Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A penetrating method for evaluating the early freezing performance of concrete

A concrete and penetration technology, applied in the directions of flow characteristics, instruments, measuring devices, etc., can solve the problems of difficulty in timely and accurate evaluation of early freezing damage of negative temperature concrete and poor quality of construction projects in winter, so as to avoid blindness and ensure construction. The effect of quality, simple operation

Active Publication Date: 2021-04-27
HARBIN INST OF TECH
View PDF8 Cites 0 Cited by
  • 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 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A penetrating method for evaluating the early freezing performance of concrete
  • A penetrating method for evaluating the early freezing performance of concrete
  • A penetrating method for evaluating the early freezing performance of concrete

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0049] 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.

[0050] 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

[0075] 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.

[0076] Further, when the concrete project 1 is poured, the temperature sensor 2 is embedded in the area other than the concrete area I and ...

specific Embodiment approach 3

[0101] 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:

[0102] Step 1: pre-embedding of temperature sensor 2;

[0103] 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.

[0104] Step 2: Calculate the concrete temperature rise time:

[0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific heat capacityaaaaaaaaaa
specific heat capacityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

A penetrating method for evaluating the early freezing performance of concrete. 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, which brings additional strength to concrete due to freezing, and it is difficult to correctly grasp the mechanical properties of concrete under negative temperature environment in winter construction, resulting in winter construction. The construction progress is affected, and the construction quality control is difficult to guarantee. The inability to provide timely and accurate feedback on the development of concrete strength on site will greatly increase the probability of hidden dangers in project quality. The present invention selects the adjacent concrete area I and concrete area II in the concrete engineering, calculates and obtains the temperature rise time Δt from the concrete area I to the ice-free state through formula derivation, and heats the concrete area I according to the temperature rise time Δt. Afterwards, the penetration depth test was carried out on the concrete area I and the concrete area II respectively, and the early freezing performance of the 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 evaluating the early freezing performance of concrete by penetration depth. 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 la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38G01N11/12
CPCG01N11/12G01N33/383
Inventor 杨英姿桑源赵祺吕承博
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com