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id="5jpvbhx" class="panel-sd"> <div id="dlnn95n" class="tit">聯(lián)系我們</div> <div id="95rxnpr" class="contact-sd"> <strong>重慶正茂環(huán)?？萍加邢薰?/strong><br> 手機：15923289911<br> 投訴：13996185400<br> 郵箱：1369768490@qq.com<br> 地址：重慶市-江津區 </div> </div> </div> <div id="pbbzjxx" class="ct2-mn"> <div id="tzjlpnl" class="sub-tit"><div id="vxxlbzp" class="curmbs"> <span>您的位置：</span> <a href="/">正茂首頁(yè)</a> / <a href="/News/" title="新聞資訊">新聞資訊</a> / <a href="/list/7/" title="行業(yè)資訊">行業(yè)資訊</a></div>行業(yè)資訊</div> <div id="td9fdn9" class="content-body"> <div id="nnhvlbz" class="content-title"> <h1>聚羧酸減水劑復配工藝優(yōu)化</h1> <p> <span>時(shí)間：2021-11-23 16:06:13</span> <span>人氣：464次</span> </p> </div> <div id="95rtxt9" class="ui-show-image"> </div> <div id="vbhnhdv" class="content-body"> <div id="9tdnx5f" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">機制砂是巖石經(jīng)除土開(kāi)采、機械破碎、篩分而成，石料破碎過(guò)程中產(chǎn)生的石屑廢料經(jīng)篩分、除粉處理也可用于生產(chǎn)機制砂。機制砂顆粒表面粗糙、尖銳多棱角，細度模數大，級配不良，堆積空隙率高，決定了配制出的混凝土需水量大、強度低、外觀(guān)質(zhì)量不好等一系列問(wèn)題，從而使用機制砂配制的混凝土和易性差，易于離析泌水，成型的構造物表觀(guān)質(zhì)量不好。關(guān)于機制砂混凝土的配制，目前基本沿襲天然砂混凝土配制方法，而忽視了機制砂與機制砂混凝土的特性，從而使工程技術(shù)人員難以掌握。聚羧酸類(lèi)減水劑是目前應用最廣泛的混凝土添加劑，具有減水率高、摻量低、保坍性能好等優(yōu)點(diǎn)，應用技術(shù)較為成熟。但是，由于機制砂本身的特性，導致了混凝土配制過(guò)程中出現了和易性差、易泌水離析等問(wèn)題。因此，本研究通過(guò)對聚羧酸減水劑的復配工藝的優(yōu)化，配置工作性能優(yōu)異的機制砂混凝土，并應用于實(shí)際工程項目中。</span></p></div><div id="5phrzfd" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 0pt;"><span style="max-width: 100%; color: rgb(0, 0, 255); font-weight: bold;">1原材料及試驗方法</span></p></div><div id="fbjj3pt" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%; color: rgb(255, 0, 0);">1.1原材料</span></p></div><div id="jpvx9rh" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（1）水泥（C）：海螺P·O42.5水泥，主要性能指標見(jiàn)表1所示。</span><span style="max-width: 100%;"></span></p><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p></div><div id="t9nr9fd" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="btprtd9" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics6.baidu.com/feed/8694a4c27d1ed21b02b455fe0ebc0bcc50da3f82.png?token=f998ede1173c8d6e5db019c924742b88" width="445" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="xzhljrh" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（2）粉煤灰（FA）：城隍Ⅱ級粉煤灰，主要性能指標見(jiàn)表2所示。</span><span style="max-width: 100%;"></span></p><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p></div><div id="zzxx99x" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="rrnf9dn" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics5.baidu.com/feed/a5c27d1ed21b0ef4d599233a7f1687d280cb3eb8.png?token=f7756461ac164a8ccd0d591809e13840" width="461" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="pfn9b9h" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（3）礦粉（SL）：日照S95級礦粉，主要性能指標見(jiàn)表3所示。</span><span style="max-width: 100%;"></span></p><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p></div><div id="j9vztdt" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="hrhrrtl" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics3.baidu.com/feed/48540923dd54564e96f0f7c5100c4a8ad3584f8b.png?token=b6beb1b3715c5a24db08b09a56176a30" width="468" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="xrrn9pf" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;"><br/> （4）河砂（S1）：細度模數為2.1，含泥量小于1%的河砂。</span></p></div><div id="zdfb9jl" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（5）機制砂（S2）：細度模數2.8。</span></p></div><div id="zpbt99d" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（6）石（G1）：采用公稱(chēng)粒徑5～10mm卵石。</span></p></div><div id="z9vz5ft" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（7）石（G2）：采用公稱(chēng)粒徑10~20mm碎石。</span></p></div><div id="zph9jl9" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（8）水（W）：自來(lái)水，符合《混凝土用水標準》JGJ63-2006中規定的拌合用水要求。</span></p></div><div id="htv5xxn" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（9）外加劑：MS-1、MS-2、MS-3:聚羧酸減水劑母液（含固量為50%）；BT-1、BT-2、BT-3:保坍劑母液（含固量為40%）；X1為消泡劑；Y1為引氣劑，H1為緩凝劑，均為福建科之杰新材料有限公司生產(chǎn)。