Method and system for calculating and reporting slump in delivery vehicles

A system for monitoring concrete in a concrete delivery vehicle having a concrete mixing drum and a drive system for rotating the mixing drum, comprising:

• a concrete delivery vehicle having a concrete mixing drum for containing a hydratable concrete mix to be delivered by said concrete delivery vehicle;
• a processor configured to receive data from sensors on the vehicle and to utilize said data in evaluating slump of concrete contained in the concrete mixing drum;
• a drum sensor coupled to the processor and to the mixing drum for measuring rotation speed of the mixing drum, and a drum sensor coupled to the processor and to the drive system for rotating the mixing drum for measuring the torque required for rotating the concrete mixing drum;
• a truck accelerometer sensor mounted to the concrete delivery vehicle and coupled to the processor, said truck-mounted accelerometer sensor and said processor configured to calculate tilt angle of the concrete delivery vehicle;
• said processor having access to a memory storage location containing a family of two or more curves corresponding to slump of concrete mixes, said processor being configured to compare data from at least one said drum sensor to a stored curve or curves selected from said curve family to evaluate slump of concrete mix contained in the concrete mixing drum;
• and
• the processor being further configured to evaluate slump of concrete mix contained in the concrete mixing drum based on calculated tilt angle of the concrete delivery vehicle as calculated by said processor from data received from said truck accelerometer sensor.