METHOD TO DETERMINE RHEOLOGICAL PROPERTIES OF HIGHLY FLUID MOULDING SANDS AND INSTRUMENT FOR REALISATION OF THIS METHOD Russian patent published in 2015 - IPC G01N11/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of instrument research of construction materials by means of determination of their physical properties, in particular, to research of rheological properties of fluid media (limit shear strength, viscosity, gradient of deformation speed) and analysis of materials by determination of their fluidity, and may be used to determine rheological properties in different moulding sands of special concretes, assessment of these properties and classification of mixtures according to rheological properties. The method to determine rheological properties of highly fluid moulding sands includes filling of the device with investigated mixes, performance of measurements and their registration, according to which the moulding mix is poured into a pipe installed vertically as capable of axial displacement without a gap between the lower end of the pipe and tray bottom. The the pipe is raised to the specified gap value between the lower end of the pipe and the tray bottom, at the same time the moulding mix leaks from the pipe and freely spreads on the tray bottom, they measure and record parameters required by the methodology: height of mix column that remained in the pipe; time of mix leakage from the pipe from the start to the end of leaking; size of spot of the spread moulding sand, and the instrument for realisation of the method to determine rheological properties of highly fluid moulding sands. The instrument comprises a reservoir for filling with moulding sands, in which the reservoir for filling with moulding sands is made in the form of the pipe installed vertically as capable of axial displacement, the instrument is equipped with a tray, a guide, rigidly installed on the tray, and a mechanism of pipe axial displacement. At the same time travel of the pipe axial displacement mechanism is chosen as equal to the gap between the lower end of the pipe and tray of the bottom, meeting the requirements of the method to determine rheological properties of moulding sands, at the same time it is equipped with a system of tray filling with water and organisation of water circulation.

EFFECT: simplifying methodology of tests and design of the instrument, expansion of operating capabilities of an item, increased validity of produced results, decreased costs of the instrument and tests.

4 cl, 2 dwg