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我国水惔产量大,生äñ”企业多,材料来源òqѝ€‚不同水泥矿化成份复杂,加上混合材料品种多,外加剂用于不同品¿Uæ°´æ³¥æŠ€æœ¯æ•ˆæžœåŒºåˆ«å¾ˆå¤§ã€‚因此,外加剂对不同水惔存在着相溶æ€?适应æ€?问题。这是长期以来困挠施工技术äh员的技术难题。接下来ž®ç¼–æ ÒŽ®ç›¸å…³èµ„料及施工实践,对解军_¤–加剂与几¿Uç‰¹ŒDŠæ°´æ³¥é€‚应性的问题措施作几ç‚ÒŽŽ¢è®¨ã€?br /> <br /> 1、高¼„±æ°´æ³?br /> <br /> 水惔中的可溶性碱通常以Na2O当量表示åQŒå®ƒä¸»è¦æ¥æºäºŽç”Ÿäº§æ°´æ³¥çš„¾_˜åœŸåŠæ؜合材中,适量的可溶性碱有利于促˜q›æ°´æ³¥æ°´åŒ–,更有利于混凝土早期强度发展。试验证明,水惔混凝土流动性随着¼„±å«é‡çš„增加而提高。但是到达一定量åQŒæ°´æ³¥ä¼šæ€¥å‰§æ°´åŒ–åQŒæ°´æ³¥æµ†‹¹åŠ¨æ€§å¤§òq…度下降。掺入减水剂后塑化效果也明显降低ã€?br /> <br /> 产生上述现象的原因一般认为,水惔中的¼„±å¯¹é“é…¸ä¸‰é’™(C3A)的溶å‡ÞZñ”生了促进作用åQŒæ­¤æ—¶æ°´æ³¥åœ¨è°ƒå‡å‰‚CaSO4参预下很快åŞ成了一定的AFt晶体åQŒåƈ包裹在C3A表面åQŒé˜»æ­¢äº†C3A直接水化形成铝酸钙,改善了水泥浆的流动性。但是如果水泥中¼„±å«é‡è¿‡é«˜ï¼Œç”׃ºŽåˆå§‹ž®±æœ‰å¤§é‡AFt晶体形成åQŒåè€Œä‹É‹¹åŠ¨åº¦ä¸‹é™ï¼Œå‡æ°´å‰‚用于上˜q°æ°´æ³¥é€‚应性必然会降低。主要表现在减水率不够,塑化效果差,坍落度经时损å¤ÞqŽ‡é«˜ã€?br /> <br /> 在ä‹É用高¼„±æ°´æ³¥æ—¶åQŒå¦‚釆用低硫酸盐含量的减水剂åQŒä‹É用效果差。而如果采用硫酸盐含量较高的减水剂(¼‹«é…¸é’ å«é‡ç™¾åˆ†ä¹‹äºŒåä»¥ä¸Š)使用效果却会明显改善。这主要是,低浓减水剂所含CaSO4是在合成中和时äñ”生,水溶性很好,在水泥中矌™†ž®šæœªæº¶è§£æ—¶å°±å¤§é‡æº¶äºŽæ°´ä¸­åQŒå½“较高的碱加快C3A溶出æ—Óž¼Œå› æ°´ä¸­å·²æœ‰å¤§é‡SO3存在åQŒä¸ŽC3A反应åQŒåŞ成AFtåQŒä»Žè€Œé˜»æ­¢äº†å› åŞ成铝酔R’™è€Œå¯¼è‡´çš„‹¹åŠ¨æ€§ä¸‹é™ï¼Œòq¶å‡ž®äº†åè½åº¦æŸå¤±ã€‚不隄¡œ‹å‡ºï¼Œ¼‹«é…¸é’ å«é‡é«˜çš„减水剂更能适应高碱水惔ã€?br /> <br /> 许多聚羧酸减水剂PHå€ÆD¾ƒä½Žï¼Œå¦‚与柠檬酸等酸性缓凝剂合用寚w«˜¼„±æ°´æ³¥éš¾ä»¥é€‚应。主要是酸性外加剂掺入高碱水惔后,会迅速äñ”生酸¼„׃¸­å’Œæ”¾çƒ­ååº”,温度急剧上升åQŒä¸ä½†ä¿ƒä½¿æ°´æ³¥è¿…速水化,大量水化热放更会产生恶性åó@环,所配制的æ؜凝土不但‹¹åŠ¨æ€§å·®åQŒåè½åº¦å¾ˆå¯èƒ½åœ¨å¾ˆçŸ­çš„时间内消失。但如果采用其它¼„±æ€§ç¼“凝剂则可避免上述现象的äñ”生ã€?br /> <br /> 2、低¼„Þq¼º¼‹«æ°´æ³?br /> <br /> 水惔中可溶性碱非常好的含量一般认为应该是癑ֈ†ä¹‹é›¶ç‚¹å››åˆ°ç™¾åˆ†ä¹‹é›¶ç‚¹å…­ã€‚通常ž®†ç¢±å«é‡ä½ŽäºŽç™‘Öˆ†ä¹‹é›¶ç‚¹å››çš„水泥称ä¸ÞZ½Ž¼„±æ°´æ³¥ã€‚而水溶性碱多以¼„Þqš„¼‹«é…¸ç›å­˜åœ¨ï¼Œæ‰€ä»¥ä¹Ÿž®†ä½Ž¼„±æ°´æ³¥ç§°ä¸ºç¼º¼‹«æˆ–‹Æ ç¡«æ°´æƒ”ã€?br /> <br /> ¾~ºç¡«æ°´æƒ”掺入减水剂通常‹¹åŠ¨æ€§è¾ƒå·®ï¼Œè€ŒåŠ å¤§å‡æ°´å‰‚用量虽然有一定效果,但更会加大æ؜凝土泌水åQŒæ‰€é…åˆ¶çš„æ؜凝土匀质性差åQŒåè½åº¦æŸå¤±å¿«ï¼Œå› æ­¤å¸¸ç”¨å‡æ°´å‰‚很éšùN€‚应åQŒå³ä½¿å°†¾~“凝剂用量成倍增加也毫无作用ã€?br /> <br /> 不难看出åQŒç¼º¼‹«æ°´æ³¥äñ”生上˜qîC¸é€‚应现象的根本原因是ç”׃ºŽæ°´æƒ”中SO3不够åQŒé™ä½Žäº†é˜ÀL­¢æ°´æƒ”中C3A的水化效果,C3A对外加剂的迅速大量吸附也降低了减水剂塑化功能。因此只有补充可溶性碱(¼‹«é…¸ç›?对解决低¼„Þq¼º¼‹«æ°´æ³¥é€‚应性问题有效。而常用的加大¾~“凝剂用量的æ–ÒŽ³•æ•ˆæžœòq¶ä¸æ˜Žæ˜¾ã€?br /> <br /> 3、C3A含量高的水惔<br /> <br /> 水惔的主要成份äؓC3S、C2S、C3A½{‰ï¼Œ˜q™äº›çŸ¿åŒ–成䆾其吸附活性顺序通常认äؓ应该是C3A>C3S>C2SåQŒå…¶ä¸­C3A对减水剂的吸附量非常大,因此在减水剂掺量一定时åQŒæ؜凝土‹¹åŠ¨æ€§éšç€C3A含量加大而降低。坍落度¾læ—¶æŸå¤±çŽ‡ä¹Ÿéšä¹‹åŠ å¤§ã€‚这主要是由于掺入减水剂大都会被C3A吔R™„åQŒè€Œå ä¸»è¦çš„矿化成份C3S却没有èƒö够的减水剂去吔R™„分散åQŒè€Œä‹É水惔‹¹†æµåŠ¨æ€§é™ä½Žã€‚多‹Æ¡è¯•éªŒçœ‹å‡ºï¼Œæ°´æƒ”中C3A含量­‘…过癑ֈ†ä¹‹å…«åQŒå³ä¼šå¯¹æ··å‡åœŸæµåŠ¨æ€§äñ”生不利媄响ã€?br /> <br /> 试验证明åQŒè¡¥å……水泥浆中SO3即采用硫酸盐含量高的减水剂有一定效果。同æŽÞZ¸€å®šæ•°é‡çš„¾ŸŸåŸº¾Ÿ§é…¸ç›ç¼“凝剂åQŒä¹Ÿèƒ½é˜»æ­¢C3A的吸附水化,而采ç”?b>多元é†?/b>½{‰ç¼“凝剂效果不明显。还可以采用价钱低廉的减水剂òq‰™€‚当加大掺用量,满èƒöC3A吔R™„òq¶æœ‰è¾ƒå¤šå‰©ä½™å‡æ°´å‰‚去改善C3S½{‰çŸ¿åŒ–成份的‹¹åŠ¨æ€§ã€‚由于此¾cÕd‡æ°´å‰‚价钱低廉åQŒä¸ä¼šåŠ å¤§ä‹É用成本ã€?br /></p> </div> <div class="tag"> <p>相关标签åQ?a href='/key.aspx?k=%be%db%ba%cf%b4%bc%b0%b7'>聚合醇胺</a>,</p> <p><div>上一æ?<a href="398.html">你问我答 | 助磨剂质量差的话åQŒä¸ä½†ä¸åŠ©ç£¨åè€Œç£¨æœÞZñ”量下降吗åQŸå‡º½H‘熟料量的改变是由哪些因素媄响的呢?</a></div> <div>下一æ?<a href="396.html">聚醚多元醇行业概˜q?/a></div> </p> </div> <div class="related_pro"> <h4>相关产品</h4> <ul> <li class="col-lg-3 col-md-3 col-sm-6 col-xs-12 text-center"> <div class="related_img"><a href="/supply/2.html" title="新型聚合多元é†? rel="nofollow"><img src="http://cmsimgshow.zhuchao.cc/10522/201806201031483301052239290.jpg?path=www.net2godemo.com/uploads/cp/201806201031483301052239290.jpg" alt="新型聚合多元é†? class="img-responsive"/></a></div> <span><a href="/supply/2.html" 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