A method and monitoring system for predicting the initial setting process of concrete based on temperature and humidity

Abstract

The application discloses a kind of based on temperature and humidity's concrete initial setting process prediction method and monitoring system.Method includes, monitoring concrete setting process, concrete temperature and humidity data and concrete own data;Establish concrete initial setting time prediction model;Predict concrete setting progress, estimate initial setting time.System includes the monitoring device of acquisition concrete temperature humidity data, and for processing and managing data central processing system, and for concrete own data input input panel.By real-time monitoring concrete temperature humidity data and input concrete data, and data transmission to central processing system is operated, realize to the real-time monitoring of concrete initial setting process.The application adopts the design of monitoring device in combination with central processing system, can real-time synchronous acquisition monitoring point temperature and humidity data, automatically complete monitoring task;It can be based on real-time and history temperature and humidity data and concrete own data, predict concrete setting state and initial setting time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of concrete structure construction and quality detection, and particularly relates to a concrete initial setting process prediction method and monitoring system based on temperature and humidity, which is used for monitoring the concrete initial setting process by collecting concrete temperature and humidity data and determining the concrete setting time according to the data during the concrete pouring process. BACKGROUND

[0002] The setting time of concrete is an important property, which determines the time that the concrete can be safely placed and constructed. The accurate prediction of the setting time of concrete is an important link to ensure the construction quality and shorten the construction period, and therefore, it is of great significance to predict the setting time of concrete. The setting time is affected by many factors, including the type and dosage of cement, the type and size of aggregate, the water-cement ratio, the environmental temperature, the humidity and the use of additives. The environmental temperature mainly acts on the hydration process of cement, and determines the speed of the hydration of cement. Therefore, the temperature condition is generally considered as an important factor affecting the setting time of concrete. The humidity has limited influence on the hydration of cement in the initial stage of concrete pouring, but the low environmental humidity will cause the rapid evaporation of water in the surface layer of concrete, and to some extent, accelerate the setting of concrete.

[0003] In the engineering construction process, the following two methods are usually used to determine the setting time of concrete: one is to observe the curing condition, and the other is to measure the initial setting time. Since the on-site observation relies on the experience of engineering personnel, the specific setting time is difficult to quantify; the on-site initial setting time test procedure is complicated, requires a certain amount of manpower and time, and will disturb the concrete, and therefore, it is difficult to accurately determine the setting time of concrete in the actual construction process. Although researchers have tried to use different means, such as hydration heat monitoring, nuclear magnetic resonance, resistivity monitoring and ultrasonic detection, to establish a test method for the setting time of cement-based materials, and have achieved certain results, but due to the interference caused by the complex environmental factors of the actual construction site, these methods are difficult to be universally applicable.

[0004] Considering the significance of temperature and humidity in the setting process of concrete, it is feasible to use the temperature and humidity of concrete to determine the setting process of concrete. At present, some studies have referred to the change rule of temperature and humidity in the hydration process to predict the setting condition of concrete. However, during the on-site pouring and curing of concrete, the temperature and humidity are not constant, but will fluctuate with the weather temperature, which increases the difficulty of predicting the setting time of concrete. Compared with the mathematical model obtained under ideal environmental conditions, a concrete initial setting prediction model suitable for the actual construction conditions and the corresponding application system need to be developed.

[0005] Therefore, in view of the above problems, a concrete initial setting process monitoring system for determining the setting time of concrete is needed. SUMMARY

[0006] In view of the above-mentioned current industry problems in monitoring the initial setting process of concrete, in order to solve these problems and fill the gaps in the engineering field, the present application provides a real-time monitoring system for the initial setting process of concrete, which realizes the determination of the setting time of concrete and the monitoring of the initial setting process of concrete by collecting temperature and humidity data in real time through a monitoring device.

[0007] The purpose of the present application is achieved by the following technical solutions: the present application provides a method for predicting the initial setting process of concrete based on temperature and humidity, comprising:

[0008] Step one, based on the apparent activation energy of concrete, the curing environment temperature and the relative humidity, calculate the temperature factor and the humidity factor; use concrete data to calculate the concrete characteristic factor, and establish a concrete initial setting time prediction model;

[0009] Step two, monitor the temperature and humidity data and the concrete itself data in the setting process of concrete, and estimate the initial setting time based on the concrete initial setting time prediction model.

