Concrete slump measurement and control system

• US 8,858,061 B2
• Filed: 05/28/2008
• Issued: 10/14/2014
• Est. Priority Date: 05/28/2008
• Status: Active Grant

• Current Assignee: GCP Applied Technologies Inc. (Compagnie De Saint-Gobain)
• Original Assignee: Dully Katzeff-Berman
• Inventors: Berman, Berthold
• Primary Examiner(s): SOOHOO, TONY GLEN
• Application Number:
  US12/993,844
• Publication Number:
  US 20110077778A1
• Time in Patent Office: 2,330 Days
• Field of Search: 366/10, 366/12, 366/13, 366/16, 366/17, 366/142, 366/152.3
• US Class Current: 366/10
• CPC Class Codes: B28C 5/0893 Mobile mixing devices, e.g. hanging
• CPC Class Codes: B28C 5/1292 with rotating stirring and feeding or discharging means fixed on the same axis, e.g. in an inclined container fed at its lower part
• CPC Class Codes: B28C 7/02 Controlling the operation of the mixing
• CPC Class Codes: B28C 7/064 Supply from sacks; Sack openers
• CPC Class Codes: G01N 2011/0046 In situ measurement during mixing process
• CPC Class Codes: G01N 33/383 Concrete, cement
• CPC Class Codes: G05B 15/02 electric

Abstract

An apparatus and method to measure and control the slump of concrete by monitoring sensor within the interior surface of a concrete mixer and a liquid flow meter. Data is analyzed by a computer processing unit to determine the slump of the concrete, liquid needed the quantity of concrete within the mixer, the amount of concrete poured, and the starting and ending time of the pour.

Claims

1. A concrete mixing control apparatus comprising:

a concrete mixer with an interior surface;

at least one sensor to monitor one of pressure and stress attached to said interior surface of said concrete mixer;

a liquid supply tube attached to and in fluid communication with said concrete mixer;

a valve controlling the flow of a liquid through said liquid supply tube;

a liquid flow meter operatively connected to said liquid supply tube between said valve and said concrete mixer; and

a computer processing unit operably connected to said at least one sensor and said liquid flow meter so as to calculate the slump within said concrete mixer, said computer processing unit receives and analyzes data from said at least one sensor to calculate rheological property values, records a first interval of time that said at least one sensor receives a load as said concrete mixer rotates and said sensor is submerged within a concrete mixture, records a second interval of time that said at least one sensor not loaded as said concrete mixer rotates and said at least one sensor emerges from the concrete mixture, calculates a volume of the concrete mixture within said concrete mixer by analyzing said first and second intervals;

compares an output from said at least one sensor between a rotation of said concrete mixer and at least the immediately prior rotation of said concrete mixer until said output of force on said at least one sensor is generally consistent within a predetermined range of a predetermined force and calculates an amount of additional liquid to be added to the concrete mixture within the concrete mixer based on a desired slump inputted with an input device, and wherein said concrete mixing control apparatus is configured to add between approximately eighty-five (85) percent and approximately ninety-five (95) percent of said calculated amount of additional liquid to the concrete mixture.

2. A concrete mixing control apparatus according to claim 1 further comprising:

a data storage unit operably connected to said computer processing unit; and

a display operably connected to said computer processing unit.

3. A concrete mixing control apparatus according to claim 2 wherein a plurality of sensors are attached to said interior surface of said concrete mixer.

4. A concrete mixing control apparatus according to claim 2 wherein said valve is operably connected to said computer processing unit and controlled by said computer processing unit.

5. A concrete mixing control apparatus according to claim 2 further having an input means operably connected to said computer processing unit to enter one or more of a requested slump, mix and customer information.

6. A concrete mixing control apparatus according to claim 5 wherein said input means is one of a touch screen, voice recognition, keyboard and alphanumeric keypad.

7. A concrete mixing control apparatus according to claim 5 wherein said input device permits the user override the data from said sensors and said computer processing unit.

8. A concrete mixing control apparatus according to claim 2 wherein said data storage unit is in a remote location from said concrete mixer.

9. A concrete mixing control apparatus according to claim 2 further including an output means.

10. A concrete mixing control apparatus according to claim 9 wherein said output means is a printer.

11. A concrete mixing control apparatus according to claim 2 wherein said computer processing unit, input means, data storage, display and an output means separately or in combination are in a remote location from said concrete mixer, wherein said sensors, valve and flow meter are operably connected by a transmitter and a receiver at said concrete mixer and at the remote location.

12. A concrete mixing control apparatus according to claim 2 further having a global positioning satellite receiving unit having a digital output operably connected to said data storage unit.

13. A concrete mixing control apparatus according to claim 2 further having a temperature sensor attached to said interior surface of said concrete mixer and operably connected to said data storage unit.

14. A concrete mixing control apparatus according to claim 2 further having a moisture sensor attached to said interior surface of said concrete mixer and operably connected to said data storage unit.

15. A concrete mixing control apparatus according to claim 2 further having a mixer pour valve operably connected to said computer processing unit.

16. A concrete mixing control apparatus according to claim 2 wherein said computer processing unit analyses said input from said sensor to determine a start and an end time of a pour of the concrete mixture.