E3S Web Conf.
Volume 237, 20213rd International Symposium on Architecture Research Frontiers and Ecological Environment (ARFEE 2020)
|Number of page(s)||6|
|Section||Architecture Science and Civil Engineering|
|Published online||09 February 2021|
Research on Flocculation of Cement Particles in Water
Department of Civil Engineering, Institute of Disaster Prevention, Langfang, China
2 School of Civil Engineering & Transportation, Beijing University of Civil Engineering and Architecture, Beijing, China
3 School of Chemical & Environmental Engineering, China Mining & Technology University(Beijing), Beijing, China
Nowadays, workability is absolutely necessary for piping concrete, which is influenced by characteristics of structure of fresh cement paste. In this paper, the movement of particles in electric field and flocculent units at different W/C were observed, and rheologic characteristics of fresh cement paste at different W/C and the pastes with naphthalene sulphonate (NS) and poly carboxylate (PC) superplasticizers were investigated using rotational viscometer (NXS-11A). It is found that at initial hydration age cement particles carry different electric quantity and electrical property; increment of W/C induces flocculent units more separated, less hysteresis loop area and lower crush point; application of superplasticizers brings much less loop area and indistinct crush point. It is concluded that 1) fresh cement paste is filled with flocculation units of different strength; 2) different units are connected with one another loosely; 3) tunnels for bleeding form in the weakest connecting area. Water can disperse flocculent units to some extent, especially for superplasticizers. However, the latter can’t separate flocculation of cement particles completely.
© The Authors, published by EDP Sciences, 2021
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