【摘 要】
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The objective of this paper is to examine the rheological properties of cement paste with lower water-binder ratio (W/B) of 0.25.The electrochemical technique is utilized to assess the evolution of th
【机 构】
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Department of Material science and technology, Henan polytechnic university, 454003, China
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The objective of this paper is to examine the rheological properties of cement paste with lower water-binder ratio (W/B) of 0.25.The electrochemical technique is utilized to assess the evolution of the rheological properties of fresh cement pastes with different amount of high range water reducing admixture (HRWR), as well as the mini cone method.The experimental results show that the high range water reducing admixtures can effectively influence the rheological properties of paste.The cement paste is controlled by dynamics or diffusion,depending on the structure of fresh mixtures influenced by HRWR.Meanwhile, the parameter Rct obtained by Nyquist curves measured by electrochemical impedance method varies as the dosage of HRWR increase from 0.5% to 1.4%, indicating that the HRWR indeed has obvious effect on the ability of paste transferring charge,further influence the rheological structure of fresh cement paste.Additionally, the parameter of Rct is closely related to the fluidity of fresh cement paste measured by mini cone.
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