ï»?!doctype html> 水惔混凝土外加剂及其合理应用 - 中山市民众镇¿U‘宝特种建材åŽ?/title> <meta name="Keywords" content=""> <link rel="stylesheet" href="/template/kebao/css/base.css" type="text/css" media="all" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"></div> <div class="wrap2"> <div class="toppic"> <img src="/template/kebao/img/400.jpg" width="1304" height="33" /> </div> <div id="header"> <div class="hwrap"> <div class="logo"><img src="/uploads/logo/20140211024810.gif" alt="中山市民众镇¿U‘宝特种建材åŽ?/></div> <ul class="nav"> <li><a href="/">首页</a></li> <li><a href="/about/">走进¿U‘宝</a></li> <li><a href="/news/">¿U‘宝资讯</a></li> <li><a href="/supply/">产品展示</a></li> <li><a href="/download/">工程案例</a></li> <li><a href="/news/jszc/">技术支æŒ?/a></li> <li><a href="/about/about5.html">客户留言</a></li> <li><a href="/contact/">联系我们</a></li> </ul> </div> </div> <div class="qbanner"><img 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src="/template/kebao/img/a.jpg" width="15" height="15">地址åQšå¹¿ä¸œçœä¸­å±±å¸‚民众镇多宝工业åŒ?/div> </div> </div> <div class="qmainr"> <div class="qtitle"><h2>新闻中心</h2><span>当前位置åQ?a href="/">首页</a> > <a href="/news/hydt/">行业动æ€?/a> > 详细内容</span></div> <div class="clear"></div> <div class="info"> <div class="article_title">水惔混凝土外加剂及其合理应用</div> <div class="article_time">发布旉™—´ : 2014-06-27</div> <div class="edit_line1"><p style="color:#515151;font-family:宋体;font-size:16px;text-indent:21pt;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">水惔混凝土已¾læˆä¸ºçŽ°ä»£ç¤¾ä¼šå¾½{‘的基础用材åQŒåœ¨æ—¥å¸¸ç”Ÿæ´»ä¸­å‡ ä¹Žå„个方面均直接或间接地涉及˜q™ç§å»ºæã€‚随着新结构、新工艺的发展,要求混凝土具有调凝、早强、高强、轻质、高耐久性等性能。现在越来越多的äºø™®¤è¯†åˆ°å¤–加剂是混凝土中除水泥、砂、石和水之外的不可缺ž®‘çš„½W¬äº”¿Uææ–™ã€‚外加剂的应用是混凝土发展史上一‹Æ¡é‡å¤§çš„技术变革,推动了æ؜凝土¿U‘技事业的发展,促进了新的æ؜凝土¾l“构设计理论和施工技术的发展åQŒåŒæ—¶åº”用外加剂可以昄¡€æ”¹å–„混凝土的性能åQŒå‡ž®‘水泥用量,降低混凝土成本,节约能源。所以,混凝土中外加剂的应用有着十分重要的技术和¾læµŽæ„ä¹‰ã€‚但是,需要特别强调的是,外加剂必™åÕdˆç†åº”用,如果使用不当åQŒä¸ä»…达不到预期效果åQŒç”šè‡³ä¼š¾l™æ؜凝土质量带来不良的媄响ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">1 </span></strong><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">混凝土外加剂的分¾c?/span></strong><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  æ ÒŽ®æˆ‘国现行国家标准《æ؜凝土外加剂分¾c…R€å‘½åä¸Žå®šä¹‰ã€?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">GB8075-87</span><span style="font-size:14px;line-height:28px;color:#000000;">åQŒæ؜凝土外加剂是在拌制æ؜凝土的过½E‹ä¸­æŽºå…¥åQŒç”¨ä»¥æ”¹å–„æ؜凝土性能的物质,掺量不大于水泥质量的</span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">5%</span><span style="font-size:14px;line-height:28px;color:#000000;">åQˆç‰¹ŒDŠæƒ…况除外)。