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US 7,021,123 B2Granted
Rheological and calorimetric testing method
AssigneeW. R. Grace & Co.-Conn.
InventorsOlafur H. Wallevik, Paul Sandberg, David F. Myers
Life of this patent
Estimating the term…
Abstract
Device and methods for rotationally mixing and rheological testing of sample liquids, such as cement particle suspensions, employ mixing blades and shear-resistant members having substantially noncoincident orbital paths. Rheology is assessed by measuring the resistance of the liquid to rotation of the device. Both rheological and calorimetric testing can be performed during mixing, which ensures uniformity of rheology and hence the accuracy of results.
Claims23
Method for assessing a sample liquid, comprising:
- mixing within a container a sample liquid and assessing the rheology of said sample liquid, said mixing and assessing comprising the use of a device having a rotatable shaft member having a generally elongate body, at least one propeller blade attached to said shaft member and having a blade face oriented to propel a liquid in a direction along said elongate shaft body when said shaft is rotated within a liquid, and at least one elongate shear-resistant member for resisting circular motion when said shaft member is rotated within the liquid, said at least one shear-resistant member being spaced at a fixed distance from, and being fixed in a fixed rotational relationship with respect to, said at least one propeller such that said at least one shear-resistant member is rotated when said at least one propeller blade is rotated, and said at least one shear-resistant member being spaced apart from and attached to said rotatable shaft member;
- and
- measuring the heat or temperature of said sample liquid over time by employing a sensor in said container.
Method for testing of a hydratable cementitious particle suspension, comprising:
- mixing within a container a hydratable cementitious particle suspension, said suspension optionally containing at least one chemical admixture selected from the group consisting of a water reducer, a plasticizer, a set accelerator, and a set retarder;
- assessing the rheology of said hydratable cementitious particle suspension;
- said mixing and assessing comprising the use of a device having a rotatable shaft member having a generally elongate body, at least one propeller blade attached to said shaft member and having a blade face oriented to propel said hydratable cementitious particle suspension in a direction along said elongate shaft body when said shaft is rotated within a liquid, and at least one elongate shear-resistant member for resisting circular motion when said shaft member is rotated within said hydratable cementitious particle suspension, said at least one shear-resistant member being spaced at a fixed distance from, and being fixed in a fixed rotational relationship with respect to, said at least one propeller blade such that said at least one shear-resistant member is rotated when said at least one propeller blade is rotated, and said at least one shear-resistant member being spaced apart from and attached to said rotatable shaft member;
- and measuring the heat or temperature of said hydratable cementitious particle suspension over time by employing a sensor in said container.
1 more element
Method for assessing a sample liquid, comprising:
- mixing within a container a sample liquid and assessing the rheology of said sample liquid, said mixing and assessing comprising the use of a device having a rotatable shaft member having a generally elongate body, at least two sets of propeller blades attached to said shaft member at different positions on said shaft member, the blades having faces oriented to propel a liquid in a direction along said elongate shaft body when said shaft is rotated within a liquid, and at least one elongate shear-resistant member for resisting circular motion when said shaft member is rotated within the liquid, said at least one shear-resistant member being spaced at a fixed distance from, and being fixed in a fixed rotational relationship with respect to, said propeller blades such that said at least one shear-resistant member is rotated when said at least one propeller blade is rotated, and said at least one shear-resistant member being spaced apart from and attached to said rotatable shaft member;
- said at least one shear-resistant member having a tapered vertical leading edge and a tapered trailing vertical edge operative to reduce cavitation in said sample liquid when said device is placed into said sample liquid within said container and rotated;
- and
- measuring the heat or temperature of said sample liquid over time by employing a sensor in said container.
1 more element
Dependencies are inferred from the claim text.