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<p>聚羧酸系高性能減水劑不同于萘系高效減水劑之處在于：一是分子結構的多樣性和可調節性；二是把高效減水劑的優(yōu)點(diǎn)進(jìn)一步濃縮和提高，并且在生產(chǎn)過(guò)程中實(shí)現了綠色無(wú)污染。</p><p>1.作用機理上，聚羧酸系減水劑分子結構呈梳型，主鏈很強的極性陰離子“錨固”基團用以吸附在水泥顆粒上，由眾多支鏈支撐的向外伸展的梳齒結構為水泥粒子的進(jìn)一步分散提供了充分的空間排列效應。相比于萘系減水劑的雙電層電性斥力作用，空間位阻作用使分散保持的時(shí)間要長(cháng)得多。適當改變聚羧酸減水劑梳型結構，使側鏈密度與長(cháng)度適當變化，可得到適用于預制構件用的高減水、高早強型減水劑。聚羧酸系減水劑可按要求來(lái)調整、改變分子結構，達到改變性能的目的，而不是用簡(jiǎn)單復配來(lái)改性，基于這種認識，或許對我們今后應用技術(shù)的提高有所啟發(fā)。</p><p>2、聚羧酸系減水劑對膠結材料適應性問(wèn)題不同品種水泥，聚羧酸系減水劑的飽和點(diǎn)有很大差別，因此對不同水泥找飽和點(diǎn)十分重要。但使用方若規定只準摻1.0%，在此摻量下如果選用的水泥適應性不好，外加劑提供方則很難辦，采用復配的辦法往往收效甚微。</p><p>一級灰適應性好，二、三級灰不適應情況較多，此時(shí)即使加大聚羧酸摻量效果也不明顯。常常是某一種水泥或粉煤灰對外加劑適應性不好時(shí)，當你換另外一種外加劑仍不能完全滿(mǎn)意，最終可能還得更換膠凝材料。</p><p>3、砂子含泥量問(wèn)題當砂子含泥量較高時(shí)，聚羧酸系減水劑減水率會(huì )明顯降低。使用萘系減水劑往往用增加一些摻量來(lái)解決，而聚羧酸系減水劑在增加摻量時(shí)變化不明顯，很多情況是當流動(dòng)度還沒(méi)達到要求，混凝土已開(kāi)始泌水。此時(shí)調砂率、增加含氣量或加增稠劑效果都不會(huì )很好。最好的辦法還是降低含泥量。</p><p>4、引氣性問(wèn)題聚羧酸系減水劑在生產(chǎn)過(guò)程中往往會(huì )保留一些降低表面張力的表面活性成分，因此它具有一定引氣性。這些活性成分不同于傳統引氣劑，引氣劑的生產(chǎn)過(guò)程中由于考慮到了產(chǎn)生穩定、細小、封閉氣泡的一些必要條件，引氣劑中會(huì )增加這些有效成分，從而使帶入混凝土的氣泡既能滿(mǎn)足含氣量的要求，又不會(huì )對強度等性能產(chǎn)生不利影響。聚羧酸系減水劑在生產(chǎn)過(guò)程中，含氣量有時(shí)可高達8%左右，如果直接使用對強度影響是不利的，因此目前采取的做法是先消泡、再引氣。消泡劑廠(chǎng)家往往可以提供，而引氣劑有時(shí)需要應用單位自己選擇。</p><p>5、聚羧酸減水劑摻量問(wèn)題聚羧酸減水劑摻量低、減水率高、坍落度保持好，但在應用中也出現以下問(wèn)題：①摻量在水膠比小時(shí)十分敏感，且表現出有更高減水率，而在水膠比大時(shí)（0.4以上時(shí)），減水率及其變化就不那么明顯了，可能與聚羧酸系減水劑作用機理有關(guān)，它的分散、保持作用在于分子結構形成的空間位阻效應，大水膠比時(shí)水泥分散體系中已經(jīng)有足夠水分子的間隔作用，因此聚羧酸分子的空間位阻作用自然要小。②膠凝材料用量大時(shí)摻量影響更為明顯。在相同條件下，當膠凝材料總量<300㎏/m3的減水作用要小于>400㎏/ m3時(shí)的減水率，而且在水膠比大，凝材料用量小時(shí)還會(huì )有疊加效果。聚羧酸減水劑是針對高性能混凝土而研制的，所以它的性能、價(jià)位都更適合應用于高性能混凝土。</p><p>6、關(guān)于聚羧酸系減水劑的復配問(wèn)題聚羧酸減水劑不能與萘系減水劑復配，兩種減水劑若使用同一設備，在未徹底清洗干凈時(shí)也會(huì )產(chǎn)生影響。因此現在往往要求聚羧酸系減水劑最好單獨使用一套設備。根據目前使用情況，引氣劑與聚羧酸鹽復配相容性較好，很大的原因是引氣劑摻量低，能與聚羧酸系減水劑“相溶”才能進(jìn)一步相容、互補。緩凝劑中的葡萄糖酸鈉相容性也較好，而與其他無(wú)機鹽類(lèi)外加劑相容性較差，難以復配。7、關(guān)于聚羧酸系減水劑的PH值問(wèn)題聚羧酸系減水劑PH值較其他高效減水劑偏低，有些只有6—7，因此都要求貯存于玻璃鋼、塑料等容器中，而不能長(cháng)期放于金屬容器中。會(huì )引起聚羧酸系減水劑變質(zhì)，而且經(jīng)長(cháng)期的酸性侵蝕，影響金屬容器的壽命及貯運系統的安全性。</p> </div> <div id="b9vz5ld" class="ui-show-tags"> </div> <ul class="content-exp"> <li>上一篇： <a href="/News/282.html" title="聚羧酸減水劑應用中的若干問(wèn)題答疑">聚羧酸減水劑應用中的若干問(wèn)題答疑</a> </li> <li>下一篇： <a href="/News/280.html" title="設計彩色透水混凝土配料表_的依據是什么？">設計彩色透水混凝土配料表_的依據是什么？</a> </li> </ul> </div> </div> </div> </div> </div> <div id="hvbvvd3" class="footer"> <div id="n5ntz99" class="container clearfix"> <div id="lhvbzbd" class="footer-nav"> <a href="/">網(wǎng)站首頁(yè)</a> <a href="/About/">關(guān)于我們</a> <a href="/News/">新聞資訊</a> <a href="/Product/">公司產(chǎn)品</a> <a href="/list/9/">環(huán)衛垃圾桶</a> <a href="/list/10/">塑料托盤(pán)</a> <a href="/Case/">應用案例</a> <a 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