</span></p></div><div id="prlfhbz" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%; color: rgb(255, 0, 0);">1.2試驗方法</span></p></div><div id="dvd9559" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（1）混凝土拌合物性能測定。按照GB/T50080-2016《普通混凝土拌合物性能試驗方法標準》要求進(jìn)行混凝土坍落度、擴展度、含氣量和凝結時(shí)間的測定；按照GB/T50081-20</span><span style="max-width: 100%;">19</span><span style="max-width: 100%;">《普通混凝土力學(xué)性能試驗方法標準》進(jìn)行混凝土抗壓強度的測定。</span></p></div><div id="9vpp5rx" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（2）混凝土配合比。見(jiàn)表4所示。</span><span style="max-width: 100%;"></span></p><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p></div><div id="3rj9vbp" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="x59t9lx" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics7.baidu.com/feed/b2de9c82d158ccbf4bd288edbd0a6a36b33541d1.png?token=e5b970032331efc083fa0eca67f9ca5d" width="477" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="blfzzhz" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 0pt;"><span style="max-width: 100%; color: rgb(0, 0, 255); font-weight: bold;"><br/>2結果與討論</span></p></div><div id="rjb3b5n" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%; color: rgb(255, 0, 0);">2.1聚羧酸母液對混凝土工作性能的影響</span></p></div><div id="35xxrxb" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">混凝土配合比見(jiàn)表4所示，減水劑復配配方見(jiàn)表5所示，對比研究3種聚羧酸減水劑母液MS-1、MS-2、MS-3對機制砂混凝土工作性的影響。減水劑摻量為1.5%</span><span style="max-width: 100%;">～</span><span style="max-width: 100%;">1.8%。試驗結果見(jiàn)表6所示。</span><span style="max-width: 100%;"></span></p></div><div id="99h9hxd" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="95vdxr9" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics7.baidu.com/feed/3801213fb80e7beca7c222608dfc6f309a506b76.png?token=5a22312831c1c392edba41ca8f8d2aac" width="482" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="tn9n9tz" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 40px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="jrxbpll" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics1.baidu.com/feed/b64543a98226cffccba938a71ad39c98f703ea04.png?token=b14d02b242dbff01423b1e48079e1b44" width="553" class="_3yZQZ9OxCCD0QVw16rnEsS" style="border: 0px; width: 599px; border-radius: 13px;"/></div></div><div id="x9zrfhn" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;"><br/>從表6的試驗結果可以看出，采用樣品1的初始減水率略大，但是保坍性能略差，和易性一般；而樣品2的減水率稍低，需要增加0.05%摻量，含氣量比較大，抗壓強度稍低；樣品3的減水率在3個(gè)樣品中均中，保坍性能較好，抗壓強度比較高，和易性好。說(shuō)明樣品3對機制砂混凝土比較適應。因此，可以選擇樣品3（MS-3）作為減水劑母液進(jìn)行復配，但是整體上損失還是偏大，可以提高保坍劑摻量或者更換其他保坍劑。</span></p></div><div id="39vn3vt" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%; color: rgb(255, 0, 0);">2.2保坍劑對混凝土工作性能的影響</span></p></div><div id="vpr9hln" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">改變保坍劑種類(lèi)，保持聚羧酸減水劑母液MS-3和其他助劑不變，對比不同種類(lèi)的保坍劑對混凝土性能的影響。減水劑復配配方見(jiàn)表7，混凝土配合比見(jiàn)表4所示，試驗結果見(jiàn)表8。</span></p></div><div id="x9ttpfh" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="xpx99hf" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics4.baidu.com/feed/0ff41bd5ad6eddc4b31bf48b930960f553663319.png?token=129e063530c0cb7becafbc43e64b0fa5" width="461" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="xt9vvdd" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 40px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="ftphrbv" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics1.baidu.com/feed/b812c8fcc3cec3fdc1ce841f745a0237859427c6.png?token=42519824dca565d4b44e2fad450068fe" width="553" class="_3yZQZ9OxCCD0QVw16rnEsS" style="border: 0px; width: 599px; border-radius: 13px;"/></div></div><div id="ptxtdft" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;"><br/>從表8的試驗結果可以看出，3個(gè)樣品的減水率相當，其中樣品6的保坍性能最好，其次是樣品4，樣品5最差；樣品6混凝土抗壓強度稍高，樣品4和樣品5相當；和易性3個(gè)樣品相當，均較好。因此，減水劑母液選擇MS-3，保坍劑選擇BT-3對機制砂混凝土較適應，初始和保坍性能較好。