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A、C 速凝劑則為實(shí)驗室中分別按母液、水、硫酸鋁( 工業(yè)級 Al2 SO4 ·18H2O) 比例 25: 25: 50 和 35: 25: 40 配制所得，配制過(guò)程中先將母液和水混合，再加入硫酸鋁攪拌至均勻，計算得其含固量分別為 41% 和 42% 。樣品編號以“水泥編號－速凝劑編號”表示，例如 HL － A; 未摻速凝劑樣品則以“水泥編號－ 0”表示。</span> </p> <p class="p4" style="text-align:center;"> <img src="/temp/1632386432993.png" /> </p> <p class="p4"> <span>1． 2 實(shí)驗方法</span> </p> <p class="p4"> <span>實(shí)驗中無(wú)堿液體速凝劑性能的測定參考 JC 477 － 2005《噴射混凝土用速凝劑》進(jìn)行，但改變標準實(shí)驗中的攪拌制度，采用機械或人工方式攪拌不同時(shí)間進(jìn)行實(shí)驗。機械攪拌時(shí)，加入速凝劑后即開(kāi)始計時(shí)，使用凈漿或砂漿攪拌機，先慢速攪拌 5s 再快速攪拌相應時(shí)間，以“慢 5s + 快 40s”為例，表示采用機械方式先慢攪 5s 后快攪 40s; 人工攪拌時(shí)，加入速凝劑后即開(kāi)始計時(shí)，人工用鏟刀在鍋內翻拌相應時(shí)間，以“人工 15s”為例，表示采用人工方式攪拌 15s。實(shí)驗中，凈漿凝結時(shí)間、砂漿抗壓強度的測定分別選取了 6 種不同攪拌制度。 2 結果與討論</span> </p> <p class="p4"> <span>2． 1 水泥、速凝劑種類(lèi)</span> </p> <p class="p4"> <span>實(shí)驗先用海螺水泥 HL、乃托水泥 NT 和基準水泥 JZ，分別摻入成品、A 和 C 速凝劑，研究攪拌制度在不同水泥、速凝劑體系中對凈漿凝結時(shí)間和砂漿抗壓強度檢測的影響，結果如表 2 和表 3 所示，速凝劑摻量固定為 6% ，表 2 括號中凝結時(shí)間為試針初次達到測試終點(diǎn)后立即換取兩位置再進(jìn)行試驗，試針第三次達到測試終點(diǎn)的時(shí)間，兩個(gè)凝結時(shí)間差值可反映速凝劑攪拌的均勻性。</span> </p> <p class="p4"> <br /> </p> <p class="p4" style="text-align:center;"> <img src="/temp/1632386433005.png" /> </p> <p class="p4"> <br /> </p> <p class="p4"> <span>由表 2 可知，相同條件下，NT 的凝結時(shí)間相對較短，JZ次之，而 HL 凝結時(shí)間最長(cháng)。水泥相同時(shí)，摻 A 速凝劑的凈漿凝結時(shí)間最佳，成品速凝劑次之，C 速凝劑最差。在不同水泥、速凝劑體系中，采用不同的攪拌制度測出的凝結時(shí)間也不同，“機械慢 5s + 快 5s”制度下凈漿的初凝、終凝時(shí)間均較“人工 15s”制度下要短。當凝結時(shí)間較短時(shí)，試驗過(guò)程中速凝劑反應較快導致漿體裝模較難，不易填充密實(shí)，括號內外凝結時(shí)間的差值也相對較大，說(shuō)明此條件下速凝劑攪拌的均勻性較差。</span> </p> <p class="p4" style="text-align:center;"> <img src="/temp/1632386433016.png" /> </p> <p class="p4"> <br /> </p> <p class="p4"> <span>由表 3 可知，相同條件下，NT 膠砂 1d 強度較高，超過(guò)了 12. 0MPa，JZ 次之，而 HL 膠砂 1d 強度最低，不到空白砂漿 HL － 0 強度的一半; 三種水泥空白膠砂 28d 強度相差不大，而摻 HL 速凝劑后強度最高，各攪拌制度下 28d抗壓強度比均超過(guò)了 110% 。JZ 體系中，摻 A 速凝劑砂漿的1d、28d 強度均較高，成品次之，C 速凝劑最差，尤其 1d 抗壓強度僅為 2. 0MPa，低于 JC 477 － 2005 中合格品速凝劑的強度要求。在不同水泥和速凝劑體系中，采用不同攪拌制度時(shí)，強度也不相同，“機械慢 5s + 快 40s”較“人工 40s”制度下，1d 強度較高，而 28d 強度略低。因此，在不同水泥和不同速凝劑體系中，攪拌方式及攪拌時(shí)間對速凝劑性能檢測結果均有影響。</span> </p> <p class="p4"> <br /> </p> <p class="p4"> <br /> </p> <p class="p4"> <span>2． 2 速凝劑摻量</span> </p> <p class="p4"> <span>由于攪拌制度在不同水泥、速凝劑體系中對凈漿凝結時(shí)間和砂漿抗壓強度的檢測結果均有影響，因此本節選取海螺水泥 HL 和 A 速凝劑，采用多種攪拌制度進(jìn)行試驗，在速凝劑不同摻量下，研究攪拌制度對檢測結果的影響，以選出最佳的攪拌制度，實(shí)驗結果如表 4 和表 5 所示，實(shí)驗中速凝劑的摻量為 5% ～ 8% ，凈漿凝結時(shí)間、砂漿抗壓強度檢測試驗中分別選用了 6 種不同攪拌制度。