Method for measuring concrete setting time based on strain time on-line measuring

A technology of setting time and measurement method, applied in the field of civil engineering, can solve the problems of online measurement of difficult concrete and large difference of concrete setting time.

Inactive Publication Date: 2007-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Due to the existence of different definitions of concrete solidification in the above methods, the measured concrete solidification time is al

Method used

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  • Method for measuring concrete setting time based on strain time on-line measuring
  • Method for measuring concrete setting time based on strain time on-line measuring
  • Method for measuring concrete setting time based on strain time on-line measuring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embed JMZX-215AT embedded temperature strain gauges from Changsha Jinma High-Tech Co., Ltd. on the section numbered 2G of the Xijiang Bridge. The embedding position of the vibrating wire strain sensor and temperature sensor is 20cm deep from the concrete surface. The automatic data acquisition system also uses the company's JMZX-32 vibrating wire acquisition module, which can measure strain and temperature at the same time, and conduct online measurement of strain and temperature during the concrete solidification process, and the measurement time interval is 10 minutes / time. Figure 1 is a diagram of the temperature change during the concrete pouring process. As shown in the figure, it can be seen from the figure that the temperature measurement is reasonable. There is a jump in the temperature after the concrete is poured. This is because the initial temperature of the concrete is basically the water temperature. At the ambient temperature (winter night), as the hydrati...

Embodiment 2

[0060] For the measurement on the section numbered 3G of the Xijiang Bridge, the measurement method is the same as in Example 1. The measurement results are shown in Figure 4, from which we can see the characteristics shown in Example 1—after a certain period of time, the strain rate measured sinusoidally and the thermal expansion strain of concrete do begin to overlap, and the same can be obtained from their overlapping starting point. The setting time was 31.8 hours. Measuring equipment and process condition are with embodiment 1.

Embodiment 3

[0062] For the measurement on the section numbered 4G of the Xijiang Bridge, the measurement time interval is 30 minutes / time; other measurement methods are the same as in Embodiment 1. The measurement results are shown in Figure 5, and the measurement results have the same characteristics as in Example 1; the solidification time of the measured concrete is 29.2 hours. Measuring equipment and process condition are with embodiment 1.

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Abstract

A method for measuring setting time of concrete based on on-line measurement of strain temperature includes fixing transducers in concrete template to be measured in advance, setting parameters of said transducers before concrete is poured and carrying out on-line measurement automatically on strain and temperature in solidifying course of concrete to obtain variation curve of general strain to time and variation curve of temperature to time, using the first coincided time point of two said curves as the solidified time of concrete.

Description

technical field [0001] The invention relates to civil engineering, in particular to a measurement method for on-line measuring the solidification of cement concrete after pouring or judging whether the concrete is solidified based on the strain temperature. Background technique [0002] Cement concrete has been widely used in civil engineering. Concrete monitors the solidification process of concrete or determines the solidification time of concrete. It is useful for understanding various properties of concrete such as tensile, compressive and shear strength, anti-leakage, and elastic properties. Accurate measurement Concrete shrinkage and creep, it is very important to determine whether the concrete can bear the load. It is of great significance especially for the engineering construction control of large concrete structures (bridges, etc.). Shrinkage and deformation, so it is very difficult to make an accurate analysis of the loading of the concrete structure to determine...

Claims

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Application Information

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IPC IPC(8): G01N33/38
Inventor 汤立群何庭蕙刘逸平刘泽佳黄小清梁颖晶劳晓春
Owner SOUTH CHINA UNIV OF TECH
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