</span></p></div><div id="vhhlnvx" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%; color: rgb(255, 0, 0);">2.3聚羧酸減水劑在機制砂混凝土工程中的應用</span></p></div><div id="hxvrr9x" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（1）混凝土主要技術(shù)指標要求?？紤]到工程的結構、混凝土溫差以及施工條件，其混凝土的技術(shù)要求主要包括以下幾個(gè)方面：①坍落度≥200mm，擴展度≥550mm。②2h擴展度經(jīng)時(shí)損失≤30mm。③混凝土流動(dòng)度好、不泌水、不抓底。④含氣量控制在4.0%以?xún)?。⑤無(wú)緩凝現象，終凝時(shí)間≤24h。</span></p></div><div id="dppppv3" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（2）工程技術(shù)難點(diǎn)。根據工程施工技術(shù)的要求以及所選用原材料的特點(diǎn)，其技術(shù)難點(diǎn)主要包括兩個(gè)方面：①擴展度經(jīng)時(shí)損失。由于工程采用的砂子是由機制砂與細砂復合而成，所以增加了對外加劑的吸附作用，從而增加對混凝土保坍性能的要求。②無(wú)緩凝現象。在保證2h擴展度經(jīng)時(shí)損失≤30mm的前提下無(wú)緩凝現象，這也是該工程的技術(shù)難點(diǎn)之一。因此，不能通過(guò)增加緩凝劑來(lái)提高保坍性能，只能通過(guò)外加劑母液本身的保坍性能來(lái)解決坍落度損失的問(wèn)題。</span></p></div><div id="jrhvvxh" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（3）解決方案。①選用綜合性能較好的聚羧酸減水劑母液MS-3和保坍性能較好的保坍劑BT-3來(lái)解決和易性和坍落度損失的問(wèn)題。②同時(shí)搭配助劑X1、Y1和H1，控制混凝土含氣量和和易性，并保證混凝土的抗壓強度達到要求。詳見(jiàn)表9復配配方和表10試驗結果。</span><span style="max-width: 100%;"></span></p><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p></div><div id="zj35tfd" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 36px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="xbbfv9v" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics2.baidu.com/feed/42a98226cffc1e17249c6da7e342200b728de965.png?token=6c41cb986d9c791e3b8179265c507ef2" width="467" class="WGim2_x9QY_MDLSyZ5g3O" style="border: 0px; margin: 0px auto; border-radius: 13px;"/></div></div><div id="3tbzxv9" class="_4TUZRg-Yz-JYH2P3V5fsh " style="max-width: 100%; overflow-x: visible; display: flex; margin-top: 40px; font-family: arial; font-size: 12px; white-space: normal; background-color: rgb(255, 255, 255);"><div id="h95lfv5" class="_1Dg_4ksYttUK-gyQE1RGR6" style="display: flex; -webkit-box-orient: vertical; -webkit-box-direction: normal; flex-direction: column; -webkit-box-align: center; align-items: center; width: 599px;"><img src="https://pics7.baidu.com/feed/472309f7905298226f9fae6c7e18adc30846d4c8.png?token=4b7828b1df9809e62099f34ab8a0a099" width="553" class="_3yZQZ9OxCCD0QVw16rnEsS" style="border: 0px; width: 599px; border-radius: 13px;"/></div></div><div id="bbt9xzp" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 36px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-bottom: 0px; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px;"><br/></p><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">從表10的混凝土試驗結果可以看出，混凝土的初始坍落度和擴展度為220mm和560mm，符合工程的技術(shù)要求，180min的坍落度和擴展度為220mm和540mm，同時(shí)含氣量為3.8%，和易性好，符合工程的各項技術(shù)要求。</span></p></div><div id="fd5blnd" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 0pt;"><span style="max-width: 100%; color: rgb(0, 0, 255); font-weight: bold;">3結論</span></p></div><div id="v9frff9" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">通過(guò)以上試驗結果分析，可以得出：</span></p></div><div id="nxhpbrr" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（1）MS-3對機制砂混凝土的適應性較好，初始減水率高，坍落度損失小。</span></p></div><div id="fzrhh9z" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（2）BT-3對機制砂混凝土較適應，保坍性能較好，抗壓強度高。</span></p></div><div id="hvbnj59" class="_1T4GB1ESohOqTGNmwCAcuf " style="max-width: 100%; overflow-x: visible; line-height: 24px; color: rgb(51, 51, 51); margin-top: 22px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="margin-top: 0pt; margin-bottom: 0pt; margin-left: 0pt; padding: 0px; overflow-y: auto; max-width: 100%; line-height: 24px; text-align: justify; text-indent: 28pt;"><span style="max-width: 100%;">（3）將與機制砂混凝土體系適應性較好的聚羧酸減水劑母液MS-3與保坍劑BT-3以及適當的消泡劑X1、引氣劑Y1和緩凝劑H1復配，可有效減少機制砂混凝土的擴展度損失，并在工程上獲得成功應用。</span></p></div> </div> <div id="rjpptfn" class="ui-show-tags"> </div> <ul class="content-exp"> <li>上一篇： <a href="/News/284.html" title="聚羧酸減水劑的減水率檢測標準適應性探討">聚羧酸減水劑的減水率檢測標準適應性探討</a> </li> <li>下一篇： <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> </ul> </div> </div> </div> </div> </div> <div id="znfz3lf" 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