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A Method for Evaluating the Early Freeze Performance of Concrete Using Shock Elastic Waves

An impact elasticity, concrete technology, applied in the generation of ultrasonic/sonic/infrasonic waves, the use of sonic/ultrasonic/infrasonic waves to analyze solids, the application of thermometers, etc. Influence of construction progress and other issues to ensure completeness, wide application range and convenient operation

Active Publication Date: 2021-01-26
HARBIN INST OF TECH
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  • Summary
  • 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 using the multifunctional non-destructive testing instrument for concrete, so as to solve the problem that it is difficult to correctly grasp the mechanical properties of concrete due to the freezing of concrete in winter construction, which leads to the progress of winter construction. Affected, construction quality control is difficult to guarantee

Method used

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  • A Method for Evaluating the Early Freeze Performance of Concrete Using Shock Elastic Waves
  • A Method for Evaluating the Early Freeze Performance of Concrete Using Shock Elastic Waves

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Experimental program
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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 Describe this implementation mode, including:

[0028] Determine the concrete project 1 to be evaluated, pre-embed the temperature sensor 2 in the concrete project 1 to collect temperature data, determine the test age, and establish a standard maintenance condition according to the test age, use the excitation device and the acceleration sensor 5 to complete the shock elasticity The relationship curve between wave longitudinal wave velocity and maturity, the test age is a certain period of time, specifically refers to a period of time after the concrete project 1 is poured and formed, it can be set according to specific needs, usually the time period setting range is selected in Within one month after the curing of concrete project 1, that is, the early-age stage of concrete, when the concrete in concrete project 1 is cured to the test age, the degree of frost damage and maturity calculation are carried out at the same ...

specific Embodiment approach 2

[0045] Specific implementation mode two: combination figure 1 Describe this implementation mode, this implementation mode comprises the following four steps:

[0046] Step 1: First of all, for winter construction or concrete project 1 in cold areas, pre-embed the temperature sensor 2 during concrete construction, and connect the temperature recorder 3 to record the internal temperature of the concrete in real time and determine the test age.

[0047] Step 2: Next, under standard curing conditions, the concrete with the same mix ratio is used to establish the relationship curve between longitudinal wave velocity and maturity of concrete according to the test age.

[0048] Step 3: Select the test area in the concrete project 1. When the degree of frost damage of the concrete needs to be tested after curing to the test age, the longitudinal wave velocity test can be carried out on the concrete surface with a concrete multifunctional non-destructive testing instrument to obtain th...

specific Embodiment approach 3

[0052] Embodiment 3: This embodiment is a further limitation of Embodiment 1 or 2. When the concrete test block under standard maintenance is tested for longitudinal wave velocity, the longitudinal wave velocity test is performed every 6 hours after the first day of forming. On the 2nd and 3rd day after molding, the longitudinal wave velocity test is carried out every 12 hours. From the 4th day to the 28th day after molding, the longitudinal wave velocity test is carried out every 24 hours.

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Abstract

A method for evaluating the early freezing performance of concrete using shock elastic waves. It is difficult to correctly grasp the mechanical properties of the concrete constructed in winter due to the low temperature and freezing, which makes it difficult to guarantee the construction quality control. Most of the existing evaluation methods need to cause different degrees of trauma to the concrete project, thereby affecting the concrete project. The present invention first establishes the relationship curve between elastic wave longitudinal wave velocity and maturity, and pre-embeds a temperature sensor in the concrete project. The damage degree detection obtains the actual longitudinal wave velocity of the shock elastic wave, and calculates the corresponding maturity of the concrete project within the test age according to the temperature data provided by the temperature tester, and compares the calculated maturity with the relation curve between the longitudinal wave velocity of the shock elastic wave of concrete and the maturity , to obtain the longitudinal wave velocity corresponding to the maturity value, and compare the two shock elastic wave longitudinal wave velocities before evaluating.

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. Background technique [0002] Concrete is the most widely used building material in civil engineering. It plays an absolute role in the safety, reliability and durability of structures. The research and control of concrete quality is particularly important. When the average day and night temperature of the construction site is lower than 5°C for 3 consecutive days or the lowest temperature is lower than -3°C for concrete work, it is called winter construction of concrete. And the average of outdoor air temperature at 21:00. In winter, when the temperature is low, many building materials freeze into ice due to moisture content and become brittle, which brings many difficulties to building construction. Therefore, for the concrete constructed in winter, the interior contains moisture, and the low tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/34G01K13/00
Inventor 杨英姿赵祺桑源高金麟
Owner HARBIN INST OF TECH
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