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外加剂用于不同品种水泥技术效果区别很大——聚合醇胺生产厂?- 洛阳奥百思特水泥技术有限公?/title>
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<h1>外加剂用于不同品种水泥技术效果区别很大——聚合醇胺生产厂?/h1>
<p>来源?a href='http://www.0532dna.com/news/397.html'>http://www.0532dna.com/news/397.html</a></p>
<p>发布时间 : 2023-05-05</p>
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<p><a target="_blank" href="http://www.0532dna.com/news/397.html">外加剂用于不同品种水泥技术效果区别很大—?b><a href="http://www.0532dna.com/" target="_blank" style="font-weight:bold">聚合醇胺</a></b>生产厂家</a><br />
我国水泥产量大，生产企业多，材料来源广。不同水泥矿化成份复杂，加上混合材料品种多，外加剂用于不同品种水泥技术效果区别很大。因此，外加剂对不同水泥存在着相溶?适应?问题。这是长期以来困挠施工技术人员的技术难题。接下来小编根据相关资料及施工实践，对解决外加剂与几种特殊水泥适应性的问题措施作几点探讨?br />
<br />
1、高碱水?br />
<br />
水泥中的可溶性碱通常以Na2O当量表示，它主要来源于生产水泥的粘土及混合材中，适量的可溶性碱有利于促进水泥水化，更有利于混凝土早期强度发展。试验证明，水泥混凝土流动性随着碱含量的增加而提高。但是到达一定量，水泥会急剧水化，水泥浆流动性大幅度下降。掺入减水剂后塑化效果也明显降低?br />
<br />
产生上述现象的原因一般认为，水泥中的碱对铝酸三钙(C3A)的溶出产生了促进作用，此时水泥在调凝剂CaSO4参预下很快形成了一定的AFt晶体，并包裹在C3A表面，阻止了C3A直接水化形成铝酸钙，改善了水泥浆的流动性。但是如果水泥中碱含量过高，由于初始就有大量AFt晶体形成，反而使流动度下降，减水剂用于上述水泥适应性必然会降低。主要表现在减水率不够，塑化效果差，坍落度经时损失率高?br />
<br />
在使用高碱水泥时，如釆用低硫酸盐含量的减水剂，使用效果差。而如果采用硫酸盐含量较高的减水剂(硫酸钠含量百分之二十以上)使用效果却会明显改善。这主要是，低浓减水剂所含CaSO4是在合成中和时产生，水溶性很好，在水泥中石膏尚未溶解时就大量溶于水中，当较高的碱加快C3A溶出时，因水中已有大量SO3存在，与C3A反应，形成AFt，从而阻止了因形成铝酸钙而导致的流动性下降，并减小了坍落度损失。不难看出，硫酸钠含量高的减水剂更能适应高碱水泥?br />
<br />
许多聚羧酸减水剂PH值较低，如与柠檬酸等酸性缓凝剂合用对高碱水泥难以适应。主要是酸性外加剂掺入高碱水泥后，会迅速产生酸碱中和放热反应，温度急剧上升，不但促使水泥迅速水化，大量水化热放更会产生恶性循环，所配制的混凝土不但流动性差，坍落度很可能在很短的时间内消失。但如果采用其它碱性缓凝剂则可避免上述现象的产生?br />
<br />
2、低碱缺硫水?br />
<br />
水泥中可溶性碱非常好的含量一般认为应该是百分之零点四到百分之零点六。通常将碱含量低于百分之零点四的水泥称为低碱水泥。而水溶性碱多以碱的硫酸盐存在，所以也将低碱水泥称为缺硫或欠硫水泥?br />
<br />
缺硫水泥掺入减水剂通常流动性较差，而加大减水剂用量虽然有一定效果，但更会加大混凝土泌水，所配制的混凝土匀质性差，坍落度损失快，因此常用减水剂很难适应，即使将缓凝剂用量成倍增加也毫无作用?br />
<br />
不难看出，缺硫水泥产生上述不适应现象的根本原因是由于水泥中SO3不够，降低了阻止水泥中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(硫酸?对解决低碱缺硫水泥适应性问题有效。而常用的加大缓凝剂用量的方法效果并不明显?br />
<br />
3、C3A含量高的水泥<br />
<br />
水泥的主要成份为C3S、C2S、C3A等，这些矿化成份其吸附活性顺序通常认为应该是C3A>C3S>C2S，其中C3A对减水剂的吸附量非常大，因此在减水剂掺量一定时，混凝土流动性随着C3A含量加大而降低。坍落度经时损失率也随之加大。这主要是由于掺入减水剂大都会被C3A吸附，而占主要的矿化成份C3S却没有足够的减水剂去吸附分散，而使水泥浆流动性降低。多次试验看出，水泥中C3A含量超过百分之八，即会对混凝土流动性产生不利影响?br />
<br />
试验证明，补充水泥浆中SO3即采用硫酸盐含量高的减水剂有一定效果。同掺一定数量的羟基羧酸盐缓凝剂，也能阻止C3A的吸附水化，而采?b><a href="http://www.0532dna.com/" target="_blank" style="font-weight:bold">多元?/a></b>等缓凝剂效果不明显。还可以采用价钱低廉的减水剂并适当加大掺用量，满足C3A吸附并有较多剩余减水剂去改善C3S等矿化成份的流动性。由于此类减水剂价钱低廉，不会加大使用成本?br /></p>
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<p>相关标签?a href='/key.aspx?k=%e8%81%9a%e5%90%88%e9%86%87%e8%83%ba'>聚合醇胺</a>,</p>
<p><div>上一?<a href="398.html">你问我答 | 助磨剂质量差的话，不但不助磨反而磨机产量下降吗？出窑熟料量的改变是由哪些因素影响的呢？</a></div>
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