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A Method for Evaluating the Early Freeze Performance of Concrete Using Maturity

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

Active Publication Date: 2021-07-23
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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  • A Method for Evaluating the Early Freeze Performance of Concrete Using Maturity
  • A Method for Evaluating the Early Freeze Performance of Concrete Using Maturity

Examples

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specific Embodiment approach 1

[0024] Embodiment 1: Combining 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 detection, and the corr...

specific Embodiment approach 2

[0037] Specific implementation mode 2: Combining 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 temperature o...

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

A method to evaluate the early freezing performance of concrete by maturity. Due to the freezing of concrete in winter construction, it is difficult to correctly grasp the mechanical properties of concrete, which affects the construction progress in winter and makes it difficult to guarantee the construction quality control. In order to establish the relationship curve between the penetration depth and maturity of concrete, the present invention collects temperature data by pre-embedding a temperature testing instrument at the concrete engineering site, detects the degree of frost damage when the test age is reached, obtains the actual penetration depth, and calculates it according to the development of temperature For the corresponding maturity of the concrete project in this age period, compare the calculated maturity with the concrete penetration depth and maturity relationship curve to obtain the standard curing penetration depth, and compare the standard curing penetration depth and the actual penetration depth. Evaluate the early freezing performance of concrete. The invention is used to evaluate concrete for winter construction.

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 Patents(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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