【摘要】：隨著聚羧酸減水劑在實際工程的大量應用，發(fā)現(xiàn)混凝土骨料中的泥會吸附聚羧酸減水劑，導致混凝土工作性能變差，主要表現(xiàn)為混凝土流動性下降、坍落度損失過快、強度和耐久性降低。 本研究主要選取蒙脫土、伊利土和高嶺土三種粘土礦物，通過實驗分析粘土礦物對聚羧酸減水劑性能的影響，研究表明蒙脫土對聚羧酸減水劑分散性影響最大，當粘土摻量大于4%時，1h后的凈漿流動度為0；蒙脫土對聚羧酸減水劑吸附最強，其吸附量是水泥顆粒的2.5倍，高嶺土對聚羧酸減水劑吸附最弱；粘土礦物對聚羧酸減水劑的吸附量隨聚羧酸減水劑的濃度增加而增加，最后達到飽和吸附量；通過Langmuir等溫吸附模型計算出蒙脫土對聚羧酸減水劑的飽和吸附量為12.76mg/g，伊利土的飽和吸附量為11.11mg/g，高嶺土的飽和吸附量為7.69mg/g；Freundlich吸附模型計算粘土對聚羧酸減水劑的吸附強度和吸附能力，且吸附強度隨著溫度的升高而降低，但是吸附能力隨著溫度的升高逐漸增大；Lagergren吸附模型計算各類粘土礦物對聚羧酸減水劑的吸附速率，隨著溫度的升高吸附速率降低，，說明升溫不利于粘土聚羧酸減水劑的吸附。 從靜電作用和金屬陽離子與聚羧酸減水劑的螯合作用出發(fā)，研究粘土對聚羧酸減水劑的吸附機理；利用紅外光譜和XRD等微觀測試手段，研究粘土對聚羧酸減水劑的吸附形式，研究表明被吸附的聚羧酸減水劑分子進入到了粘土結(jié)構(gòu)內(nèi)部；針對武漢地區(qū)粘土，利用粘土對聚羧酸減水劑的吸附機理，提出復配抗泥劑改善漿體流動性的措施。
[Abstract]:With the application of polycarboxylic acid water reducing agent in practical engineering , it is found that the mud in concrete aggregate can adsorb polycarboxylic acid water reducing agent , which results in poor concrete working performance , which is mainly characterized by the decrease of concrete fluidity , excessive slump loss , strength and durability .

The effect of clay mineral on the performance of polycarboxylic acid water reducing agent was studied by experiments . The results showed that montmorillonite had the greatest influence on the dispersibility of polycarboxylic acid water reducing agent . When the content of clay was more than 4 % , the net slurry fluidity after 1h was 0 ;
The adsorption capacity of montmorillonite to polycarboxylic acid water reducing agent is the strongest , the adsorption capacity of montmorillonite is 2.5 times that of cement particles , and the adsorption of kaolin to polycarboxylic acid water reducing agent is the weakest ;
the adsorption capacity of the clay mineral to the polycarboxylic acid water reducing agent increases with the concentration of the polycarboxylic acid water reducing agent , and finally reaches the saturated adsorption capacity ;
The saturated adsorption capacity of montmorillonite to polycarboxylic acid water reducing agent was 12.76mg / g and 11.11mg / g , 7.69 mg / g and 7.69 mg / g , respectively .
The Freundlich adsorption model calculates the adsorption strength and adsorption capacity of the clay to the polycarboxylic acid water reducing agent , and the adsorption strength decreases with the increase of the temperature , but the adsorption capacity gradually increases as the temperature increases ;
The adsorption rate of various clay minerals on polycarboxylic acid water reducing agent was calculated by Lagergren ' s adsorption model , and the adsorption rate was decreased with increasing temperature .

The adsorption mechanism of clay to polycarboxylic acid water reducing agent was studied from electrostatic interaction and chelating effect of metal cation and polycarboxylic acid water reducing agent .
The adsorption form of clay to polycarboxylic acid water reducing agent was studied by means of infrared spectrum and XRD . The results showed that the adsorbed polycarboxylic acid water reducing agent molecules entered into the clay structure ;
In view of the clay in Wuhan area , the adsorption mechanism of polycarboxylic acid water reducing agent was studied by using clay , and the measures to improve the fluidity of slurry body were put forward .
【學位授予單位】：武漢科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528.042.2

【參考文獻】

相關(guān)期刊論文 前10條

1 房滿滿;西曉林;林東;殷素紅;文梓蕓;;聚羧酸系高效減水劑的研究現(xiàn)狀和應用前景[J];材料導報;2008年03期

2 鄭大鋒;邱學青;樓宏銘;;減水劑在水泥與粉煤灰表面的吸附行為研究[J];材料科學與工藝;2009年05期

3 顧雄飛,鄭洪漢,韓家懋;關(guān)于粘土礦物學的某些問題[J];地質(zhì)地球化學;1980年03期

4 李有光;李苑;萬煜;鄧成;王智;錢覺時;;泥對摻聚羧酸減水劑的水泥漿體分散性的影響[J];重慶大學學報;2012年01期

5 王應;王智;胡倩文;李苑;劉川;;集料中黏土質(zhì)泥及其對混凝土性能的影響[J];硅酸鹽通報;2012年03期

6 胡曉波,陳志源;高效減水劑在水泥顆粒表面的吸附[J];硅酸鹽學報;2003年08期

7 王智;江楠;王應;萬煜;賈興文;;硫酸鹽對聚羧酸減水劑吸附量及吸附動力學的影響[J];硅酸鹽學報;2012年11期

8 馬保國;楊虎;譚洪波;代柱端;;水泥和黏土礦物對不同減水劑的吸附特性[J];硅酸鹽學報;2013年03期

9 王智;胡倩文;王應;王林龍;張磊;;蒙脫石對聚羧酸減水劑的層間吸附特性[J];硅酸鹽學報;2013年08期

10 巨浩波;呂生華;劉晶晶;;砂石質(zhì)量對混凝土性能影響的研究進展[J];硅酸鹽通報;2013年12期

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