从使用功能来看åQŒæ؜凝土外加剂分ä¸ÞZº”¾c»ï¼š<span>â‘?/span>改善新拌混凝土流变性能。减水剂、引气剂、保水剂½{‰ï¼›<span>â‘?/span>调节混凝土凝¾l“、硬化性能。缓凝剂、早强剂ã€?a href="http://www.sa-aa.com/supply/26.html" target="_blank">速凝å‰?/a>½{‰ï¼›<span>â‘?/span>调节混凝土气体含量。引气剂、发气剂、æˆö沫剂、消泡剂½{‰ï¼›<span>â‘?/span>改善混凝土耐久性。引气剂、阻锈剂、抗å†Õd‰‚、抗渗剂、防腐蚀剂等åQ?span>â‘?/span>为æ؜凝土提供ç‰ÒŽ®Šæ€§èƒ½ã€‚发气剂、æˆö沫剂、着色剂、膨胀剂、碱骨料反应抑制剂等ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">2 </span></strong><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">混凝土外加剂的用é€?/span></strong><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.1</span><span style="font-size:14px;line-height:28px;color:#000000;">减水剂减水剂是一¿Uè¡¨é¢æ´»æ€§ææ–™ï¼ŒåŠ å…¥æ··å‡åœŸä¸­åQŒå¯¹æ°´æƒ”颗粒èµäh‰©æ•£ä½œç”¨ï¼ŒæŠŠæ°´æ³¥å‡èšä½“中的游离水释攑ևºæ¥ï¼Œä»Žè€Œä¿æŒæ؜凝土工作性能不变而显着减少用水量、降低水灰比、改善和易性、增加流动性、节¾U¦æ°´æ³¥ã€‚减水剂品种有木质素¾p…R€å¥ˆ¼‚ºé…¸ç›ç³»ã€æ°´æº¶æ€§å¯†èƒºæ ‘脂类、糖密类½{‰ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.2</span><span style="font-size:14px;line-height:28px;color:#000000;">引气剂引气剂可ä‹É砂浆、æ؜凝土中äñ”生大量微¾l†çš„均匀分布的封闭气泡,可以改善混凝土和易性、提高抗渗性、抗å†ÀL€§å’Œè€ä¹…性。引气剂品种有烷基磺酔R’ ã€æ¾é¦™çš‚ã€?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">OP</span><span style="font-size:14px;line-height:28px;color:#000000;">乛_Œ–剂ã€?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">8012</span><span style="font-size:14px;line-height:28px;color:#000000;">½{‰ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.3</span><span style="font-size:14px;line-height:28px;color:#000000;">调凝剂调凝剂是调节水泥凝¾l“时间的外加剂,它对混凝土凝¾l“时间和强度发展影响昄¡€ã€‚调凝剂有缓凝剂、早强剂、速凝剂。缓凝剂是一¿Uåšg˜qŸæ°´æ³¥å’Œæ°´çš„反应åQŒä»Žè€Œåšg长æ؜凝土凝结旉™—´çš„外加剂。缓凝剂品种有硼酸、磷酸ã€?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">NNO</span><span style="font-size:14px;line-height:28px;color:#000000;">、木质磺酔R’™ã€é’ ½{‰ã€‚早强剂可以提高混凝土的早期强度åQŒå¯¹åŠ é€Ÿæ¨¡æ¿å‘¨è½¬ã€åŠ å¿«å·¥½E‹è¿›åº¦ã€èŠ‚¾U¦å†¬æœŸæ–½å·¥è´¹ç”¨æœ‰æ˜Žæ˜¾æ•ˆæžœã€‚早强剂品种有氯化物¾p…R€ç¡«é…¸ç›¾p…R€ä¸‰ä¹™é†‡èƒºã€ç”²é…”R’™½{‰ã€‚速凝剂一般用于喷ž®„或急抢修工½E‹ä¸­åQŒé€Ÿå‡å‰‚可使æ؜凝土几分钟内凝结¼‹¬åŒ–åQŒåƈå…ähœ‰¾_˜ç»“力高½{‰ç‰¹ç‚¹ï¼›ä¸€èˆ¬åˆå‡?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">1min</span><span style="font-size:14px;line-height:28px;color:#000000;">ï½?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">5min</span><span style="font-size:14px;line-height:28px;color:#000000;">åQŒç»ˆå‡?