Research On Sonic Testing Technology Of Concrete Mixture

The coagulation properties of the concrete mixture affect the construction and structural quality of the concrete,and the initial time of concrete determines the thir rate of concrete,which is very important in actual construction.The method of current detection of concrete initial time is mainly the penetration resistance experiment on site relies on construction personnel experience and laboratory.Sonic detection technology is one of non-destructive detection techniques,since it has high precision,fast operation,and is widely used in actual engineering.According to the change in sonic parameters caused by cement hydration in concrete,the acoustic non-destructive detection technology is applied to the hydrated solidification of concrete mixtures,and different water wave characteristics of different water ash than concrete hydration is established.The relationship between.The main research contents of this paper and the results are as follows:(1)A concrete mixture sound wave detection transducer for adjustable distance adjustable,studied the effect of test distance on acoustic wave characteristics,analyzed the changes of acoustic parameters of early concrete.When the new transducer probe was buried in the concrete,the instant acoustic data was obtained,and the concrete in the fixed interval distance was timed.The results show that the sound waves of different distances have obvious sound wave attenuation,but the concrete mixture of the same water as a similar waveform is similar.The main frequency during the initial reaction of the concrete mixture does not change over time,but the main frequency amplitude has more obvious changes over time,showing the top rearward trend,knowing the frequency and the main frequency amplitude can be used to use concrete mixture work performance is corresponding.(2)A concrete initial sound wave detection device was designed,and the relationship between the concrete unit area penetration resistance value and the acoustic reflection wave energy was established,and it was determined whether or not the concrete mixture reaches the initial time.Through the design of the initial coagulation time detecting device,the relationship between the acoustic parameters and the condensation state was analyzed by the original sound waves different time than the concrete mixture.The results show that the first two reflected waves taken out of the sound wave time domain chart,respectively,the acoustic wave attenuation parameters obtained after frequency domain analysis,can better correspond to the initial coagulation time measured by the penetration resistance,and finally obtain sound waves The relationship between the parameters and the initial time,provides reliable theoretical support for subsequent software development.(3)Based on the Lab VIEW development integrated environment,it had developed automatic identification software for the concrete mixture.The software mainly had a functional module such as waveform acquisition,data processing analysis,initial intercoded time recognition.The software will take the resulting acoustic wave signal to perform frequency domain analysis and energy integration to obtain the reflected wave energy coefficient,and determine whether the concrete mixture was penetrated into the resistance value,thereby judging whether the concrete reaches the initial time.Quantitative analysis of acoustic wave signals.In this paper,the method of acoustic wave detection was carried out,and the early hydration condensation characteristics of the concrete mixture were quantitatively detected,and the conclusions derived through the Lab VIEW platform were conducive to the promotion of the concrete mixing to detect to the intelligent direction.