</span> </p> <p class="p4" style="text-align:center;"> <img src="/temp/1632386433028.png" /> </p> <p class="p4"> <br /> </p> <p class="p4"> <span>由表 4 可知，相同條件下，速凝劑摻量不同，凈漿凝結時(shí)間也不相同，摻量越高，初凝、終凝時(shí)間越短; 且在各摻量下，無(wú)論是機械攪拌還是人工攪拌，初凝、終凝時(shí)間在速凝劑不同摻量下均隨著(zhù)攪拌時(shí)間的延長(cháng)而增加?！叭斯?15s” 與“慢 5s + 快 5s”制度下實(shí)驗結果相近，“人工 25s”制度下實(shí)驗結果則介于“慢 5s + 快 10s”和“慢 5s + 快 15s”之間。當速凝劑摻量較高、攪拌時(shí)間較短時(shí)，試驗過(guò)程中速凝劑反應較快，導致漿體裝模較難，不易填充密實(shí)，試樣底面多孔洞，括號內外兩凝結時(shí)間的差值也相對較大，終凝時(shí)間尤為明顯，說(shuō)明速凝劑摻量越高、攪拌時(shí)間越短時(shí)，速凝劑速凝效果越好，但速凝劑攪拌的均勻性相對越差。如摻量 8%時(shí)，“慢 5s + 快 5s”制度下，初凝、終凝括號內外兩時(shí)間差值均為 6s，成型裝模較困難; 延長(cháng)攪拌時(shí)間，兩個(gè)差值均逐漸減小，“慢 5s + 快 20s”時(shí)，分別減小為 3s 和 4s，成型裝模較容易，延長(cháng)人工攪拌時(shí)間規律也是如此。而當攪拌超過(guò)一定時(shí)間后，凈漿凝結時(shí)間會(huì )明顯增加，終凝時(shí)間尤為顯著(zhù)，例如摻量 8% ，機械快攪時(shí)間從 15s 增加至 20s 時(shí)，初凝、終凝時(shí)間均明顯增加，終凝時(shí)間從 7min50s 延長(cháng)至 30min10s，說(shuō)明攪拌超過(guò)一定時(shí)間會(huì )破壞速凝劑摻入漿體后反應形成的網(wǎng)狀結構，導致速凝效果變差，且速凝劑摻量越低，其網(wǎng)狀結構越容易被破壞。因此，檢測摻速凝劑凈漿凝結時(shí)間時(shí)，最佳的攪拌制度，應在保證速凝劑攪拌均勻的條件下，選用較短的攪拌時(shí)間，以免速凝劑反應形成的網(wǎng)狀結構被破壞。對摻 A 速凝劑凈漿凝結時(shí)間的檢測應在 8% 摻量下采用“慢 5s + 快 15s”的攪拌制度。</span> </p> <p class="p5" style="text-align:center;"> <img src="/temp/1632386433064.png" /> </p> <p class="p5"> <br /> </p> <p class="p5"> <span>由表 5 可知，速凝劑不同摻量條件下，采用機械方式攪拌，快速攪拌時(shí)間從 15s 增加至 50s 時(shí)，砂漿 1d 抗壓抗壓強度變化較大，28d 抗壓強度或 28d 抗壓強度比則相差較小，但 1d、28d 抗壓強度總體均為先升高后降低，強度存在最優(yōu)值，但 1d 與 28d 抗壓強度最優(yōu)值的對應性較差。如摻量8% 時(shí)，砂漿 1d 抗壓強度在“慢 5s + 快 40s”制度下達到最高值 9. 5MPa，而 28d 抗壓強度在“慢 5s + 快 20s”制度下達到最高值 53. 6MPa、抗壓強度比達最高 121. 0% 。JC 477 －2005 標準中，成型砂漿采用人工方式攪拌 40 ～ 50s，即為本實(shí)驗中“人工 40s”攪拌制度，比較發(fā)現，“人工 40s”制度下1d、28d 抗壓強度均低于機械攪拌下的強度最優(yōu)值，1d 抗壓強度尤為明顯。相同條件下，速凝劑摻量越高、攪拌時(shí)間越短，砂漿成型越困難，如摻量 8% 時(shí)，“慢 5s + 快 15s”機械攪拌制度下，攪拌過(guò)程中拌合物劇烈放熱并快速凝結，成型時(shí)砂漿較難振實(shí)，脫模后可見(jiàn)試件表面有較多孔洞; 當降低速凝劑摻量或延長(cháng)攪拌時(shí)間時(shí)，砂漿拌合物會(huì )越來(lái)越稀，成型較容易。同時(shí)隨速凝劑摻量的降低，砂漿 1d 抗壓強度的最優(yōu)值逐漸降低，當摻量降至 5% 時(shí)，強度已低于 6. 0MPa，低于 JC 477 － 2005 中合格品速凝劑的強度要求，而 28d 強度或 28d 抗壓強度比的最優(yōu)值變化較小。因此，在速凝劑不同摻量下，攪拌制度對摻速凝劑砂漿強度檢測結果有一定影響，但對砂漿 1d、28d 強度檢影響大小不一，最佳的攪拌制度，應在保證速凝劑攪拌均勻的條件下，綜合考慮砂漿 1d 和28d 的強度，對于摻 A 速凝劑砂漿強度的檢測應在 8% 摻量下采用“慢 5s + 快 30s”的攪拌制度。