七种混凝土外加剂作用介绍,混凝土中为什么要用外加剂?
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</span><span style="color: green;">混凝土外加剂是在混凝土搅拌前或者搅拌中加入的一种材料,主要目的是用来改善新拌混凝土或者硬化混凝土的性能。</span><span style="color: green;">现在施工要求越来越高,对混凝土提出了各种要求,比如大流动性、早强、高强、速凝、缓凝、抗冻、抗渗透、低水化热等各种性能要求。</span>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">混凝土外加剂是一种能够改善混凝土性能的化学物质,其种类繁多。为了确保混凝土质量,选择适当的混凝土外加剂非常重要。本文将介绍一些常见的混凝土外加剂。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">01</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">减水剂</strong></p><img src="https://mmbiz.qpic.cn/mmbiz_gif/bL2iaicTYdZn7XRxFdxic6iazSIGSWJU5KJmnafOeicXBOgxQO8TsIVmWhk3yQmbFlyPliav3V8wTicN2oK6GjRiarCpzw/640?wx_fmt=gif&wxfrom=5&wx_lazy=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/5kZwgePJyg0c4mzvib0m97KVB2Y4iaoharibBz5KQpRESsbpFeiaiagYbhdWhX0RglicRaPiasdGb4lH4licrStVpiaZhRA/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">减水剂是一种在维持混凝土</span><span style="color: green;">坍落度</span><span style="color: green;">基本不变的条件下,能减少拌合用水量的混凝土外加剂。大多属于</span><span style="color: green;">阴离子表面活性剂</span><span style="color: green;">,有</span><span style="color: green;">木质素磺酸盐</span><span style="color: green;">、萘磺酸盐甲醛聚合物等。加入</span><span style="color: green;">混凝土拌合物</span><span style="color: green;">后对水泥颗粒有分散</span><span style="color: green;">作用</span><span style="color: green;">,能改善其工作性,减少单位用水量,改善混凝土拌合物的流动性;或减少单位水泥用量,节约水泥。<span style="color: green;">同时,可明显提高混凝土的耐久性。</span></span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">联系方式:北京市朝阳区管庄东里甲1号,中国建筑材料科学研究总院北楼</span></p><img src="https://mmbiz.qpic.cn/mmbiz_png/bL2iaicTYdZn4O0Dr1HZI71GzWNX4iaLuS5KtibSnkFSSiaKcgO7CuYp6y2CTcm8vXABpMVQ4MWjqFZ3u8OnJpiaS4rw/640?wx_fmt=png&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/aWRXOSGECtZTtAswPVc6fKct85FoYsItibZ3pmIGSrIyT42WFyuaZpT7XyvQzdBU9KjOO6ibicPqRawLEfTMV1upw/640?wx_fmt=png&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">混凝土技术、</strong></p>
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<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;">18611970866</p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;"><span style="color: green;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/5kZwgePJyg0c4mzvib0m97KVB2Y4iaohar8Z8SJKq3rOb7grJ6gCHQ8bf20ZnlHfxGZDSwv20f3k7gm9Zm8pWxQA/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></span></span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">02</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">早强剂</strong></p><img src="https://mmbiz.qpic.cn/mmbiz_gif/bL2iaicTYdZn7XRxFdxic6iazSIGSWJU5KJmnafOeicXBOgxQO8TsIVmWhk3yQmbFlyPliav3V8wTicN2oK6GjRiarCpzw/640?wx_fmt=gif&wxfrom=5&wx_lazy=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/aWRXOSGECtZTtAswPVc6fKct85FoYsIt6RCr03t7DfehJoJKJnavb1icQ1cZ7nrrg5x6ETJRQFyzWCzq6jKibRAA/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/aWRXOSGECtZn823iaCJicsnFXxltrfCiaib8oM3wP2TsnFA96enZGicSnsqMKamPIeJjIJM3vXZTAhHibAdhX9rOI8bg/640?wx_fmt=png&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">早强剂也称作促凝剂,是指能提高混凝土早期强度,并且对后期强度无显著影响的外加剂。早强剂的主要作用在于加速水泥水化速度,促进混凝上早期强度的发展。混凝土早强剂是外加剂发展历史中最早使用的外加剂品种之一。这些种类的早强型外加剂都已经在实际工程中使用,在改善混凝土性能、提高施工效率和节约投资成本方面发挥了重要作用。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">03</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">缓凝剂</strong></p><img src="https://mmbiz.qpic.cn/mmbiz_gif/bL2iaicTYdZn7XRxFdxic6iazSIGSWJU5KJmnafOeicXBOgxQO8TsIVmWhk3yQmbFlyPliav3V8wTicN2oK6GjRiarCpzw/640?wx_fmt=gif&wxfrom=5&wx_lazy=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/aWRXOSGECtZTtAswPVc6fKct85FoYsItr8liaur9kBfL02iaVZYStlxgLKwJwwaSqzK9Wfaek6Eko8AhJOjhotmQ/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">混凝土缓凝剂,在商品混凝土中掺入缓凝剂的目是延缓混凝土的水合硬化作用,延长混凝土的凝结时间,使新拌混凝土能在较长时间内保持塑性;特别是抵消高温状态下的混凝土凝结速度,并且对混凝土后期强度没有明显影响。