Admixture dispensing and concrete mixer monitoring method

• US 6,042,258 A
• Filed: 10/14/1997
• Issued: 03/28/2000
• Est. Priority Date: 07/31/1996
• Status: Expired due to Term

• Current Assignee: Construction Research & Technology GmbH (BASF SE)
• Original Assignee: MBT Holding AG
• Inventors: Whitehead, Michael, Hines, Kelly
• Primary Examiner(s): Cooley, Charles E.
• Application Number:
  US08/949,814
• Time in Patent Office: 896 Days
• Field of Search: 366/1, 366/2, 366/6, 366/8, 366/16-19, 366/30, 366/33, 366/132, 366/140, 366/151.1, 366/34, 366/152.1, 366/182.1, 366/348, 366/349, 364/528, 364/528.1, 364/528.18
• US Class Current: 366/8
• CPC Class Codes: B28C 7/024 by measuring properties of the mixture, e.g. moisture, electrical resistivity, density
• CPC Class Codes: B28C 7/0418 control systems therefor

Abstract

An admixture dispensing and concrete mixer monitoring system which determines the correct amount of admixture, such as a stabilizer, to dispense in a load of unused concrete or for washing out a concrete mixer includes an admixture dispensing unit linked to a computer system. The computer system includes a processor which controls and monitors the operation of the dispensing unit which includes an admixture piping system and a water piping system. The processor is linked to various pumps, meters and valves in the admixture and water piping systems to control the flow of admixture and water into the concrete mixer. Additionally, the computer system provides questions and prompts to the user to assist in accurately and quickly determining the correct amount of admixture to deposit in the concrete mixer. The computer system also allows the tracking of multiple delivery or mixing trucks and their content status at multiple mixing plants to assist in the scheduling thereof.

Claims

1. A method for monitoring at least one concrete mixing truck and its contents, comprising the steps of:

determining a content status of at least one of a fleet of concrete mixing trucks wherein said content status is one of returning from a job site empty, returning from a job site with unused concrete, going to a job site and is currently empty, and going to a job site and currently contains unused concrete;

calculating a quantity of admixture, a quantity of water, and a quantity of other concrete ingredients depending upon the findings of said determining step; and

storing the identity of the at least one concrete mixing truck and the quantity of admixture, the quantity of water, and the quantity of other concrete ingredients, which were calculated, wherein said steps of calculating and storing all occur in a processor.

2. The method according to claim 1 wherein if the at least one concrete mixing truck is returning from the job site and is empty, the method further includes the steps of:

depositing the calculated quantity of admixture and water in the at least one concrete mixing truck; and

storing the fact that the quantity of admixture and quantity of water were deposited.

3. The method according to claim 1 wherein if the at least one concrete mixing truck is returning from a job site and contains unused concrete, the determining step further includes ascertaining the amount of unused concrete carried by a returned concrete mixing truck and the method further includes the steps of:

depositing the calculated quantity of admixture in the returned concrete mixing truck; and

storing the fact that the quantity of admixture was deposited.

4. The method according to claim 3, wherein the determining step further comprises ascertaining the temperature of the unused concrete, and the calculating step further includes calculating the quantity of admixture based on the temperature of the unused concrete and the content status of the returned concrete truck.

5. The method according to claim 1 wherein if the at least one concrete mixing truck is going to a job site and is empty, the method further includes the steps of:

depositing the quantity of admixture, the quantity of water and the quantity of other concrete ingredients determined in the calculating step in the at least one concrete mixing truck; and

storing the fact that the quantity of admixture, the quantity of water, and the quantity of other concrete ingredients were deposited.

6. The method according to claim 5, wherein the determining step further comprises ascertaining the temperature of a mixture of the quantity of water and the quantity of other concrete ingredients prior to depositing the quantity of admixture, and the calculating step further includes calculating the quantity of admixture based on the temperature of the mixture and the content status of the at least one concrete truck.

7. The method according to claim 1 wherein if the at least one concrete mixing truck is going to a job site and contains unused concrete, the determining step further includes ascertaining the amount of unused concrete carried by a returned concrete mixing truck and the method further includes the steps of:

depositing the calculated quantity of admixture, water and other concrete ingredients in the at least one concrete mixing truck; and

storing the fact that the quantity of admixture, quantity of water, and quantity of other concrete ingredients were deposited.

8. The method according to claim 7, wherein the determining step further comprises ascertaining the temperature of the unused concrete, and the calculating step further includes calculating the quantity of admixture based on the temperature of the unused concrete and the content status of the at least one concrete truck.

9. The method according to claim 1 wherein if a concrete mixing truck is needed for a job site, the method further includes the steps of:

retrieving from a processor memory the identity of trucks stored in memory;

selecting from said processor memory one of the concrete mixing trucks for use at the job site based upon predetermined selection criteria; and

calculating a quantity of admixture to be included with the selected concrete mixing truck.

10. The method according to claim 9, wherein the determining step further comprises ascertaining the temperature of the unused concrete in the concrete mixing truck that currently contains unused concrete, and the calculating step further includes calculating the quantity of admixture based on the temperature of the unused concrete and the content status of the at least one concrete truck.

11. The method according to claim 1, wherein the calculating step for calculating the quantity of admixture to be dispensed in the concrete mixing truck comprises the steps of:

storing in look-up tables data for determining admixture quantities to be dispensed;

storing in memory input questions to be answered by a user;

processing by the processor the answers provided by the user to select which stored look-up table to access to determine admixture quantities; and

calculating a quantity of admixture from said selected look-up table and the answers provided by the user.

12. The method according to claim 11, further comprising the step of

storing in memory a status of each concrete mixing truck in the fleet of concrete mixing trucks and an amount of unused concrete, if any, contained in each concrete mixing truck.

13. The method according to claim 12, further comprising the step of

displaying the status of the concrete mixing trucks available for use and their respective contents.

14. The method according to claim 12, further comprising the step of

scheduling by the processor which concrete mixing truck should be sent to a job site next based upon answers to the input questions and the status of each truck.

15. The method according to claim 12, further comprising the step of

retrieving from memory the admixture content of the unused concrete carried by a selected concrete mixing truck, whereby the retrieved admixture content and the answers to the input questions are used by the processor to select one of said stored look-up tables.

16. The method according to claim 15, further comprising the step of

adjusting by a percentage the calculated admixture quantity based upon input from the user.

17. The method according to claim 16, further comprising the step of

generating a signal to dispense the calculated quantity of admixture based upon input from the user.

18. The method according to claim 11, further comprising the step of

adjusting by a percentage the calculated admixture quantity based upon input from the user.

19. The method according to claim 18, further comprising the step of

generating a signal to dispense the calculated quantity of admixture based upon input from the user.

20. The method according to claim 11, further comprising the step of

outputting selected reports based upon input from the user.

21. The method according to claim 11, further comprising the step of

generating a signal to dispense the calculated quantity of admixture based upon input from the user.