[0010] Further, the concrete initial setting time prediction model in step one is established according to the following formula group based on various data in the setting process of concrete:

[0011]

[0012]

[0013]

[0014]

[0015] In formula (1), t i is the initial setting time of concrete, the unit is hour (h); Δtα(T) is the temperature factor; β(h) is the humidity factor; is the concrete characteristic factor. In formula (2), E a is the apparent activation energy, the unit is J / mol; R is the universal gas constant, which is 8.314 J / K mol; T r is the thermodynamic temperature under standard curing environment, the unit is K; T is the temperature of actual curing environment, the unit is K. In formula (3), R h is the humidity parameter, the unit is %RH -1 ; h is the relative humidity of actual curing environment, the unit is %RH; γ0 is the humidity shape parameter, the unit is %RH. In formula (4), is the concentration of calcium ions in the concrete slurry, the unit is %; c rThe percentage concentration of the retarder is in %; a, b are concrete saturation age parameters in min; r is the retarder shape parameter.

[0016] Further, the concrete data in step one includes cement type, water-cement ratio and retarder data.

[0017] The second aspect of the present application provides a real-time monitoring system for the initial setting process of concrete based on the hydration process of concrete, characterized in that it comprises:

[0018] (1) a monitoring device for collecting concrete temperature and humidity data;

[0019] (2) a central processing system;

[0020] (3) an input system.

[0021] Further, the monitoring device comprises

[0022] (1) a temperature sensor for collecting temperature data;

[0023] (2) a humidity sensor for collecting humidity data;

[0024] (3) a data acquisition circuit board for collecting temperature and humidity data;

[0025] (4) a wireless transmission unit for transmitting data;

[0026] (5) a lithium battery for maintaining device power supply.

[0027] Further, the central processing system comprises:

[0028] (1) a monitoring data receiving end for receiving temperature and humidity data;

[0029] (2) a concrete setting time prediction model for predicting the initial setting time of concrete based on the received temperature and humidity data;

[0030] (3) a software system for realizing the functions of calling monitoring data and prediction data, displaying monitoring data and prediction results, controlling prediction model and managing job items.

[0031] Further, the input system comprises:

[0032] (1) an input panel for inputting information such as cement type, water-cement ratio and retarder type and dosage of concrete itself;

[0033] Further, the central processing system uses concrete surface temperature and humidity data and concrete setting time to predict the current setting process and initial setting time of concrete by using a setting time prediction mathematical model.

[0034] Further, the monitoring data receiving module comprises a plurality of data channel interfaces, and realizes multi-point monitoring data acquisition.

[0035] Further, the concrete setting time prediction model predicts the initial setting time of the concrete according to temperature, humidity and other data of the poured concrete and concrete self data, and performs calculation and analysis based on the established prediction model.

[0036] Further, the software system part comprises a concrete initial setting process prediction model interface program, establishes a concrete initial setting prediction system API interface, realizes calling of monitoring data and prediction data, and a software operating system, so that the monitoring system can realize initial setting time display of monitoring data and model prediction, operation project management operation, prediction model parameter information input, early warning prompt of the monitored concrete initial setting process, and other engineering task requirements.

[0037] Compared with the prior art, the present application has the following advantages:

[0038] (1) The monitoring device is used in the present application, which can synchronously collect temperature and humidity data of monitoring points in real time, and the monitoring device is light, simple to operate and has no influence on the concrete structure; wireless operation and data transmission mode are adopted, which is suitable for complex construction site environment.

[0039] (2) The central processing system is used in the present application, which can control the real-time monitoring system to automatically complete the monitoring task; based on real-time and historical temperature and humidity data, the concrete setting state can be predicted, the concrete initial setting time can be predicted, and the concrete setting process can be monitored; a software system for human-computer interaction is provided, which facilitates construction personnel to manage equipment work projects, intuitively displays the monitoring results of the concrete initial setting process, and provides a reference for guaranteeing concrete pouring construction. DETAILED DESCRIPTION

[0040] Figure 1 It is a concrete initial setting process prediction method schematic diagram in the present application;

[0041] Figure 2 It is a concrete initial setting time prediction model schematic diagram in the present application;

[0042] Figure 3 It is a concrete initial setting process real-time monitoring system schematic diagram in the present application;

[0043] Figure 4 It is a monitoring device front view schematic diagram in the present application;

[0044] Figure 5 It is a monitoring device bottom view schematic diagram in the present application;

[0045] Figure 6 It is a monitoring device top view schematic diagram in the present application;

[0046] Figure 7 Fig. 1 is a schematic diagram of the internal structure of the monitoring device in the present application;

[0047] Figure 8 Fig. 2 is a schematic diagram of the central processing system structure in the present application;

[0048] In the figure, 1. monitoring device, 2. central processing system, 3. pouring concrete, 4. temperature sensor, 5. humidity sensor, 6. data acquisition circuit board, 7. wireless transmission unit, 8. lithium battery, 9. shell, 10 monitoring data receiving module, 11. concrete setting time prediction model, 12. software system, 13. system API interface, 14. software operating system, 15. input panel. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described below by specific examples, and those skilled in the art can easily understand the advantages and effects of the present application from the disclosed content of the specification.

