| Title |
A Useful Rheometer for Cement Paste in Field |
| Keywords |
Rheology ; Rheometer ; Cement Paste ; Yield Stress ; Plastic Viscosity |
| Abstract |
Rheological tests on cement paste were necessary for evaluation of workability on field. The slump, mini cone, and marsh cone test are common methods for assessing the flow properties of fresh cement paste and concrete. Although these methods provide quantitative measures of workability, the relationship between these methods and more quantitative rheological parameters is not fully understood. Some appliances for more accurate measurement are recently proposed. However, these are too expensive to use in field. Therefore, the goal is to propose the simple, cheap and useful rheometer for measuring the rheological properties of cement paste and concrete. In this study, C-P Rheometer consisting of a cylinder and a pipe is proposed. Yield stress of cement paste is calculated by measuring the height of cement paste in cylinder when it finishes dropping. Plastic viscosity is also done by measuring the time for cement paste to drop and pass through the range between two fixed heights of cylinder. The new rheometer is in excellent agreement with the experimental yield stress and plastic viscosity data obtained using the authorized rheometer(Brookfield RVDVⅢ+). The conclusion is that this new simple rheometer is reliable for measuring the rheological properties of cement paste. |