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Method for evaluating early-stage anti-freezing performance of concrete by drawing

A concrete and drawing type technology, which is applied to measuring devices, instruments, and mechanical devices, can solve the problems of poor quality of construction projects in winter, and it is difficult to timely and accurately evaluate the early freezing damage of negative temperature concrete, so as to ensure the construction quality, The calculation method is scientific and reasonable, and the method is flexible and a variety of effects

Active Publication Date: 2019-04-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 pulling force, 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

Method used

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  • Method for evaluating early-stage anti-freezing performance of concrete by drawing
  • Method for evaluating early-stage anti-freezing performance of concrete by drawing
  • Method for evaluating early-stage anti-freezing performance of concrete by drawing

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specific Embodiment approach 1

[0045] Specific implementation mode one: combine figure 1 , figure 2 , image 3 and Figure 4 To illustrate this embodiment, select the adjacent concrete area I and concrete area II in concrete engineering 1, obtain the temperature rise time Δt from the concrete area I to the ice-free state, and heat the concrete area I according to the temperature rise time Δt, and the heating Pull-out tests were performed on the final concrete area I and unheated concrete area II, and the early freezing performance of concrete was evaluated by comparing the pull-out force values.

[0046] Further, when the concrete project 1 is poured, a plurality of first anchor rods 4 are pre-embedded in the concrete area I, and a plurality of second anchor rods are pre-embedded in the concrete area II, and in areas other than the concrete area I and the concrete area II The embedded temperature sensor 2 is used as the temperature measuring point, and the temperature sensor 2 is connected with the temp...

specific Embodiment approach 2

[0067] Specific implementation mode two: combination figure 1 , figure 2 , image 3 and Figure 4 To describe this embodiment, the heating power of the constant power heating device 5 is 90W. Since the concrete cannot fully absorb the energy provided by the constant power heating device 5 during actual operation, and considering the heat transfer process from the heated area to the surroundings, the heating power needs to be corrected with a correction coefficient according to the temperature of the concrete when it is heated. The acquisition of the correction coefficient needs to be obtained through pre-experiment.

[0068] The negative temperature is divided into intervals, and the correction coefficient is taken for each temperature interval, and the number of temperature intervals required for the pre-experiment is reasonably determined according to the multi-year winter minimum temperature data at the location of the concrete project 1. Starting from 0°C, each temper...

specific Embodiment approach 3

[0086] Specific embodiment three: this embodiment is a further limitation of specific embodiment one or two. When concrete engineering 1 is poured, the temperature sensor 2 is pre-embedded in the area other than the concrete area I and the concrete area II as a temperature measuring point, and the temperature sensor 2 and The temperature recorder 3 is connected to record the concrete temperature Ti and the corresponding time at this temperature as Δd i . The temperature Ti and the corresponding time at this temperature is Δd i It is determined according to the age requirement of evaluating concrete engineering 1. For example, to evaluate the freezing performance of concrete engineering 1 within 7 days, you can measure and obtain the temperature Ti within 7 days and the corresponding time at this temperature is Δd i .

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Abstract

The invention relates to a method for evaluating the early-stage anti-freezing performance of concrete by drawing. The mechanical performance of concrete tends to decrease in winter construction due to influence of low temperature, especially, the concrete is frozen at subzero temperature; and freezing brings about additional intensity of the concrete, so that the mechanical performance of the concrete in the subzero temperature environment in winter construction is hard to master accurately, the progress of winter construction is influenced, the construction quality control is hard to ensure,intensity development of onsite concrete cannot be fed back accurately and timely, and further, it is more possible that there is risk in projects. A first concrete area and a second concrete area adjacent to the first concrete area are selected in a concrete project, temperature rise time Deltat for reaching a non-ice state of the first concrete area is obtained, the first concrete area is heated according to the temperature rise time Deltat, drawing test is carried out on the heated first concrete area and the unheated second concrete area, and the drawing force values are compared to evaluate the early-stage anti-freezing performance of the concrete. Thus, the anti-freezing performance of the concrete is evaluated.

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 drawing force. Background technique [0002] In my country, most areas such as Northeast, Northwest and North China have long and severe winters. The low temperature weather in winter will cause certain damage to concrete engineering, especially the concrete constructed in winter, the hydration rate is slowed down and it is extremely susceptible to freezing ice. After freezing, the porosity of concrete increases, the density decreases, the freezing pressure destroys the structure of hydration products, and the mechanical properties of concrete decrease significantly. Because the concrete surface is in direct contact with the negative temperature environment, the surface concrete cools down the fastest, and the temperature of the concrete decreases gradually from the outer layer to the inner layer....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 杨英姿桑源赵祺
Owner HARBIN INST OF TECH
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