适用于高温条件下连续灌筑混凝土、大体积混凝土、预拌混凝土和泵送混凝土。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">04</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">膨胀剂</strong></p><img src="https://mmbiz.qpic.cn/mmbiz_gif/bL2iaicTYdZn7XRxFdxic6iazSIGSWJU5KJmnafOeicXBOgxQO8TsIVmWhk3yQmbFlyPliav3V8wTicN2oK6GjRiarCpzw/640?wx_fmt=gif&wxfrom=5&wx_lazy=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/5kZwgePJyg0c4mzvib0m97KVB2Y4iaohar41BohWibjOl1oJBzYGBAN6l5PwYyDtbosxldgM57U6ZEXjbBoibMgl9A/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">混凝土膨胀剂是一种新型混凝土外加剂,通过与混凝土中的水泥、水水反应来产生体积变大的结晶,当水泥凝结硬化时,随之体积膨胀,产生一定的预应力,起补偿收缩和张拉钢筋产生预应力以及充分填充水泥间隙的作用。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">05</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">引气减水剂</strong></p><img src="https://mmbiz.qpic.cn/mmbiz_gif/bL2iaicTYdZn7XRxFdxic6iazSIGSWJU5KJmnafOeicXBOgxQO8TsIVmWhk3yQmbFlyPliav3V8wTicN2oK6GjRiarCpzw/640?wx_fmt=gif&wxfrom=5&wx_lazy=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/aWRXOSGECtZTtAswPVc6fKct85FoYsItyYGQXol4NCsdCibzskwvb6X2Nu6xsyURVryEUXKMC3oqj0Jbd9AMe3w/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">引气剂是阴离子表面活性剂的一种形式,在实际应用中,由于其表面有活性剂而具有一定的活性。在混凝土拌合物中加入引气剂后,在搅拌过程中引入的空气微气泡能够均匀分布在混凝土内部结构中,并且这些微气泡能够长期处于相对稳定的状态时间。将引气剂溶解在水中,在这种情况下,无论是气态还是液态,都能被吸附,通过界面活性,起泡,稳泡,形成牢固的液膜。溶液表面的固有张力会逐渐降低。在此基础上,可以增加空气与液体的接触面积,吸附的引气剂分子可以进一步保证液膜的稳定性,保证气泡不会破裂。大量数据可以证实,引气剂掺量的逐渐增大,就使得混凝土的内部含气量逐渐提升。适宜用于港口、码头、水利工程、公路路面、抗冻融、防腐、防渗工程等要求有一定含气量的混凝土。</span></p><span style="color: green;">
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<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">06</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">速凝剂</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/aWRXOSGECtZTtAswPVc6fKct85FoYsItoA89ibf8sKghibJkph88hJmaehrlZsf8ibZoFnJWLmW54tTnCNYbW7SIQ/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">速凝剂作为喷射混凝土施工中需要的外加剂,能使水泥混凝土迅速凝结硬化的外加剂。能与水泥矿物作用生成稳定和难溶的化合物,加速凝聚结构生成。它们的作用是加速水泥的水化硬化,在很短的时间内形成足够的强度,以保证特殊施工的要求。这种添加剂一般应用在喷射混凝土施工当中。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">07</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><strong style="color: blue;">泵送剂</strong></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/aWRXOSGECtZTtAswPVc6fKct85FoYsItUvXhMmibO5Ak35GEYPRTQXwBic8nR1iaLEhQOfuOTOGDwaLnqVVH5ibVVw/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/aWRXOSGECtYnCicB6ibvyJ8g9LdVloXMhoMCMCjDeTGg7DNTgiaBHr72ILkV2f0qv5PClicH6POibsqqUZch1I2ZtfA/640?wx_fmt=png&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;">
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">混凝土泵送剂,是指能改善混凝土泵送性能的外加剂。所谓泵送性能,就是混凝土拌合物具有顺利通过输送管道、不阻塞、不离析、粘塑性良好的性能。泵送剂采用由减水剂、缓凝剂、引气剂、减阻剂等复合而成。泵送剂的性能具有高流通、粘聚、润滑、缓凝之功效,适合制作高强或流态型的混凝土。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">目前混凝土常用的是减水剂,普遍使用的减水剂是萘系减水剂及聚羧酸系减水剂。减水剂属于表面活性剂,混凝土在相同流动下可以减少用水量,提高混凝土强度和耐久性,如高清混凝土、高性能混凝土都离不开高效减水剂。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_jpg/aWRXOSGECtYROHicMFicw1JWViaC5BQuxDM7ILWobtcy4WzqiblPxKLMoZmxyYnpJUEHQsJOSNcFIibrssEaWZsnJyg/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/sz_mmbiz_png/aWRXOSGECtafaCXJtb4okjMuQdNAL6gCAS1VA4mlzibFvJMYkBeTo1TflyGiahIrVGt6sicTgws1DlibD9nKpBF54g/640?wx_fmt=png&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
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