The use of the capillary rheometer for the rheological evaluation of extrudable cement-based materials

被引：17
|
作者：
Alfani, Roberta
Grizzuti, Nino
Guerrini, Gian Luca
Lezzi, Gianluca
机构：
[1] Univ Studi Napoli Federico 2, Dipartimento Ingn Chim, I-80125 Naples, Italy
[2] CTG Italcementi Grp, I-24121 Bergamo, Italy
来源：
RHEOLOGICA ACTA | 2007年 / 46卷 / 05期
关键词：
cement paste; capillary rheometry; slit die;
D O I：
10.1007/s00397-007-0164-0
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
In this paper, the rheological properties of an extrudable cement-based paste are investigated by means of an original ram extrusion apparatus (capillary rheometer). The experimental results indicate that a careful measurement of the die pressure is necessary to obtain a realistic viscosity vs shear rate curve, as required in extrusion technology. In particular, it is shown that the optimal test configuration is when the pressure measurement is made directly inside the rheometer die. By applying this rheological methodology in steady-state conditions, it has been observed that the extrudable cement-based material here evaluated obeys to a simple power-law equation, in the range of shear rates investigated, which are suitable for an industrial extrusion process.
引用
收藏
页码：703 / 709
页数：7
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