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2min</span><span style="font-size:14px;line-height:28px;color:#000000;">ï½?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">10min</span><span style="font-size:14px;line-height:28px;color:#000000;">。速凝剂品¿Uæœ‰¾U¢æ˜Ÿä¸€åž‹ã€?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">711</span><span style="font-size:14px;line-height:28px;color:#000000;">型ã€?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">782</span><span style="font-size:14px;line-height:28px;color:#000000;">型等ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.4</span><span style="font-size:14px;line-height:28px;color:#000000;">膨胀剂膨胀剂是混凝土或砂浆因发生化学反应而äñ”生膨胀的外加剂åQŒä¸»è¦ä½œç”¨æ˜¯è¡¥å¿æ··å‡åœŸæ”¶¾~©ã€‚膨胀剂äñ”品有¼‹«é“é…”R’™ã€çŸ³è†ã€é“¾_‰ã€çŸ³ç°ã€æ˜ŽçŸ„¡Ÿ³½{‰ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.5</span><span style="font-size:14px;line-height:28px;color:#000000;">加气剂æ؜凝土中加入加气剂åQŒå¯ä»¥ä‹É加气剂与水惔中的¼„±ååº”生成气体åŞ成无数微子独立的气æˆöåQŒç”ŸæˆåŠ æ°”æ؜凝土。加气剂的äñ”品有鳞片状的铝粉、松香酸钠、松香热聚物½{‰ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.6</span><span style="font-size:14px;line-height:28px;color:#000000;">泡沫剂æˆö沫剂能降低溶液表面张力,产生均匀而稳定的泡沫åQŒç”Ÿæˆæˆö沫æ؜凝土。æˆö沫剂˜q˜å…·æœ‰å¼ºçƒˆå‡¾~“凝聚的作用。æˆö沫剂产品有松香皂、动物毛、树脂皂素脂、石油磺酔R“½{‰ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.7</span><span style="font-size:14px;line-height:28px;color:#000000;">阻锈剂阻锈剂是阻止或减少混凝土中钢筋或金属预埋äšg发生锈蚀作用的外加剂。阻锈剂有苯甲酸盐、磷酸盐、氟¼‹…酸盐、氯铝酸盐等ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">2.8</span><span style="font-size:14px;line-height:28px;color:#000000;">抗冻剂抗å†Õd‰‚是降低æ؜凝土中水的冰点的一¿Uå¤–加剂åQŒæŠ—å†Õd‰‚品种有氯化钙、氯化钠、亚销酔R’ ã€æ°}水、尿素等ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">3 </span></strong><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">外加剂在工程中的应用</span></strong><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.1</span><span style="font-size:14px;line-height:28px;color:#000000;">æ ÒŽ®å·¥ç¨‹ç‰¹ç‚¹é€‰ç”¨åˆé€‚的外加剂几乎各¿Uæ؜凝土都可以掺用外加剂åQŒä½†å¿…é¡»æ ÒŽ®å·¥ç¨‹æ··å‡åœŸä¸åŒçš„标准要求、施工条件和施工工艺½{‰é€‰æ‹©åˆé€‚的外加剂种¾c…R€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.2</span><span style="font-size:14px;line-height:28px;color:#000000;">注意外加剂的质量目前我国外加剂牌号众多,诸多厂家未明显标½Cºå…¶äº§å“å“ç§åQŒè€Œä¸”质量不一åQŒå› æ­¤ï¼Œåœ¨å·¥½E‹åº”用前åQŒåº”按照质量标准对其选择好的外加剂进行掺量及混凝土性能试验ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.3</span><span style="font-size:14px;line-height:28px;color:#000000;">注意水惔品种的选择在外加剂材料中,水惔对减水剂的媄响最大。