KR20100031237A - A solidity measuring instrument of concrete - Google Patents

A solidity measuring instrument of concrete Download PDF

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Publication number
KR20100031237A
KR20100031237A KR1020080090229A KR20080090229A KR20100031237A KR 20100031237 A KR20100031237 A KR 20100031237A KR 1020080090229 A KR1020080090229 A KR 1020080090229A KR 20080090229 A KR20080090229 A KR 20080090229A KR 20100031237 A KR20100031237 A KR 20100031237A
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South Korea
Prior art keywords
temperature
concrete
strength
unit
temperature sensor
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KR1020080090229A
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Korean (ko)
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백주현
유동수
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주식회사 리더스큐엠
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Priority to KR1020080090229A priority Critical patent/KR20100031237A/en
Publication of KR20100031237A publication Critical patent/KR20100031237A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
    • G01N33/383—Concrete or cement

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

PURPOSE: A concrete strength meter is provided to conveniently calculate accumulated temperature and early strength of concrete, and to improve the durability of a concrete structure. CONSTITUTION: A concrete strength meter comprises a temperature sensor(10), an operation unit(30), a calculation unit, and an output unit(50). The temperature sensor measures curing temperature of concrete. The operation unit sets-up a constant value for changing power on/off, measuring conditions, and strength. The calculation unit calculates accumulated temperature and early strength of concrete based on the set condition and the measured temperature. The output unit outputs the accumulated temperature and the early strength calculated from the calculation unit.

Description

A solidity measuring instrument of concrete

The present invention relates to a concrete strength measuring device, and more specifically, by using the measured cumulative temperature (hereinafter referred to as "accumulation temperature") to predict the early strength of the initial structure of the construction and through this the optimum curing period of the structure to calculate the shortest The present invention relates to a concrete strength meter capable of suggesting when to remove the mold.

In order to satisfy the three-day process in the field during the construction of high-rise structures that are being built in recent years, it is used as a criterion for determining the time to remove the mold by determining the early strength of concrete such as 18 hours and 24 hours. In this case, the early strength of the concrete to be measured is a basic element for evaluating the safety during the next construction of the structure, and is essential not only to prevent a safety accident during construction, but also to be a basic factor for evaluating the properties of the later strength expression.

The early strength of concrete is considered as a very important data as a criterion for eliminating the mold during the construction of high-rise structures.However, the curing method of the specimens for the measurement of early strength is mainly cured in the atmosphere, so the experimental values of the specimens and the actual Since the strength is different due to the influence of the outside temperature, the strength evaluation of the actual structure may be inaccurate. As such, if the strength result determined by other conditions is different from the strength of the actual structure and the required strength is insufficient, it may lead to a problem of safety accident at the next construction.

Therefore, in the field, by checking the strength of the structure concrete early and demolding the formwork at the earliest time, there are various methods to prevent safety accidents during construction and to secure economic feasibility by shortening the construction period and improve the durability of the structure. Is trying.

One of the methods introduced as an early estimation method of the strength of concrete structures is the method of estimating concrete strength using integration temperature (Maturity).

The strength of concrete is a curing period that is closely related to the curing temperature of the concrete and the curing temperature of the concrete. The cumulative temperature of the curing age and the curing temperature of the concrete is accumulated temperature. The strength of the concrete afterwards can be inferred.

However, the early estimation of the concrete strength using the integrated integration temperature is recorded by the operator measuring the curing temperature of the concrete daily using a temperature measuring instrument at the construction site, and calculating the integrated temperature using the recorded temperature according to the curing period. Since the strength of the concrete must be estimated, not only the work was very inconvenient but also difficult to accurately estimate the strength.

In addition, when experimenting with the integration temperature, due to many variables, the three or more regression equations were calculated according to each age, there was a problem that is quite difficult to use in the field.

Accordingly, it is an object of the present invention to provide a concrete strength measuring device that can easily calculate the integration temperature and early strength of concrete.

Accordingly, by accurately checking the strength of the structure concrete early and demolding the formwork at the earliest time, it is possible to prevent safety accidents during construction and to secure economics and durability of the structure by shortening the construction period.

In addition, it is an object of the present invention to apply the integrated temperature to the early appearance of concrete, and experimented in several sites to show the relationship between the integrated temperature and the concrete strength in the case of the early age of the second age, the structure It is to provide a concrete strength meter that can confirm the early strength by temperature measurement.

