Rheological properties of concentrated aqueous injectable calcium phosphate cement slurry
Rheological properties of concentrated aqueous injectable calcium phosphate cement slurry
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DOI：
10.1016/j.biomaterials.2006.05.043
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发表时间：
2006-10-01
期刊：
影响因子：
14
通讯作者：
Zheng, Haiyan
中科院分区：
文献类型：
--
作者：
Liu, Changsheng;Shao, Huifang;Zheng, Haiyan
研究了浓缩型水基可注射磷酸钙水泥(CPC)浆体的稳态和动态流变性。结果表明，浓缩型水基可注射CPC具有可塑性和触变性两种行为。随着凝结过程的进行，CPC浆体的屈服应力增大，触变滞后环面积增大，说明浆体的网状结构强度有所提高。动态流变性研究结果表明，该浆体在凝结过程中表现出对CPC浆体流变性的影响，反映了该浓悬浮液的流动性(或注入性)和微观结构的发展。提高粉液比减小了颗粒间的距离，提高了初始强度，缩短了凝结时间。此外，升高温度提高了材料的初始强度，提高了反应级数，缩短了固化时间，有利于固化过程。原料的颗粒大小与原始结构的强度和凝结时间有很大关系。CPC水泥浆在凝结过程中的储存模数G‘符合幂函数G’=A exp(BT)规律，可用于预测凝结时间，计算结果与实验数据吻合较好。(C)2006爱思唯尔有限公司。保留所有权利。
In this paper, the steady and dynamic rheological properties of concentrated aqueous injectable calcium phosphate cement (CPC) slurry were investigated. The results indicate that the concentrated aqueous injectable CPC showed both plastic and thixotropic behavior. As the setting process progressed, the yield stress of CPC slurry was raised, the area of the thixotropic hysteresis loop was enlarged, indicating that the strength of the net structure of the slurry had increased. The results of dynamic rheological behavior indicate that the slurry presented the on the rheological properties of the CPC slurry in the setting process, a reflection of the flowing properties (or injection), and the microstructure development of this concentrated suspension. Raising the powder-to-liquid ratio decreased the distance among the particles, increased the initial strength, and shortened the setting time. In addition, raising the temperature improved the initial strength, increased the order of reaction, and shortened the setting time, which was favorable to the setting process. The particle size of the raw material had much to do with the strength of original structure and setting time. The storage module G' of CPC slurry during the setting process followed the rule of power law function G' = A exp(Bt), which could be applied to forecast the setting time, and the calculated results thereafter are in agreement with the experimental data. (c) 2006 Elsevier Ltd. All rights reserved.