水泥品¿Uä¸åŒï¼Œž®†åª„响减水剂的减水、增强效果,其中对减水效果媄响更明显ã€?a href="http://www.sa-aa.com/supply/48.html" target="_blank">高效减水å‰?/a>å¯ÒŽ°´æ³¥æ›´æœ‰é€‰æ‹©æ€§ï¼Œä¸åŒæ°´æƒ”其减水率的相差较大,水惔矿物¾l„成、掺和料、调凝剂、碱含量、细度等都将影响减水剂的使用效果åQŒå› æ­¤ï¼ŒåŒä¸€¿Uå‡æ°´å‰‚在相同的掺量下,往往因水泥不同而ä‹É用效果明显不同,或同一¿Uå‡æ°´å‰‚åQŒåœ¨ä¸åŒæ°´æƒ”中äؓ了达到相同的减水增强效果åQŒå‡æ°´å‰‚的掺量也明显不同。当减水剂可供选择æ—Óž¼Œåº”选择与施工用水惔较äؓ适应的减水剂åQŒä‹É减水剂发挥更好效果,在ä‹É用前åQŒåº”˜q›è¡Œæ°´æƒ”与外加剂适应性试验ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.4</span><span style="font-size:14px;line-height:28px;color:#000000;">注意掌握掺量每种外加剂都有适宜的掺量,即ä‹É同一¿Uå¤–加剂åQŒä¸åŒçš„用途有不同的适宜的掺量。掺量过大,不仅在经‹¹Žä¸Šä¸åˆç†ï¼Œè€Œä¸”可能造成质量事故。高效减水剂掺量˜q‡å°åQŒå¤±åŽ»é«˜æ•ˆèƒ½ä½œç”¨åQŒè€ŒæŽºé‡è¿‡å¤§ï¼Œåˆ™ä¼šç”׃ºŽæ³Œæ°´è€Œåª„响质量ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.5</span><span style="font-size:14px;line-height:28px;color:#000000;">注意调整混凝土的配合比一般地è¯ß_¼Œå¤–加剂对混凝土配合比没有ç‰ÒŽ®Šè¦æ±‚åQŒå¯æŒ‰æ™®é€šæ–¹æ³•è¿›è¡Œè®¾è®¡ã€‚但在减水或节约水惔的情况下åQŒåº”对砂率、水泥用量、水灰比½{‰ä½œé€‚当调整ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.5.1</span><span style="font-size:14px;line-height:28px;color:#000000;">砂率砂率å¯ÒŽØœå‡åœŸçš„和易性媄响很大。过高的砂率不仅影响混凝土强度,也会¾l™æ؜凝土塑性收¾~©å¢žå¤§ã€‚具体配比应ç”Þp¯•é…ç»“果来¼‹®å®šã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.5.2</span><span style="font-size:14px;line-height:28px;color:#000000;">水惔用量混凝土中掺用减水剂均有不同程度节¾U¦æ°´æ³¥çš„效果åQŒä‹É用普通减水剂可节¾U?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">5%</span><span style="font-size:14px;line-height:28px;color:#000000;">ï½?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">10%</span><span style="font-size:14px;line-height:28px;color:#000000;">åQŒé«˜æ•ˆå‡æ°´å‰‚可节¾U?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">10%</span><span style="font-size:14px;line-height:28px;color:#000000;">ï½?/span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">20%</span><span style="font-size:14px;line-height:28px;color:#000000;">ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.5.3</span><span style="font-size:14px;line-height:28px;color:#000000;">水灰比掺减水剂æ؜凝土的水灰比应根据所掺品¿Uçš„减水率确定ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.6</span><span style="font-size:14px;line-height:28px;color:#000000;">注意施工特点</span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.6.1</span><span style="font-size:14px;line-height:28px;color:#000000;">在搅拌过½E‹ä¸­è¦ä¸¥æ ¼æŽ§åˆ¶å‡æ°´å‰‚和水的用量,选用合适的掺加æ–ÒŽ³•å’Œæ…拌时é—ß_¼Œä¿è¯å‡æ°´å‰‚充分è“v作用。