According to the present invention, in the concrete strength meter, the temperature sensor for measuring the curing temperature of the concrete, the operation unit for setting the constant value for power on and off and the measurement conditions and strength conversion of the temperature sensor, and the temperature An operation unit for calculating the integration temperature and early strength of the concrete based on the temperature value transmitted from the sensor and the conditions set in the operation unit, the temperature value measured by the temperature sensor and the integration temperature and early of the concrete calculated by the operation unit It is achieved by a concrete strength meter, characterized in that it has an output unit for outputting strength.

Here, the operation unit has a time setting button for setting the temperature measurement time of the temperature sensor at predetermined time intervals and a constant input button for inputting a constant value when converting the intensity, the operation unit has a temperature sensor at a predetermined time interval set in the operation unit Accumulation temperature is calculated by accumulating the curing temperature of the concrete delivered from, and it is preferable to obtain the early strength of the concrete based on the calculated integration temperature.

In addition, it is effective to have a liquid crystal display that displays at least the temperature value measured by the temperature sensor in real time, and a printer that outputs the temperature value measured by the temperature sensor, the accumulated temperature, and the early strength of the concrete as a data sheet.

On the other hand, the above object is, according to another aspect of the present invention, in the concrete strength meter, the temperature sensor for measuring the curing temperature of the concrete, the transmission side operation unit for setting the power on and off and the measurement conditions of the temperature sensor, and the temperature A temperature measuring unit having a transmitting unit which wirelessly transmits the temperature value measured by the sensor to the outside; A receiver for wirelessly receiving the temperature value transmitted from the transmitter, an operation unit for setting a constant value for strength conversion, curing temperature of the concrete transmitted through the receiver and the setting conditions of the concrete The concrete strength measuring device comprising a measuring base unit having an calculating unit for calculating the integrated temperature and early strength, and an output unit for outputting the integrated temperature and the early strength of the concrete value calculated by the calculating unit and the temperature value transmitted to the receiving unit. Is also achieved.

Here, the measurement main body is provided with an operation unit for turning on and off the power of the measurement main body, and setting the measurement conditions of the temperature sensor to be interlocked with the transmission side operation unit; The transmission side manipulation section and the manipulation section have a time setting button for setting a temperature measurement time of the temperature sensor at predetermined time intervals; It is preferable that the calculation unit accumulates the curing temperature of the concrete delivered to the receiving unit at predetermined time intervals set by the transmitting side operation unit and the operation unit to calculate the integration temperature, and obtain the early strength of the concrete based on the calculated integration temperature. .

In addition, it is effective that the output unit has a liquid crystal display which displays at least the temperature value received by the receiver in real time, and a printer which outputs the temperature value received by the receiver, the accumulated temperature and the early strength of the concrete as a data sheet.

In addition, the temperature measuring device is preferably provided with a display unit for displaying the curing temperature of the concrete measured by the temperature sensor.

Thereby, the concrete strength measuring machine which can calculate the integration temperature and early strength of concrete simply is provided.

In addition, by using this to accurately confirm the strength of the structure concrete early and demoulding the formwork at the earliest time, it is possible to prevent the safety accidents during construction, as well as to secure the economics and durability of the structure by shortening the construction period.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

1 is a simplified perspective view of a concrete strength meter according to a first embodiment of the present invention, FIG. 2 is a state diagram of use of the concrete strength meter of FIG. 1, and FIG. 3 is a control block diagram of the concrete strength meter of FIG. 1. As shown in these drawings, the concrete strength meter 1 according to the present embodiment accumulates by accumulating the temperature sensor 10 for measuring the curing temperature of the concrete and the curing temperature of the concrete delivered from the temperature sensor 10 It has a measuring base 20 for calculating the temperature and early strength of concrete.

The temperature sensor 10 may be embedded in the cured concrete, and may form a sensing hole or the like in one region of the formwork 3 and detect the curing temperature of the concrete through the sensing hole. The temperature sensor 10 preferably includes a signal connecting line 11 and a measuring device connecting plug 13 provided at the distal end of the signal connecting line 11 so as to transmit the temperature value detected by the measuring base 20. Of course, the temperature sensor 10 may be provided integrally with the measuring instrument.

The measuring body 20 is set in the control unit 30 and the curing temperature of the concrete delivered from the temperature sensor 10 and the control unit 30 for setting a constant value for driving and measuring conditions and strength conversion of the device The calculation unit 40 calculates the integration temperature and the early strength of the concrete based on the condition, and outputs the concrete curing temperature transmitted from the temperature sensor 10 and the integration temperature calculated by the calculation unit 40 and the early strength of the concrete. And a power supply unit 60 for supplying driving power.