[0050] Please refer to Figures 1 to 2 . It should be noted that the structure, proportion, size, etc. shown in the drawings attached to the specification are only used to cooperate with the disclosed content of the specification for those skilled in the art to understand and read, and are not used to limit the defined conditions that the present application can be implemented, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the present application can produce, should still fall within the scope of the disclosed technical content of the present application.

[0051] The first aspect of the present application provides a concrete initial setting process prediction method based on a concrete initial setting time prediction model, including the following three steps as shown in Figure 1 .

[0052] Step one, monitor the concrete temperature and humidity data during the concrete setting process;

[0053] Step two, establish a concrete initial setting time prediction model;

[0054] Step three, use the concrete temperature and humidity data during the concrete setting process and the concrete itself data to predict the concrete setting process and estimate the initial setting time.

[0055] The concrete initial setting time prediction model in step two is established according to the following temperature and humidity based formula group:

[0056]

[0057]

[0058]

[0059]

[0060] In formula (1), t i is the initial setting time of the concrete, in hours (h); a(T) is a temperature factor; b(h) is a humidity factor; is a concrete property factor. In formula (2), E a is an apparent activation energy, in J / mol; R is a universal gas constant, which is 8.314 J / K mol; T r is a thermodynamic temperature under a standard curing environment, in K; T is a temperature of an actual curing environment, in K. In formula (3), R h is a humidity parameter, in %RH -1 ; h is a relative humidity of the actual curing environment, in %RH; g0 is a humidity shape parameter, in %RH. In formula (4), is a calcium ion concentration in the concrete paste, in %; c r is a percentage concentration of the retarder, in %; a, b are concrete saturation age parameters, in min; r is a retarder shape parameter.

[0061] A specific calculation process is shown in Figure 2 According to the current concrete surface temperature T received by the system, humidity h, and the previously inputted concrete self data, the initial setting time of the concrete is calculated.

[0062] Step three, according to the concrete setting time prediction model, the concrete setting process is predicted by using the concrete temperature and humidity data and the concrete self data in the concrete setting process, and the initial setting time is estimated.

[0063] The second aspect of the present application provides a real-time monitoring system for the initial setting process of concrete, as shown in Figure 3 The monitoring device 1 is arranged on the surface of the cast concrete 3 to collect the concrete temperature and humidity data, the central processing system 2 receives the temperature and humidity data collected by the monitoring device 1, processes and calculates the data according to the internal model of the system, predicts the initial setting time and the current setting state of the concrete, and displays the concrete temperature and humidity data and the prediction results through the interactive output module, which is used to guide the cast construction operation.

[0064] Specifically, the monitoring device 1 monitors the temperature data on one side close to the surface of the cast concrete 3 to collect the concrete surface temperature data, and monitors the humidity data on the other side to collect the humidity data near the concrete; the monitoring device 1 transmits the collected data to the central processing system 2 through wireless transmission; the central processing system 2 receives the data collected by the monitoring device through the monitoring data receiving module 11 and stores the data, and transmits the data to the concrete setting time prediction model 11, calculates the initial setting time of the concrete through the prediction model, and provides the calculated results and the received temperature and humidity data of each monitoring device to the user through the software system 12, and the user can also adjust the prediction model and perform operation such as project management through the software system 12.

[0065] The above concrete temperature and humidity monitoring device, as shown in Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 , includes a temperature sensor 4 for collecting temperature data, a humidity sensor 5 for collecting humidity data, a data acquisition circuit board 6 for collecting temperature and humidity data, a wireless transmission unit 7 for transmitting data, a lithium battery 8 for maintaining power supply of the device, and a housing 9 for installing an input panel 15 and protecting the internal structure. One side of the data acquisition circuit board 6 is connected with the temperature sensor 4 and the humidity sensor 5 to collect the temperature and humidity data of the concrete, and the other side is connected with the wireless transmission unit 7 to transmit the collected data; the lithium battery 8 is connected with the data acquisition circuit board 6 and the wireless transmission unit 7 to supply power. In this way, the collection and wireless transmission of the temperature and humidity data of the concrete are realized.

[0066] Specifically, the above temperature sensor 4 and humidity sensor 5 can adopt AHT20-F integrated temperature and humidity sensor; the wireless transmission unit 7 adopts half-duplex standard I2C protocol for communication to realize data transmission.

