%b0%b4%e7%ae%a1'>钢筋混凝土排水管</a>, </div> </div> <div id="dcy2qcd" 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