The inside of the measuring base 20 is formed as a receiving space constituting the measuring base 20. In one region of the measuring base 20, a sensor connection terminal 21 is provided to transfer the concrete curing temperature measurement value transmitted from the temperature sensor 10 to the calculation unit 40. The sensor connection terminal 21 is preferably provided in a form corresponding to the measuring device connecting plug 13 of the temperature sensor 10, by being electrically connected to the operation unit 40 provided inside the measuring base 20, The concrete curing temperature transmitted from the temperature sensor 10 is transferred to the calculation unit 40.

Although not shown, the measuring base 20 is preferably provided with an attachment means (not shown) such as a clamper or a locking groove so that the concrete can be easily attached to the outside of the formwork 3 in which the concrete is placed.

In addition, it is preferable that a battery storage space for accommodating the battery as the power supply unit 60 is provided in the inner region of the measurement base 20 so as to be opened and closed by the battery cover.

The operation unit 30 is provided at an appropriate position on the front of the measuring body 20. The configuration is a power button 31 for turning on / off the main power of the apparatus, and a time setting button 33 for setting a temperature measuring time. And an input setting button 32 for setting a constant value for intensity conversion, and a print driving button 35 for printing driving the output unit 50 to be described later. Among these, the time setting button 33 is provided to be set in units of hours and minutes, and in some cases, it is possible to set a more granular time unit, and the input setting button 32 can input up to 4 decimal places. In some cases, more decimal point processing can be performed.

On the other hand, the calculation unit 40 calculates the integrated temperature by accumulating the curing temperature of the concrete delivered from the temperature sensor 10 at a predetermined time interval set by using the time setting button 33 of the operation unit 30 and this integration temperature And using the constant value input from the input setting button 32 to estimate the early strength of the concrete. Then, the curing temperature of the concrete delivered to the calculation unit 40 and the integrated temperature calculated by the calculation unit 40 and the early strength of the concrete is displayed to the outside through the output unit 50 to be described later.

The integrated temperature calculated by the calculating unit 40 is a value obtained by accumulating the curing age of the concrete curing period and the curing temperature of the concrete delivered from the temperature sensor 10, and is calculated by the following equation-1.

M = ∑ (θ + A) Δt Equation-1

Where M is the integration temperature, where unit is '℃' or '℃', Δt is the time to measure the average curing temperature, and 'hour' or 'day', θ is the average concrete curing temperature during Δt time, A Is an integer between 10 and 15)

In addition, the calculation unit 40 estimates the early strength of the concrete using the integration temperature obtained by Equation-1 and the constant value input from the input setting button 32. The constant value is used according to various individual building sites. Since the mixing, materials, and components of paper are different, the field data obtained through mock-up test and pre-compressive strength test in advance are used in the field, and this constant value and the integrated temperature (M) obtained by Equation-1 and calculation The early strength of concrete is estimated by

For example, if the constant values determined by mock-up test and pre-compressive strength test are 0.0075 and -1.2336 according to the different formulations, materials and components used for each site, the early strength of concrete is given in Equation-2 below. It can be estimated by

Y = (0.0075M) + (-1.2336) Equation-2

Where Y is the concrete early strength estimate, M is the cumulative temperature of Equation-1, and 0.0075 and -1.2336 are determined by mock-up and pre-compressive strength tests as the formulations, materials, and components used differ from site to site. Is a constant value)

Therefore, when the early strength of the concrete is determined by calculating the integration temperature for a predetermined time using the above equations 1 and 2, the demoulding timing of the formwork 3 is determined at the point of having the optimum early concrete strength. You can decide.

On the other hand, the output unit 50 is provided with a liquid crystal display 51 and a printer 53 that the user can visually check the curing temperature and integration temperature of the concrete and the early strength of the concrete and output the data sheet.

The liquid crystal display 51 basically displays the curing temperature of the concrete detected by the temperature sensor 10 in real time. In addition, the liquid crystal display 51 may display the integrated temperature calculated by the operation unit 40 and the early strength of the concrete, which is provided by the display selection unit (not shown) to display data desired by the operator through the liquid crystal display 51. You can optionally check.

The printer 53 is provided in a form in which the data sheet of the wound form can be replaced. The printer 53 prints on a data sheet a date and measurement time, measured curing temperature and integration temperature, and early strength of concrete at predetermined time intervals according to the setting values of the operation unit 30.

On the other hand, the power supply unit 60, as described above, is preferably provided with a replaceable battery or a rechargeable internal battery, it may be provided in a configuration by connecting a general external power using an adapter or the like.

