本文選題：道路工程 + 氯氧鎂水泥　； 參考：《長安大學學報(自然科學版)》2017年03期

【摘要】：針對氯氧鎂水泥早強快硬特性導致其制備的混凝土存在長距離運輸時不易攪拌、難泵送等施工受限問題。通過旋轉黏度試驗測定了氯氧鎂水泥漿體在不同剪切速率下的剪切應力及塑性黏度值,采用冪律(Power-law)流體模型擬合氯氧鎂水泥流變曲線,并通過該模型分析氯氧鎂水泥材料組成設計參數MgO、MgCl_2、H_2O的物質的量比對氯氧鎂水泥漿體的剪切應力、塑性黏度及流變特性的影響。研究結果表明:Power-law模型適用于氯氧鎂水泥漿體流變曲線擬合,其擬合判定系數均大于0.9,擬合度高,并且可以對稠度系數、流變指數等流變參數進行較好的描述;氯氧鎂水泥漿體的剪切應力隨剪切速率的增大而增大,而塑性黏度隨剪切速率的增大先迅速降低后趨于平穩(wěn);剪切速率相同時,氯氧鎂水泥漿體的剪切應力隨MgO與MgCl_2物質的量比增大而增大,隨H_2O與MgCl_2物質的量比增大而減小;隨著水泥水化的進行,漿體剪切應力和塑性黏度均增大,當MgO、MgCl_2與H_2O的物質的量比為7∶1∶15時漿體最穩(wěn)定。
[Abstract]:In view of the early strength and fast hardening characteristics of magnesium oxychloride cement, the concrete prepared by magnesium oxychloride is difficult to mix and pump in long distance transportation. The shear stress and plastic viscosity of magnesium oxychloride cement at different shear rates were measured by rotating viscosity test. The rheological curves of magnesium oxychloride cement were fitted by Power-law fluid model. The influence of the quantity ratio of MgO _ 2 MgCl _ 2 / H _ 2O on the shear stress, plastic viscosity and rheological properties of magnesium oxychloride cement paste was analyzed by the model. The results show that the w / Power-law model is suitable for fitting rheological curve of magnesium oxychloride cement paste, and its fitting judgment coefficient is greater than 0.9, and the fitting degree is high, and the rheological parameters such as consistency coefficient and rheological index can be well described. The shear stress of magnesium oxychloride cement paste increases with the increase of shear rate, while the plastic viscosity decreases rapidly with the increase of shear rate and then tends to steady. The shear stress of magnesium oxychloride cement paste increases with the increase of the ratio of MgO to MgCl _ 2, decreases with the increase of the ratio of H _ 2O and MgCl _ 2, and increases with the hydration of cement. When the ratio of MgO / MgCl _ 2 to H _ 2O is 7:1:15, the slurry is the most stable.
【作者單位】： 長安大學材料科學與工程學院;青海省交通科學研究院;
【基金】：國家自然科學基金項目(51308062) 青海省重大科技專項項目(2014-GX-A2A) 中央高校基本科研業(yè)務費專項資金項目(310831163501,310831172201)
【分類號】：U414
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本文編號：2069777