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A Method for Evaluating the Early Freezing Performance of Concrete Using Transient Temperature Field Analysis

A transient temperature field, analysis and evaluation technology, applied in design optimization/simulation and other directions, 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, and achieve fast and reliable acquisition methods. Guaranteed construction quality and low operational difficulty

Active Publication Date: 2022-05-06
HARBIN INST OF TECH
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  • 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 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

Method used

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  • A Method for Evaluating the Early Freezing Performance of Concrete Using Transient Temperature Field Analysis
  • A Method for Evaluating the Early Freezing Performance of Concrete Using Transient Temperature Field Analysis
  • A Method for Evaluating the Early Freezing Performance of Concrete Using Transient Temperature Field Analysis

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specific Embodiment approach 1

[0044] Specific implementation mode one: combine figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 To illustrate this embodiment, select two adjacent typical areas in the same part of the winter concrete project 1, and name them respectively as concrete area I and concrete area II, and obtain the temperature from the concrete area I to the positive temperature and ice-free state through heat conservation calculation. The rise time Δt, according to the calculated temperature rise time Δt, the concrete area I is heated, and the penetration resistance test is performed on the heated concrete area I and the unheated concrete area II respectively, and the penetration depth is compared to evaluate Early freezing performance of concrete.

[0045] Further, when the concrete project 1 is poured, the temperature sensor 2 is embedded in the area other than the concrete area I and the concrete area II as a tempe...

specific Embodiment approach 2

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

[0056] Further, when the concrete project 1 is poured, the temperature sensor 2 is embedded in the area outside the concrete area I and the...

specific Embodiment approach 3

[0066] Specific implementation mode three: combination figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 Describe this embodiment, present embodiment comprises following three steps, the pre-embedding of temperature sensor 2, calculate the temperature rise time of heated concrete in the concrete area 1 and the mensuration of penetration depth:

[0067] Step 1: pre-embedding of temperature sensor 2;

[0068] For the same concrete project 1 in the same curing environment, even if the concrete project 1 of different ages is tested, only one point can be selected as the temperature measuring point, and it should be embedded at a depth of 40mm on the surface of the concrete project 1 during pouring 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 molded to a certain age and needs to be tested ...

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Abstract

A method for evaluating the early freezing performance of concrete by using transient temperature field analysis. During winter construction, the mechanical properties of concrete are reduced due to the influence of low temperature, especially the negative temperature is affected by freezing ice. Because the freezing brings additional strength to concrete, it is difficult to quickly and correctly grasp the mechanical properties of concrete under negative temperature environment in winter construction. As a result, it is difficult to guarantee the construction quality control, and the probability of hidden dangers in the project quality is greatly increased. The present invention selects the adjacent concrete area I and concrete area II in the concrete engineering, and obtains the temperature rise time Δt from the concrete area I to the ice-free state through computer simulation calculation, and heats the concrete area I according to the temperature rise time Δt. The penetration depth test was performed on the heated concrete area I and the unheated concrete area II respectively, and the early freezing performance of concrete was evaluated by comparing the penetration depth. The invention is used for evaluating the freezing performance of concrete.

Description

technical field [0001] The invention belongs to the field of concrete detection, and in particular relates to a method for analyzing and evaluating the early freezing performance of concrete by using a transient temperature field. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
Inventor 杨英姿桑源郭浔刘雨时陈智韬
Owner HARBIN INST OF TECH
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