对于不同的掺加æ–ÒŽ³•åº”有不同的工è‰ø™¦æ±‚和注意事项ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.6.2</span><span style="font-size:14px;line-height:28px;color:#000000;">注意掺外加剂åQˆå°¤å…¶æ˜¯æ—©å¼ºå‰‚或早强减水剂)的æ؜凝土坍落度损å¤×ƒ¸€èˆ¬è¾ƒå¿«ï¼Œåº”羃短运输及停放旉™—´åQŒä¸€èˆ¬ä¸­‘…过</span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">30min</span><span style="font-size:14px;line-height:28px;color:#000000;">åQŒå¦åˆ™è¦ç”¨åŽæŽºæ³•ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:14px;line-height:28px;font-family:'Times New Roman';color:#000000;">3.6.3</span><span style="font-size:14px;line-height:28px;color:#000000;">注意混凝土灌½{‘成型操作æ؜凝土在灌½{‘时要注意保持其匀质性,避免¼›ÀLžã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  在选用外加剂时åQŒåº”æ ÒŽ®å·¥ç¨‹æ–½å·¥æ··å‡åœŸçš„质量要求、施工工艺条件、采用的施工æ–ÒŽ³•ã€çŽ¯å¢ƒæ°”温情况及光™‡‡å–的措施合理选用外加剂品¿Uï¼ŒåŒæ—¶åœ¨ä¿è¯å¤–加剂质量的前提下åQŒåŒå“ç§ã€åŒæ ïL”¨é€”和辑ֈ°æ··å‡åœŸä‹É用效果时的外加剂一定要货比三家åQŒå°½é‡è¦ä½ŽæŽºé‡ï¼Œä»äh ¼åˆç†ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  </span><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">4 </span></strong><strong><span style="font-size:14px;line-height:28px;font-weight:normal;color:#000000;">¾l“语</span></strong><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p style="color:#515151;font-family:宋体;font-size:16px;background-color:#F9FDFF;"> <span style="font-size:14px;line-height:28px;color:#000000;">  随着世界建筑业的蓬勃发展åQŒæ؜凝土在各¾cÕd·¥½E‹å¾è®¾ä¸­èµïL€æ—¥ç›Šå·¨å¤§çš„作用。作随着混凝土技术的发展åQŒé«˜å¼ºåº¦é«˜æ€§èƒ½æ··å‡åœŸçš„应用­‘Šæ¥­‘Šå¹¿æ³›ï¼Œä½œäؓ混凝土组分之一的外加剂åQŒä»¥å…¶ç‰¹æœ‰çš„技术性和工作性在混凝土工½E‹ä¸­­‘Šå‘昑־—必不可少。由于外加剂¿Uç±»¾Jå¤šåQŒå·¥½E‹çš„技术要求不ž®½ç›¸åŒï¼Œè¦æ­£¼‹®åˆç†åœ°ä½¿ç”¨å¥½å¤–加剂åQŒå°±è¦ç†Ÿæ‚‰å›½å®¶çŽ°è¡Œçš„各种外加剂标准和工程标准。前者是ä¸ÞZº†äº†è§£å•†å“çš„性能åQŒåŽè€…是工程的实际要求,二者缺一不可ã€?/span><span style="font-size:10.5pt;line-height:28px;font-family:'Times New Roman';"></span> </p> <span style="font-family:宋体;background-color:#FFFFFF;font-size:14px;"></span> <p class="MsoNormal" style="color:#515151;font-family:宋体;font-size:16px;background-color:#FFFFFF;"> <span style="font-size:14px;color:#000000;"> </span> </p> <p style="color:#f000"><div>上一æ?<a href="35.html">混凝土高效减水剂的作ç”?/a></div> <div>下一æ?<a href="33.html">òq¿ä¸œä»Šå¹´å…¨çº¿å¼€å·¥å¾è®¾æ·±èŒ‚铁路江门到茂名ŒD?/a></div> 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