Study on the rheological properties of fresh cement asphalt paste
Study on the rheological properties of fresh cement asphalt paste
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新拌水泥沥青净浆流变性能研究
DOI：
10.1016/j.conbuildmat.2011.07.010
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发表时间：
2012-02-01
影响因子：
7.4
通讯作者：
Han, Song
中科院分区：
文献类型：
--
作者：
Zhang, Yanrong;Kong, Xiangming;Han, Song
研究了新鲜水泥沥青浆体（CA浆体）的流变性能，讨论了沥青乳液类型、温度和时间等影响因素。在0℃、20℃和40℃下制备了含有两种沥青乳液且沥青含量不同的CA浆体。测试了初始屈服应力及其在储存期间的变化，以表征浆体的流变性能。进行了水化过程中的半绝热温度变化测量和光学显微镜观察，以确定浆体的水化动力学和微观结构演变。结果表明，由于沥青乳液的塑化作用及其对水泥水化的缓凝作用，浆体的初始流动性和在储存期间的流动性保持能力明显提高。阴离子沥青乳液比阳离子沥青乳液更有效，因为前者在水泥颗粒表面表现出良好的吸附性。CA浆体流变性能的温度敏感性取决于沥青乳液的类型和含量。将时间和温度对流变行为的影响整合到水泥水化程度的影响中。建立了一个将屈服应力与相对水化程度α′相关联的通用模型。实验结果表明，对于所有测试的CA浆体，屈服应力大致以线性方式随1/(1 - α′)增加。（C）2011爱思唯尔有限公司。保留所有权利。
The rheological properties of fresh cement asphalt paste (CA paste) were investigated, in which influencing factors such as type of asphalt emulsion, temperature, and time were discussed. CA pastes with two types of asphalt emulsions and varied asphalt contents were prepared at 0, 20 and 40 degrees C. The initial yield stress and its development over shelf time were tested to characterize the rheological properties of the,pastes. The measurement of semi-adiabatic temperature development during hydration and optical microscopic observation were carried out to determine the hydration kinetics and microstructure evolution of the pastes. Results indicate that the initial flowability and flowability retention over shelf time of the pastes visibly improve because of the plasticizing effect of the asphalt emulsion and its retardation effect on cement hydration. The anionic asphalt emulsion is more effective than the cationic type because the former exhibits favorable adsorption onto the surface of cement grains. The temperature sensitivity of the rheological properties of the CA paste depends on the type and content of asphalt emulsion. The effects of time and temperature on rheological behavior were integrated into the effect of cement hydration degree. A generalized model linking yield stress and relative hydration degree alpha' was established. Experimental results show that yield stress increases in a roughly linear fashion with 1/(1-alpha') for all tested CA pastes. (C) 2011 Elsevier Ltd. All rights reserved.