[0067] The above central processing system, specifically, as shown in Figure 8 , can obtain temperature and humidity data by wireless mode, monitor the setting process of the concrete, and predict the initial setting time of the concrete, including a monitoring data receiving module 10 for receiving temperature and humidity data, a concrete setting time prediction model 11 for predicting the initial setting time of the concrete according to the received temperature and humidity data and the data of the concrete itself, and a software system 12 for realizing data calling, result display, system control and project management functions of the detection system.

[0068] The monitoring data receiving module receives the temperature and humidity data sent by the monitoring device 1 and provides the data to the concrete setting time prediction model 11; the concrete setting time prediction model 11 establishes a mathematical model based on the relationship between the concrete setting state and the hydration heat release and humidity change, predicts the initial setting time of the concrete according to the received temperature and humidity data; the software system 12 establishes a system API interface 13, can access the received data and the model prediction data, and provides a software operation system 14 for the user, realizes the display of the system monitoring data and the system prediction data, and simultaneously provides an input panel 15 for the user, including a project management operation module, a prediction model parameter information input module, a monitoring concrete initial setting process end early warning prompt and the like services.

[0069] Specifically, the monitoring data receiving module 10 adopts a half-duplex standard I2C protocol for communication to realize data receiving; the concrete setting time prediction model 11 can establish a basic mathematical model based on temperature and humidity; and the software system 12 can be programmed by using a c++ language.

[0070] The above embodiments are used to explain and illustrate the present application, rather than limit the present application, and any modification and change made to the present application within the spirit of the present application and the protection scope of the claims falls into the protection scope of the present application.

Claims

1. A method for predicting the initial setting process of concrete based on temperature and humidity, characterized by, The application relates to a concrete initial setting time prediction method and a concrete initial setting time prediction system. Step one: based on the apparent activation energy of concrete, the curing environment temperature and relative humidity, a temperature factor and a humidity factor are calculated; based on concrete data, a concrete characteristic factor is calculated, and a concrete initial setting time prediction model is established; and the model is established according to the following formula group based on various data in the concrete setting process: （1） （2） （3） （4） In formula (1), t i is the initial setting time of concrete, in hours (h); is the temperature factor; is the humidity factor; is the concrete property factor; in formula (2), E a is the apparent activation energy, in J / mol; R is the universal gas constant, which is 8.314 J / K mol; T r is the thermodynamic temperature under the standard curing environment, in K; T is the temperature of the actual curing environment, in K; in formula (3), R h is the humidity parameter, in %RH -1 h is the relative humidity of the actual curing environment, in %RH; is the humidity shape parameter, in %RH; In formula (4), c is the concentration of calcium ions in the concrete paste in %; c r c is the concentration of calcium ions in the concrete paste in %; c a, b are concrete saturation age parameters in min; r is a retarder shape parameter; Step two: temperature and humidity data and concrete self data in the concrete setting process are monitored, and the initial setting time is estimated based on the concrete initial setting time prediction model.

2. The method for predicting the initial setting process of concrete based on temperature and humidity according to claim 1, characterized in that, The concrete data in step one include cement type, water-cement ratio and retarder data.

3. A temperature and humidity based real-time monitoring system for the setting process of concrete, which implements the method according to any one of claims 1 to 2, characterized in that, The application further relates to a concrete initial setting time prediction system. The monitoring device comprises: The central processing system comprises: The input system comprises:

4. The system for real-time monitoring of the initial setting process of concrete based on temperature and humidity according to claim 3, characterized in that, The central processing system uses concrete surface temperature, humidity and concrete self data to predict the current setting process and the initial setting time of concrete by using the concrete initial setting time prediction model. The monitoring data receiving end comprises multiple data channel interfaces to realize multi-point monitoring data acquisition. The software system comprises a concrete initial setting process prediction model interface program, a concrete initial setting prediction system API interface is established, and the monitoring data and the prediction data are called; a concrete characteristic parameter database is used to process the input data; The software operating system enables the monitoring system to display the initial setting time of the monitoring data and the model prediction, to operate the project management, to input the prediction model parameter information, and to give a warning prompt when the monitored concrete setting process will end. ​ ​ 5. The system for real-time monitoring of the initial setting process of concrete based on temperature and humidity according to claim 3, characterized in that, ​ ​ ​ ​ 6. The system for real-time monitoring of the initial setting process of concrete based on temperature and humidity according to claim 3, characterized in that, ​ ​ 7. The system for real-time monitoring of the initial setting process of concrete based on temperature and humidity according to claim 5, characterized in that, ​ 8. The system for real-time monitoring of the initial setting process of concrete based on temperature and humidity according to claim 5, characterized in that, ​ 9. The system for real-time monitoring of the initial setting process of concrete based on temperature and humidity according to claim 5, characterized in that, ​ ​

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