The concrete strength measuring device 1 according to the present embodiment having such a configuration calculates the curing temperature of the concrete delivered from the temperature sensor 10 as the integrated temperature in the calculation unit 40 and uses the integrated temperature to calculate the early strength of the concrete. By obtaining and allowing the operator to check through the output unit 50, it is very easy to calculate the integration temperature and early strength of the concrete, by using it to accurately check the strength of the structure concrete early and demoulding formwork at the earliest Thus, it is possible to prevent safety accidents in construction as well as to secure economics and durability of the structure due to a shortening of the construction period.

On the other hand, Figure 4 is a simplified perspective view of a concrete strength meter according to a second embodiment of the present invention, Figure 5 is a state diagram of the concrete early curing temperature meter of Figure 4, Figure 6 is a block diagram of the concrete strength meter of Figure 4 . As shown in these figures, the concrete strength measuring device 1 'according to the present embodiment wirelessly measures the temperature measurement value from the temperature measuring device 10' and the temperature measuring device 10 'for measuring the curing temperature of the concrete. Accumulated curing temperature of the transmitted and transmitted concrete has a measurement base 20 for calculating the integration temperature and the early strength of the concrete.

The temperature measuring device 10 'includes a temperature sensor 11' for measuring the curing temperature of the concrete, a transmission side control unit 13 'for setting constant values for driving and measuring conditions of the device and converting the strength, and a temperature sensor. A transmission unit 15 'for wirelessly transmitting the curing temperature of the concrete measured at 11' to the measurement base 20, a display unit 17 'for displaying the curing temperature of the concrete measured at the temperature sensor 11'; And a transmission power supply unit 19 'for supplying power.

The temperature sensor 11 ′ may be embedded in the cured concrete, and may form a sensing hole or the like in one region of the formwork 3 and detect the curing temperature of the concrete through the sensing hole.

In addition, the transmission side control unit 13 'is provided at an appropriate position in front of the temperature measuring instrument 10'. The configuration includes a power button 13a 'for turning on / off the power of the temperature measuring instrument 10' and a temperature measuring time. It consists of a time setting button 13b 'for setting and an input setting button 13c' for setting a constant value for intensity conversion. Of these, the time setting button 13b 'is provided to be set in units of hours and minutes, and in some cases, a more detailed time unit can be set, and the input setting button 13c' can be set to 4 decimal places. It is provided so that input is possible, and in some cases, more decimal point processes can be made possible. At this time, the transmission side operation unit 13 ′ may be provided to interlock with the operation unit 30 of the measurement basic body 20 to be described later.

The transmission unit 15 'is a real-time measurement of the curing temperature of concrete measured by the temperature sensor 11' through a wireless transmission antenna 15a 'provided in one region of the temperature measuring instrument 10'. Deliver to receiver. The display unit 17 'is preferably provided with a liquid crystal display to display the curing temperature of the concrete detected by the temperature sensor 11' in real time.

In addition, the transmission power supply unit 19 ′ is formed of a battery that is exchangeably provided in one region of the temperature measuring device 10 ′.

On the other hand, the measuring body 20 is the control unit 30 for setting the constant value for driving and measuring conditions and strength of the instrument, and the concrete curing temperature transmitted from the transmitter 15 'of the temperature measuring instrument 10' A receiver 40 for wirelessly receiving, a calculation unit 40 for calculating the integration temperature and the early strength of the concrete based on the curing temperature of the concrete and the conditions set in the control unit 30 transmitted through the receiver, and the received temperature value and calculation unit It has an output unit 50 for outputting the integrated temperature and the early strength of the concrete calculated in (40), and a power supply unit 60 for supplying the driving power.

The configuration of the measuring base 20 is that the receiver is added in the above-described first embodiment, except that the concrete curing temperature is wirelessly received through the wireless receiving antenna of the receiver, and the integration temperature in the calculator 40. And the method for calculating the concrete early strength estimate value are the same as in the first embodiment described above. Accordingly, detailed description of the measurement base 20 will be omitted.

The concrete strength meter 1 ′ according to the second embodiment having such a configuration wirelessly receives the curing temperature of the concrete, which is wirelessly transmitted from the temperature measuring instrument 10 ′, in the measuring base 20 and calculates the calculation unit 40. Calculate the integrated temperature at and obtain the early strength of the concrete by using the integrated temperature and the constant value input from the input setting button 32 so that the operator can check through the output unit 50, the concrete structure in the distance It is very easy to calculate the integration temperature and early strength of concrete without directly accessing the concrete, and it is possible to quickly determine the time of demoulding in the mold such as formwork (3) at the point of optimum early concrete strength. Thus, by accurately confirming the strength of the structural concrete early and demolding the formwork at the earliest time, it is possible to prevent economic safety and durability of the structure due to the reduction of construction period as well as prevention of safety accidents in construction.

