A method for analyzing and evaluating early freezing performance of concrete by utilizing a transient temperature field

A transient temperature field, analysis and evaluation technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of difficulty in timely and accurate evaluation of early freezing damage of negative temperature concrete, poor quality of construction projects in winter, etc. To achieve the effect of fast and reliable acquisition method, guaranteed construction quality, and low operation difficulty

Active Publication Date: 2019-05-10
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for evaluating the early freezing performance of concrete by penetration depth, so as to solve the problem that it is difficult to timely and accurately evaluate the early freezing performance of negative temperature concrete due to the freezing of concrete during winter construction and the freezing damage of surface concrete is greater than that of internal concrete. Frost damage, resulting in poor quality of winter construction projects

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  • A method for analyzing and evaluating early freezing performance of concrete by utilizing a transient temperature field
  • A method for analyzing and evaluating early freezing performance of concrete by utilizing a transient temperature field
  • A method for analyzing and evaluating early freezing performance of concrete by utilizing a transient temperature field

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specific Embodiment approach 1

[0044] Specific implementation mode 1: Combination figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 , Picture 9 with Picture 10 To explain this embodiment, two adjacent typical areas are selected in the same part of the winter concrete project 1, and they are named concrete area I and concrete area II. The temperature of concrete area I to the positive temperature and ice-free state is obtained through heat conservation calculation. Rise time Δt, heat the concrete area I according to the calculated temperature rise time Δt, use the penetration resistance meter to test the penetration depth of the heated concrete area I and the unheated concrete area II respectively, and evaluate through the penetration depth comparison Early freezing performance of concrete.

[0045] Furthermore, when the concrete project 1 is poured, the temperature sensor 2 is embedded as a temperature measuring point in areas other than the concrete area I and the con...

specific Embodiment approach 2

[0055] Specific implementation manner two: combination figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 , Picture 9 with Picture 10 To illustrate this embodiment, this embodiment includes selecting concrete area I and concrete area II in concrete project 1, obtaining the temperature rise time Δt from concrete area II to the ice-free state, and heating the concrete area II according to the temperature rise time Δt, The concrete area I and the heated concrete area II were tested for penetration depth respectively, and the early freezing performance of concrete was evaluated by comparing the penetration depth. Concrete project 1 refers to concrete project 1 under construction in winter. Concrete area I is concrete under negative temperature, and concrete area II is concrete that needs to be heated.

[0056] Furthermore, when the concrete project 1 is poured, the temperature sensor 2 is embedded as a temperature measuring point in the area o...

specific Embodiment approach 3

[0066] Specific implementation mode three: combination figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 , Picture 9 with Picture 10 To illustrate this embodiment, this embodiment includes the following three steps: embedding the temperature sensor 2 and calculating the temperature rise time of the heated concrete in the concrete area I and the measurement of the penetration depth:

[0067] Step 1: Embedded temperature sensor 2;

[0068] For the same concrete project 1 in the same curing environment, even if the concrete projects 1 of different ages are tested, only one point can be selected as the temperature measurement point. When the concrete is poured, the concrete project 1 is embedded at a depth of 40mm The temperature sensor 2 is connected to the temperature recorder 3 to record the temperature change of the concrete project 1 in real time. When the concrete is formed to a certain age and needs to be tested for frost damage and the...

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Abstract

The invention discloses a method for analyzing and evaluating early freezing performance of concrete by utilizing a transient temperature field. The mechanical property of the concrete is reduced dueto the influence of low temperature in winter construction; particularly, due to the fact that freezing brings additional strength to concrete, it is difficult to quickly and correctly master the mechanical property of the concrete in the winter construction negative-temperature environment, construction quality control is difficult to guarantee, and the probability that potential hazards exist inengineering quality is greatly increased. The method comprises the following steps: selecting a concrete area I and a concrete area II which are adjacent in a concrete project; the temperature rise time t from the concrete area I to the ice-free state is obtained through computer simulation calculation; and heating the concrete area I according to the temperature rise time t, respectively carrying out penetration depth testing on the heated concrete area I and the unheated concrete area II, and evaluating the early freezing performance of the concrete through penetration depth comparison. Themethod is used for evaluating the frozen performance of the concrete.

Description

Technical field [0001] The invention belongs to the field of concrete detection, and in particular relates to a method for evaluating the early freezing performance of concrete by using transient temperature field analysis. Background technique [0002] In my country, the winter period is long and severely cold in most areas such as northeast, northwest, northwest and north China. The low-temperature weather in winter will cause certain damage to concrete works, especially the concrete constructed in winter, the hydration rate will slow down and it is extremely vulnerable to freezing and ice. The porosity of the concrete after being frozen by ice increases, the compactness decreases, the freezing pressure destroys the structure of hydration products, and the mechanical properties of concrete decrease significantly. Because the surface of the concrete is in direct contact with the negative temperature environment, the surface concrete will cool down the fastest. The temperature o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨英姿桑源郭浔刘雨时陈智韬
Owner HARBIN INST OF TECH
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