Journal
CEMENT AND CONCRETE RESEARCH
Volume 99, Issue -, Pages 183-189Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.05.014
Keywords
Cement; Small amplitude oscillatory shear; Static yield stress; Structural build-up; Thixotropy
Funding
- National Natural Science Foundation of China [51208515]
- Center for Infrastructure Engineering Studies at Missouri S T
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The structural build-up of cement-based materials is often characterized by the determination of the evolution of static yield stress with time. This property is crucial to many applications of concrete. However, the measurement of static yield stress may disturb the structure of cement-based material. As a consequence, the true structural build-up of the materials may not be detected. In this paper, the evolution of static yield stress and storage modulus (G') determined by small amplitude oscillatory test was determined to characterize the evolution of the structural build-up of cement pastes. Results showed that G' and static yield stress developed similarly with time. When the tests were carried out on the same sample, the measurement of static yield stress disturbed the structure of cement paste and had a significant effect on the following measurement of G', but a slight effect on the following measurement of static yield stress.
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