As such, the concrete strength measuring device according to the present invention can calculate the demoulding time, such as formwork at the time when the worker has the optimum early concrete strength without obtaining the curing temperature recording and integration temperature and concrete strength of the concrete. Accordingly, it is very easy and quick to ensure safety and quality control when constructing concrete structures.

1 is a simplified perspective view of a concrete strength meter according to a first embodiment of the present invention,

2 is a state diagram using the concrete strength meter of FIG.

3 is a block diagram of the concrete strength meter of FIG.

4 is a simplified perspective view of a concrete strength meter according to a second embodiment of the present invention,

5 is a state diagram using the concrete strength meter of FIG.

6 is a block diagram of the concrete strength meter of FIG. 4.

* Explanation of symbols for the main parts of the drawings

10: temperature sensor 20: measuring body

30: control panel 31: power button

32: Input setting button 33: Time setting button

35: print drive button 40: calculator

50: output unit 51: contract display

53: printer 60: power supply

Claims (7)

In concrete strength meter, A temperature sensor that measures the curing temperature of the concrete, An operation unit for setting a constant value for power-on-off and measuring condition and intensity conversion of the temperature sensor; A calculation unit for calculating an integrated temperature and early strength of the concrete based on a temperature value transmitted from the temperature sensor and a condition set in the operation unit; Concrete strength measuring device characterized in that it has an output unit for outputting the temperature value measured by the temperature sensor and the integrated temperature and early strength of the concrete calculated by the calculating unit. The method of claim 1, The operation unit has a time setting button for setting the temperature measurement time of the temperature sensor at predetermined time intervals and an input setting button for setting a constant value for intensity conversion, The calculation unit accumulates the curing temperature of the concrete delivered from the temperature sensor at a predetermined time interval set in the operation unit to calculate the integrated temperature, and the concrete strength measuring device, characterized in that to obtain the strength of the concrete based on the calculated integrated temperature. The method of claim 1, The output unit has a liquid crystal display which displays at least the temperature value measured by the temperature sensor in real time, and a printer which outputs the temperature value measured by the temperature sensor, the accumulated temperature and the early strength of the concrete as a data sheet. Measuring instrument. In concrete strength meter, A temperature sensor for measuring the curing temperature of the concrete, a transmission side control unit for setting a constant value for power on and off and the measurement conditions and strength conversion of the temperature sensor, and wireless transmission of the temperature value measured by the temperature sensor to the outside A temperature measuring device having a transmitter; A receiver for wirelessly receiving the temperature value transmitted from the transmitter, a calculator for calculating the integration temperature and the early strength of the concrete based on the curing temperature of the concrete and the set measurement conditions transmitted through the receiver, and the receiver Concrete strength measuring device, characterized in that it comprises a measuring body having an output unit for outputting the temperature value and the integrated temperature and early strength of the concrete calculated by the calculating unit. The method of claim 4, wherein A measurement base is provided with an operation unit for turning on and off the power of the measurement base and setting a measurement condition of a temperature sensor so as to be linked with the transmission side control unit; The transmission side control unit and the operation unit have a time setting button for setting a temperature measurement time of the temperature sensor at predetermined time intervals and an input setting button for setting a constant value for intensity conversion; The calculating unit accumulates the curing temperature of the concrete delivered to the receiving unit at predetermined time intervals set by the transmitting side control unit and the operation unit, calculates an integrated temperature, and obtains the early strength of the concrete based on the calculated integrated temperature. Concrete strength meter. The method of claim 4, wherein Output part A liquid crystal display which displays at least the temperature value received by the receiver in real time; And a printer for outputting the temperature value received from the receiving unit, the integration temperature, and the early strength of the concrete as a data sheet. The method of claim 4, wherein The temperature measuring instrument is a concrete strength meter, characterized in that the display unit for displaying the curing temperature of the concrete measured by the temperature sensor is provided.
KR1020080090229A 2008-09-12 2008-09-12 A solidity measuring instrument of concrete KR20100031237A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101486434B1 (en) * 2013-04-16 2015-01-26 한국건설기술연구원 Ultrasonic Test Apparatus for Determining Concrete Strength
WO2023101529A1 (en) * 2021-12-03 2023-06-08 김승범 Concrete temperature measurement apparatus and concrete curing management system using same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101486434B1 (en) * 2013-04-16 2015-01-26 한국건설기술연구원 Ultrasonic Test Apparatus for Determining Concrete Strength
WO2023101529A1 (en) * 2021-12-03 2023-06-08 김승범 Concrete temperature measurement apparatus and concrete curing management system using same

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