Device and method for producing a concrete, in particular a high early strength concrete

Abstract

A device for producing a concrete includes a cement premixer for mixing a cement suspension, the cement premixer having an ultrasonic probe for preparing a cement suspension, a crystallization tank arrangement with the first crystallization tank, for increasing the early strengths of the concrete, and a concrete mixer for producing a concrete mixture from the premixed cement suspension, in particular with the addition of aggregates.

1 - 26 . (canceled) 
     
     
         27 . A device for producing a concrete, the device comprising
 i a cement premixer configured to mix a cement suspension, wherein the cement premixer has at least one ultrasonic generator, which is at least one ultrasonic probe, to provide a cement suspension;   ii at least one first crystallization tank, which is a crystallization tank arrangement having the at least one first crystallization tank, configured to increase the early strengths of the concrete;   iii a concrete mixer configured to produce a concrete mixture from the premixed cement suspension, with the addition of aggregates; and   iv. a sensor configured to determine a temperature of the cement suspension.   
     
     
         28 . The device of  claim 27 , wherein the cement premixer, the at least one first crystallization tank, and the concrete mixer are arranged with respect to an earth gravity field in such a way that the cement suspension is flowable by gravity from the cement premixer into the at least one first crystallization tank and from the at least one first crystallization tank into the concrete mixer. 
     
     
         29 . The device of  claim 27 , further comprising:
 a second crystallization tank arranged between the at least one first crystallization tank and the concrete mixer, the second crystallization tank having a separate agitator.   
     
     
         30 . The device of  claim 29 , wherein at least one of the at least one first crystallization tank and the second crystallization tank has an arrangement configured to detect a measured variable and to control an emergency draining of the at least one first crystallization tank or the second crystallization tank. 
     
     
         31 . The device of  claim 30 , further comprising:
 a feed device, which is a metering device, configured to supply a flow medium as a function of the detected measured variable.   
     
     
         32 . The device of  claim 29 , wherein the at least one first crystallization tank or the second crystallization tank is configured for a quantity of between 1.5-4 cubic meters of a cement suspension. 
     
     
         33 . The device of  claim 29 , wherein the at least one first crystallization tank or the second crystallization tank comprises a heat exchanger arrangement, which is a double-wall segment, configured to control the temperature of the cement suspension along a wall of the crystallization tank. 
     
     
         34 . The device of  claim 27 , further comprising:
 a cement storage silo having a first partial supply line of cement to the cement premixer and a second partial supply line of cement to the concrete mixer; and   a cement weigher configured to meter a first partial amount of cement to the cement premixer and to meter a second partial amount of cement to the concrete mixer.   
     
     
         35 . The device of  claim 29 , wherein the at least one first crystallization tank or the second crystallization tank includes a sensor element configured to determine a quality of the cement suspension located in the crystallization tank, wherein the sensor element is a temperature sensor, a torque sensor, a conductivity sensor configured to determine thermal or electrical conductivity, a sensor configured to determine ultrasonic transit time or the ultrasonic velocity, or a density sensor. 
     
     
         36 . The device of  claim 35 , further comprising:
 a control unit, an evaluation unit, or a control and evaluation unit configured to control an actuator based on the measured values determined by the sensor element, wherein the actuator is a temperature control device, an inlet valve, or an outlet valve.   
     
     
         37 . A method for producing a concrete with the device of  claim 27 , the method comprising:
 i) preparing a cement suspension in the cement premixer using ultrasound;   ii) stirring the cement suspension in the at least one first crystallization tank for a predetermined residence time; and   iii) transferring the cement suspension to the concrete mixer after a predetermined residence time.   
     
     
         38 . The method of  claim 37 , wherein the cement premixer comprises a treatment space, wherein the at least one ultrasonic probe at least partially projects into the treatment space, and wherein the ultrasonic probe emits ultrasound, wherein the emitted ultrasound has an intensity of 25-250 W/cm 2  and an amplitude of 15-500 μm. 
     
     
         39 . The method of  37 , wherein control of the predetermined residence time is performed as a function of a predetermined time at a predetermined temperature or the predetermined residence time of the cement suspension is based on a previously determined heat release. 
     
     
         40 . The method of  claim 37 , wherein the predetermined residence time of the cement suspension before transfer to the concrete mixer is between 1-8 hours. 
     
     
         41 . The method of  claim 37 , wherein a proportion of pretreated cement in the concrete is between 10-25 wt. %.