</span> </p> <p class="p5"> <br /> </p> <p class="p5"> <span>3 結語(yǔ)</span> </p> <p class="p5"> <span>(1) 攪拌制度( 包括攪拌方式及攪拌時(shí)間) 在不同水泥、速凝劑體系中，對摻速凝劑的凈漿凝結時(shí)間和砂漿抗壓強度的檢測結果均有影響。 </span> </p> <p class="p5"> <span>(2) 速凝劑不同摻量條件下，無(wú)論是機械攪拌還是人工攪拌，摻速凝劑凈漿初凝、終凝時(shí)間均隨著(zhù)攪拌時(shí)間的延長(cháng)而增加，且“人工 15s”與“慢 5s + 快 5s”制度下結果相近;而機械方式攪拌時(shí)，快攪時(shí)間從 15s 增加至 50s 時(shí)，砂漿 1d、28d 抗壓強度總體均為先升高后降低，均存在最優(yōu)值，但 1d與 28d 強度最優(yōu)值的對應性較差，且隨攪拌時(shí)間變化，1d 強度變化較大，28d 強度變化較小。 </span> </p> <p class="p5"> <span>(3) 對摻速凝劑凈漿凝結時(shí)間的檢測，最佳的攪拌制度，應在保證速凝劑攪拌均勻的條件下，選用較短的攪拌時(shí)間，以免破壞速凝劑反應產(chǎn)生的網(wǎng)狀結構; 對摻速凝劑砂漿強度的檢測，最佳的攪拌制度，應在保證速凝劑攪拌均勻的條件下，同時(shí)考慮砂漿 1d 和 28d 的強度。對 A 速凝劑性能的檢測，應在 8% 摻量下，凈漿凝結時(shí)間的檢測采用“慢 5s +快 15s”的攪拌制度，砂漿強度的檢測采用“慢 5s + 快 30s”的攪拌制度。</span> </p> <p class="p4"> <br /> </p> <style type="text/css">.b1{white-space-collapsing:preserve;} .b2{margin: 1.0in 1.25in 1.0in 1.25in;} .p1{text-align:center;hyphenate:auto;font-family:宋體;font-size:18pt;} .p2{text-align:center;hyphenate:auto;font-family:宋體;font-size:10pt;} .p3{text-indent:0.3888889in;text-align:justify;hyphenate:auto;font-family:宋體;font-size:14pt;} .p4{text-align:justify;hyphenate:auto;font-family:宋體;font-size:14pt;} .p5{text-align:start;hyphenate:auto;font-family:宋體;font-size:14pt;} </style> </div> </div> <div id="p9jhdz5" class="h10"></div> <div id="l5txlfz" class="articlePage wow fadeInUp"> </div>  </div> <div id="jhdvrld" class="fotA"> <div id="t55hzvr" class="pageUpbtn fl"> <i class="artbtn1"></i><a style="padding-left: 90px;" href="/view/cnIndex/1/91/view/335.html"> 高性能混凝土中外加劑的摻加方式與適應性</a> </div> <div id="95f5rrn" class="pageUpbtn"> <i class="artbtn2"></i><a href="/view/cnIndex/1/91/view/330.html"> 液體無(wú)堿速凝劑中幾種常用組分的作用</a> </div> </div> </div> </div> <div id="bbtf5nh" class="h40"></div> <div id="vtxrbt5" class="footer"> <div id="bddvldb" class="wrap"> <div id="xbrnjfx" class="footerL"> <div id="vtrldx5" class="footerLUp"> <div id="95pljhd" class="footLogo"> <a href="#"> <img src="/uploadDir/png/20190415/1555328037783.png"/> </a> </div> <dl class="footerIcn"> <dd class="iconBox"> <a target="_blank" ></a> </dd> <dd class="iconBox"> <div id="vdzrnjd" class="bdsharebuttonbox"> <a href="#" class="bds_weixin" data-cmd="weixin" title="分享到微信"></a> </div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; 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