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Method for evaluating early-stage freezing resistance of concrete through maturity

A concrete and maturity technology, applied in flow characteristics, measuring devices, instruments, etc., can solve the problems of difficulty in correctly grasping the mechanical properties of concrete, the influence of winter construction progress, and difficulty in ensuring construction quality control, etc., to achieve a wide range of applications and simple steps , flexible operation

Active Publication Date: 2019-03-22
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 this invention is to provide a method for evaluating the early freezing performance of concrete by penetration depth, so as to solve the problem that due to the freezing of concrete in winter construction, it is difficult to correctly grasp the mechanical properties of concrete, which will affect the construction progress in winter and make it difficult to ensure construction quality control The problem

Method used

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  • Method for evaluating early-stage freezing resistance of concrete through maturity

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specific Embodiment approach 1

[0024] Specific implementation mode one: combine figure 1 Describe this implementation mode, including:

[0025] Determine the concrete project to be evaluated, pre-embed the temperature sensor in the concrete project to collect temperature data, determine the test age and establish the relationship curve between the penetration depth and maturity of the concrete under standard curing conditions according to the test age, and the test age is a certain time The period, specifically refers to a period of time after the pouring of the concrete project. It can be set according to specific needs. Usually, the time period setting range is selected within one month after the concrete project is formed, that is, the early stage of concrete. When the concrete When the concrete in the project is cured to the test age, the frost damage degree detection and maturity calculation are carried out at the same time. The actual penetration depth is obtained through the frost damage degree detec...

specific Embodiment approach 2

[0037] Specific implementation mode two: combination figure 1 Describe this embodiment, this embodiment includes following four steps,

[0038] Step 1: First, for winter construction or concrete projects in cold areas, pre-embed a temperature sensor during concrete construction and connect a temperature recorder to record the internal temperature of the concrete in real time and determine the test age.

[0039] Step 2: Next, under standard curing conditions, according to the test age, establish the relationship curve between concrete penetration depth and maturity.

[0040]Step 3: When the concrete is cured to the test age and it is necessary to detect the degree of concrete frost damage, the penetrometer can be used to inject steel nails on the concrete surface to measure the penetration depth, and obtain the penetration of the on-site concrete project under the test age Depth, and calculate the maturity corresponding to this age according to the development of the temperatu...

specific Embodiment approach 3

[0044] Specific embodiment 3: This embodiment is a further limitation of specific embodiment 1 or 2. When the concrete test block under standard maintenance is tested for penetration depth, it is penetrated every 2 hours from demoulding to the first day of forming. depth test. On the 2nd and 3rd day after molding, a penetration depth test is performed every 12 hours. From the 4th day to the 28th day after molding, a penetration depth test is performed every 24 hours.

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Abstract

The invention discloses a method for evaluating early-stage freezing resistance of concrete through maturity. As concrete constructed in winter can be iced, it is hard to master the mechanical properties of the concrete correctly, the problems that the construction progress in winter is affected, and the construction quality control is unlikely to ensure can be caused. The method comprises the following steps: establishing a concrete injection depth and maturity relationship curve, preburying a temperature tester in a concrete engineering field, acquiring temperature data, carrying out freezing damage degree detection at a testing age, acquiring an actual injection depth, calculating corresponding maturity within the age of the concrete engineering according to temperature development, comparing the calculated maturity with the concrete injection depth and maturity relationship curve, acquiring a standard curing injection depth, comparing the standard curing injection depth with the actual injection depth, and evaluating early-stage freezing resistance of concrete. The method is applied to evaluation of concrete constructed in winter.

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 penetration depth. Background technique [0002] The construction process when the daily average outdoor temperature is stable below 5°C for 5 consecutive days is called winter construction. The temperature drops in winter, and the temperature in many areas is below 0°C. The moisture contained in soil, concrete, mortar, etc. freezes, and building materials are prone to brittle cracks, which brings many difficulties to construction. Especially for concrete constructed in winter, the mechanical properties of concrete are reduced due to the influence of low temperature, especially the negative temperature is affected by freezing and ice, because the freezing brings additional strength to the concrete, it is difficult to correctly grasp the mechanical properties of concrete under negative temperature e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38G01N11/12
CPCG01N11/12G01N33/383
Inventor 杨英姿桑源刘雨时陈智韬
Owner HARBIN INST OF TECH
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