【摘要】：隨著聚羧酸減水劑在實(shí)際工程的大量應(yīng)用，發(fā)現(xiàn)混凝土骨料中的泥會吸附聚羧酸減水劑，導(dǎo)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(qiáng)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(shí)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(dāng)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(qiáng)，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(dá)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(qiáng)度和吸附能力，且吸附強(qiáng)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(jī)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(jìn)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(jī)理，提出復(fù)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(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528.042.2

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